Method of repairing and machining an inner turret slip ring

Abstract

The application discloses an inner rotating tower slip ring repairing and machining method, which comprises the following steps: step 1, installing a lifting lug; step 2, installing a precision control cross reinforcement; step 3, removing connecting facilities between the inner rotating tower and a floating production storage and offloading device; step 4, placing an inner rotating tower supporting pier on a wharf; step 5, hoisting the inner rotating tower out; step 6, cutting the inner rotating tower; step 7, hoisting the upper part of the inner rotating tower to the inner rotating tower supporting pier; step 8, repairing damaged areas of upper and lower slip rings; steps 9-10, installing corresponding equipment on the upper part of the inner rotating tower and above the lower part of the inner rotating tower; step 11, determining a machining amount; step 12, machining the upper and lower slip rings respectively; step 13, welding the upper part of the inner rotating tower and the lower part of the inner rotating tower to a joint; and step 14, hoisting the inner rotating tower back. The inner rotating tower slip ring repairing and machining method can satisfy repairing and machining of the upper and lower slip rings of the inner rotating tower, can prolong the service life of the inner rotating tower and can guarantee mooring safety of the FPSO.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ocean engineering, and particularly relates to a repairing and machining method for an inner rotating tower slip ring. BACKGROUND

[0002] At present, the inner rotating tower single point mooring system is widely applied to FPSO (floating production storage and offloading) projects due to its wide water depth adaptation range, strong resistance to marine environment and the like. The inner rotating tower mooring system allows the FPSO to rotate around the inner rotating tower to produce a wind vane effect, so that the bow of the FPSO always points to the direction in which the resultant of the environmental loads is smallest, and the FPSO is relatively fixed on the offshore oilfield operation site through the mooring force provided by the inner rotating tower.

[0003] Due to the fact that the FPSO hull is always subjected to the action of marine environmental loads, the hull loads are transmitted to the inner rotating tower through bearings, wherein the vertical loads are transmitted through axial bearings, and the horizontal loads are transmitted through radial bearings. The slip ring is installed on the inner rotating tower and directly contacts with the bearings installed on the hull, so that the relative rotation is realized and the force of the bearings is transmitted to the inner rotating tower. The FPSO has a long service period, and the long-term impact and vibration of the environmental loads may cause the wear of the slip ring, thereby affecting the mooring safety of the FPSO. In order to ensure the relative rotation of the hull and the inner rotating tower, the installation or repairing precision of the slip ring is required to be very high, and the outer ring of the slip ring generally needs to be machined to ensure the overall precision. The slip ring is located at the upper and lower ends of the inner rotating tower, and the height difference between the upper and lower ends is more than 30 meters. The conventional machining method is difficult to machine the upper and lower slip rings. In order to solve the above problems, a new slip ring repairing and machining technical scheme is required. SUMMARY

[0004] The purpose of the present application is to provide an inner rotating tower slip ring repairing and machining method capable of ensuring the precision of the slip ring.

[0005] The technical scheme adopted by the present application to achieve the above purpose is as follows: an inner rotating tower slip ring repairing and machining method, comprising the following steps:

[0006] Step 1: design a lifting lug according to the weight and gravity center information of the inner rotating tower, select a lifting hook of a floating crane, install four lifting lugs on the upper part of the inner rotating tower, and perform flaw detection;

[0007] Step 2: install four precision control cross reinforcements in the inner rotating tower, mark the center position, perform precision measurement, and record the precision data;

[0008] Step 3: perform preparation work, clean the inner rotating tower area, and remove the connecting facilities between the inner rotating tower and the floating production storage and offloading device;

[0009] Step 4, place the inner turret support piers of the upper and lower inner turret on the wharf, and measure the upper surface of the inner turret support pier for accuracy to ensure the levelness;

[0010] Step 5, use the floating crane hook to hoist the inner turret out of the floating production storage and offloading device, and place it on the inner turret support pier on the wharf and fix it;

[0011] Step 6, cut the inner turret into upper and lower parts at the middle position of the inner turret;

[0012] Step 7, hoist the upper part of the inner turret to the inner turret support pier placed on the wharf and fix it;

[0013] Step 8, weld and repair the damaged areas of the upper and lower slip rings;

[0014] Step 9, install the machining rotary platform, machining arm, stabilizing wheel, slide rail, precision measurement equipment, balance weight, work platform, and machining cutting equipment above the upper part of the inner turret;

[0015] Step 10, install the temporary support platform, machining rotary platform, machining arm, stabilizing wheel, slide rail, precision measurement equipment, balance weight, work platform, and machining cutting equipment above the lower part of the inner turret;

[0016] Step 11, measure the accuracy data of the upper and lower parts of the inner turret simultaneously to determine the machining amount;

[0017] Step 12, adjust the machining cutting equipment according to the accuracy data and process the upper and lower slip rings respectively;

[0018] Step 13, hoist the upper part of the inner turret to the upper part of the inner turret, adjust the position according to the measured accuracy data before disassembly, and weld the upper part of the inner turret and the lower part of the inner turret according to the slip ring repair welding sequence.

[0019] Step 14, hoist the inner turret back to the floating production storage and offloading device.

[0020] In step 2, install precision control cross reinforcements at the upper and lower slip ring positions of the inner turret and at the upper and lower ends near the cutting position.

[0021] In steps 8 and 12, the upper and lower slip rings are the upper radial slip ring, the upper axial slip ring, and the lower radial slip ring.

[0022] In step 8, the damaged areas of the upper and lower slip rings are replaced as a whole.

[0023] In step 12, measure the data of the upper and lower slip rings after machining.

[0024] The application is an inner rotating tower slip ring repairing and machining method, which can meet the repairing and machining of the upper and lower slip rings of the inner rotating tower, prolong the service life of the inner rotating tower to a certain extent and ensure the mooring safety of the floating production storage and offloading device (FPSO) by designing hoisting scheme, supporting scheme, cutting scheme, slip ring repairing scheme and slip ring machining scheme. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a hoisting diagram of the inner rotating tower of the inner rotating tower slip ring repairing and machining method.

[0026] Figure 2 is a cutting schematic diagram of the inner rotating tower of the inner rotating tower slip ring repairing and machining method.

[0027] Figure 3 is a machining schematic diagram of the upper slip ring of the inner rotating tower of the inner rotating tower slip ring repairing and machining method.

[0028] Figure 4 is a machining schematic diagram of the lower slip ring of the inner rotating tower of the inner rotating tower slip ring repairing and machining method.

[0029] Figure 5 is a precision control strengthening schematic diagram of the inner rotating tower of the inner rotating tower slip ring repairing and machining method.

[0030] Figure 6 is a slip ring welding repairing schematic diagram of the inner rotating tower of the inner rotating tower slip ring repairing and machining method.

[0031] In the figure: 1, floating crane hook; 2, hoisting rigging; 3, hoisting lug; 4, inner rotating tower; 5, upper part of the inner rotating tower; 6, lower part of the inner rotating tower; 7, upper radial slip ring; 8, upper axial slip ring; 9, lower radial slip ring; 10, precision control cross reinforcement; 11, precision measuring equipment; 12, machining arm; 13, stabilizing wheel; 14, slide rail; 15, machining rotary platform; 16, temporary support platform; 17, balance weight; 18, work platform; 19, machining cutting equipment; 20, inner rotating tower support pier. DETAILED DESCRIPTION

[0032] As shown in Figures 1 to 6 , the inner rotating tower slip ring repairing and machining method, as Figure 1 , Figure 5As shown, hoisting and precision control strengthen installation, step 1, according to the weight, center of gravity and other information of the inner turret 4, design hoisting lug 3, select the floating crane hook 1, install four hoisting lugs 3 on the upper part 5 of the inner turret, and carry out flaw detection; Step 2, install four cross precision control strengthenings 10 at the positions of the upper part radial slip ring 7, the upper part axial slip ring 8 and the lower part radial slip ring 9 inside the inner turret 4 and the upper and lower ends near the cutting position, and mark the center position, measure the precision, and record the precision data; Step 3, carry out preparation work, clean the inner turret area, and remove the pipe system, electrical and other connecting facilities between the inner turret and the floating production storage and offloading device (FPSO); such as Figure 2 As shown, inner turret support and cutting, step 4, arrange the inner turret support pier 20 of the upper part 5 and the lower part 6 of the inner turret in advance on the wharf, measure the accuracy of the upper surface of the inner turret support pier 20 to ensure the levelness; Step 5, use the floating crane hook 1 and hoisting rigging 2 to hoist the inner turret out of the floating production storage and offloading device (FPSO), and fall onto the inner turret support pier 20 on the wharf and fix it; Step 6, draw a line and cut in the middle position of the inner turret, cut the inner turret into two parts; Step 7, hoist the upper part 5 of the inner turret to the inner turret support pier 20 placed on the wharf and fix it; such as Figure 6 As shown, slip ring repair, step 8, check the state of the upper part radial slip ring 7, the upper part axial slip ring 8 and the lower part radial slip ring 9, measure the data, according to the sequence shown in the figure, repair or replace the whole of the damaged area or the whole of the upper part radial slip ring 7, the upper part axial slip ring 8 and the lower part radial slip ring 9, and carry out construction at the same time when welding; such as Figure 3 、 4As shown, the slip ring machining, step 9, install machining rotary platform 15, machining arm 12, stabilizing wheel 13, slide rail 14, precision measuring equipment 11, counterweight 17, work platform 18, machining cutting equipment 19 above inner rotating tower upper part 5; Step 10, install temporary support platform 16, machining rotary platform 15, machining arm 12, stabilizing wheel 13, slide rail 14, precision measuring equipment 11, counterweight 17, work platform 18, machining cutting equipment 19 above inner rotating tower lower part 6; Step 11, measure the precision data of inner rotating tower upper part 5 and inner rotating tower lower part 6 at the same time, determine the machining amount, adjust the position of machining equipment; Step 12, adjust the machining cutting equipment according to the precision data, process upper radial slip ring 7, upper axial slip ring 8 and lower radial slip ring 9 respectively, and measure the slip ring data after machining; Inner rotating tower back loading, step 13, hoist inner rotating tower upper part 5 to above inner rotating tower lower part 6, adjust the position according to the measured precision data before removal, weld inner rotating tower upper part 5 and inner rotating tower lower part 6 butt joint according to the slip ring repair welding sequence; Step 14, hoist the inner rotating tower as a whole back to the floating production storage and offloading device; The inner rotating tower slip ring repair and machining method of the application hoists the inner rotating tower from the floating production storage and offloading device (FPSO) ship body to the wharf support pier, cuts the inner rotating tower into upper and lower two parts from the middle of the inner rotating tower, hoists the upper part to the wharf support pier, and then repairs the upper and lower slip rings respectively, and then machines the slip ring after repair, through the design of hoisting scheme, support scheme, cutting scheme, slip ring repair scheme and slip ring machining scheme, the repair and machining of the upper and lower slip rings of the inner rotating tower can be satisfied, the service life of the inner rotating tower can be prolonged to a certain extent, and the mooring safety of the floating production storage and offloading device (FPSO) can be ensured.

Claims

1. An internal turntable slip ring repair and machining method, characterized by, The method comprises the following steps: Step 1. Designing lifting lugs according to the weight and gravity center information of the inner rotating tower, selecting a floating crane hook, installing four lifting lugs on the upper part of the inner rotating tower, and conducting flaw detection; Step 2. Installing four precision control cross reinforcements inside the inner rotating tower, marking the center position, conducting precision measurement, and recording precision data; Step 3. Conducting preparation work, cleaning the inner rotating tower area, and removing the connecting facilities between the inner rotating tower and the floating production storage and offloading device; Step 4. Placing the inner rotating tower support piers on the upper part and the lower part of the inner rotating tower on the wharf, conducting precision measurement on the upper surface of the inner rotating tower support piers, and ensuring the levelness; Step 5. Hoisting the inner rotating tower out of the floating production storage and offloading device using the floating crane hook, and placing and fixing the inner rotating tower on the inner rotating tower support piers on the wharf; Step 6. Cutting the inner rotating tower into upper and lower parts at the middle position of the inner rotating tower; Step 7. Hoisting the upper part of the inner rotating tower to the inner rotating tower support piers placed on the wharf and fixing it; Step 8. Welding and repairing the damaged areas of the upper and lower slip rings; Step 9. Installing machining rotary platforms, machining arms, stabilizing wheels, sliding rails, precision measurement equipment, balance weights, work platforms, and machining cutting equipment on the upper part of the inner rotating tower; Step 10. Installing temporary support platforms, machining rotary platforms, machining arms, stabilizing wheels, sliding rails, precision measurement equipment, balance weights, work platforms, and machining cutting equipment on the upper part of the lower part of the inner rotating tower; Step 11. Simultaneously measuring the precision data of the upper part and the lower part of the inner rotating tower to determine the machining amount; Step 12. Adjusting the machining cutting equipment according to the precision data, and machining the upper and lower slip rings respectively; Step 13. Hoisting the upper part of the inner rotating tower to the upper part of the lower part of the inner rotating tower, adjusting the position according to the measured precision data before removal, welding the upper part of the inner rotating tower and the lower part of the inner rotating tower according to the slip ring repair welding sequence, and determining the interface; Step 14. Hoisting the inner rotating tower back to the floating production storage and offloading device.

2. A method of repairing and machining an inner turret slip ring according to claim 1, characterized in that: In step 2, precision control cross reinforcements are installed at the upper and lower slip ring positions of the inner rotating tower and on the upper and lower ends near the cutting position.

3. A method of repair and machining of an inner turret sliding ring according to claim 1 or 2, characterized in that: In steps 8 and 12, the upper and lower slip rings are the upper radial slip ring, the upper axial slip ring, and the lower radial slip ring.

4. A method of repairing and machining an inner turret slip ring as defined in claim 1, wherein: In step 8, the damaged areas of the upper and lower slip rings are replaced with new ones instead of being welded and repaired.

5. A method of repairing and machining an inner turret slip ring as defined in claim 1, wherein: In step 12, the upper and lower slip ring data is measured again after machining.

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