Rapid installation method for vertical pipe flange

Abstract

The invention discloses a quick mounting method for vertical pipe flanges, which comprises the following steps of: carrying out primary alignment arrangement on a vertical pipe rotating flange and a vertical pipe butt welding flange by utilizing a lever block, carrying out primary fixing on flange butt joint bolts of a rear fixing part, further calibrating the two flanges by utilizing the lever block, and mounting all the rest flange butt joint bolts; and after the flange butt joint concentricity is measured and adjusted to a proper position through the flange concentricity adjuster, all flange butt joint bolts are pre-tightened and fastened. The scheme has the beneficial effects that the defects in the prior art are overcome, the positions of the vertical pipe and the pipe clamp do not need to be repeatedly adjusted, the invalid working time is greatly shortened, and the efficiency is improved; the method is suitable for diving operation with limited diving operation time, such as helium-oxygen mixed gas diving, and special tools such as a flange centralizer and a positioning pin are not needed; the positions of the vertical pipe and the pipe clamp do not need to be repeatedly adjusted.

Description

Technical Field

[0001] The present invention relates to the technical field of construction of underwater devices in oil fields, and more specifically to a method for rapid installation of riser flanges. Background Art

[0002] With the continuous development of marine resources and the continuous progress of technology, the construction and development of oil platforms have continuously expanded into deeper waters. The diving services used in underwater installation operations have evolved from air diving to surface-supplied (helium-oxygen) mixed gas diving and saturation diving;

[0003] The operating depth of the surface-supplied air diving operation mode is: within 0 - 60m according to national standards and within 0 - 57m according to the International Diving Contractors Association; the operating depth of the surface-supplied (helium-oxygen) mixed gas diving operation mode is: within 120m according to national standards and within 90m according to the International Diving Contractors Association; the operating depth of the saturation diving operation mode is: within 300m.

[0004] When the operating depth exceeds that of air diving operations, underwater installation operations can only choose surface-supplied (helium-oxygen) mixed gas diving or saturation diving; the surface-supplied (helium-oxygen) mixed gas diving operation mode has the advantages of relatively low equipment requirements, fewer requirements, quick conversion of operating depth levels, low cost, less site restrictions, fast mobilization speed, low cost, and a streamlined organizational structure of the operation team compared to the saturation diving operation mode. However, its disadvantages are short operation time, low efficiency, high risk, being greatly affected by weather and sea currents, and limited operating depth.

[0005] The butt joint installation of underwater pipeline flanges is divided into the flange butt joint of the horizontal pipe section and the flange butt joint of the riser section. Since the flange butt joint installation of the horizontal pipe section is on the seabed, with flat terrain, few obstacles, and the pipeline not restricted by external forces, the pipeline has a large adjustable range and is easy to install. Flange position limiters and positioning pins can be selected as auxiliary tools for flange butt joint installation to assist in completing the installation. For the newly added riser flange butt joint installation, due to factors such as the accuracy deviation of the installation position of the riser pipe clamp, the slope of the platform jacket, the original structure of the platform jacket, and the limitation of the adjustable direction of the riser pipeline, when using flange butt joint limiters and positioning pins for auxiliary installation during riser flange butt joint, the riser, pipe clamp, etc. need to be adjusted repeatedly; and after the riser flange butt joint is completed, due to the existence of a movable gap in the rotating flange, it is extremely easy to cause the flange sealing gasket to fail to correctly enter the groove, resulting in an edge bite phenomenon, and ultimately leading to the failure of the flange butt joint.

[0006] The traditional riser installation method completes the matching butt joint of the riser flange by repeatedly adjusting the positions of the riser and the pipe clamp; and this operation mode of repeatedly adjusting the positions of the riser and the pipe clamp will surely increase the underwater operation time and workload, thereby prolonging the construction period, increasing risks and costs, etc. Summary of the Invention

[0007] The present invention overcomes the deficiencies in the prior art and provides a method for quickly installing a riser flange.

[0008] The object of the present invention is achieved by the following technical solutions.

[0009] A method for quickly installing a riser flange, the specific steps including:

[0010] S1. After adjusting the riser rotating flange and the riser butt-welding flange to a butt-jointable spacing, according to the horizontal offset position of the bolt holes of the riser rotating flange and the riser butt-welding flange, pass the chain part of the hand winch through the corresponding bolt holes of the riser rotating flange and the riser butt-welding flange;

[0011] S2. Install the chain part of the hand winch in a staggered manner, use the chain part of the hand winch to adjust the horizontal deviation position of the riser rotating flange and the riser butt-welding flange, align the central axes of some bolt holes of the riser rotating flange and the riser butt-welding flange, and install flange butt-joint bolts in the aligned bolt holes;

[0012] S3. Remove the installed chain part of the hand winch, observe the position of each remaining group of bolt holes again, repeat step S1, and pass the chain part of the hand winch through between the two bolt holes in a staggered manner;

[0013] S4. Use the chain part of the hand winch to adjust the horizontal deviation position of the riser rotating flange and the riser butt-welding flange, adjust some corresponding bolt holes of the remaining riser rotating flange and the riser butt-welding flange to an aligned state, set flange butt-joint bolts. When the installation quantity of the flange butt-joint bolts reaches half of the total quantity, install the sealing gasket into the flange sealing gasket groove provided on the riser butt-welding flange, repeat steps S1 and S2, and complete the installation of other flange butt-joint bolts except the bolt holes affected by the chain part of the hand winch;

[0014] S5. Remove the chain part of the hand winch, install the remaining flange butt-joint bolts. After all the flange butt-joint bolts are installed, slowly lower the riser through a winch, adjust the spacing between the riser rotating flange and the riser butt-welding flange by adjusting the tightness of each flange butt-joint bolt. When the upper end face of the sealing ring initially enters the flange sealing gasket groove of the riser rotating flange, use a vernier caliper to measure the distance from the outer circumferential end face of the riser rotating flange to the outer circumferential face of the sealing gasket and the distance from the outer circumferential end face of the riser butt-welding flange to the outer circumferential face of the sealing gasket, and measure a total of 8 groups of data at 12 o'clock, 3 o'clock, 6 o'clock, and 9 o'clock positions of the clock;

[0015] S6. According to the data obtained from the concentricity measurement in S5, select the bolt holes at the corresponding positions, remove the flange docking bolts set in the bolt holes at two corresponding angles to install the flange concentricity adjuster, and adjust the concentricity of the riser rotating flange and the riser butt-welding flange by adjusting the flange concentricity adjuster. After the concentricity is adjusted, lower the riser rotating flange so that the sealing washer set in the flange gasket groove of the riser butt-welding flange in S4 correctly enters the flange sealing ring groove of the riser rotating flange;

[0016] S7. Use a vernier caliper to measure the flange concentricity. When it is confirmed that the concentricity meets the standard, use a ratchet wrench to pre-tighten the flange docking bolts except for the flange concentricity adjuster, remove the flange concentricity adjuster, install the flange docking bolts and use a ratchet wrench to pre-tighten them;

[0017] S8. After pre-tightening all the set flange docking bolts, install a hydraulic tensioner to tighten the bolts.

[0018] The two flange docking bolts removed in S6 are arranged at 90°.

[0019] In S7, the butt-welding flange bolts are pre-tightened by the method of diagonal pre-tightening.

[0020] A limit baffle is provided on the chain part of the hand winch. A chain fixing groove is provided on the limit baffle. The chain part of the hand winch is arranged in the chain fixing groove. A fixing pin and a fixing lock hole are provided on the limit baffle, and the fixing pin and the fixing lock hole are arranged in cooperation.

[0021] The limit baffle is in a C-shaped structure.

[0022] The flange concentricity adjuster includes a connecting body, a fixing rod and an adjusting screw rod. The fixing rod is fixedly connected with the connecting body, the adjusting screw rod is connected with the connecting body by threads, and the fixing rod and the adjusting screw rod are arranged at a 90° angle.

[0023] A fixing seat is fixedly provided at the tail end of the vernier caliper. The fixing seat is fixedly connected with the vernier caliper at a 90° angle, and a magnetic suction base is provided on the fixing seat.

[0024] The beneficial effects of the present invention are:

[0025] The method is simple and efficient: there is no need to repeatedly adjust the positions of the riser and the pipe clamp, which greatly reduces the ineffective working time and improves the efficiency;

[0026] Construction resources: Compared with saturation diving operations, helium-oxygen mixed gas diving does not require supporting facilities such as saturation operation support vessels and saturation diving equipment, and does not require special tools such as flange aligners and positioning pins;

[0027] Safety: The present invention does not require repeated adjustment of the positions of the riser pipe and the pipe clamp, reducing the hoisting risk; at the same time, it reduces the safety risk of divers using different proportions of helium-oxygen mixture due to different working water depths.

[0028] Construction cost: It does not require the implementation of saturation operation support and saturation diving, shortening the operation period and the usage of helium-oxygen mixture, and greatly reducing the construction cost.

[0029] In summary, the present invention can greatly reduce the construction cost, requires less construction resources, has high construction efficiency; and greatly reduces the construction safety risk. Description of the drawings

[0030] Figure 1 It is a schematic diagram of the steps of Scheme S1;

[0031] Figure 2 It is a schematic diagram of the steps of hole selection in Scheme S2;

[0032] Figure 3 It is an overlapping schematic diagram of hole selection in Scheme S2;

[0033] Figure 4 It is a schematic diagram of measuring the concentricity of the flange with a vernier caliper in S5;

[0034] Figure 5 It is a schematic diagram of the structure of the flange adjuster in S6;

[0035] Figure 6 It is a schematic diagram of the setting of the flange adjuster in S6;

[0036] Figure 7 It is a schematic diagram of the setting of the lever hoist and the limit baffle;

[0037] Figure 8 It is a schematic diagram of the structure of the limit baffle;

[0038] Figure 9 It is a schematic diagram of the structure of the vernier caliper;

[0039] In the figure: 1. Riser rotating flange; 2. Riser butt-welding flange; 3. Bolt hole; 4. Hand lever hoist; 5. Flange gasket groove; 6. Vernier caliper; 61. Fixed seat; 62. Magnetic suction base; 7. Flange concentricity adjuster; 71. Connection main body; 72. Fixed rod; 73. Adjusting screw; 8. Limit baffle; 81. Chain fixing groove; 82. Fixed plug; 83. Fixed lock hole. Specific implementation mode

[0040] Embodiment

[0041] A method for quickly installing a riser flange, the specific steps include:

[0042] S1. After adjusting the riser rotating flange 1 and the riser butt welding flange 2 to a butt - connectable distance, according to the horizontal offset position of the bolt holes 3 of the riser rotating flange 1 and the riser butt welding flange 2, pass the chain part of the hand - operated hoist 4 through the corresponding bolt holes 3 of the riser rotating flange 1 and the riser butt welding flange 2.

[0043] As Figure 1 shown, in S1, the riser rotating flange 1 and the riser butt welding flange 2 are preliminarily fixed by passing the chain part of the hand - operated hoist 4 through the bolt holes 3.

[0044] Furthermore, as Figure 2 and Figure 3 shown, number and mark the bolt holes 3 of the riser rotating flange 1 and the riser butt welding flange 2, and observe the position of each group of flange bolt holes 3. In this embodiment, observe the position of the No. 1 bolt hole 3 of the riser rotating flange 1 and the No. 1 bolt hole 3 of the riser butt welding flange 2.

[0045] According to the horizontal offset position of the bolt holes 3 of the riser rotating flange 1 and the riser butt welding flange 2, pass the chain part of the hand - operated hoist 4 through the corresponding bolt holes 3 of the riser rotating flange 1 and the riser butt welding flange 2.

[0046] As Figure 3 shown, the central axis offset of the No. 1 bolt hole 3 of the riser rotating flange 1 and the No. 1 bolt hole 3 of the riser butt welding flange 2 is the smallest. When the central axis of the No. 1 bolt hole 3 of the riser rotating flange 1 is at 7 o'clock on the clock position of the central axis of the No. 1 bolt hole 3 of the riser butt welding flange 2, the chain parts of the hand - operated hoist 4 pass through the No. 3 hole of the riser rotating flange 1 and the No. 5 hole of the riser butt welding flange 2 respectively; when the center of the No. 1 bolt hole of the riser rotating flange 1 is at 2 o'clock on the clock position of the central axis of the No. 1 bolt hole of the riser butt welding flange 2, the chain parts of the hand - operated hoist 4 pass through the No. 5 hole of the riser rotating flange 1 and the No. 3 hole of the riser butt welding flange 2 respectively.

[0047] Furthermore, as Figure 7 and Figure 8 shown, a limit baffle 8 is provided on the chain part of the hand - operated hoist 4. A chain fixing groove 81 is provided on the limit baffle 8. The chain part of the hoist is arranged in the chain fixing groove 81. A fixing bolt 82 and a fixing lock hole 83 are provided on the limit baffle 8, and the fixing bolt 82 and the fixing lock hole 83 are arranged in cooperation. Preferably, the fixing bolt 82 is preferably a spring bolt for better effect.

[0048] In this solution, in order to make the chain part of the hand - operated hoist 4 better bear force, it is improved. It is limited by the limit baffle 8 to keep a limited state with the bolt hole 3. Among them, the chain fixing groove 81 is used to cooperate with the chain part, and by inserting the fixing bolt 82 into the fixing lock hole 83 for fixing, the limit baffle 8 is nested on the chain part for limiting use.

[0049] Preferably, the limit baffle 8 has a C-shaped structure.

[0050] S2. Dislocate and install the chain part of the hand winch 4, and use the chain part of the hand winch 4 to adjust the horizontal deviation position of the riser rotating flange 1 and the riser butt-welding flange 2, so that the central axes of some bolt holes 3 of the riser rotating flange 1 and the riser butt-welding flange 2 are aligned, and install flange docking bolts in the aligned bolt holes 3.

[0051] As Figure 2 shown, in this embodiment, the 18th bolt hole 3 is selected for the riser rotating flange, and the 20th bolt hole 3 is selected for the riser butt-welding flange 2. The chain part of the hand winch 4 passes through and is tightened to achieve the preliminary alignment of the riser rotating flange 1 and the riser butt-welding flange 2.

[0052] S3. Remove the chain part of the installed hand winch 4, observe the position of each remaining group of bolt holes 3 again, repeat step S1, and dislocate the chain part of the hand winch 4 through between the two bolt holes 3.

[0053] S4. Use the chain part of the hand winch 4 to adjust the horizontal deviation position of the riser rotating flange 1 and the riser butt-welding flange 2. After adjusting the corresponding bolt holes of the remaining riser rotating flange 1 and the riser butt-welding flange 2 to the aligned state, set flange docking bolts. When the installation quantity of the flange docking bolts reaches half of the total quantity, install the sealing washer into the flange sealing washer groove 5 provided on the riser butt-welding flange 2, and repeat steps S1 and S2 to complete the installation of other flange docking bolts except for the bolt holes 3 affected by the chain part of the hand winch 4.

[0054] S5. Remove the chain part of the hand winch 4 and install the remaining flange docking bolts. After all the flange docking bolts are installed, slowly lower the riser through the winch, adjust the distance between the riser rotating flange 1 and the riser butt-welding flange 2 by adjusting the tightness of each flange docking bolt. When the upper end face of the sealing ring initially enters the flange sealing washer groove 5 of the riser rotating flange 1, use the vernier caliper 6 to measure the distance from the outer circumferential end face of the riser rotating flange 1 to the outer circumferential face of the sealing washer and the distance from the outer circumferential end face of the riser butt-welding flange 2 to the outer circumferential face of the sealing washer, and measure a total of 8 groups of data at 12 o'clock, 3 o'clock, 6 o'clock, and 9 o'clock positions of the clock respectively.

[0055] As Figure 4 shown, measure the concentricity of the flange docking through the vernier caliper 6.

[0056] Furthermore, as Figure 9 shown, a fixed seat 61 is fixedly provided at the tail end of the vernier caliper 6, the fixed seat 61 is fixedly connected to the vernier caliper 6 at a 90° angle, and a magnetic suction base 62 is provided on the fixed seat 61.

[0057] For the convenience of its underwater operation, this solution improves the vernier caliper 6. By setting a fixed seat 61 and a magnetic base 62 on the fixed seat 61, the vernier caliper 6 can be detachably connected to the flange, and is fixed by magnetic attraction during use. After being fixed, the vernier caliper 6 can be stably connected to the flange, facilitating use.

[0058] S6. According to the data obtained from the concentricity measurement in S5, select the bolt holes 3 at the corresponding positions, remove the flange docking bolts arranged in the bolt holes 3 at two corresponding angles, in order to install the flange concentricity adjuster 7. Adjust the concentricity of the riser rotary flange 1 and the riser butt-weld flange 2 by adjusting the flange concentricity adjuster 7. After the concentricity is adjusted, lower the riser rotary flange 1 so that the sealing washer arranged in the flange gasket groove 5 of the riser butt-weld flange 2 in S4 correctly enters the flange sealing ring groove of the riser rotary flange 1.

[0059] As Figure 5 shown, the flange concentricity adjuster 7 includes a connecting body 71, a fixing rod 72 and an adjusting screw rod 73. The fixing rod 72 is fixedly connected to the connecting body 71, the adjusting screw rod 73 is connected to the connecting body 71 by threads, and the fixing rod 72 and the adjusting screw rod 73 are arranged at a 90° angle.

[0060] This solution improves the flange concentricity adjuster 7. It is fixed by using the fixing rod 72 arranged in the bolt hole 3, and the concentricity is adjusted by squeezing the flange by adjusting the distance of the adjusting screw rod 73.

[0061] As Figure 6 shown, the two flange docking bolts removed in S6 are arranged at a 90° angle. By arranging the flange concentricity adjuster 7 in the two bolt holes 3 with an included angle of 90°, the concentricity can be adjusted better.

[0062] S7. Use the vernier caliper 6 to measure the flange concentricity. When it is confirmed that the concentricity meets the standard, use a ratchet wrench to pre-tighten the flange docking bolts except for the flange concentricity adjuster, remove the flange concentricity adjuster 7, install the flange docking bolts and use a ratchet wrench to pre-tighten them.

[0063] S8. After pre-tightening all the set flange docking bolts, install a hydraulic tensioner to tighten the bolts.

[0064] Preferably, the docking flange bolts in S7 are pre-tightened by the method of diagonal pre-tightening.

[0065] The above has described the embodiments of the present invention in detail, but the described content is only the preferred embodiments of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A rapid installation method for a riser flange, characterized in that, The specific steps are as follows: S1. After adjusting the riser rotating flange and the riser butt-welding flange to a butt-jointable spacing, according to the horizontal offset position of the bolt holes of the riser rotating flange and the riser butt-welding flange, pass the chain part of the hand winch through the corresponding bolt holes of the riser rotating flange and the riser butt-welding flange; S2. Install the chain part of the hand winch in a staggered manner, use the chain part of the hand winch to adjust the horizontal deviation position of the riser rotating flange and the riser butt-welding flange, align the central axes of some bolt holes of the riser rotating flange and the riser butt-welding flange, and install flange butt-joint bolts in the aligned bolt holes; S3. Remove the installed chain part of the hand winch, observe the position of each remaining group of bolt holes again, repeat step S1, and pass the chain part of the hand winch through between the two bolt holes in a staggered manner; S4. Use the chain part of the hand winch to adjust the horizontal deviation position of the riser rotating flange and the riser butt-welding flange, adjust some corresponding bolt holes of the remaining riser rotating flange and the riser butt-welding flange to an aligned state, set flange butt-joint bolts. When the installation quantity of the flange butt-joint bolts reaches half of the total quantity, install the sealing washer into the flange sealing washer groove provided on the riser butt-welding flange, repeat the steps of S1 and S2 to complete the installation of other flange butt-joint bolts except for the bolt holes affected by the chain part of the hand winch; S5. Remove the chain part of the hand winch, install the remaining flange butt-joint bolts. After all the flange butt-joint bolts are installed, slowly lower the riser through the winch, adjust the spacing between the riser rotating flange and the riser butt-welding flange by adjusting the tightness of each flange butt-joint bolt. When the upper end face of the sealing ring initially enters the flange sealing washer groove of the riser rotating flange, use a vernier caliper to measure the distance from the outer circumferential end face of the riser rotating flange to the outer circumferential face of the sealing washer and the distance from the outer circumferential end face of the riser butt-welding flange to the outer circumferential face of the sealing washer, and measure a total of 8 groups of data at 12 o'clock, 3 o'clock, 6 o'clock, and 9 o'clock positions of the clock; S6. According to the data obtained from the concentricity measurement in S5, select the bolt holes at the corresponding positions, remove the flange butt-joint bolts set in the bolt holes at two corresponding angles to install the flange concentricity adjuster, adjust the concentricity of the riser rotating flange and the riser butt-welding flange by adjusting the flange concentricity adjuster. After the concentricity is adjusted, lower the riser rotating flange so that the sealing washer set in the flange sealing washer groove of the riser butt-welding flange in S4 correctly enters the flange sealing ring groove of the riser rotating flange; S7. Use a vernier caliper to measure the flange concentricity. When it is confirmed that the concentricity reaches the standard, use a ratchet wrench to pre-tighten the flange butt-joint bolts except for the flange concentricity adjuster, remove the flange concentricity adjuster, install the flange butt-joint bolts and use a ratchet wrench to pre-tighten them; S8. After pre-tightening all the set flange butt-joint bolts, install a hydraulic tensioner to tighten the bolts.

2. The quick installation method of a riser flange according to claim 1, characterized in that: The two flange butt-joint bolts removed in S6 are set at 90°.

3. A rapid installation method for a riser flange according to claim 1, characterized in that: In S7, the butt-joint flange bolts are pre-tightened by the method of diagonal pre-tightening.

4. A rapid installation method for a riser flange according to claim 1, characterized in that: A limit baffle is provided on the chain part of the hand winch. A chain fixing groove is provided on the limit baffle. The chain part of the hand winch is arranged in the chain fixing groove. A fixing pin and a fixing lock hole are provided on the limit baffle, and the fixing pin and the fixing lock hole are arranged in cooperation.

5. A quick installation method for a riser flange according to claim 4, characterized in that: The limit baffle is in a C-shaped structure.

6. A method for quickly installing a riser flange according to claim 1, characterized in that: The flange concentricity adjuster includes a connecting body, a fixing rod and an adjusting screw rod. The fixing rod is fixedly connected to the connecting body, the adjusting screw rod is connected to the connecting body by threads, and the fixing rod and the adjusting screw rod are arranged at an angle of 90°.

7. A rapid installation method for a riser flange according to claim 1, characterized in that: A fixing seat is fixedly provided at the tail end of the vernier caliper. The fixing seat is fixedly connected to the vernier caliper at 90°, and a magnetic suction base is arranged on the fixing seat.

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