A device and method for detecting the tightness of a short pipe outside the hull during maintenance at sea

Abstract

The application discloses a kind of seawater maintenance tightness detection device and method of discharge outboard short pipe, when the discharge outboard short pipe appears leakage or damage, the discharge outboard short pipe is exposed to water surface by adjusting ballast water, the damaged pipe section on the discharge outboard short pipe can be cut and replaced in cabin, and the discharge outboard short pipe is repaired, and then the tightness detection device is installed in the repaired discharge outboard short pipe to carry out tightness test.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of shipbuilding technology, in particular to a device and method for detecting the maintenance tightness of a sea water maintenance pipe outside the bilge. BACKGROUND

[0002] In the process of ship design and construction, the pipe outside the bilge is a special and very important pipe. During the normal operation of the ship equipment, the cooling sea water enters the system pipe from the sea inlet, passes through the heat exchange equipment, and then is discharged from the engine room through the pipe outside the bilge, so as to exchange the heat generated during the operation of the engine room equipment. As the last section of the entire sea water cooling system, the pipe outside the bilge is directly connected with the ship plate, and if leakage or damage occurs during the normal navigation of the ship, the sea water will directly enter the engine room from the pipe outside the bilge, causing the risk of accidents.

[0003] In the shipping industry, the operating ship will be regularly docked for maintenance, for example, the ship will be docked for overhaul after 5 years of operation. Generally speaking, the period of maintenance in the dock is relatively long, and the cost is also very high.

[0004] However, if the pipe outside the bilge of the operating ship needs to be repaired due to leakage or damage during sea transportation, the time to the next docking for overhaul is relatively long. Considering the high cost of docking for overhaul, the repair of the pipe outside the bilge is usually carried out at sea. However, the repair needs to be carried out by a diver under water from the outer wall of the side plate, which has a large risk coefficient, a large workload, and cannot guarantee the repair quality. SUMMARY

[0005] Therefore, the present application provides a device and method for detecting the maintenance tightness of a sea water maintenance pipe outside the bilge to solve the problems in the background.

[0006] A method for detecting the maintenance tightness of a sea water maintenance pipe outside the bilge, specifically comprising the following steps:

[0007] S1, during the normal navigation of the ship at sea, if the pipe outside the bilge has a leakage or damage point, the amount of ballast water in each ballast tank is adjusted to adjust the draft of the ship to expose the pipe outside the bilge to the water surface according to the ballast water allocation chart of the ship;

[0008] If the pipe outside the bilge cannot be exposed to the water surface by adjusting the ballast water, the fuel in the engine room is transferred to the fuel tank at the bow of the ship and / or the appropriate amount of cooling water in the cooling water tank at the stern of the engine room is discharged;

[0009] S2, remove the valve outside the bilge, and mark the leakage or damage point on the pipe outside the bilge;

[0010] S3, according to the marked leakage or damage position on the pipe outside the bilge, cut off the leakage pipe section on the pipe outside the bilge;

[0011] S4, the length, size and cutting off the same size of the replacement pipe segment and the remaining pipe segment are welded by butt welding process, and the welding is fixed as a whole after the welding, and the weld is detected by flaw detection;

[0012] S5, the sealing detection device is installed on the replacement pipe segment, the sealing detection device includes a sealing body, a flange sealing plate connected with the sealing body through a connecting rod, and the flange sealing plate is provided with a first pressure gauge and a fresh water connecting pipe joint;

[0013] The sealing body is placed in the remaining pipe segment, the flange sealing plate is fixed with the flange of the replacement pipe segment, so that the sealing body, the pipe segment, the replacement pipe segment and the flange sealing plate form a water pressure test sealing cavity;

[0014] S6, the daily fresh water pipeline near the pipe segment in the cabin is connected with the fresh water connecting pipe joint, water is filled into the water pressure test sealing cavity, when the reading of the first pressure gauge on the flange sealing plate reaches the set value, the fresh water connecting pipe joint is closed, the water pressure test is timed, if the reading of the first pressure gauge remains unchanged within the set time, the weld tightness between the replacement pipe segment and the remaining pipe segment meets the requirements, the tightness test is passed, after the tightness detection device is removed, the pipe segment and the replacement pipe segment are connected with the pipe, and the whole pipeline system is connected completely.

[0015] Preferably, the sealing body includes a sealing frame, sealing rubber is arranged at both ends of the sealing frame to form a sealing cavity structure, a second pressure gauge, an air connecting pipe joint and a plurality of symmetrical lifting rings are fixed on the sealing frame, and the sealing frame is welded with the connecting rod.

[0016] Preferably, when the sealing detection device is installed on the replacement pipe segment in step S5, first, the rope is connected with the lifting ring on the sealing body, then the sealing body is put into the remaining pipe segment from the flange opening of the replacement pipe segment, and the sealing body is located on the downstream side of the weld;

[0017] Then, the daily air pipeline near the pipe segment in the cabin is connected with the air connecting pipe joint, gas is filled into the sealing body to make the sealing body expand to contact with the inner wall of the pipe segment, and the rope is pulled by hand during the process of filling gas into the sealing body to avoid the position of the sealing body from slipping during the expansion process;

[0018] When the reading of the second pressure gauge on the sealing body reaches the set value, the air connecting pipe joint is closed, the rope on the lifting ring is released, then the flange sealing plate is fixed with the sealing body through the connecting rod, and the flange sealing plate is fixed with the flange of the replacement pipe segment.

[0019] Preferably, the sealing frame comprises a plurality of parallelly arranged panels and bottom plates, and a plurality of round pipes connected between the panels and the bottom plates, and the sealing rubber is adhered between the panels and the bottom plates by cold vulcanization adhesive.

[0020] Preferably, in the step S1, when the draft state of the ship is adjusted by adjusting the amount of ballast water in each ballast tank, the at least one outboard pipe is exposed to the water surface by at least 0.55 m.

[0021] Preferably, in the step S1, when the draft state of the ship is adjusted by adjusting the amount of ballast water in each ballast tank, if the ship is in the empty sailing state, 20%-40% of the ballast water in the bow ballast tank is directly injected, 100% of the ballast water in the 1# ballast tank in the cargo area is injected, the other ballast tanks in the cargo area and the stern ballast tank are kept empty, and the at least one outboard pipe is exposed to the water surface by at least 0.55 m.

[0022] If the ship is in the loaded sailing state, the amount of ballast water in the bow ballast tank, the stern ballast tank and each ballast tank in the cargo area is adjusted according to the amount of cargo, so that the at least one outboard pipe is exposed to the water surface by at least 0.55 m; or after the cargo is unloaded, the amount of ballast water is adjusted according to the ballast water adjustment method in the empty sailing state of the ship to make the at least one outboard pipe exposed to the water surface by at least 0.55 m.

[0023] Preferably, the at least one outboard pipe and the ship engine room are arranged at the stern of the ship.

[0024] A device for detecting the sealing performance of an outboard pipe during maintenance at sea, comprising a sealing body, a flange sealing plate connected to the sealing body through a connecting rod,

[0025] The sealing body comprises a sealing frame, the two ends of the sealing frame are provided with sealing rubber to form a sealing cavity structure, the sealing frame is fixed with a second pressure gauge, an air connection pipe joint and a plurality of symmetrically arranged lifting rings, and the sealing frame is welded and fixed with the connecting rod.

[0026] The flange sealing plate is provided with a first pressure gauge and a fresh water connection pipe joint.

[0027] Preferably, the sealing frame comprises a plurality of parallelly arranged panels and bottom plates, and a plurality of round pipes connected between the panels and the bottom plates, and the sealing rubber is adhered between the panels and the bottom plates by cold vulcanization adhesive.

[0028] The beneficial effects of the present application are:

[0029] 1. The present application can effectively solve the problem of high risk coefficient faced by frogmen in underwater ship maintenance operation when the leakage or damage of the outboard pipe appears, and the damaged pipe section can be cut and replaced in the engine room, and the tightness test device can be installed in the repaired outboard pipe to test the tightness, and only one crew member is needed in the engine room to complete the test without the need of auxiliary tugboat, and the workload is small and the test cost is low.

[0030] 2. The tightness test device of the present application is composed of a sealing body, a connecting rod and a flange sealing plate, and when the tightness test is performed, the sealing body is placed on the downstream side of the weld, the flange sealing plate is fixed with the flange of the replacement pipe section of the replaced damaged pipe section, and the sealing body and the flange sealing plate are connected through the connecting rod, so that the sealing body can be prevented from sliding out of the outboard pipe under the pressure of water flow when water is filled into the water pressure test sealing cavity.

[0031] 3. The tightness test device of the present application has simple structure and is convenient to use, and can effectively complete the tightness test required after the maintenance of the outboard pipe of the ship at sea, and the test workload is small and the test cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0033] Figure 1 is a schematic diagram of the tightness test of the repaired outboard pipe.

[0034] Figure 2 is a schematic diagram of the repaired outboard pipe.

[0035] Figure 3 is Figure 2 is an enlarged view of part A in

[0036] Figure 4 is a schematic diagram of the arrangement of the outboard pipe.

[0037] The meanings of the reference numerals in the drawings are as follows:

[0038] 1 is a discharge pipe, 2 is a discharge valve, 3 is a replacement pipe section, 4 is a sealing body, 41 is a sealing rubber, 42 is a face plate, 43 is a bottom plate, 44 is a round pipe, 45 is an external threaded pipe base, 5 is a connecting rod, 6 is a flange sealing plate, 7 is a second pressure gauge, 8 is an air connection pipe joint, 9 is a lifting ring, 10 is a first pressure gauge, 11 is a fresh water connection pipe joint, 12 is a flange of the replacement pipe section, 13 is a discharge main pipe, 14 is a ship outer plate, 15 is sea water, 16 is a welding seam, 17 is a discharge main pipe, and 18 is a waterline. DETAILED DESCRIPTION

[0039] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be described below in detail through specific embodiments shown in the drawings. However, it should be understood that the description is only exemplary and is not intended to limit the scope of the present application. In addition, in the following description, the description of the known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0040] The terms used in the present disclosure are merely for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The singular forms "a", "said" and "the" used in the present disclosure and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein means and includes any or all possible combinations of one or more associated listed items.

[0041] It should be understood that although the terms first, second, third, etc. can be used in the present disclosure to describe various information, these information should not be limited to these terms and should not be understood as indicating or implying relative importance. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as "when" or "upon" or "in response to determining".

[0042] In order to better understand the technical solutions of the present application, the present application will be described in detail below in combination with the drawings.

[0043] The present application provides a method for detecting the sealing performance of a discharge pipe during offshore maintenance, which specifically comprises the following steps:

[0044] S1, during normal navigation of a ship, if the discharge pipe appears to be leaking or damaged, the waterline state of the ship is adjusted by adjusting the amount of ballast water in each ballast tank according to the ballast water allocation diagram of the ship to expose the discharge pipe above water.

[0045] Specifically, when adjusting the draft state of the ship by adjusting the amount of ballast water in each ballast tank, if the ship is in an empty sailing state, 20%-40% of the tank capacity of ballast water is directly pumped into the bow ballast tank, 100% of the tank capacity of ballast water is pumped into the 1# ballast tank in the cargo hold area, the other ballast tanks in the cargo hold area and the stern ballast tank are kept empty, and the outboard short pipe is exposed to the water surface by at least 0.55m.

[0046] If the ship is in a cargo sailing state, the amount of ballast water in the bow ballast tank, the stern ballast tank and each ballast tank in the cargo hold area needs to be adjusted according to the amount of cargo to make the outboard short pipe exposed to the water surface by at least 0.55m; or the carried cargo is unloaded first, and then the amount of ballast water in each ballast tank is adjusted according to the ballast water adjustment method of the ship in an empty sailing state to make the outboard short pipe exposed to the water surface by at least 0.55m.

[0047] If the outboard short pipe cannot be exposed to the water surface by adjusting the ballast water alone, the fuel in the engine room is transferred to the bow fuel tank and / or an appropriate amount of cooling water is discharged from the stern cooling water tank in the engine room.

[0048] The outboard short pipe and the ship engine room are arranged at the stern of the ship.

[0049] S2, remove the outboard valve 2 and mark the leakage or damage point on the outboard short pipe.

[0050] S3, cut off the leakage pipe section on the outboard short pipe according to the marked leakage or damage position.

[0051] S4, use butt welding process to weld and fix the replacement pipe section 3 with the same length and size as the cut-off leakage pipe section to the remaining outboard short pipe 1, and after welding, detect the weld joint.

[0052] S5, install a tightness detection device on the replacement pipe section.

[0053] The tightness detection device includes a sealing body 4 and a flange sealing plate 5 connected to the sealing body 4 through a connecting rod 5.

[0054] The sealing body 4 includes a sealing frame, sealing rubbers 41 are arranged at both ends of the sealing frame to form a sealing cavity structure, a second pressure gauge 7, an air connection pipe joint 8 and a plurality of symmetrically arranged lifting rings 9 are fixed on the sealing frame, and a ball valve is arranged on the air connection pipe joint 8. In the embodiment, the sealing frame includes a panel 42 and a bottom plate 43 arranged in parallel, a plurality of round pipes 44 connected between the panel 42 and the bottom plate 43, and the sealing rubbers 41 are adhered between the panel 42 and the bottom plate 43 by cold vulcanization adhesive. The panel 42 can be welded and fixed with the connecting rod 5, or can be threadedly connected with the connecting rod 5 through an external thread pipe seat 45 (the external thread pipe seat 45 is welded and fixed on the panel 42).

[0055] The flange sealing plate 6 is provided with a first pressure gauge 10 and a fresh water connecting pipe joint 11, the fresh water connecting pipe joint 11 is provided with a ball valve, a through hole is formed in the center of the flange sealing plate 6, the connecting rod 5 passes through the through hole and is locked and fixed with the flange sealing plate 6 through a flat washer, a rubber washer and a wing nut, so that the through hole is sealed.

[0056] Specifically, when the sealing detection device is installed on the replacement pipe section 3, first, the rope is connected with the lifting ring 9 on the sealing body 4, then the sealing body 4 is put into the remaining outboard short pipe 1 from the flange opening of the replacement pipe section flange 12, so that the sealing body 4 is located on the downstream side of the welding seam;

[0057] Then, the daily air pipe near the outboard short pipe in the engine room is connected with the air connecting pipe joint 8, the ball valve on the air connecting pipe joint 8 is opened, the sealing body 4 is filled with gas to make the sealing body 4 expand to contact with the inner wall of the outboard short pipe 1, and the rope is pulled by hand during the process of filling the sealing body 4 with gas to avoid the position of the sealing body 4 from slipping out of the pipe opening of the outboard short pipe 1 to the outside of the ship;

[0058] When the reading of the second pressure gauge 7 on the sealing body 4 reaches a set value (for example, 1MPa), the ball valve on the air connecting pipe joint 8 is closed, the rope on the lifting ring 9 is released, then the connecting rod 5 and the flange sealing plate 6 are fixed with the sealing body 4, then the flange sealing plate 6 is fixed with the flange 12 of the replacement pipe section by bolts, so that the sealing cavity for water pressure test is formed between the sealing body 4, the outboard short pipe 1, the replacement pipe section 3 and the flange sealing plate 6.

[0059] S6, the daily fresh water pipe near the outboard short pipe in the engine room is connected with the fresh water connecting pipe joint 11, the ball valve on the fresh water connecting pipe joint 11 is opened, water is filled into the sealing cavity for water pressure test, when the reading of the first pressure gauge 10 on the flange sealing plate 6 reaches a set value (for example, 0.5MPa), the ball valve on the fresh water connecting pipe joint 11 is closed, the water pressure test is timed, if the reading of the first pressure gauge remains unchanged within the set time, the welding seam between the replacement pipe section 3 and the remaining outboard short pipe 1 meets the requirements, and the sealing test is passed.

[0060] After the sealing detection device is removed, the outboard valve 2 can be installed between the replacement pipe section 3 and the outboard main pipe 13, and the entire pipe system is connected completely.

[0061] The application also provides a sealing detection device for repairing an outboard short pipe at sea, which comprises a sealing body 4, a flange sealing plate 6 connected with the sealing body 4 through a connecting rod 5,

[0062] The sealing body 4 comprises a sealing frame, both ends of the sealing frame are provided with sealing rubbers 41 to form a sealing cavity structure, a second pressure gauge 7, an air connection pipe joint 8 and a plurality of symmetrically arranged lifting rings 9 are fixed on the sealing frame, and a ball valve is arranged on the air connection pipe joint 8. In the embodiment, the sealing frame comprises parallel arranged face plates 42 and bottom plates 43, a plurality of round pipes 44 are connected between the face plates 42 and the bottom plates 43, and the sealing rubbers 41 are adhered between the face plates 42 and the bottom plates 43 by cold vulcanization adhesive. The face plates 42 can be welded and fixed with the connecting rod 5, or can be threadedly connected with the connecting rod 5 through an outer thread pipe base 45 (the outer thread pipe base 45 is welded and fixed on the face plate 42).

[0063] The flange sealing plate 6 is provided with a first pressure gauge 10 and a fresh water connection pipe joint 11, a ball valve is arranged on the fresh water connection pipe joint 11, a through hole is formed in the center of the flange sealing plate 6, the connecting rod 5 passes through the through hole and is locked and fixed with the flange sealing plate 6 through a flat washer, a rubber washer and a wing nut to seal the through hole.

[0064] It should be clear that the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

Claims

1. A method for detecting the tightness of an outboard short pipe during offshore maintenance, characterized in that: The specific steps include: S1. During normal navigation at sea, if the outboard short pipe has leakage or damage, the ballast water volume in each ballast tank shall be adjusted according to the ballast water loading diagram of the ship to adjust the draft of the ship so that the outboard short pipe is exposed above the water surface; If the ballast water cannot be adjusted to allow the outboard discharge nozzle to emerge from the water, transfer the fuel oil in the engine room to the bow fuel oil tank and / or discharge an appropriate amount of cooling water from the cooling water tank at the stern of the engine room; S2, remove the overboard valve and mark the leakage or damage point on the overboard short pipe; S3, cutting off the leaking pipe section on the outboard short pipe according to the leaking or damaged position marked on the outboard short pipe; S4, using the butt welding process to weld a replacement pipe section with the same length and size as the cut-off leaking pipe section to the remaining outboard short pipe to form a whole. After welding is completed, the weld is inspected for flaws; S5, installing a tightness detection device on the replacement pipe section, the tightness detection device including a sealing body and a flange sealing plate connected to the sealing body via a connecting rod, the flange sealing plate being provided with a first pressure gauge and a fresh water connecting pipe joint; Place the sealing body in the remaining outboard short pipe, and secure the flange sealing plate to the flange of the replacement pipe section, thereby forming a water pressure test sealing chamber between the sealing body, the outboard short pipe, the replacement pipe section, and the flange sealing plate; S6. Connect the daily fresh water pipeline near the outboard short pipe in the engine room to the fresh water connecting pipe joint, fill water into the hydrostatic test sealing chamber, and when the reading of the first pressure gauge on the flange seal plate reaches the set value, close the fresh water connecting pipe joint and perform the hydrostatic test timing. If the reading of the first pressure gauge remains unchanged within the set time, the weld tightness between the replacement pipe section and the remaining outboard short pipe meets the requirements and the tightness test passes. After removing the tightness detection device, you can connect the outboard valve to the replacement pipe section and the outboard main pipe to complete the connection of the entire piping system.

2. The method for detecting the tightness of an outboard short pipe for offshore maintenance according to claim 1, characterized in that: The sealing body includes a sealing frame, and sealing rubber is provided at both ends of the sealing frame to form a sealed cavity structure. A second pressure gauge, an air connecting pipe joint and a plurality of symmetrically arranged lifting rings are fixed on the sealing frame, and the sealing frame is welded and fixed to the connecting rod.

3. The method for detecting the tightness of an outboard short pipe during offshore maintenance according to claim 2, characterized in that: When installing the tightness detection device on the replacement pipe section in step S5, first, connect the rope to the eye on the sealing body, then place the sealing body through the flange opening of the replacement pipe section into the remaining outboard short pipe, so that the sealing body is located on the downstream side of the weld; Then, the daily air pipeline near the outboard short pipe in the engine room is connected to the air connection pipe joint, and gas is injected into the sealing body to expand the sealing body so that the sealing body contacts the inner wall of the outboard short pipe. During the process of injecting gas into the sealing body, the rope is tightened by hand to prevent the position of the sealing body from slipping during the expansion process. When the reading of the second pressure gauge on the sealing body reaches the set value, close the air connection pipe joint, release the rope on the lifting ring, and then fix the flange sealing plate to the sealing body through the connecting rod, and then fix the flange sealing plate to the flange of the replacement pipe section.

4. The method for detecting the tightness of an outboard short pipe for offshore maintenance according to claim 2, characterized in that: The sealing frame comprises a panel and a bottom plate arranged in parallel, and a plurality of round tubes connected between the panel and the bottom plate. The sealing rubber is bonded between the panel and the bottom plate by cold vulcanized adhesive.

5. The method for detecting the tightness of an outboard short pipe for offshore maintenance according to claim 1, characterized in that: When adjusting the draft of the ship by adjusting the amount of ballast water in each ballast tank in step S1, the outboard short pipe should be exposed to at least 0.55m above the water surface.

6. The method for detecting the tightness of an outboard short pipe during offshore maintenance according to claim 1 or 5, characterized in that: When adjusting the ballast water volume in each ballast tank to adjust the draft of the ship in step S1, if the ship is in an unladen navigation state, 20%-40% of the ballast water capacity is directly pumped into the bow ballast tank, and 100% of the ballast water capacity is pumped into the No. 1 ballast tank in the cargo area, while keeping the other ballast tanks in the cargo area and the aft ballast tank unladen, so that the outboard short pipe is at least 0.55m above the water surface; If the ship is in a loaded voyage, the ballast water volume in the bow ballast tank, stern ballast tank and each ballast tank in the cargo hold area needs to be adjusted according to the cargo volume so that the outboard short pipe is at least 0.55m above the water surface; or after unloading the cargo, the ballast water is adjusted according to the ballast water adjustment method for the hold in an empty voyage so that the outboard short pipe is at least 0.55m above the water surface.

7. The method for detecting the tightness of an outboard short pipe during offshore maintenance according to claim 1, characterized in that: The outboard short pipe and the ship engine room are both arranged at the stern of the ship.

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