A device and method for detecting the tightness of a repair of a short pipe outside the side of a ship

Abstract

The application discloses a device and method for detecting the tightness of a maintenance short pipe outside a ship, and the device and method can effectively solve the problem of high risk coefficient faced by a frogman in underwater maintenance operation outside the ship.

Description

Technical Field

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

[0002] During the design and construction of ships, the outboard stub is a special and crucial section of piping. During normal operation of the ship's equipment, cooling seawater enters the system through a seabed door, passes through the heat exchange equipment, and is discharged from the engine room through the outboard stub, thereby discharging the heat generated by the engine room equipment. As the final section of the seawater cooling system, the outboard stub is directly connected to the hull plating. If leakage or damage occurs during normal navigation, seawater can enter the engine room directly through the outboard stub, creating a risk of accident.

[0003] In the shipping industry, operating ships will regularly go into dry dock for maintenance. For example, when a ship reaches the first five years of operation, it will go into dry dock for major repairs. Generally speaking, the dry dock maintenance cycle is long and the cost is also high.

[0004] However, if the outboard short pipe of an operating ship develops leakage or damage during sea transportation and needs to be repaired, the time between the ship and the overhaul is relatively long. Considering the high cost of dry docking, 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 repair risk factor 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 an outboard short pipe of a ship underway, 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 of a ship underway, comprising the following steps:

[0007] 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;

[0008] 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;

[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 leaking or damaged position marked on the outboard short pipe;

[0011] S4, welding a new flange on the end of the remaining outboard chine pipe by using the fillet welding process, and after the welding, detecting the weld by using the ultrasonic testing method;

[0012] S5, installing the tightness detection device on the new flange of the end of the remaining outboard chine pipe, the tightness detection device comprising a sealing body, a flange sealing plate connected with the sealing body by a connecting rod, and the flange sealing plate being provided with a first pressure gauge and a fresh water connecting pipe joint;

[0013] placing the sealing body into the remaining outboard chine pipe, fixing the flange sealing plate with the new flange, so that a water pressure test sealing cavity is formed among the sealing body, the outboard chine pipe and the flange sealing plate;

[0014] S6, connecting the daily fresh water pipeline near the outboard chine pipe in the engine room with the fresh water connecting pipe joint, filling water into the water pressure test sealing cavity, closing the fresh water connecting pipe joint when the reading of the first pressure gauge on the flange sealing plate reaches a set value, and then timing the water pressure test, if the reading of the first pressure gauge remains unchanged within the set time, the tightness of the fillet weld between the new flange and the remaining outboard chine pipe meets the requirements, the tightness test is passed, and then the outboard valve is fixed with the new flange, and then a finished pipe section is connected between the outboard valve and the outboard main pipe, and the entire pipeline system is connected completely.

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

[0016] Preferably, when the tightness detection device is installed on the replacement pipe section in step S5, first, a rope is connected with the lifting rings on the sealing body, and then the sealing body is placed into the remaining outboard chine pipe from the flange opening of the new flange, so that the sealing body is located on the downstream side of the fillet weld.

[0017] Then, the daily air pipeline near the outboard chine pipe in the engine room is connected with the air connecting pipe joint, and gas is filled into the sealing body to make the sealing body expand to contact the inner wall of the outboard chine pipe, 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 slipping during the expansion process.

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

[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 short pipe of the side discharge occurs, and only one crew member in the engine room is needed to complete the tightness test when the tightness detection device is installed in the repaired outboard short pipe of the side discharge, without the need for auxiliary use of a tugboat, etc., thereby reducing the workload and test cost.

[0030] 2. The tightness detection device of the present application 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 with the flange of the replacement pipe section of the replacement damaged pipe section, and the sealing body and the flange sealing plate are connected through the connecting rod. When water is filled into the water pressure test sealing cavity, the sealing body can be prevented from sliding out of the outboard short pipe of the side discharge under the pressure of water flow.

[0031] 3. The tightness detection 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 short pipe of the side discharge of the ship at sea, and has small test workload and low test cost. 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 below. 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 tightness detection of the repaired outboard short pipe of the side discharge.

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

[0035] Figure 3 is a schematic diagram of the arrangement of the outboard short pipe of the side discharge.

[0036] The meanings of the reference numerals in the drawings are as follows:

[0037] 1 is the outboard short pipe of the side discharge, 2 is the outboard valve of the side discharge, 3 is the new flange, 4 is the sealing body, 41 is the sealing rubber, 42 is the face plate, 43 is the bottom plate, 44 is the circular 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 connection pipe joint, 9 is the lifting ring, 10 is the first pressure gauge, 11 is the fresh water connection pipe joint, 12 is the finished pipe section, 13 is the main pipe of the side discharge, 14 is the ship body outer plate, 15 is the sea water, 16 is the fillet weld, 17 is the main pipe of the side discharge, and 18 is the waterline. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] It should be understood that although the terms first, second, third, etc. may be employed 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 one type of information from another type of information. 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 determination" or "in response to determining".

[0041] 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.

[0042] The present application provides a method for repairing and detecting the tightness of a short pipe outside the hull of a ship, which specifically comprises the following steps:

[0043] S1, during normal navigation of the ship at sea, if the short pipe outside the hull appears to be leaking or damaged, the draft 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 short pipe outside the hull to the water surface.

[0044] 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 navigation state, 20%-40% of the tank capacity of ballast water is directly pumped into the bow ballast tank, and 100% of the tank capacity of ballast water is pumped into the 1# ballast tank in the cargo compartment area, the other ballast tanks in the cargo compartment area and the stern ballast tank are kept empty, so that the short pipe outside the hull is exposed to the water surface by at least 0.55m;

[0045] If the ship is in a cargo carrying state, the amount of ballast water in each ballast tank in the bow ballast tank, the stern ballast tank and the cargo area needs to be adjusted according to the amount of cargo so that the discharge outboard short pipe is exposed to the water surface by at least 0.55m; or the carried cargo is unloaded first, and then the ballast water in each ballast tank is adjusted according to the ballast water adjustment method of the ship in the empty state so that the discharge outboard short pipe is exposed to the water surface by at least 0.55m.

[0046] If the discharge 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 fuel tank in the bow of the ship and / or the appropriate amount of cooling water in the cooling water tank in the stern of the engine room is discharged.

[0047] The discharge outboard short pipe and the engine room of the ship are arranged at the stern of the ship.

[0048] S2, remove the discharge outboard valve 2 and mark the leakage or damage point on the discharge outboard short pipe.

[0049] S3, cut off the leakage pipe section on the discharge outboard short pipe according to the marked leakage or damage position on the discharge outboard short pipe.

[0050] S4, a new flange 3 is welded to the end of the remaining discharge outboard short pipe 1 by using the fillet welding process, and after the welding is completed, the weld is detected by flaw detection.

[0051] S5, install a tightness detection device on the new flange 3 at the end of the remaining discharge outboard short pipe.

[0052] The tightness detection device comprises a sealing body 4 and a flange sealing plate 5 connected to the sealing body 4 through a connecting rod 5.

[0053] The sealing body 4 comprises 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 comprises 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).

[0054] 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.

[0055] Specifically, when the tightness detection device is installed on the new flange 3, first, the rope is connected with the lifting ring 9 on the sealing body 4, and then the sealing body 4 is put into the remaining outboard pipe 1 from the flange opening of the new flange 3, so that the sealing body 4 is located on the downstream side of the fillet weld;

[0056] Then, the daily air pipeline near the outboard pipe in the engine room is connected with the air connection pipe joint 8, the ball valve on the air connection pipe joint 8 is opened, the gas is filled into the sealing body 4 to make the sealing body 4 expand to contact the inner wall of the outboard pipe 1, and the rope is pulled by hand during the process of filling the gas into the sealing body 4 to avoid the position of the sealing body 4 from slipping out of the ship during the expansion process;

[0057] When the reading of the second pressure gauge 7 on the sealing body 4 reaches a set value (for example, 1 MPa), the ball valve on the air connection 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, and then the flange sealing plate 6 is fixed with the new flange 3 by bolts, so that the water pressure test sealing cavity is formed between the sealing body 4, the outboard pipe 1 and the flange sealing plate 6.

[0058] S6, the daily fresh water pipeline near the outboard pipe in the engine room is connected with the fresh water connection pipe joint 11, the ball valve on the fresh water connection pipe joint 11 is opened, water is filled into the water pressure test sealing cavity, when the reading of the first pressure gauge 10 on the flange sealing plate 6 reaches a set value (for example, 0.5 MPa), the ball valve on the fresh water connection pipe joint 11 is closed, the water pressure test is timed, and if the reading of the first pressure gauge remains unchanged within the set time, the tightness of the weld between the new flange 3 and the remaining outboard pipe 1 meets the requirements, and the tightness test is passed.

[0059] After the tightness detection device is removed, the outboard valve 2 is fixed with the new flange 3, and then a finished pipe section 12 is prepared to be connected between the outboard valve 2 and the outboard main pipe 13 (both ends of the finished pipe section have flanges, which are connected with the outboard valve 2 and the outboard main pipe 13 through the flanges), and the entire pipeline system is connected completely.

[0060] The application also provides a tightness detection device for repairing an outboard 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,

[0061] 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).

[0062] 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.

[0063] 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 of a ship underway, 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, weld a new flange to the end of the remaining outboard short pipe using the fillet welding process. After welding, perform a flaw detection on the weld. S5, installing a tightness detection device on the new flange at the end of the remaining outboard short pipe, the tightness detection device comprising 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; The sealing body is placed in the remaining outboard short pipe, and the flange sealing plate is fixed to the new flange, so that a water pressure test sealing chamber is formed between the sealing body, the outboard short pipe, 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, and 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 tightness of the fillet weld between the new flange and the remaining outboard short pipe meets the requirements and the tightness test passes. After removing the tightness detection device, fix the outboard valve to the new flange, and then prepare one end of the finished pipe section and connect it between the outboard valve and the outboard main pipe to complete the connection of the entire piping system.

2. The method for detecting the tightness of the outboard short pipe of a ship underway 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 the outboard short pipe of a ship underway 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 lifting ring on the sealing body, and then place the sealing body through the flange opening of the new flange into the remaining outboard short pipe, so that the sealing body is located on the downstream side of the fillet 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 connecting 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 new flange.

4. The method for detecting the tightness of the outboard short pipe of a ship underway 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 the outboard short pipe of a ship underway 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 the outboard short pipe of a ship underway 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 the outboard short pipe of a ship underway 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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