Flowline jumper

Abstract

A method of installing a flowline jumper between a first hub and a second hub of a subsea system includes suspending the flowline jumper from a spreader structure comprising a longitudinal spreader bar and at least one transversal spreader bar. The spreader structure and suspended flowline jumper are lowered to a subsea location. The first end connector is aligned with the first hub and the second end connector is aligned with the second hub. Alignment includes installing one or more adjustable riggings between the transversal spreader bar(s) and end connector(s) and lengthening or shortening the adjustable rigging(s).

Description

FLOWLINE JUMPERFIELD OF INVENTION

[0001] The present disclosure relates to a method of installing a flowline jumper and a flowline jumper handling arrangement.BACKGROUND

[0002] Flowline jumpers are used in the field of subsea oil and gas production to provide fluid communication between two hubs of a subsea system. For example, a flowline jumper may be used to connect the production outlet of a Christmas tree to a manifold. Thus, a flowline jumper usually comprises a length of conduit and two fluid couplings, referred to as end connectors in this disclosure, one located at each end of the conduit, which are adapted to mate with corresponding hubs connected to subsea equipment of the subsea system. To facilitate installing the flowline jumper from a surface vessel, the hubs connected to the subsea equipment are typically oriented vertically upward and the flowline jumper is constructed so that the conduit and the end connectors lie in a single plane, and so that the end connectors are oriented in the same direction as one another and as the hubs. In this manner, the flowline jumper may be lowered vertically from the surface vessel and the fluid couplings on the subsea jumper are landed on the hubs.

[0003] Flowline jumpers are typically designed to fit the expected arrangement of the hubs subsea.However, in reality, the relative positioning and orientation of the hubs may differ from what is expected, e.g. due to installation tolerances. When a flowline jumper is designed for one arrangement, and the actual arrangement differs, it can be difficult to connect the flowline jumper to the hubs. Also, over time the relative position and orientation of the hubs may shift. This may be for any number of reasons, such as the seafloor topography changing or equipment of the subsea system settling. Consequently, when a flowline jumper is to be substituted for a new one, time consuming metrology may be required to establish the current position and / or orientation of the hubs prior to the new flowline jumper being lowered to the subsea system.

[0004] There have been various attempts to provide ways to ensure that flowline jumpers better fit the hubs they are designed to connect to. For example, US 2023 / 0002200 Al describes a modular spreader structure, by which different lengths of tubing can be joined together to make a spreader structure that is suitable for stably deploying the flowline jumper. US 2006 / 0201679 Al discloses ahydraulically adjustable support member that can be positioned between parts of the jumper to displace the end connectors relative to one another. US 2015 / 0275629 Al presents an apparatus with an adjusting assembly configured to adjust a relative separation of two end connectors.

[0005] While providing improved lifting frames or the ability to displace the end connectors relative to one another may provide some benefits in manipulating flowline jumpers, the capabilities are limited and an improved solution is desired.SUMMARY

[0006] According to a first aspect, there is provided a method of installing a flowline jumper between a first hub and a second hub of a subsea system, the flowline jumper comprising a first end connector, a second end connector and a jumper conduit fluidly interconnecting the first and second end connectors. The method comprises the steps of: (a) at a surface location, suspending the flowline jumper from a spreader structure comprising a longitudinal spreader bar extending along a longitudinal axis and at least one transversal spreader bar connected to the longitudinal spreader bar and extending from the longitudinal spreader bar in a direction deviating from the longitudinal axis; (b) lowering the spreader structure and the suspended flowline jumper to a subsea location of the subsea system; (c) aligning the first end connector with the first hub; (d) aligning the second end connector with the second hub; wherein at least one of steps (c) and (d) comprise at least one of the sub-steps of: (i) installing a first adjustable rigging between the at least one transversal spreader bar and the first end connector and lengthening or shortening the first adjustable rigging; and (ii) installing a second adjustable rigging between the at least one transversal spreader bar and the second end connector and lengthening or shortening the second adjustable rigging.

[0007] Lengthening or shortening the first and / or second adjustable rigging(s) can be used to shift the axial orientation of the end connector(s), thus allowing the end connector(s) to be aligned with the hub(s) in situ, i.e. at the subsea location. This is advantageous should the end connectors be found to be misaligned during the landing of the end connectors on the hubs. Consequently, the adjustable riggings reduce the accuracy by which the position and orientation of each hub need to be established during the planning phase of the installation operation since an unknown position and / or orientation of a hub can be compensated for during the installation using the adjustable rigging(s).

[0008] The ability to manipulate the alignment of the end connectors at the subsea location is especially advantageous in brown fields. When substituting flowline jumpers in brown fields, it is notuncommon that the position and / or orientation of the hubs have shifted from the positions and / or orientations in which they were installed originally. Thus, prior art methods of substituting flowline jumpers in brown fields normally requires a costly and time-consuming step of establish the present, exact position and orientation of the hubs prior to lowering the substitute flowline jumper to the seafloor. However, having the ability to manipulate the alignment of the end connectors at the seafloor location reduces the need of exact hub metrology and may even make such metrology redundant altogether.

[0009] The adjustable riggings may be installed to the spreader structure at the seafloor location, at which point in time the nature of any misalignment between the end connectors and the hubs will be more apparent. Less advantageous, the adjustable riggings could be installed to the spreader structure already at the surface location.

[0010] The adjustable riggings may be installed between one or more attachment points on the transversal spreader bar(s) and one or more attachment points on the appropriate end connector. An attachment point on the transversal spreader bar(s) may be positioned a distance along the transversal spreader bar(s) from the longitudinal spreader bar / the longitudinal axis. Accordingly, the adjustable rigging may connect to the end connector in a direction outside a plane in which the flowline jumper lies, allowing the end connector to be manipulated by the adjustable rigging out of said plane.

[0011] It may be advantageous to provide the spreader structure with a plurality of transversal spreader bars and / or to provide each transversal spreader bar with a plurality of attachment points for the adjustable riggings such that the transversal spreader bar and the attachment point(s) providing the most suitable rigging setup can be chosen to correct the misalignment between the end connector(s) and the hub(s). The manipulation of the flowline jumper to fit to the subsea system and / or the most suitable rigging setup may be determined computationally.

[0012] The subsea location may be a sea floor location, e.g. at the sea floor, e.g. on or above the sea floor. The subsea system may comprise a manifold, a hydrocarbon tree, such as a Christmas tree, or another piece of subsea equipment, and the first hub and the second hub may be connection points on the subsea system. The surface location may be on a platform floating on or above the sea, on a vessel, or at another location that is above the surface of the sea. The spreader structure may be suspended from a crane at the surface location, and the crane may lower the spreader structure.

[0013] The flowline jumper may be suspended from the spreader structure by the adjustable riggings and / or by static riggings. Static riggings may also be referred to or considered to be non-adjustable riggings, and may comprise chains, ropes, or slings. The adjustable riggings may comprise apparatus or devices comprising chains, ropes, slings whose length can be adjusted. For example, the adjustable riggings may comprise a chain hoist.

[0014] Aligning an end connector with a hub may comprise positioning the end connector over or in line with the hub. The end connector may be aligned with an axis along which the hub sits. Aligning the first end connector with the first hub may be performed by moving crane at surface location or by moving the end connector, and therefore the flowline jumper, with a remotely operated vehicle (ROV) or diver. Lengthening or shortening may be performed by ROV or diver.

[0015] The transversal spreader bar(s) may be symmetrically arranged about the longitudinal spreader bar and the longitudinal axis, or may be asymmetrically arranged about the longitudinal spreader bar and the longitudinal axis. The transversal spreader bar(s) may extend from the longitudinal spreader bar to one side or both sides of the longitudinal spreader bar. The transversal spreader bar(s) may extend along a transversal axis that is angled relative to the longitudinal axis.

[0016] As previously stated, sub-steps (i) and (ii) comprise installation of an adjustable rigging between the at least one transversal spreader bar and the first end connector, and between the at least one transversal spreader bar and the second end connector, respectively. The adjustable rigging may be installed to the spreader structure at a length appropriate to enable ease of installation. Furthermore, the different parts of sub-steps (i) and (ii) may be performed at different points of the process. Particularly, the installation of the adjustable rigging(s) may be performed prior to step (a), prior to the flowline jumper being suspended from the spreader structure, or after step (b), i.e. after the spreader structure and the suspended flowline jumper have been lowered to the subsea location.

[0017] Said at least one transversal spreader bar may comprise a first transversal spreader bar and a second transversal spreader bar. At least one of said steps (c) and (d) may comprise at least one of the sub-steps of: (i1) installing the first adjustable rigging between the first transversal spreader bar and the first end connector and lengthening or shortening the first adjustable rigging; and (ii1) installing the second adjustable rigging between the second transversal spreader bar and the second end connector and lengthening or shortening the second adjustable rigging. Sub-step (i1) may correspond to sub-step (i), and may be performed as sub-step (i). Similarly, sub-step (ii1) may correspond to sub-step (ii), and may be performed as sub-step (ii).

[0018] The first and second transversal spreader bars may be arranged at distal ends of the longitudinal spreader bar and intersect the longitudinal spreader bar orthogonally or substantially orthogonally. However, the transversal spreader bar(s) may in principle extend from the longitudinal spreader bar in any direction deviating from the longitudinal axis of the longitudinal spreader bar to provide attachment points for the adjustable riggings located away from the longitudinal axis. In the transversal spreader bar(s), attachment points for the adjustable riggings may be arranged at distal ends of the transversal spreader bar(s). Furthermore, the transversal spreader bar(s) may extend from any point on the longitudinal spreader bar. The first and second transversal spreader bars may be arranged along the longitudinal spreader bar such that there is a first distance between them. The first distance may be substantially equal to the length of the flowline jumper or to the length of the longitudinal spreader bar. The first distance may be greater than the length of the flowline jumper. The first and second transversal spreader bars may be arranged to extend from the longitudinal spreader bar at a position that is vertically or substantially vertically above the corresponding end connector, in use.

[0019] The longitudinal spreader bar and the transversal spreader bar(s) may be arranged in a common plane, and when the spreader structure is in use this common plane may be horizontally or substantially horizontally oriented.

[0020] At least one of steps (c) and (d) may comprise the sub-step of: (iii) installing a third adjustable rigging between the longitudinal spreader bar and the jumper conduit and lengthening or shortening the third adjustable rigging. Installing a third adjustable rigging provides additional flexibility to manipulate the end connectors to shift the axial orientation of the first and / or second end connector to align them to the hubs. Sub-step (iii) may be performed in addition to at least one of substeps (i) and (ii).

[0021] The third adjustable rigging may be installed between the longitudinal spreader bar and an intermediate jumper section of the jumper conduit that fluidly interconnects a first goose-neck section of the jumper conduit and a second goose-neck section of the jumper conduit.

[0022] The third adjustable rigging may be installed at a position that is midway or substantially midway between first and second adjustable rigging. The third adjustable rigging may be installed at a mid-point of the longitudinal spreader bar.

[0023] At least one of step (c) and (d) may further comprise at least one of the sub-steps of: (iv) installing a first push / pull ram between vertical jumper sections of a first goose-neck section of thejumper conduit associated with the first end connector and lengthening or shortening the first push / pull ram; and (v) installing a second push / pull ram between vertical jumper sections of a second goose-neck section of the jumper conduit associated with the second end connector and lengthening or shortening the second push / pull ram. Installing first and second push / pull rams provides yet additional flexibility to manipulate the end connectors to shift their respective axial orientation to align them to the hubs. At least one of sub-steps (iv) and (v) may be performed in addition to at least one of the sub-steps (i) and (ii), and optional sub-step (iii).

[0024] At least one of the sub-steps (i) to (v), (i1), and (ii1) may comprise lengthening or shortening the adjustable rigging(s) and / or the push / pull ram(s) using one or a plurality of remotely-operated vehicles (ROVs). The ROV are subsea ROVs in these examples. An ROV may perform the lengthening or shortening at or close to the subsea location. The adjustable rigging(s) and push / pull ram(s) may have adjustment mechanisms for the ROVs to interface with to enable said lengthening or shortening. Each adjustment may be performed by a different ROV, or each ROV may perform a plurality of different lengthenings or shortenings.

[0025] The method may further comprise, between said steps (c) and (d), a step of: (c1) installing a hold-down tool between the first end connector and the first hub fixing the alignment between the first end connector and the first hub. The hold-down tool can be used to fix or lock the orientation of the first end connector vis-a-vis the first hub during the subsequent alignment of the second end connector. The second end connector can then be manipulated into the correct position using the adjustable rigging(s) and push / pull ram(s) as desired.

[0026] The method may further comprise, after said step (d), a step of: (e) landing the first end connector and the second end connector on the first hub and the second hub, respectively. The step of landing the end connectors on the hubs may be performed by slacking the adjustable riggings, venting soft land cylinders, e.g. arranged in the end connectors, or by a combination of slacking the adjustable riggings and venting soft land cylinders.

[0027] The method may further comprise, after said step (e), a step of: (f) disconnecting the flowline jumper from the spreader structure and recovering the spreader structure to the surface location. Disconnecting the flowline jumper may comprise disconnecting the adjustable rigging(s) from the flowline jumper and, if present, static riggings, from the flowline jumper. Disconnecting the adjustable rigging(s) from the flowline jumper may be performed using one or a plurality of ROVs. Recoveringthe spreader structure may comprise raising the spreader structure to the surface location. Preferably, the riggings are maintained attached to the spreader structure such that the riggings can be raised together with the spreader structure.

[0028] The method may further comprise, after said step (f), a step of: (g) locking the first end connector and the second end connector to the first hub and the second hub, respectively. Step (g) may be expressed as two steps: step (gl) of locking the first end connector to the first hub and step (g2) of locking the second end connector to the second hub. The locking may be performed in any order or simultaneously. This step may further comprise a sub-step of performing seal tests on the end connectors. Seal tests may be performed on an end connector and hub once the end connector has been locked to the hub. The steps of locking the first end connector and the second end connector to the first hub and the second hub, respectively, may be performed using one or a plurality of ROVs.

[0029] The method may further comprise, after said step (g), a step of: (h) disconnecting the holddown tool from the first end connector and from the first hub, and disconnecting, where present: said first push / pull ram from the vertical jumper sections of the first goose-neck section; and said second push / pull ram from the vertical jumper sections of the second goose-neck section, and recovering, to the surface location, the disconnected hold-down tool and push / pull ram(s). This step is preferably conducted after the end connectors have been locked to the hubs. The push / pull rams are usually the most robust construction elements in the arrangement, and it is advantageous that the assembly is kept as stable as possible until the end connectors have been locked to the hubs. Disconnecting and recovering the push / pull rams may be performed using one or a plurality of ROVs.

[0030] According to a second aspect, there is provided a flowline jumper handling arrangement for supporting a flowline jumper during subsea installation. The flowline jumper handling arrangement comprises a spreader structure and riggings extending from the spreader structure for supporting the subsea jumper; wherein the spreader structure comprises: a longitudinal spreader bar extending along a longitudinal axis; and at least one transversal spreader bar connected to the longitudinal spreader bar and extending from the longitudinal spreader bar in a direction deviating from the longitudinal axis; and wherein the rigging comprises: a first adjustable rigging configured to extend between the at least one transversal spreader bar and a first end connector of the flowline jumper for supporting the first end connector; and a second adjustable rigging configured to extend between the at least one transversal spreader bar and a second end connector of the flowline jumper for supporting the second end connector.

[0031] The riggings may further comprise at least one static rigging extending from the longitudinal spreader bar and being configured for supporting a flowline conduit of the flowline jumper. The at least one static rigging may comprise: a static rigging configured for supporting a first gooseneck section of the subsea jumper; a static rigging configured for supporting a second goose-neck section of the subsea jumper; and a static rigging configured for supporting an intermediate jumper section interconnecting the first and second goose-neck sections.

[0032] The at least one transversal spreader bar may comprise a first transversal spreader bar configured for supporting said first adjustable rigging; and a second transversal spreader bar configured for supporting said second adjustable rigging. Each transversal spreader bar may comprise a plurality of attachment points for the respective adjustable rigging, thus allowing alternative positions from which to support the end connectors. As previously stated, it may be advantageous to install the adjustable riggings at the seafloor location, at which point in time the nature of any misalignment between the end connectors and the hubs will be more apparent. Providing each transversal spreader bar with a plurality of attachment points for the adjustable riggings allows the most suitable rigging setup to be chosen at the seafloor location to correct any misalignment between the end connector(s) and the hub(s).

[0033] The first transversal spreader bar may be connected to the longitudinal spreader bar at a first distal end of the longitudinal spreader bar. The second transversal spreader bar may be connected to the longitudinal spreader bar at a second distal end of the longitudinal spreader bar.

[0034] The riggings may further comprise a third adjustable rigging configured to extend between the longitudinal spreader bar and an intermediate jumper section of the flowline jumper fluidly interconnecting the first and second end connectors, the third adjustable rigging being configured for supporting the intermediate jumper section. The third adjustable rigging provides additional flexibility to manipulate the end connectors to shift the axial orientation of the first and / or second end connector to align them to the hubs.

[0035] The flowline jumper handling arrangement may further comprise: a first push / pull ram configured for adjusting a lateral distance between two vertical jumper sections of a first goose-neck section of the flowline jumper associated with the first end connector; and a second push / pull ram configured for adjusting a lateral distance between two vertical jumper sections of a second goose-neck section of the flowline jumper associated with the second end connector. The length of the push / pull rams can be adjusted to adjust the lateral distance between the vertical jumper sections. The push / pullrams provide yet additional flexibility to manipulate the end connectors to shift their respective axial orientation to align them to the hubs.

[0036] Said longitudinal spreader bar and said first and second transversal spreader bars may be arranged in a common plane. Each of said first and second transversal spreader bars may extend in a direction that is orthogonal or substantially orthogonal to said longitudinal axis. The orthogonal arrangement of the transversal spreader bars relative to the longitudinal spreader bar provides a stable and balanced structure for supporting the flowline jumper.

[0037] According to a third aspect, there is provided a spreader structure for supporting a flowline jumper during subsea installation as described above.

[0038] According to a fourth aspect, there is provided a kit of parts comprising a spreader structure as described above, and riggings as described above.

[0039] According to a fifth aspect, there is provided a method of controlling at least one remotely operated vehicle, ROV, to install a flowline jumper between a first hub and a second hub of a subsea system, the flowline jumper comprising a first end connector, a second end connector, and a jumper conduit fluidly interconnecting the first and second end connectors, and wherein the flowline jumper is attached to a spreader structure comprising a longitudinal spreader bar extending along a longitudinal axis and at least one transversal spreader bar connected to the longitudinal spreader bar and extending from the longitudinal spreader bar in a direction deviating from the longitudinal axis, the method comprising the steps of: (a) controlling the at least one ROV to align the first end connector with the first hub; and (b) controlling the at least one ROV to align the second end connector with the second hub; wherein at least one of step (a) and (b) comprises at least one of the sub-steps of: (i) controlling the at least one ROV to lengthen or shorten a first adjustable rigging installed between the at least one transversal spreader bar and the first end connector; and (ii) controlling the at least one ROV to lengthen or shorten a second adjustable rigging installed between the at least one transversal spreader bar and the second end connector.

[0040] Controlling the ROV may comprise sending instructions or control signals to the ROV. The method according to the fifth aspect may include any of the steps of the methods described above, and these may also be performed by controlling the ROV.

[0041] According to a sixth aspect, there is provided a method for manipulating a flowline jumper, the method comprising the steps of: (a) monitoring, at a subsea location and with one or more sensors,an end connector of the flowline jumper and at least one hub of a subsea system; (b) determining, based on the monitoring, a manipulation of the flowline jumper to align the end connector with the at least one hub; (c) determining, based on the manipulation, at least one adjustment of an adjustable rigging connected between a spreader structure and the flowline jumper to cause the manipulation; and (d) controlling an ROV to perform the at least one adjustment.

[0042] Above-discussed preferred and / or optional features of each aspect may be used, alone or in appropriate combination, in the other aspects.

[0043] The claimed invention is specified in the independent claims of this application. Advantageous adaptations and versions of the claimed invention are specified in the independent claims.BRIEF DESCRIPTION OF FIGURES

[0044] Fig. 1 shows a perspective view of a flowline jumper being installed at a subsea system using a first flowline handling arrangement.

[0045] Figs. 2a-2f show side views of different stages of installation of the flowline jumper at the subsea system using the first flowline handling arrangement.

[0046] Fig. 3 shows an adjustable rigging comprising a chain hoist.

[0047] Fig. 4 shows a push / pull ram.

[0048] Fig. 5 shows a perspective view of a flowline jumper being installed at a subsea system using a second flowline handling arrangement.

[0049] Common reference numerals are used throughout the figures to indicate similar features.DETAILED DESCRIPTION

[0050] In the following, one or more specific embodiments of the invention will be described in more detail with reference to the drawings. However, it is specifically intended that the invention is not limited to the embodiments and illustrations contained herein but includes modified forms of the embodiments including portions of the embodiments and combinations of elements of different embodiments as come within the scope of the following claims. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation- specific decisions must be made to achieve the developer’s specific goals, such as compliance with system and / or business-related constraints, which may vary from one implementationof the invention to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication and manufacture for the skilled person having the benefit of this disclosure.

[0051] Fig. 1 illustrates a flowline handling arrangement 100, a flowline jumper 200, and two hubs304, 306 of a subsea system 300. The flowline handling arrangement 100 is provided for installing the flowline jumper 200 so that it is connected between the two hubs 304, 306. By connecting the flowline jumper 200 between the hubs 304, 306, the hubs 304, 306 may be fluidly interconnected, allowing fluid communication from one hub to the other, such as to allow a hydrocarbon-containing fluid to flow from a termination of a Christmas tree arrangement to a subsea manifold.

[0052] Starting with the flowline jumper 200 and subsea system 300, the flowline jumper 200 comprises a jumper conduit 202. The flowline jumper 200 has a first end connector 204 and a second end connector 206 located at opposite ends of the jumper conduit 202, such that the first end connector 204 and second end connector 206 are fluidly interconnected by the jumper conduit 202. The first end connector 204 and second end connector 206 are configured to mate with and to form a seal with respective hubs 304, 306 on the subsea system 300. The first end connector 204 is configured to mate with the first hub 304, while the second end connector 206 is configured to mate with the second hub 306. The jumper conduit 202 fluidly interconnects the first and second end connectors 204, 206. Accordingly, mating the first and second end connectors 204, 206 with their respective hubs 304, 306 and forming a seal between those components allows fluid interconnection of the hubs 304, 306.

[0053] The jumper conduit 202 includes a first goose-neck section 214, a second goose-neck section 216, and an intermediate jumper section 202D that fluidly interconnects the first goose-neck section 214 and the second goose-neck section 216. The first goose-neck section 214 connects at one end to the first end connector 204 and at another end to the intermediate jumper section 202D. The first goose-neck section 214 includes a first vertical jumper section 202A that connects to the first end connector 204, a horizontal jumper section 202B that connects to the first vertical jumper section 202A, and a second vertical jumper section 202C that connects to the horizontal jumper section 202B and to the intermediate jumper section 202D. The first and second vertical jumper sections 202A, 202C extend in the same plane, and together with the horizontal jumper section 202B form a U-shaped arrangement, to provide the characteristic goose-neck shape. Similarly, the second goose-neck section 216 connects at one end to the second end connector 206 and at another end to the intermediate jumper section 202D. The second goose-neck section 216 includes a first vertical jumper section 202E that connects to thesecond end connector 206, a horizontal jumper section 202F that connects to the first vertical jumper section 202E, and a second vertical jumper section 202G that connects to the horizontal jumper section 202F and to the intermediate jumper section 202D. The first and second vertical jumper sections 202E, 202G extend in the same plane, and together with the horizontal jumper section 202F form a U-shaped arrangement, to provide the characteristic goose-neck shape. The first and second goose-neck sections 214, 216 are also provided in the same plane, at least when initially connected to the flowline handling arrangement 100.

[0054] The first and second hubs 304, 306 that are to be interconnected may have shifted compared to their expected positions or orientations. Accordingly, the flowline jumper 200 may be unable to directly connect to the hubs 304, 306 in its initial configuration. Some movement of the end connectors 204, 206 may enable the end connectors 204, 206 to better conform to the current position and orientations of the hubs 304, 306. To enable such movement to be achieved, the flowline handling arrangement 100 is provided. Fig. 1 will be referred to below to explain the arrangement of the flowline handling arrangement 100, while Figs. 2a to 2f are provided and explained below to describe a method by which the flowline jumper 200 may be installed using the flowline handling arrangement 100.

[0055] Continuing with Fig. 1 initially, the flowline handling arrangement 100 comprises a spreader structure 110. Riggings 150 extend from the spreader structure 110 for supporting the flowline jumper 200. The flowline jumper 200 is suspended from the spreader structure 110. In Fig. 1, the flowline jumper 200 was suspended from the spreader structure 110 at a surface location and was lowered to its current position, shown in Fig. 1, at a subsea location. At least some of the riggings 150 are adjustable, meaning that the flowline jumper 200 can be manipulated subsea to enable it to be fitted to the hubs 304, 306. Said manipulation may be manipulation relative to the flowline handling arrangement 100 and / or relative to itself, i.e. relative manipulation of the end connectors 204, 206.

[0056] The spreader structure 110 includes a longitudinal spreader bar 112 extending along a longitudinal axis L. The spreader structure 110 also includes a first transversal spreader bar 114 and a second transversal spreader bar 116 that are connected to the longitudinal spreader bar 112. The first and second transversal spreader bars 114, 116 extend along transversal axes T. The transversal axes T are parallel with one another and are arranged orthogonally to the longitudinal axis L, such that the first and second transversal spreader bars 114, 116 extend in directions that deviate from the longitudinal axis, and in this case extend orthogonally from the longitudinal spreader bar 112. While orthogonal in this example, the transversal axes T and therefore the transversal spreader bars 114, 116 may extendfrom the longitudinal spreader bar in one or more other directions that deviate from the longitudinal axis L.

[0057] The length of the spreader structure 110 is approximately equal to the length of the flowline jumper 200. The longitudinal spreader bar 112 extends along the length of the spreader structure 110, and the transversal spreader bars 114, 116 are positioned at opposing distal ends of the longitudinal spreader bar 110. As the end connectors 204, 206 of the flowline jumper are provided at either end of the flowline jumper, the transversal spreader bars 114, 116 are therefore positioned vertically above, or substantially vertically above, the end connectors 204, 206 when the flowline jumper 200 is suspended from the spreader structure 110.

[0058] The spreader structure 110 also includes two support bars 118, 120, which are also connected and extend orthogonally to the longitudinal spreader bar 112. The support bars 118, 120 provide connection points for connecting the spreader structure 110 to a crane line 10 for suspension from a crane (not shown in Fig. 1) via a sling 142 and bridle 140.

[0059] The riggings 150 extend from the spreader structure 110 to support the flowline jumper 200. The riggings 150 include static riggings 152, which extend from the longitudinal spreader bar 112 to support various sections of the jumper conduit 202. The static riggings 152 are distributed along the longitudinal spreader bar 112 to provide sufficient support for the flowline jumper 200 along its length. One static rigging 152 connects to each of the first goose-neck section 214 and the second goose-neck section 216, while two static riggings 152 are shown connecting to the intermediate conduit 202D. The static riggings 152 are non-adjustable chains in this example but may be other types of static rigging in other examples. More or fewer static riggings 152 for other examples, and the number of static riggings 152 may depend on the length and design of the flowline jumper 200.

[0060] The riggings 150 also includes adjustable riggings, which allow for manipulation of flowline jumper 200 and particularly the second end connector 206 relative to the first end connectors 204 during installation of the flowline jumper 200. The riggings 150 include a first adjustable rigging 154, which extends between the first transversal spreader bar 114 and the first end connector 204, a second adjustable rigging 156, which extends between the second transversal spreader bar 116 and the second end connector 206, and a third adjustable rigging 158, which extends between the longitudinal spreader bar 112 and the intermediate jumper section 202D. The first and second adjustable riggings 154, 156 extend from opposite sides of their respective transversal spreader bars 114, 116 to connect tothe end connectors 204, 206, enabling a balanced arrangement about the longitudinal spreader bar 112. However, the first and second adjustable riggings 154, 156 may be connected to the opposite ends of the transversal spreader bars 114, 116 in other examples.

[0061] The adjustable riggings 154, 156, 158 comprise chains having a variable length. Dynamically adjusting the length of the chains may result in the end connectors 204, 206 to be repositioned relative to the rest of the flowline jumper 200. Specifically, the adjustable riggings 154, 156, 158 may allow for the relative pitch and / or yaw of the end connectors 204, 206 to be changed.

[0062] The longitudinal spreader bar 112 comprises at least one attachment point for connecting to each static rigging 152 and to the third adjustable rigging 158. The first transversal spreader bar 114 comprises at least one attachment point for connecting to the first adjustable rigging 154, and the second transversal spreader bar 116 comprises at least one attachment point for connecting to the second adjustable rigging 156. These attachment points are not visible in Fig. 1. The adjustable riggings 154, 156, 158 may be temporarily attachable to the spreader structure 110, such that the adjustable riggings 154 156, 158 can be connected to and disconnected from the spreader structure 110 as desired.

[0063] The flowline jumper handling arrangement 100 further comprises a first push / pull ram 164 and a second push / pull ram 166. The first push / pull ram 164 is configured to adjust a lateral distance between the first and second vertical jumper sections 202A, 202C of the first goose-neck section 214, while the second push / pull ram 166 is configured to adjust a lateral distance between first and second vertical jumper sections 202E, 202G of the second goose-neck section 216. The first push / pull ram 164 is installed between the first and second vertical jumper sections 202A and 202C of the first goose-neck section 214 and the second push / pull ram 166 is installed between the first and second vertical jumper sections 202E, 202G ofthe second goose-neck section 216. Extending or retracting a push / pull ram 164, 166 may increase or decrease a lateral distance between the vertical jumper sections 202A and 202C, thereby moving the end connectors towards or away from the rest of the flowline jumper 200. The push / pull rams 164, 166 therefore allow for fine-tuning of the geometry of the flowline jumper 200 during the installation process. Specifically, the rams 164, 166 allow for alteration of the relative distances between the first and second end connectors 204, 206.

[0064] The adjustable riggings 154, 156, 158 and the push / pull rams 164, 166 are configured for operation by remotely operated vehicles (ROVs) or by divers during the subsea installation process.

[0065] Turning now to Figs. 2a to 2f, a series of side views are provided, illustrating the installation of the flowline jumper 200 between the two hubs 304, 306 of the subsea system 300 using the flowline handling arrangement 100. Figs. 2a to 2f show first to sixth stages or steps of the installation method.

[0066] Fig . 2a shows a first stage of the installation method, which is the attachment of the flowline jumper 200 to the spreader structure 110 of a flowline handling arrangement 100 at a surface location using static riggings 152. The flowline jumper 200 is suspended from the flowline handling arrangement 100 by the static riggings 152 extending between the longitudinal spreader bar 112 of the spreader structure 110 and the jumper conduit 202. The flowline handling arrangement 100 is connected to a crane, although this is not shown in Figs. 2a to 2f. The adjustable riggings 154, 156, 158 and push / pull rams 164, 166 are not mounted to the spreader structure 110 in this step, such that the flowline jumper 200 is initially suspended from the spreader structure 110 by the static riggings 152 only. In other examples, the adjustable riggings and push / pull rams may be connected in this step.

[0067] Fig. 2b illustrates a second stage of the installation method, which is the lowering of the spreader structure 110 and the attached flowline jumper 200 to a subsea location, where the subsea system 300 and its hubs 304, 306 are positioned. The subsea system 300 is positioned on the seafloor, in this example, such that the seafloor is the subsea location.

[0068] The crane lowers the spreader structure 110 and attached flowline jumper 200 to the subsea location. The static riggings 152 support the flowline jumper 200 during the lowering process, maintaining its shape and orientation. As the flowline jumper 200 approaches the subsea system 300, the first end connector 204 is positioned above the first hub 304. This initial positioning is achieved by manoeuvring the crane at the surface location to position the spreader structure 110 appropriately, while fine adjustments to the position may be made using remotely operated vehicles (ROVs) 20 present at the subsea location.

[0069] To maintain the position of the first end connector 204 above the first hub 304, a holddown tool 170 may be installed. The hold-down tool 170 is a temporary device that secures the position of the first end connector 204 relative to the first hub 304 without fully connecting them. This allows for subsequent adjustments to be made to the alignment of the first end connector 204 and to the position and alignment of the second end connector 206 while maintaining the position of the first end connector 204 relative to the first hub 304.

[0070] Fig. 2c illustrates a third stage of the installation method, which is the installation and adjustment of the adjustable riggings 154, 156, 158 and the push / pull rams 164, 166 to align the first and second end connector 204, 206 with the first and second hub 304, 306, respectively. In Fig. 2c, the first end connector 204 continues to be held in place by the hold-down tool 170. Accordingly, the first end connector 204 can be aligned with the first hub 304, and the second end connector 206 can be aligned with the second hub 306 to enable the flowline jumper 200 to be connected to the subsea system 300.

[0071] The ROVs may include sensors that enable the relative positions and orientations of the end connectors 204, 206 and the hubs 304, 306 to be determined and analysed. It may then be determined how the second end connector 206 is to be moved to be able to be landed on the second hub 306. Subsequently, it may be determined which, if any, adjustable riggings and rams are to be deployed to move the flowline jumper to achieve alignment between the second end connector 206 and the second hub 306, and which adjustments and in which order are to be made of the riggings and / or rams. The ROVs can then be controlled to install the riggings as appropriate, and the alignment between the end connectors 204, 206 and the hubs 304, 306 can be effectuated by the ROVs lengthening or shortening, in an appropriate combination, at least one of the first adjustable rigging 154, the second adjustable rigging 156, the third adjustable rigging 158, the first push / pull ram 164, and the second push / pull ram 166.

[0072] In the example of Fig. 2c, the ROVs 20 have been controlled to install the first adjustable rigging 154 between the first transversal spreader bar 114 and the first end connector 204 and the second adjustable rigging 156 between the second transversal spreader bar 116 and the second end connector 206. The ROVs 20 have also been controlled to install the third adjustable rigging 158 between the longitudinal spreader bar 112 and the intermediate jumper section 202D, and to install the first push / pull ram 164 between the vertical jumper sections 202A and 202C of the first goose-neck section 214 and the second push / pull ram 166 between the vertical jumper sections 202E and 202G of the second gooseneck section 216.

[0073] Each of the adjustable riggings 154, 156, 158 are installed in this example, as are the push / pull rams 164, 166. In other examples one or more of the adjustable riggings and push / pull rams may be installed, depending on which is desired for manipulating the flowline jumper 200. The adjustable riggings and rams may be provided to the subsea location by a separate crane line, by the ROVs, or may already be present at the subsea location.

[0074] Although it is described that the installation is by the ROVs 20, each installation may be performed by one ROV, by a subset of the total number of ROVs, or by all the ROVs. In this example, two ROVs 20 are depicted, and each may install corresponding riggings and rams, both may be used to install each rigging and ram, or a combination of these. Alternatively, the riggings and rams may be installed and actuated via diver(s) or a combination of diver(s) and ROV(s).

[0075] To facilitate the alignment of the first and second end connector 204, 206 with the first and second hub 304, 306, respectively, the adjustable riggings 154, 156, 158 and push / pull rams 164, 166 may be adjusted by controlling the ROVs 20. The yaw and pitch of the flowline jumper 200 overall, the yaw and pitch of the end connector 206 relative to the first end connector 204, and the distance between the first and second end connectors 204, 206 may be varied by said adjustment.

[0076] The ROVs 20 may be controlled to perform specific adjustments to align the second end connector 206 with the second hub 306. For example, the first adjustable rigging 154 installed between the first transversal spreader bar 114 and the first end connector 204 may be lengthened or shortened to adjust the pitch and yaw of the first end connector 204. Similarly, the second adjustable rigging 156 installed between the second transversal spreader bar 116 and the second end connector 206 may be lengthened or shortened to adjust the pitch and yaw of the second end connector 206. The third adjustable rigging 158 installed between the longitudinal spreader bar 112 and the intermediate jumper section 202D may be lengthened or shortened to further refine the overall positioning of the flowline jumper 200. The first push / pull ram 164 installed between the vertical jumper sections 202A, 202C of the first goose-neck section 214 may be lengthened or shortened to adjust the lateral distance between these vertical jumper sections, and the second push / pull ram 166 installed between the vertical jumper sections 202E, 202G of the second goose-neck section 216 may be lengthened or shortened to adjust the lateral distance between these sections. These adjustments may cause lateral displacement between the end connectors 204, 206.

[0077] Generally, the ROVs may be controlled to perform these adjustments iteratively and using small changes before the alignment is reassessed using, e.g., cameras and other sensors on the ROVs and / or remotely deployed sensors and cameras. The combination of adjustments to the riggings and push / pull rams allows for precise control over the position and orientation of the flowline jumper 200.

[0078] Fig. 2d illustrates a fourth stage of the installation method for the flowline jumper 200, in which the first end connector 204 and the second end connector 206 are landed on the first hub 304 andthe second hub 306, respectively. After aligning the end connectors with their corresponding hubs, the flowline jumper 200 is lowered towards the subsea system 300. As the flowline jumper 200 descends, the first end connector 204 and second end connector 206 approach their respective hubs 304, 306.

[0079] The ROVs 20 may be controlled to vent soft land cylinders (not shown in Fig. 2d) associated with the end connectors 204, 206, thereby providing a controlled descent and cushioning as the end connectors make contact with the hubs. As the end connectors 204, 206 make contact with their respective hubs 304, 306, the ROVs 20 may be controlled to ensure proper seating and initial engagement between the end connectors and the hubs. The hold-down tool 170 may remain in place during this stage to maintain the alignment of the first end connector 204 with the first hub 304.

[0080] Fig. 2e illustrates a fifth stage of the installation method for the flowline jumper 200, which involves disconnecting the static riggings 152 and the adjustable riggings 154, 156, 158 from the flowline jumper 200 and retrieving the riggings 150 and spreader structure 110 to the surface location.

[0081] After the first end connector 204 and the second end connector 206 are landed on their respective hubs 304, 306, the ROVs 20 are controlled to disconnect the static riggings 152 from the flowline jumper 200 and to disconnect the first adjustable rigging 154 from the first end connector 204, the second adjustable rigging 156 from the second end connector 206, and the third adjustable rigging 158 from the intermediate jumper section 202D.

[0082] Once all riggings are disconnected, the spreader structure 110 is recovered to the surface location by lifting the spreader structure 110 along with the static riggings 152 and adjustable riggings 154, 156, 158 as a single unit. During this recovery, the static riggings 152 and adjustable riggings 154, 156, 158 may remain attached to their respective connection points on the spreader structure 110.

[0083] The hold-down tool 170 may remain in place during this stage, continuing to secure the first end connector 204 to the first hub 304. The push / pull rams 164 and 166 may also be maintained in position during this step. This ensures that the alignment and positioning of the second end connector 306 is maintained while the spreader structure 110 and riggings are removed.

[0084] Fig. 2f illustrates a sixth stage of the installation method for the flowline jumper 200, which involves locking the end connectors 204, 206 to the hubs 304, 306 and any final adjustments, such as performing seal tests and removing the hold-down tool 170 and push / pull rams 164, 166.

[0085] After the first end connector 204 and the second end connector 206 are landed on their respective hubs 304, 306, the ROVs 20 may be controlled to lock the end connectors 204, 206 in place. This locking process secures the flowline jumper 200 to the subsea system 300, creating a fluid-tight connection between the jumper conduit 202 and the hubs 304, 306, and thereby allowing fluid communication between the two.

[0086] Once the end connectors 204, 206 are locked to the hubs 304, 306, seal tests may be performed to ensure the integrity of the connections. These tests verify that the seals between the end connectors 204, 206 and the hubs 304, 306 are properly formed and capable of withstanding the pressures they will experience during operation. The seal tests may involve pressurizing the flowline jumper 200 and monitoring for any pressure loss or leaks at the connection points.

[0087] After successful completion of the seal tests, the ROVs 20 may be controlled to disconnect the hold-down tool 170 from the first end connector 204 and the first hub 304 and to disconnect the first push / pull ram 164 from the vertical jumper sections 202A, 202C of the first goose-neck section 214 and the second push / pull ram 166 from the vertical jumper sections 202E, 202G of the second goose-neck section 216. The hold-down tool 170 and push / pull rams 164, 166 may then be recovered to the surface location.

[0088] The removal of the hold-down tool 170 and push / pull rams 164, 166 completes the installation process, leaving the flowline jumper 200 securely connected between the first hub 304 and the second hub 306 of the subsea system 300. The flowline jumper 200 is now ready for operational use, providing a fluid pathway between the two hubs 304, 306.

[0089] Fig. 3 illustrates an example of an adjustable rigging that may be used as the first adjustable rigging 154, the second adjustable rigging 156, or the third adjustable rigging 158. The adjustable rigging in Fig. 3 is in the form of a chain hoist 155, 157, 159. The chain hoist comprises a chain extending between two hooks. The hooks may connect to respective connection points on the spreader structure and the end connector or jumper conduit, or to temporary riggings attached to these positions. A hoist mechanism is provided to lengthen or shorten the amount of chain between the two hooks. The hoist mechanism is configured to interfacing with an ROV.

[0090] Fig. 4 illustrates a push / pull ram that may be used as the first push / pull ram 164 or the second push / pull ram 166. The push / pull ram 164, 166 is connected, at either end to vertical jumpersections by corresponding clamps. An adjustment mechanism is provided on the push / pull ram 164, 166, including an interface for adjustment by an ROV.

[0091] Fig. 5 illustrates an alternative flowline handling arrangement 400 from which the flowline jumper 200 is suspended. The flowline jumper 200 and subsea system 300 are shown in Fig. 5, and include the same features as in Fig. 1.

[0092] In Fig. 5, the flowline handling arrangement 400 has similar features to the flowline handling arrangement 100 of Fig. 1, except that it comprises, in addition to the first and second transversal spreader bars 114, 116 extending from the distal ends of the longitudinal spreader bar 112, a central transversal spreader bar 414 extending across the longitudinal spreader bar 412. The transversal spreader bar 414 extends orthogonally to either side of the longitudinal spreader bar 412. A first adjustable rigging 454 extends from a first end of the transversal spreader bar 414 to the first end connector 204 of the flowline jumper 200, and a second adjustable rigging 456 extends from a second end of the transversal spreader bar 414 to the second end connector 206 of the flowline jumper 200. The first and second ends are on opposing sides of the longitudinal spreader bar 412. The transversal spreader bar 414 therefore supports and enables manipulation of both end connectors 204, 206.

[0093] The spreader structure 410 also includes the supports 418, 420 for suspending the structure 410 from a crane line via the slings 442 and bridle 440. Static riggings 452 extend from the longitudinal spreader bar 412, and a third adjustable rigging 458 is also provided between the longitudinal spreader bar 412 and the flowline jumper 200. The push / pull rams 464, 466 are also depicted between corresponding goose-neck sections of the flowline jumper 200.

[0094] Although the examples described herein include either two transversal spreader bars at opposing ends of a longitudinal spreader bar or two transversal spreader bars at opposing ends of a longitudinal spreader bar and an additional central transversal spreader bar at a central location along the longitudinal spreader bar, other examples may include a single transversal spreader bar, e.g. centrally located as disclosed in Fig. 5, or a plurality of transversal spreader bars arranged at locations differing from those depicted.

[0095] Furthermore, the examples described herein illustrate transversal spreader bars that extend to either side of the longitudinal spreader bar. In other examples, transversal spreader bars may extend to one side of the longitudinal spreader bar only.

[0096] In the process depicted in Figs. 2a to 2f, the adjustable riggings are installed after the first end connector has been correctly positioned and held in place using the hold-down tool. In other examples, the riggings may be installed prior to this step, and the adjustable riggings may be used to aid in positioning and aligning the first end connector with the first hub.

Claims

CLAIMS1. A method of installing a flowline jumper (200) between a first hub (304) and a second hub (306) of a subsea system (300), the flowline jumper (200) comprising a first end connector (204), a second end connector (206) and a jumper conduit (202) fluidly interconnecting the first and second end connectors (204, 206), the method comprising the steps of:(a) at a surface location, suspending the flowline jumper (200) from a spreader structure (110) comprising a longitudinal spreader bar (112) extending along a longitudinal axis (L) and at least one transversal spreader bar (114, 116) connected to the longitudinal spreader bar (112) and extending from the longitudinal spreader bar (112) in a direction (T) deviating from the longitudinal axis (L);(b) lowering the spreader structure (110) and the suspended flowline jumper (200) to a subsea location of the subsea system (300);(c) aligning the first end connector (204) with the first hub (304); and(d) aligning the second end connector (206) with the second hub (306); wherein at least one of steps (c) and (d) comprises at least one of the sub-steps of:(i) installing a first adjustable rigging (154) between the at least one transversal spreader bar (114) and the first end connector (204) and lengthening or shortening the first adjustable rigging (154); and(ii) installing a second adjustable rigging (156) between the at least one transversal spreader bar (114) and the second end connector (206) and lengthening or shortening the second adjustable rigging (156).

2. The method according to claim 1, wherein said at least one transversal spreader bar (114, 116) comprises a first transversal spreader bar (114) and a second transversal spreader bar (116), and wherein at least one of said steps (c) and (d) comprises at least one of the sub-steps of:(i1) installing the first adjustable rigging (154) between the first transversal spreader bar (114) and the first end connector (204) and lengthening or shortening the first adjustable rigging (154); and(ii1) installing the second adjustable rigging (156) between the second transversal spreader bar (114) and the second end connector (206) and lengthening or shortening the second adjustable rigging (156).

3. The method according to any one of claims 1 and 2, wherein at least one of said steps (c) and (d) comprises the sub-step of:(iii) installing a third adjustable rigging (158) between the longitudinal spreader bar (112) and the jumper conduit (202) and lengthening or shortening the third adjustable rigging (158).

4. The method according to any one of claims 1-3, wherein at least one of said steps (c) and (d) comprises at least one of the sub-steps of:(iv) installing a first push / pull ram (164) between vertical jumper sections (202A, 202C) of a first goose-neck section (214) of the jumper conduit (202) associated with the first end connector (204) and lengthening or shortening the first push / pull ram (164); and(v) installing a second push / pull ram (166) between vertical jumper sections (202E, 202G) of a second goose-neck section (216) of the jumper conduit (202) associated with the second end connector (206) and lengthening or shortening the second push / pull ram (166).

5. The method according to any one of claims 1-4, wherein at least one of said sub-steps (i)-(v), (i’) and (ii’) comprises lengthening or shortening the adjustable rigging(s) and / or the push / pull ram(s) using one or a plurality of remotely operated vehicles (20).

6. The method according to any one of the preceding claims, comprising, between said steps (c) and(d), a step of:(c1) installing a hold-down tool (170) between the first end connector (204) and the first hub (304) fixing the alignment between the first end connector (204) and the first hub (304).

7. The method according to claim 6, comprising, after said step (d), a step of:(e) landing the first end connector (204) and the second end connector (206) on the first hub (304) and the second hub (306), respectively.

8. The method according to claim 7, comprising, after said step (e), a step of:(f) disconnecting the flowline jumper (200) from the spreader structure (110) and recovering the spreader structure (110) to the surface location.

9. The method according to claim 8, comprising, after said step (f), a step of:(g) locking the first end connector (204) and the second end connector (206) to the first hub (304) and the second hub (306), respectively.

10. The method according to claim 9, comprising, after said step (g), a step of:(h) disconnecting the hold-down tool (170) from the first end connector (204) and from the first hub (304), and disconnecting, where present:- said first push / pull ram (164) from the vertical jumper sections (202A, 202C) of the first goose-neck section (214); and- said second push / pull ram (166) from the vertical jumper sections (202E, 202G) of the second goose-neck section (216), and recovering, to the surface location, the disconnected hold-down tool (170) and push / pull ram(s) (164, 166).

11. A flowline jumper handling arrangement (100) for supporting a flowline jumper (200) during subsea installation, comprising a spreader structure (110) and riggings (150) extending from the spreader structure (110) for supporting the subsea jumper (200); wherein the spreader structure (110) comprises:- a longitudinal spreader bar (112) extending along a longitudinal axis (L); and- at least one transversal spreader bar (114, 116) connected to the longitudinal spreader bar (112) and extending from the longitudinal spreader bar (112) in a direction (T) deviating from the longitudinal axis (L); and wherein the riggings (150) comprise:- a first adjustable rigging (154) configured to extend between the at least one transversal spreader bar (114) and a first end connector (204) of the flowline jumper (200) for supporting the first end connector (204); and- a second adjustable rigging (156) configured to extend between the at least one transversal spreader bar (114) and a second end connector (206) of the flowline jumper (200) for supporting the second end connector (206).

12. The flowline jumper handling arrangement (100) according to claim 11, wherein the at least one transversal spreader bar (114, 116) comprises:- a first transversal spreader bar (114) configured for supporting said first adjustable rigging (154); and- a second transversal spreader bar (116) configured for supporting said second adjustable rigging (156).

13. The flowline jumper handling arrangement (100) according to claim 12, wherein the first transversal spreader bar (114) is connected to the longitudinal spreader bar (112) at a first distal end of the longitudinal spreader bar (112), and wherein the second transversal spreader bar (116) is connected to the longitudinal spreader bar ( 112) at a second distal end of the longitudinal spreader bar (112).

14. The flowline jumper handling arrangement (100) according to any one of claims 11-13, wherein the riggings (150) comprise a third adjustable rigging (158) configured to extend between the longitudinal spreader bar (112) and an intermediate jumper section (202D) of the flowline jumper (202) fluidly interconnecting the first and second end connectors (204, 206), the third adjustable rigging (158) being configured for supporting the intermediate jumper section (202D).

15. The flowline jumper handling arrangement (100) according to any one of claims 11-14, further comprising:- a first push / pull ram (164) configured for adjusting a lateral distance between two vertical jumper sections (202A, 202C) of a first goose-neck section (214) of the flowline jumper (200) associated with the first end connector (204); and- a second push / pull ram (166) configured for adjusting a lateral distance between two vertical jumper sections (202E, 202G) of a second goose-neck section (216) associated with the second end connector (206).

16. The flowline jumper handling arrangement (100) according to any one of claims 11-15, wherein said longitudinal spreader bar (112) and said at least one transversal spreader bars (114, 116) are arranged in a common plane.

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