Submarine pipeline pressure test leak hunting device

Abstract

The utility model discloses a pressure test leak hunting device for a subsea pipeline. The pressure test leak hunting device comprises a pressurizing mechanism and a plugging mechanism. According to the subsea pipeline pressure test leak hunting device, a pressurization mechanism and a plugging mechanism are connected to the two ends of a subsea pipeline respectively, a piston plate matched with a buffer box is slidably connected into the buffer box, the top face of the piston plate is fixedly connected with a spring, and a pressure relief hole is formed in the side wall of the middle of the buffer box; a connecting pipe is fixedly connected to an opening in the bottom of the buffer box, a first plugging flange is fixedly connected to the bottom end of the connecting pipe, the first plugging flange and the corresponding mounting flange are fixedly mounted through a bolt, and a spring extrudes a piston plate to form a buffer cavity in the buffer box; and a buffer cavity formed by the piston plate in the buffer box generates capacity expansion buffer until the piston plate is flush with the pressure relief hole, and direct pressure relief is performed, so that the subsea pipeline spalling damage caused by overlarge pressure in the pressurizing process of the pressurizing mechanism is effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline pressure test leak hunting technical field, specifically a kind of submarine pipeline pressure test leak hunting device. BACKGROUND

[0002] At present, the method for submarine pipeline pressure test leak hunting is as follows: after filling submarine pipeline with water, start to pressurize submarine pipeline using pressure test pump, in the process of pressurizing operation, release residual air in pipe by opening needle valve on pipe end blind plate, to ensure that air content in pipe meets submarine pipeline pressure test requirement. When the pressure in submarine pipeline reaches design pressure, stop pressurizing, and start to enter submarine pipeline pressure stabilization stage. The pressure stabilization time is at least 24 hours, if the pressure change in submarine pipeline within 24 hours is within acceptable range, it indicates that submarine pipeline does not exist leakage, and pressure test result is acceptable.

[0003] In the above prior art, although submarine pipeline pressure test leak hunting can be conveniently realized, but directly pressurizing submarine pipeline, pressure is prone to be too large, and pipe expansion cracking problem occurs, therefore, a kind of submarine pipeline pressure test leak hunting device is proposed to facilitate submarine pipeline pressure test leak hunting. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of submarine pipeline pressure test leak hunting device to solve the problems raised in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A kind of submarine pipeline pressure test leak hunting device, including pressurizing mechanism and plugging mechanism, the pressurizing mechanism and plugging mechanism are connected at the two ends of submarine pipeline respectively, the two ends of submarine pipeline are connected with the installation flange connected with pressurizing mechanism and plugging mechanism, plugging mechanism includes buffer tank, the bottom opening of buffer tank is fixedly connected with connecting pipe, the bottom end of connecting pipe is fixedly connected with first plugging flange, first plugging flange is fixedly installed by bolt with corresponding installation flange, first plugging flange and installation flange are all provided with circular hole for bolt penetration, the threaded end of bolt is threadedly connected with nut, pressure gauge is fixedly installed on one side of connecting pipe, exhaust valve is fixedly installed on the other side of connecting pipe, buffer tank is slidably connected with piston plate matched therewith in, the top surface of piston plate is fixedly connected with spring, pressure relief hole is formed in the middle side wall of buffer tank.

[0007] As a further scheme of the utility model: the pressurizing mechanism includes pressure pump, the water inlet end of pressure pump is fixedly connected with water inlet pipe, the water outlet end of pressure pump is fixedly connected with water outlet pipe.

[0008] As a further scheme of the utility model: the end of the water outlet pipe is fixedly connected with a second plugging flange, the second plugging flange is fixedly installed through bolts and the corresponding installation flange, a round hole for bolt penetration is formed on the second plugging flange and the installation flange, the threaded end of the bolt is threadedly connected with a nut, and a stop valve is fixedly installed on the water outlet pipe.

[0009] As a further scheme of the utility model: the upper portion of the piston plate is provided with an adjusting plate, the spring is arranged between the adjusting plate and the piston plate, and the adjusting plate is slidingly connected in the buffer tank and is matched with the buffer tank.

[0010] As a further scheme of the utility model: a threaded handle is rotatably connected to the top of the buffer tank, the threaded handle is threadedly connected with the adjusting plate, a threaded hole for threadedly connecting the threaded handle is formed in the adjusting plate, the adjusting handle can be manually rotated or rotated through an electric tool, the top surface of the adjusting plate is symmetrically fixedly connected with guide rods, the guide rods slidingly penetrate the top of the buffer tank, and a round hole for the guide rods to penetrate and slide is formed in the top of the buffer tank.

[0011] As a further scheme of the utility model: a scale line is arranged on the outer wall of the guide rod, and the scale line corresponds to the compression amount of the spring.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] 1、 the utility model discloses a spring extrusion piston plate in the buffer tank forms a buffer cavity, when the pressure mechanism is pressurized, the buffer cavity formed in the buffer tank of the piston plate produces expansion buffering, until the piston plate is flush with the pressure relief hole, direct pressure relief is carried out, thereby effectively avoiding that the pressure is too large to cause the subsea pipeline to be expanded and cracked and damaged in the pressurizing process of the pressure mechanism.

[0014] 2、 the utility model discloses that the rotation of the threaded handle is matched with the guidance of the guide rod, so that the position of the adjusting plate in the buffer tank is adjusted, so that the compression amount of the spring can be controlled, and then the buffer limit pressure of the spring on the piston plate can be controlled. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 It is a structural schematic view of a subsea pipeline pressure test and leakage detection device.

[0016] Fig. 2 It is an enlarged view of A in a subsea pipeline pressure test and leakage detection device.

[0017] Fig. 3 It is a front view of a plugging mechanism in a subsea pipeline pressure test and leakage detection device.

[0018] In the figure: 1, pressurizing mechanism; 2, plugging mechanism; 3, submarine pipeline; 4, mounting flange; 5, buffer tank; 6, connecting pipe; 7, first plugging flange; 8, pressure gauge; 9, exhaust valve; 10, piston plate; 11, spring; 12, pressure relief hole; 13, pressurizing pump; 14, water inlet pipe; 15, water outlet pipe; 16, second plugging flange; 17, stop valve; 18, adjusting plate; 19, threaded handle; 20, guide rod; 21, scale line. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0020] Please refer to Figs. 1-3 In the embodiments of the utility model, a submarine pipeline pressure test and leakage detection device comprises a pressurizing mechanism 1 and a plugging mechanism 2, the pressurizing mechanism 1 and the plugging mechanism 2 are connected at two ends of a submarine pipeline 3 respectively, the two ends of the submarine pipeline 3 are connected with mounting flanges 4 connected with the pressurizing mechanism 1 and the plugging mechanism 2 respectively, the plugging mechanism 2 comprises a buffer tank 5, the bottom opening of the buffer tank 5 is fixedly connected with a connecting pipe 6, the bottom end of the connecting pipe 6 is fixedly connected with a first plugging flange 7, the first plugging flange 7 is fixedly installed with the corresponding mounting flange 4 through bolts, a circular hole for the bolts to pass through is formed in the first plugging flange 7 and the mounting flange 4, the threaded end of the bolt is threadedly connected with a nut, the pressure gauge 8 is fixedly installed on one side of the connecting pipe 6, the exhaust valve 9 is fixedly installed on the other side of the connecting pipe 6, the piston plate 10 matched with the buffer tank 5 is slidably connected in the buffer tank 5, the spring 11 is fixedly connected to the top surface of the piston plate 10, and the pressure relief hole 12 is formed in the middle side wall of the buffer tank 5.

[0021] The pressurizing mechanism 1 is used for water injection and pressurization of the submarine pipeline 3, the exhaust valve 9 is used for continuous exhaust during the water injection and pressurization of the submarine pipeline 3, until the air in the submarine pipeline 3 is exhausted, the spring 11 is used for extruding the piston plate 10 to form a buffer cavity in the buffer tank 5, when the pressurizing mechanism 1 is pressurized, the buffer cavity formed by the piston plate 10 in the buffer tank 5 produces expansion buffering until the piston plate 10 is flush with the pressure relief hole 12, and direct pressure relief is performed, so that the submarine pipeline 3 is effectively prevented from being damaged due to excessive pressure during the pressurization of the pressurizing mechanism 1.

[0022] The pressurizing mechanism 1 comprises a pressurizing pump 13, the pressurizing pump 13 is connected with a power supply and a switch, the water inlet pipe 14 is fixedly connected to the water inlet end of the pressurizing pump 13, the water inlet pipe 14 is directly connected in seawater, and the water outlet pipe 15 is fixedly connected to the water outlet end of the pressurizing pump 13.

[0023] The end of the water outlet pipe 15 is fixedly connected with a second plugging flange 16, the second plugging flange 16 is fixedly installed with the corresponding installation flange 4 through bolts, the second plugging flange 16 and the installation flange 4 are both provided with circular holes for bolt penetration, the threaded end of the bolt is threadedly connected with a nut, and the water outlet pipe 15 is fixedly installed with a stop valve 17.

[0024] The seawater is pumped out through the cooperation of the pressurizing pump 13 and the water inlet pipe 14, and is output into the submarine pipeline 3 through the water outlet pipe 15, and the water outlet pipe 15 is cut off through the stop valve 17, so that pressure maintaining is carried out.

[0025] The upper side of the piston plate 10 is provided with an adjusting plate 18, the spring 11 is arranged between the adjusting plate 18 and the piston plate 10, the adjusting plate 18 is slidingly connected in the buffer tank 5 and is matched with the buffer tank 5.

[0026] The top of the buffer tank 5 is rotatably connected with a threaded handle 19, the threaded handle 19 is threadedly connected with the adjusting plate 18, the adjusting plate 18 is provided with a threaded hole for threadedly connecting the threaded handle 19, the adjusting handle 19 can be manually rotated or rotated through an electric tool, the top surface of the adjusting plate 18 is fixedly connected with a guide rod 20 in a symmetrical mode, the guide rod 20 is slidingly connected with the top of the buffer tank 5, and the top of the buffer tank 5 is provided with a circular hole for the guide rod 20 to penetrate and slide.

[0027] The outer wall of the guide rod 20 is provided with a scale line 21, and the scale line 21 corresponds to the compression amount of the spring 11.

[0028] Through the rotation of the threaded handle 19 and the cooperation of the guide rod 20, the position of the adjusting plate 18 in the buffer tank 5 is adjusted, so that the compression amount of the spring 11 can be controlled, and then the buffer limit pressure of the spring 11 to the piston plate 10 can be controlled.

[0029] The working principle of the utility model is:

[0030] When in use, the pressurizing mechanism 1 and the sealing mechanism 2 are combined with the submarine pipeline 3, the first sealing flange 7 and the second sealing flange 16 are bolted on the installation flange 4, the water inlet pipe 14 is connected with the seawater pool, the stop valve 17 and the exhaust valve 9 are opened, at this time, the threaded handle 19 is rotated, the position of the adjusting plate 18 in the buffer box 5 is adjusted under the cooperation of the guide rod 20, the compression amount of the spring 11 is controlled through the scale line 21, the buffer limit pressure of the piston plate 10 is controlled, at this time, the seawater is pumped out through the water inlet pipe 14 under the cooperation of the pressurizing pump 13, and the seawater is output to the submarine pipeline 3 through the water outlet pipe 15, the air in the submarine pipeline 3 is exhausted through the exhaust valve 9 during the process of filling the seawater, until the air is exhausted, the exhaust valve 9 exhausts the water, at this time, the exhaust valve 9 is closed, the pressurizing pump 13 continues to work, at this time, the submarine pipeline 3 is continuously pressurized, the water is extruded to the piston plate 10, and the spring 11 is compressed, until the piston plate 10 slides to be flush with the pressure relief hole 12, at this time, the water is exhausted from the pressure relief hole 12, the water inlet and the water outlet are balanced, the pressurizing pump 13 is further closed and the stop valve 17 is closed, at this time, the piston plate 10 seals the pressure relief hole 12 under the action of the spring 11, so that the submarine pipeline 3 is pressure maintained, at this time, the pressure can be read through the pressure gauge 8, if the pressure change in the submarine pipeline within 24 hours is within an acceptable range, it is indicated that the submarine pipeline 3 does not leak, and the pressure test result is acceptable.

[0031] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A subsea pipeline pressure test leak detection apparatus comprising a pressurisation mechanism (1) and a plugging mechanism (2), characterised in that: The pressurizing mechanism (1) and the sealing mechanism (2) are connected at both ends of the submarine pipeline (3), and the submarine pipeline (3) is connected with the mounting flange (4) connected with the pressurizing mechanism (1) and the sealing mechanism (2) at both ends, the sealing mechanism (2) comprises a buffer tank (5), the bottom opening of the buffer tank (5) is fixedly connected with a connecting pipe (6), the bottom end of the connecting pipe (6) is fixedly connected with a first sealing flange (7), the first sealing flange (7) is fixedly installed with the corresponding mounting flange (4) through bolts, one side of the connecting pipe (6) is fixedly installed with a pressure gauge (8), the other side of the connecting pipe (6) is fixedly installed with an exhaust valve (9), the buffer tank (5) is slidably connected with a piston plate (10) matched therewith, the top surface of the piston plate (10) is fixedly connected with a spring (11), and the middle side wall of the buffer tank (5) is provided with a pressure relief hole (12).

2. An apparatus for pressure testing a subsea pipeline for leaks as claimed in claim 1, characterised in that: The pressurizing mechanism (1) comprises a pressurizing pump (13), and the water inlet end of the pressurizing pump (13) is fixedly connected with a water inlet pipe (14); the water outlet end of the pressurizing pump (13) is fixedly connected with a water outlet pipe (15).

3. An apparatus according to claim 2, wherein: The end of the water outlet pipe (15) is fixedly connected with a second sealing flange (16), the second sealing flange (16) is fixedly installed with the corresponding mounting flange (4) through bolts, and the water outlet pipe (15) is fixedly installed with a stop valve (17).

4. An apparatus for pressure testing a subsea pipeline for leaks as claimed in claim 1, wherein: The upper side of the piston plate (10) is provided with an adjusting plate (18), and the spring (11) is arranged between the adjusting plate (18) and the piston plate (10).

5. An apparatus according to claim 4, wherein: The top of the buffer tank (5) is rotatably connected with a threaded handle (19), the threaded handle (19) is threadedly connected with the adjusting plate (18), the top surface of the adjusting plate (18) is fixedly connected with a guide rod (20) in a symmetrical manner, and the guide rod (20) slidably penetrates the top of the buffer tank (5).

6. An apparatus according to claim 5, wherein: The outer wall of the guide rod (20) is provided with a scale line (21).

Images