Device and method for detecting marine maintenance tightness of exhaust outboard short pipe

Abstract

The invention discloses a seawater maintenance tightness detection device and method for an outboard discharge short pipe, and the device enables the outboard discharge short pipe to be exposed out of the water surface in a manner of adjusting ballast water when the outboard discharge short pipe leaks or is damaged, and can cut, replace and maintain the damaged pipe section on the outboard discharge short pipe in a cabin. And then the tightness detection device is installed in the maintained outboard short pipe to carry out tightness test on the outboard short pipe.

Description

Technical Field

[0001] The invention relates to the technical field of shipbuilding, and in particular to a device and method for detecting the tightness of seawater maintenance of an outboard short pipe. Background Art

[0002] During the design and construction of ships, the outboard short pipe is a special and very important pipeline. During the normal operation of ship equipment, cooling seawater enters the system pipeline through the seabed door, passes through the heat exchange equipment, and then is discharged from the engine room through the outboard short pipe, thereby exchanging the heat generated during the operation of the engine room equipment. As the last section of the entire seawater cooling system, the outboard short pipe is directly connected to the hull outer plate. If leakage or damage occurs during the normal navigation of the ship, seawater will directly enter the engine room from the outboard short pipe, causing accident risks.

[0003] In the shipping industry, operating ships will be regularly dry-docked for maintenance. For example, when a ship reaches five years of operation for the first time, it will be docked for an overhaul. Generally speaking, the maintenance cycle in the dry dock is long and the cost is also high.

[0004] However, if the outboard short pipe of an operating ship has leakage points or damage during sea transportation and needs to be repaired, the time from docking for overhaul is relatively long. Considering the high cost of docking for repair, the outboard short pipe is usually repaired at sea. However, during the repair, frogmen are required to repair the outboard short pipe underwater from the outer wall of the side outer plate. The risk factor of the repair is high, the workload is large, and the quality of the repair cannot be guaranteed. Summary of the invention

[0005] In view of this, the present invention provides a device and method for detecting the tightness of a short outboard pipe for seawater maintenance, so as to solve the problems existing in the above-mentioned background technology.

[0006] A method for detecting the tightness of an outboard short pipe during offshore maintenance, specifically comprising the following steps:

[0007] S1. During the normal navigation of the ship at sea, if the outboard short pipe has leakage or damage, the draft of the ship shall be adjusted by adjusting the ballast water volume in each ballast tank according to the ballast water loading diagram of the ship so that the outboard short pipe is exposed above the water surface;

[0008] If the ballast water cannot be adjusted to make the outboard short pipe emerge from the water surface, the fuel oil in the engine room shall be transferred to the bow fuel oil tank and / or an appropriate amount of cooling water in the cooling water tank at the stern of the engine room shall be discharged;

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

[0010] S3, cutting off the leaking pipe section on the outboard short pipe according to the leakage or damage position marked on the outboard short pipe;

[0011] S4, using a butt welding process to weld a replacement pipe section with the same length and size as the cut leaking pipe section to the remaining outboard short pipe, and after welding, perform a flaw detection on the weld;

[0012] S5, installing a tightness detection device on the replacement pipe section, the tightness detection device comprising a sealing body and a flange sealing plate connected to the sealing body through a connecting rod, wherein 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 outboard short pipe, and the flange sealing plate is fixed to the flange of the replacement pipe section, so that a water pressure test sealing chamber is formed between the sealing body, the outboard short pipe, the replacement pipe section, and the flange sealing plate;

[0014] 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 water pressure test sealing chamber, when the reading of the first pressure gauge on the flange sealing plate reaches the set value, close the fresh water connecting pipe joint, and perform the water pressure 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, the outboard valve can be connected to the replacement pipe section and the outboard main pipe to complete the connection of the entire pipeline system.

[0015] Preferably, 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.

[0016] Preferably, when installing the tightness detection device on the replacement pipe section in step S5, first, a rope is connected to the lifting ring on the sealing body, and then the sealing body is placed from 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;

[0017] 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 filled into the sealing body to expand the sealing body so as to contact the inner wall of the outboard short pipe. During the process of filling the 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;

[0018] 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.

[0019] Preferably, 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, and the sealing rubber is bonded between the panel and the bottom plate by cold vulcanized adhesive.

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

[0021] Preferably, when the draft of the ship is adjusted by adjusting the amount of ballast water in each ballast tank in step S1, if the ship is in an unloaded sailing 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 hold area, and other ballast tanks and the stern ballast tank in the cargo hold area are kept unloaded, so that the outboard short pipe is at least 0.55m above the water surface;

[0022] If the ship is in a cargo-carrying state, 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 short outboard pipe is at least 0.55m above the water surface; or after the cargo is unloaded, the ballast water is adjusted according to the ballast water adjustment method for the hold in an unloaded state, so that the short outboard pipe is at least 0.55m above the water surface.

[0023] Preferably, the outboard short pipe and the ship engine room are both arranged at the stern.

[0024] A device for detecting the tightness of an outboard short pipe for offshore maintenance, 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, and sealing rubber is arranged at both ends of the sealing frame to form a sealing cavity structure, a second pressure gauge, an air connection pipe joint and a plurality of symmetrically arranged lifting rings are fixed on the sealing frame, and the sealing frame is fixed to the connecting rod by welding;

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

[0027] Preferably, 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, and the sealing rubber is bonded between the panel and the bottom plate by cold vulcanized adhesive.

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

[0029] 1. When the outboard short pipe leaks or is damaged, the present invention can make the outboard short pipe exposed to the water surface by adjusting the ballast water, and the damaged pipe section on the outboard short pipe can be cut and replaced in the engine room to repair it, and then the tightness detection device is installed in the repaired outboard short pipe to perform a tightness test on it, which effectively solves the problem of high risk factor faced by frogmen in underwater outboard maintenance operations, and the tightness test can be completed by only one crew member in the engine room, without the need for auxiliary tugboats, etc., with small workload and low test cost.

[0030] 2. The tightness detection device of the present invention is composed of a sealing body, a connecting rod and a flange sealing plate. During the tightness test, the sealing body is placed on the downstream side of the weld, the flange sealing plate is fixed to the flange of the replacement pipe section that replaces the damaged pipe section, and the sealing body and the flange sealing plate are connected by a connecting rod. When water is filled into the water pressure test sealing chamber, the sealing body can be prevented from sliding out of the outboard short pipe under the water flow pressure.

[0031] 3. The tightness detection device of the present invention has a simple structure and is easy to use. It can effectively complete the tightness test required for the ship's outboard short pipe after maintenance at sea, and the test workload is small and the test cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 This is a schematic diagram of tightness testing of the outboard short pipe after repair.

[0034] Figure 2 This is a schematic diagram of the outboard short pipe after repair.

[0035] Figure 3 yes Figure 2 Enlarged view of part A.

[0036] Figure 4 It is a schematic diagram of the arrangement of the outboard short pipes.

[0037] The meanings of the numbers in the figure are:

[0038] 1 is the short outboard discharge pipe, 2 is the outboard discharge valve, 3 is the replacement pipe section, 4 is the sealing body, 41 is the sealing rubber, 42 is the panel, 43 is the bottom plate, 44 is the round pipe, 45 is the external threaded pipe seat, 5 is the connecting rod, 6 is the flange sealing plate, 7 is the second pressure gauge, 8 is the air connecting pipe joint, 9 is the lifting ring, 10 is the first pressure gauge, 11 is the fresh water connecting pipe joint, 12 is the flange of the replacement pipe section, 13 is the outboard discharge main pipe, 14 is the hull outer plate, 15 is seawater, 16 is the weld, 17 is the outboard discharge main pipe, and 18 is the waterline. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0040] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to 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. may be used in the present disclosure to describe various information, such 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 the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0042] In order to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings.

[0043] The present invention provides a method for detecting the tightness of an outboard short pipe during offshore maintenance, which specifically comprises the following steps:

[0044] S1. During the normal navigation of the ship at sea, if the outboard short pipe has leakage or damage, the draft of the ship shall be adjusted by adjusting the ballast water volume in each ballast tank according to the ballast water loading diagram of the ship so that the outboard short pipe is exposed above the water surface.

[0045] Specifically, when adjusting the draft of the ship by adjusting the amount of ballast water in each ballast tank, if the ship is in an unloaded sailing 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 hold area, and other ballast tanks in the cargo hold area and the stern ballast tank are kept unloaded, so that the outboard short pipe is at least 0.55m above the water surface;

[0046] If the ship is in a cargo-carrying state, 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 short outboard pipe is at least 0.55m above the water surface; or the cargo should be unloaded first, and then the ballast water in each ballast tank should be adjusted according to the ballast water adjustment method for the ship in an unloaded state, so that the short outboard pipe is at least 0.55m above the water surface.

[0047] If the ballast water cannot be adjusted to allow the outboard discharge short pipe to emerge from the water surface, the fuel in the engine room shall be transferred to the bow fuel tank and / or an appropriate amount of cooling water in the cooling water tank at the stern of the engine room shall be discharged.

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

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

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

[0051] S4, using a butt welding process to weld a replacement pipe section 3 having the same length and size as the cut leaking pipe section to the remaining outboard short pipe 1 as a whole, and after welding, perform a flaw detection on the weld.

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

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

[0054] The sealing body 4 includes a sealing frame, and sealing rubbers 41 are arranged at both ends of the sealing frame to form a sealed 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 this embodiment, the sealing frame includes a panel 42 and a bottom plate 43 arranged in parallel, and a plurality of round tubes 44 connected between the panel 42 and the bottom plate 43. The sealing rubber 41 is bonded between the panel 42 and the bottom plate 43 by cold vulcanized adhesive. The panel 42 can be welded and fixed to the connecting rod 5, or can be threadedly connected to the connecting rod 5 through an external threaded pipe seat 45 (the external threaded pipe seat 45 is welded and fixed to 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, on which a ball valve is installed. A through hole is opened in the center of the flange sealing plate 6, through which the connecting rod 5 passes and is locked and fixed to the flange sealing plate 6 by a flat washer, a rubber washer and a butterfly nut, thereby sealing the through hole.

[0056] Specifically, when installing the tightness detection device on the replacement pipe section 3, first, connect the rope to the lifting ring 9 on the sealing body 4, and then put the sealing body 4 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 weld;

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

[0058] When the reading of the second pressure gauge 7 on the sealing body 4 reaches the set value (for example, 1 MPa), close the ball valve on the air connecting pipe joint 8, release the rope on the lifting ring 9, and then fix the connecting rod 5 and the flange sealing plate 6 to the sealing body 4, and then use bolts to fix the flange sealing plate 6 to the flange 12 of the replacement pipe section, so that a water pressure test sealing chamber 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, connect the daily fresh water pipeline near the outboard short pipe in the engine room to the fresh water connecting pipe joint 11, open the ball valve on the fresh water connecting pipe joint 11, fill water into the water pressure test sealing chamber, when the reading of the first pressure gauge 10 on the flange sealing plate 6 reaches the set value (for example, 0.5MPa), close the ball valve on the fresh water connecting pipe joint 11, and start the water pressure test timing. If the reading of the first pressure gauge remains unchanged within the set time, the weld tightness between the replacement pipe section 3 and the remaining outboard short pipe 1 meets the requirements, and the tightness test passes.

[0060] After the tightness detection device is removed, the outboard valve 2 can be installed between the replacement pipe section 3 and the outboard main pipe 13 to complete the connection of the entire pipeline system.

[0061] The present invention also provides a device for detecting the tightness of an outboard short pipe for offshore maintenance, comprising a sealing body 4, a flange sealing plate 6 connected to the sealing body 4 via a connecting rod 5,

[0062] The sealing body 4 includes a sealing frame, and sealing rubbers 41 are arranged at both ends of the sealing frame to form a sealed 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 this embodiment, the sealing frame includes a panel 42 and a bottom plate 43 arranged in parallel, and a plurality of round tubes 44 connected between the panel 42 and the bottom plate 43. The sealing rubber 41 is bonded between the panel 42 and the bottom plate 43 by cold vulcanized adhesive. The panel 42 can be welded and fixed to the connecting rod 5, or can be threadedly connected to the connecting rod 5 through an external threaded pipe seat 45 (the external threaded pipe seat 45 is welded and fixed to the panel 42).

[0063] The flange sealing plate 6 is provided with a first pressure gauge 10 and a fresh water connecting pipe joint 11, on which a ball valve is installed. A through hole is opened in the center of the flange sealing plate 6, through which the connecting rod 5 passes and is locked and fixed to the flange sealing plate 6 by a flat washer, a rubber washer and a butterfly nut, thereby sealing the through hole.

[0064] It should be clear that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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 the normal navigation of the ship at sea, if the outboard short pipe has leakage or damage, the draft of the ship shall be adjusted by adjusting the ballast water volume in each ballast tank according to the ballast water loading diagram of the ship so that the outboard short pipe is exposed above the water surface; If the ballast water cannot be adjusted to make the outboard short pipe emerge from the water surface, the fuel oil in the engine room shall be transferred to the bow fuel oil tank and / or an appropriate amount of cooling water in the cooling water tank at the stern of the engine room shall be discharged; 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 leakage or damage position marked on the outboard short pipe; S4, using a butt welding process to weld a replacement pipe section with the same length and size as the cut leaking pipe section to the remaining outboard short pipe, and after welding, perform a flaw detection on the weld; S5, installing a tightness detection device on the replacement pipe section, the tightness detection device comprising a sealing body and a flange sealing plate connected to the sealing body through a connecting rod, wherein the flange sealing plate is provided with a first pressure gauge and a fresh water connecting pipe joint; The sealing body is placed in the remaining outboard short pipe, and the flange sealing plate is fixed to the flange of the replacement pipe section, so that a water pressure test sealing chamber is formed 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 water pressure test sealing chamber, when the reading of the first pressure gauge on the flange sealing plate reaches the set value, close the fresh water connecting pipe joint, and perform the water pressure 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, the outboard valve can be connected to the replacement pipe section and the outboard main pipe to complete the connection of the entire pipeline 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 comprises a sealing frame, and sealing rubbers are 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 symmetrically arranged lifting rings are fixed on the sealing frame, and the sealing frame is fixed to the connecting rod by welding.

3. The method for detecting the tightness of an outboard short pipe for offshore maintenance according to claim 2, characterized in that: When installing the tightness detection device on the replacement pipe section in step S5, first, a rope is connected to the lifting ring on the sealing body, and then the sealing body is placed from 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 filled into the sealing body to expand the sealing body so as to contact the inner wall of the outboard short pipe. During the process of filling the 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 face plate and a bottom plate arranged in parallel, and a plurality of round tubes connected between the face plate and the bottom plate. The sealing rubber is bonded between the face plate 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 the draft of the ship is adjusted by adjusting the amount of ballast water in each ballast tank in step S1, the outboard short pipe should be exposed above the water surface by at least 0.55m.

6. The method for detecting the tightness of an outboard short pipe for offshore maintenance according to claim 1 or 5, characterized in that: When the draft of the ship is adjusted by adjusting the amount of ballast water in each ballast tank in step S1, if the ship is in an unloaded sailing 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 hold area, and other ballast tanks in the cargo hold area and the stern ballast tank are kept unloaded, so that the outboard short pipe is at least 0.55m above the water surface; If the ship is in a cargo-carrying state, 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 short outboard pipe is at least 0.55m above the water surface; or after the cargo is unloaded, the ballast water is adjusted according to the ballast water adjustment method for the hold in an unloaded state, so that the short outboard pipe is at least 0.55m above the water surface.

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

8. A device for detecting the tightness of an outboard short pipe for offshore maintenance, characterized in that: It includes a sealing body and a flange sealing plate connected to the sealing body through a connecting rod. The sealing body comprises a sealing frame, and sealing rubber is arranged at both ends of the sealing frame to form a sealing cavity structure, a second pressure gauge, an air connection pipe joint and a plurality of symmetrically arranged lifting rings are fixed on the sealing frame, and the sealing frame is fixed to the connecting rod by welding; The flange sealing plate is provided with a first pressure gauge and a fresh water connecting pipe joint.

9. The offshore maintenance tightness detection device for outboard short pipes according to claim 8, characterized in that: The sealing frame comprises a face plate and a bottom plate arranged in parallel, and a plurality of round tubes connected between the face plate and the bottom plate. The sealing rubber is bonded between the face plate and the bottom plate by cold vulcanized adhesive.

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