Method for repairing and machining slip ring of inner turret

Abstract

The invention discloses a repairing and machining method for an inner turret slip ring. The repairing and machining method comprises the following steps that firstly, a lifting lug is installed and hoisted; step 2, mounting precision control cross reinforcement; 3, connecting facilities between the inner rotating tower and the floating type production oil storage and unloading device are dismantled; 4, an inner turret supporting pier is arranged on a wharf; 5, the inner rotating tower is hoisted out; step 6, cutting the inner turret; 7, the upper portion of the inner turret is hoisted to an inner turret supporting pier; 8, repairing the damaged area of the upper and lower sliding rings; 9-10, corresponding equipment is installed above the upper portion of the inner rotating tower and the lower portion of the inner rotating tower; 11, the machining amount is determined; 12, the upper slip ring and the lower slip ring are machined correspondingly; 13, butt joint openings of the inner turret upper portion and the inner turret lower portion are welded; and 14, the inner rotating tower is hoisted back. According to the inner turret slip ring repairing and machining method, repairing and machining of the upper slip ring and the lower slip ring of the inner turret can be met, the service life of the inner turret can be prolonged, and mooring safety of an FPSO is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of marine engineering, and in particular to a method for repairing and machining an inner turret slip ring. Background Art

[0002] At present, the inner turret single-point mooring system is widely used in FPSO (Floating Production Storage and Offloading) projects due to its advantages such as wide adaptability to water depth and strong resistance to marine environment. The inner turret mooring system allows the FPSO to rotate around the inner turret to produce a weathervane effect, so that the bow of the FPSO always faces the direction with the smallest combined force of environmental loads. The mooring force provided by the inner turret can relatively fix the FPSO at the offshore oil field operation site; Since the FPSO hull is always subjected to the load of the marine environment, the hull load is transmitted to the inner turret through the bearing, wherein the vertical load is transmitted through the axial bearing, and the horizontal load is transmitted through the radial bearing. The slip ring is installed on the inner turret and is in direct contact with the bearing installed on the hull, so that it can rotate relatively and transmit the force of the bearing to the inner turret. The service life of FPSO is long, and the long-term impact and vibration of the environmental load may cause the wear of the slip ring, which in turn affects the mooring safety of FPSO. In order to ensure the relative rotation between the hull and the inner turret, the installation or repair accuracy of the slip ring is very high, and its outer ring generally needs to be machined to ensure the overall accuracy. The slip ring is located at the upper and lower ends of the inner turret, with a height difference of more than 30 meters. Conventional machining methods make it difficult to machine the upper and lower slip rings. In order to solve the above problems, a new slip ring repair and machining technology solution is needed. Summary of the invention

[0003] The object of the present invention is to provide a method for repairing and machining an inner turret slip ring which can ensure the slip ring accuracy.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a method for repairing and machining an inner turret slip ring, comprising the following steps: Step 1: Design the lifting lugs according to the weight and center of gravity information of the inner turret, select the floating hook for lifting, install four lifting lugs on the upper part of the inner turret, and perform flaw detection; Step 2: Install four precision control cross reinforcements inside the inner turret, mark the center position, perform precision measurement, and record the precision data; Step 3: Perform preparatory work, clean the inner turret area, and remove the connection facilities between the inner turret and the floating production storage and offloading unit; Step 4: Place the inner turret support piers at the upper part and the lower part of the inner turret at the wharf, and measure the upper surface of the inner turret support piers accurately to ensure the horizontality; Step 5: Use the floating crane hook to load the inner turret crane out of the floating production storage and offloading unit, drop it onto the inner turret support pier of the wharf and fix it; Step 6: Cut the inner turret into two parts at the middle of the inner turret; Step 7: hoist the upper part of the inner turret onto the inner turret support pier placed on the dock and fix it; Step 8: Weld and repair the damaged areas of the upper and lower sliding rings; Step 9: Install a machining rotating platform, a machining arm, a stabilizing wheel, a slide rail, a precision measuring device, a balancing weight, a working platform, and a machining cutting device on the upper part of the inner turret; Step 10: Install a temporary support platform, a machining rotating platform, a machining arm, a stabilizing wheel, a slide rail, a precision measuring device, a balancing weight, a working platform, and a machining cutting device above the lower part of the inner turret; Step 11, simultaneously measure the accuracy data of the upper part of the inner turret and the lower part of the inner turret to determine the machining amount; Step 12: Adjust the machining and cutting equipment according to the precision data, and process the upper and lower sliding rings respectively; Step 13, hoist the upper part of the inner turret to the top of the lower part of the inner turret, adjust the position according to the measurement accuracy data before dismantling, and weld the joints between the upper part of the inner turret and the lower part of the inner turret in accordance with the welding sequence for slip ring repair; Step 14: Install the inner swivel crane back to the floating production storage and offloading unit.

[0005] In the step 2, precision-controlled cross reinforcements are installed at the upper and lower sliding ring positions of the inner turret and at the upper and lower ends near the cutting position.

[0006] In step 8 and step 12, the upper and lower slip rings are an upper radial slip ring, an upper axial slip ring and a lower radial slip ring.

[0007] In step 8, the damaged areas of the upper and lower sliding rings are replaced as a whole.

[0008] In the step 12, the upper and lower sliding rings are machined and then the upper and lower sliding ring data are measured again.

[0009] The invention discloses a method for repairing and machining a slip ring of an inner turret. By designing a hoisting scheme, a supporting scheme, a cutting scheme, a slip ring repair scheme and a slip ring machining scheme, the method can meet the needs of repairing and machining the upper and lower slip rings of the inner turret, and can extend the service life of the inner turret to a certain extent, thereby ensuring the mooring safety of a floating production storage and offloading unit (FPSO). BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The invention discloses an inner turret hoisting diagram of an inner turret slip ring repair and machining method.

[0011] Figure 2 The invention discloses a schematic diagram of inner turret cutting of an inner turret slip ring repair and machining method.

[0012] Figure 3 The invention discloses a schematic diagram of machining the inner turret upper slip ring of a method for repairing and machining an inner turret slip ring.

[0013] Figure 4 The invention discloses a schematic diagram of machining the inner turret lower slip ring of a method for repairing and machining an inner turret slip ring.

[0014] Figure 5 It is a schematic diagram of enhanced precision control of an inner turret slip ring repair and machining method of the present invention.

[0015] Figure 6 The invention discloses a schematic diagram of an inner turret slip ring welding repair method according to the present invention.

[0016] In the figure: 1. Floating crane hook; 2. Lifting rigging; 3. Lifting lug; 4. Inner turret; 5. Upper part of inner turret; 6. Lower part of inner turret; 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 rotating platform; 16. Temporary support platform; 17. Balancing weight; 18. Working platform; 19. Machining cutting equipment; 20. Inner turret support pier. DETAILED DESCRIPTION

[0017] like Figures 1 to 6 As shown, the inner turret slip ring repair and machining method, such as Figure 1 , Figure 5 As shown, the hoisting and precision control reinforcement installation, step 1, design the hoisting lug 3 according to the weight, center of gravity and other information of the inner turret 4, select the floating hook 1 for hoisting, install four hoisting lugs 3 on the upper part 5 of the inner turret, and perform flaw detection; step 2, install four cross-shaped precision control reinforcements 10 at the upper radial slip ring 7, upper axial slip ring 8 and lower radial slip ring 9 inside the inner turret 4 and at the upper and lower ends near the cutting position, mark the center position, perform precision measurement, and record precision data; step 3, perform preparatory work, clean the inner turret area, and dismantle the piping, electrical and other connection facilities between the inner turret and the floating production storage and offloading unit (FPSO); as shown Figure 2As shown, the inner turret support and cutting, step 4, arrange the inner turret support pier 20 of the inner turret upper part 5 and the inner turret lower part 6 in advance at the dock, and measure the upper surface of the inner turret support pier 20 accurately to ensure the horizontality; step 5, use the floating crane hook 1 and the lifting rigging 2 to lift the inner turret out of the floating production storage and offloading unit (FPSO), drop it on the inner turret support pier 20 of the dock and fix it; step 6, draw a line and cut in the middle position of the inner turret to cut the inner turret into two parts, upper and lower; step 7, lift the inner turret upper part 5 to the inner turret support pier 20 placed on the dock and fix it; as shown Figure 6 As shown, the slip ring is repaired, step 8, check the status of the upper radial slip ring 7, the upper axial slip ring 8 and the lower radial slip ring 9, measure the data, and perform welding repair or overall replacement of the damaged areas of the upper radial slip ring 7, the upper axial slip ring 8 and the lower radial slip ring 9 in the order shown in the figure. The relative positions are constructed at the same time during welding; Figure 3 , 4 As shown, the slip ring is machined, step 9, install the machining rotating platform 15, the machining arm 12, the stabilizing wheel 13, the slide rail 14, the precision measuring device 11, the balancing weight 17, the working platform 18, and the machining cutting device 19 above the inner turret upper part 5; step 10, install the temporary support platform 16, the machining rotating platform 15, the machining arm 12, the stabilizing wheel 13, the slide rail 14, the precision measuring device 11, the balancing weight 17, the working platform 18, and the machining cutting device 19 above the inner turret lower part 6; step 11, simultaneously measure the precision data of the inner turret upper part 5 and the inner turret lower part 6, determine the machining amount, and adjust the position of the machining equipment; step 12, adjust the machining cutting equipment according to the precision data, and process the upper radial slip ring 7, the upper axial slip ring 8 and the lower radial slip ring 9 respectively, and measure the slip ring data again after machining; the inner turret is reinstalled, step 13, The inner turret upper part 5 is hoisted above the inner turret lower part 6, and the position is adjusted according to the measurement accuracy data before dismantling, and the interface between the inner turret upper part 5 and the inner turret lower part 6 is welded with reference to the slip ring repair welding sequence; step 14, hoisting the inner turret as a whole back to the floating production storage and offloading device; the inner turret slip ring repair and machining method of the present invention hoists the inner turret from the floating production storage and offloading device (FPSO) hull to the dock support pier, cuts the inner turret into upper and lower parts from the middle of the inner turret, and then hoists the upper part to the dock support pier, and then repairs the upper and lower slip rings respectively, and then machines the slip rings after repair, and by designing the hoisting scheme, the support scheme, the cutting scheme, the slip ring repair scheme, and the slip ring machining scheme, the repair and machining of the upper and lower slip rings of the inner turret can be met, the service life of the inner turret can be extended to a certain extent, and the mooring safety of the floating production storage and offloading device (FPSO) can be ensured.

Claims

1. A method for repairing and machining an inner turret slip ring, characterized in that: The following steps are involved: Step 1: Design the lifting lugs according to the weight and center of gravity information of the inner turret, select the floating hook for lifting, install four lifting lugs on the upper part of the inner turret, and perform flaw detection; Step 2: Install four precision control cross reinforcements inside the inner turret, mark the center position, perform precision measurement, and record the precision data; Step 3: Perform preparatory work, clean the inner turret area, and remove the connection facilities between the inner turret and the floating production storage and offloading unit; Step 4: Place the inner turret support piers at the upper part and the lower part of the inner turret at the wharf, and measure the upper surface of the inner turret support piers accurately to ensure the horizontality; Step 5: Use the floating crane hook to load the inner turret crane out of the floating production storage and offloading unit, drop it onto the inner turret support pier of the wharf and fix it; Step 6: Cut the inner turret into two parts at the middle of the inner turret; Step 7: hoist the upper part of the inner turret onto the inner turret support pier placed on the dock and fix it; Step 8: Weld and repair the damaged areas of the upper and lower sliding rings; Step 9: Install a machining rotating platform, a machining arm, a stabilizing wheel, a slide rail, a precision measuring device, a balancing weight, a working platform, and a machining cutting device on the upper part of the inner turret; Step 10: Install a temporary support platform, a machining rotating platform, a machining arm, a stabilizing wheel, a slide rail, a precision measuring device, a balancing weight, a working platform, and a machining cutting device above the lower part of the inner turret; Step 11, simultaneously measure the accuracy data of the upper part of the inner turret and the lower part of the inner turret to determine the machining amount; Step 12: Adjust the machining and cutting equipment according to the precision data, and process the upper and lower sliding rings respectively; Step 13, hoist the upper part of the inner turret to the top of the lower part of the inner turret, adjust the position according to the measurement accuracy data before dismantling, and weld the joints between the upper part of the inner turret and the lower part of the inner turret in accordance with the welding sequence for slip ring repair; Step 14: Install the inner swivel crane back to the floating production storage and offloading unit.

2. The inner turret slip ring repair and machining method according to claim 1, characterized in that: In the step 2, precision-controlled cross reinforcements are installed at the upper and lower sliding ring positions of the inner turret and at the upper and lower ends near the cutting position.

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

4. The inner turret slip ring repair and machining method according to claim 1, characterized in that: In step 8, the damaged areas of the upper and lower sliding rings are replaced as a whole.

5. The inner turret slip ring repair and machining method according to claim 1, characterized in that: In the step 12, the upper and lower sliding rings are machined and then the upper and lower sliding ring data are measured again.

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