A method for testing the strength of cargo oil tankers of product oil tankers

Abstract

A method for strength testing of cargo oil tankers in product oil tankers is disclosed. The product oil tanker is a single-tank, single-pump type, equipped with a ballast system and a cargo oil system. The ballast system includes a first ballast pump and a second ballast pump located on opposite sides of the tanker. The first and second ballast pumps are connected to a ballast water filtration chamber and a cargo oil system filling port, respectively, via a three-way pipeline. Simultaneously, the first and second ballast pumps are activated to pump seawater into a first port-side cargo oil tank and a second starboard-side cargo oil tank, respectively. After the strength tests of the first port-side and second starboard-side cargo oil tanks are completed, the seawater is pumped into the next port-side and starboard-side cargo oil tanks, which are spaced one tank apart. This method is used for strength testing of cargo oil tanks in ships with single-tank, single-pump cargo tanks. By connecting the ballast system to the cargo oil system, seawater can be used for cargo oil tank strength testing during sea trials, shortening the ship's mooring period and improving construction efficiency.

Description

Technical Field

[0001] This invention belongs to the field of marine vessel design and construction, and specifically relates to a strength testing system for cargo oil tankers of product oil tankers. Background Technology

[0002] Currently, most strength tests of cargo oil tankers and ballast tanks on product oil tankers are conducted during the mooring phase. When a vessel is moored, its equipment and systems are generally unusable. This necessitates the use of temporary pumps and pipelines to transport freshwater from shore to the ballast and cargo oil tanks. High-powered pumps are also required to meet the testing requirements, resulting in significant freshwater consumption. Furthermore, related production operations within the tanks are disrupted during the strength test. This presents a significant waste of resources and necessitates the procurement of specialized equipment and pipelines to complete the test. Summary of the Invention

[0003] To address the above problems, this invention provides a method for strength testing of cargo oil tankers on oil tankers, the technical solution of which is as follows:

[0004] A method for strength testing of cargo oil tankers of product oil tankers is disclosed. The product oil tanker is a single-tank, single-pump type, equipped with a ballast system and a cargo oil system. The ballast system includes a first ballast pump and a second ballast pump. The first and second ballast pumps are connected to a ballast water filter via pipelines. The connectors of the first and second ballast pumps connected to the ballast water filter are replaced with tee pipes. The main pipeline of the tee pipe is connected to either the first or second ballast pump and the ballast water filter. A temporary pipeline is installed on a branch pipeline of the tee pipe, and the other end of the temporary pipeline is connected to the cargo oil system filling port.

[0005] The cargo oil system comprises multiple cargo oil tanks and a cargo oil manifold area. The cargo oil manifold area is located within the cargo oil tanks in the middle of the ship. The unused filling ports in the cargo oil manifold area are connected to temporary outboard pipes. Each cargo oil tank includes a port-side cargo oil tank and a starboard-side cargo oil tank. Multiple port-side cargo oil tanks are interconnected by pipelines and connected to the first ballast pump. Each port-side cargo oil tank is equipped with a port-side cargo oil pump. Multiple starboard-side cargo oil tanks are interconnected by pipelines and connected to the second ballast pump. Each starboard-side cargo oil tank is equipped with a starboard-side cargo oil pump.

[0006] The procedure for conducting a strength test on a cargo oil tank is as follows:

[0007] S1: Simultaneously start the first ballast pump and the second ballast pump. Pump seawater into the first port side cargo oil tank through the first ballast pump and into the second starboard cargo oil tank through the second ballast pump. After injecting seawater to the required test water level, conduct a strength test on the current port side cargo oil tank and the current starboard cargo oil tank.

[0008] S2: The strength tests of the first port-side cargo oil tank and the second starboard-side cargo oil tank are completed. Seawater in the first port-side cargo oil tank is pumped into the next port-side cargo oil tank, and at the same time, seawater in the second starboard-side cargo oil tank is pumped into the next starboard-side cargo oil tank for strength testing.

[0009] S3: Following the operation in S2, pump seawater into the next adjacent port and starboard cargo oil tanks. If the pumped seawater does not reach the required test water level, start the corresponding ballast pump to replenish seawater into the port or starboard cargo oil tank.

[0010] S4: After the strength test is completed, seawater is discharged to the outside of the ship through a temporary outboard drain pipe.

[0011] S5: After the seawater is drained, remove the tee pipe and the temporary drain pipe outside the hull, and restore the system to its original state.

[0012] or

[0013] S1: Simultaneously start the first ballast pump and the second ballast pump. Pump seawater into the first port side cargo oil tank through the first ballast pump and into the second starboard cargo oil tank through the second ballast pump. After injecting seawater to the required water level, conduct a strength test on the first port side cargo oil tank and the second starboard cargo oil tank.

[0014] S2: The strength tests of the first port-side cargo oil tank and the second starboard-side cargo oil tank are completed. Seawater in the first port-side cargo oil tank is pumped into the next port-side cargo oil tank, and simultaneously, seawater in the second starboard-side cargo oil tank is pumped into the next starboard-side cargo oil tank. At the same time, the first ballast pump pumps seawater into the port-side cargo oil tank three spaces away from the first port-side cargo oil tank, and the second ballast pump pumps seawater into the starboard-side cargo oil tank three spaces away from the second starboard-side cargo oil tank. Simultaneously, the strength tests are conducted on all four cargo oil tanks.

[0015] S3: If the pumped seawater does not reach the required water level, start the corresponding ballast pump to replenish seawater into the port or starboard cargo oil tanks.

[0016] S4: After the strength test is completed, seawater is discharged to the outside of the ship through a temporary outboard drain pipe.

[0017] S5: After the seawater is drained, remove the tee pipe and the temporary drain pipe outside the hull, and restore the system to its original state.

[0018] Furthermore, in the aforementioned method for testing the strength of cargo oil tankers on oil tankers, the other end of the ballast pump is connected to the seabed suction port, and seawater enters each cargo oil tank through the seabed suction port and the ballast pump.

[0019] Furthermore, in the aforementioned method for strength testing of cargo oil tankers of product oil tankers, each cargo oil tank includes a port-side cargo oil tank and a starboard-side cargo oil tank. The cargo oil manifold area has a port-side manifold area located in the port-side cargo oil tank and a starboard-side manifold area located in the starboard-side cargo oil tank. Both the starboard-side manifold area and the port-side manifold area have multiple cargo oil system filling ports. A temporary pipeline is connected to the first available cargo oil system filling port at the end of the cargo oil manifold area, and a temporary stern pipe is connected to the remaining available cargo oil system filling ports.

[0020] Furthermore, in the aforementioned method for testing the strength of cargo oil tanks on oil tankers, the temporary external discharge pipe is located on the port or starboard side of the vessel.

[0021] Furthermore, the aforementioned method for testing the strength of cargo oil tankers on oil tankers includes six cargo oil tanks arranged sequentially from bow to stern.

[0022] Furthermore, in the aforementioned method for testing the strength of cargo oil tankers of oil tankers, each cargo oil tank has a port cargo oil tank and a starboard cargo oil tank, with a bulkhead installed between the port and starboard cargo oil tanks.

[0023] The beneficial effects of this invention are:

[0024] 1. The method of this invention is applicable to the strength test of cargo oil tanks in ships with single-tank, single-pump cargo holds. By connecting the ballast system to the cargo oil system, seawater can be used to conduct strength tests on the cargo oil tanks during sea trials, which not only shortens the ship's mooring period and improves construction efficiency, but also reduces the waste of freshwater.

[0025] 2. The temporary outboard pipes and temporary connecting pipes used in this method require additional tooling. Apart from that, the pipelines and equipment are all based on existing equipment on board, which will not generate much additional construction cost. In addition, if it is a series of ships being built, such tooling can also be used for subsequent ships. Attached Figure Description

[0026] Figure 1 This is a diagram of the ballast water system of the present invention;

[0027] Figure 2 This is a diagram of the cargo oil system of the present invention;

[0028] Among them: 1-First ballast pump, 2-Second ballast pump, 3-Ballast system, 4-Cargo oil system, 5-Ballast water filtration room, 6-Temporary outboard discharge pipe, 7-Branch pipeline. Detailed Implementation

[0029] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0030] like Figure 1The system shown is a strength testing system for cargo oil tankers of finished oil tankers. This system is suitable for strength testing of cargo oil tanks of ships with single-tank, single-pump configurations.

[0031] Specifically, the product oil tanker cargo oil tank strength test system of the present invention includes a ballast system, a cargo oil system, a temporary connecting pipe, and a temporary outboard discharge pipeline. The ballast system includes two ballast pumps, pipelines and valves connected to the ballast pumps, and the ballast pumps draw seawater from the seabed gate suction port.

[0032] The cargo oil system includes cargo oil pumps for each cargo oil tank, pipelines and valves connected to the cargo oil pumps, and pipelines in the manifold area. The cargo oil tanks are arranged on the left and right sides, with 6 cargo oil tanks (left) and 6 cargo oil tanks (right), as well as two sludge tanks. Each cargo oil tank and sludge tank has a cargo oil pump. All tanks can discharge liquids from their compartments to the manifold area pipelines via the cargo oil pumps, or they can be transferred to other cargo oil tanks via the cargo oil pumps.

[0033] Both the ballast system and the cargo oil system have been installed and commissioned, and the pumps, valves, and pipelines in the systems are all in good working order.

[0034] The steps for conducting strength tests on cargo oil tankers of product oil tankers using the product oil tanker strength testing system of the present invention are as follows:

[0035] S1, install temporary connecting pipes and discharge external piping.

[0036] Connect the port side ballast pump outlet pipeline of the ballast system to the port side NO.6 joint of the cargo oil system manifold area, and connect the starboard side ballast pump outlet pipeline of the ballast system to the cargo oil system pipeline; install two temporary outboard drain pipes 1 on the NO.3 joints of the cargo oil manifold areas on both sides.

[0037] S2, Adjust the status of pipeline accessories in the ballast water system and cargo oil system.

[0038] Ballast water system pipeline Figure 1 Valves BH033V, BH034V, BH017V, BH019V, BH027V, CT106V, CT011V, CT075V, CT197V, CT194V, CT129V, CT010V, and CT071V are open, while all other valves in the system are closed.

[0039] S4 operates two ballast pumps.

[0040] By operating Ballast Pump No. 1, seawater can be... Figure 1From the bottom gate suction inlet, the oil enters the ballast pump via valves BH033V and BH017V, then reaches the No. 6 pipeline in the cargo oil gathering area via BH040V and temporary connecting pipe 1. From there, it enters cargo oil tank No. 6 (left) via valves CT106V, CT011V, and CT076V. By operating ballast pump No. 2, the oil... Figure 1 The oil enters the No. 2 ballast pump via the bottom gate suction port, passing through valves BH034V and BH019V. It then enters the cargo oil system via valves BH041V and BH027V and temporary connecting pipeline 1. Finally, it enters cargo oil tank No. 5 (right) via valves CT197V, CT194V, CT129V, CT010V, and CT071V and pipelines. The strength test is conducted when the liquid levels in the two tanks reach the test level.

[0041] S5, strength tests were conducted on the other two compartments.

[0042] After the strength tests of cargo oil tanks No. 6 (left) and No. 5 (right) are completed, close valves CT076V and CT071V on the injection pipelines of these two strength test cargo oil tanks, open valves CT075V, CT011V, CT131V, CT123V, CT007V, and CT056V leading to cargo oil tank No. 4 (left), and run cargo oil tank No. 6 (left) to transfer the ballast water in cargo oil tank No. 6 (left) to cargo oil tank No. 4 (left); open valves CT070V, CT010V, CT129V, CT121V, CT006V, and CT051V leading to cargo oil tank No. 3 (right), and run the cargo oil pump in cargo oil tank No. 5 (right) to transfer the ballast water in cargo oil tank No. 5 (right) to cargo oil tank No. 3 (right).

[0043] If the liquid level inside the chamber reaches the test level, a strength test will be conducted.

[0044] If the liquid level inside the tank cannot reach the test level, then the ballast water system piping will be... Figure 1 With valves BH033V, BH034V, BH017V, BH019V, BH027V, CT106V, CT131V, CT123V, CT007V, CT056V, CT197V, CT129V, CT010V, and CT071V opened, seawater can be pumped through ballast pump No. 1. Figure 1 From the bottom gate suction inlet, the oil enters the ballast pump via valves BH033V and BH017V, then reaches cargo oil tank No. 6 via BH040V and temporary connecting pipe 1. From there, it enters cargo oil tank No. 4 (left) via valves CT106V, CT131V, CT123V, CT007V, and CT056V. The oil then flows through ballast pump No. 2. Figure 1The oil enters the No. 2 ballast pump via the bottom gate suction port, passing through valves BH034V and BH019V. It then reaches the cargo oil system via valves BH041V and BH027V and temporary connecting pipelines. Finally, it enters the No. 3 cargo oil tank (right) via valves CT197V, CT129V, CT010V, and CT071V and pipelines. The strength test is conducted when the liquid levels in the two tanks reach the test level.

[0045] S6. Repeat step S5 to conduct strength tests on other cargo oil tanks. The tanks undergoing strength tests must be staggered to ensure that all adjacent tanks are empty.

[0046] S7. After all cargo oil tanks in the product tanker have been tested, assuming that the last compartments to undergo strength testing are cargo oil tank No. 1 (left) and cargo oil tank No. 2 (right), open the temporary outboard discharge valves CT025V, CT001V, CT111V, CT119V, and CT100V leading to No. 3 (left) and the temporary outboard discharge valves CT040V, CT004V, CT117V, CT121V, and CT101V leading to No. 3 (right), close all other valves, and run the cargo oil pumps in cargo oil tank No. 1 (left) and cargo oil tank No. 2 (right) to discharge seawater into the sea through the temporary outboard discharge pipes.

Claims

1. A method of testing the strength of a cargo oil tank of a product tanker, characterized in that: The product oil tanker has a single cabin and a single pump, and is provided with a ballast system (3) and a cargo oil system (4), the ballast system is provided with a first ballast pump (1) and a second ballast pump (2), the first ballast pump and the second ballast pump are respectively arranged at two sides of the tanker, the first ballast pump and the second ballast pump are respectively connected with a ballast water filter room (5) through pipelines, the joint of the first ballast pump and the second ballast pump connected with the ballast water filter room is replaced by a tee pipe, the main pipeline of the tee pipe is respectively connected with the first ballast pump or the second ballast pump and the ballast water filter room, and the branch pipeline (7) of the tee pipe is connected with a cargo oil system filling port at the other end; The cargo oil system comprises a plurality of cargo oil tanks and a cargo oil manifold area, the cargo oil manifold area is arranged in a cargo oil tank in the middle of the ship, and a temporary outboard pipe (6) is connected to the idle filling port of the cargo oil manifold area; Each cargo oil tank comprises a portside cargo oil tank and a starboard cargo oil tank, a plurality of portside cargo oil tanks are connected with each other through pipelines and connected with the first ballast pump through pipelines, and a left cargo oil pump is arranged in each portside cargo oil tank, a plurality of starboard cargo oil tanks are connected with each other through pipelines and connected with the second ballast pump through pipelines, and a right cargo oil pump is arranged in each starboard cargo oil tank; The operation of the cargo oil tank strength test is as follows: S1: simultaneously start the first ballast pump and the second ballast pump, pump seawater into the first portside cargo oil tank through the first ballast pump and pump seawater into the second starboard cargo oil tank through the second ballast pump, after the seawater reaches the required test water level, perform the strength test on the current portside cargo oil tank and the current starboard cargo oil tank; S2: after the strength test of the first portside cargo oil tank and the second starboard cargo oil tank is completed, the seawater in the first portside cargo oil tank is pumped into the left cargo oil tank which is one tank away, at the same time, the seawater in the second starboard cargo oil tank is pumped into the right cargo oil tank which is one tank away, and the strength test is performed; S3: according to the operation of S2, the seawater is pumped into the next left cargo oil tank and right cargo oil tank which are one tank away respectively, if the seawater does not reach the required test water level, the corresponding ballast pump is started to supplement the seawater in the left cargo oil tank or the right cargo oil tank; S4: after the strength test is completed, the seawater is discharged to the outside of the ship through the temporary outboard pipe; S5: after the seawater is discharged, the tee pipe and the temporary outboard pipe are removed, and the system is restored to the original state; Or S1: simultaneously start the first ballast pump and the second ballast pump, pump seawater into the first portside cargo oil tank through the first ballast pump and pump seawater into the second starboard cargo oil tank through the second ballast pump, after the seawater reaches the required water level, perform the strength test on the first portside cargo oil tank and the second starboard cargo oil tank; S2: After the strength test of the first portside cargo oil tank and the second starboard cargo oil tank is completed, the seawater in the first portside cargo oil tank is pumped into the portside cargo oil tank which is separated by one tank, at the same time, the seawater in the second starboard cargo oil tank is pumped into the starboard cargo oil tank which is separated by one tank, at the same time, the first ballast pump pumps seawater into the portside cargo oil tank which is separated by three tanks from the first portside cargo oil tank, at the same time, the second ballast pump pumps seawater into the starboard cargo oil tank which is separated by three tanks from the second starboard cargo oil tank, at the same time, the strength test of the four cargo oil tanks is carried out; S3: If the seawater pumped does not reach the required water level, the corresponding ballast pump is started to supplement seawater into the portside cargo oil tank or the starboard cargo oil tank; S4: After the strength test is completed, the seawater is discharged to the outside of the ship through the temporary overboard pipe; S5: After the seawater is discharged, the tee pipe and the temporary overboard pipe are removed, and the system is restored to its original state.

2. A method of testing the strength of a cargo tank of a product oil tanker as defined in claim 1, characterized in that: The other end of the first ballast pump and the second ballast pump is connected with the sea chest suction, and the seawater enters each cargo oil tank through the first ballast pump or the second ballast pump through the sea chest suction.

3. A method of testing the strength of a cargo tank of a product oil tanker as defined in claim 1, characterized in that: Each cargo oil tank includes a portside cargo oil tank and a starboard cargo oil tank, and the cargo oil manifold area is provided with a portside manifold area located in the portside cargo oil tank and a starboard manifold area located in the starboard cargo oil tank, the starboard manifold area and the portside manifold area are each provided with a plurality of cargo oil system filling ports, the temporary pipeline is connected with the first idle cargo oil system filling port at the end of the cargo oil manifold area, and the temporary overboard stern pipe is connected with the remaining idle cargo oil system filling ports.

4. A method of testing the strength of a cargo tank of a product oil tanker as defined in claim 1, characterized in that: The temporary overboard pipe is located on the portside or starboard of the ship.

5. A method of testing the strength of a cargo tank of a finished oil tanker as defined in claim 1, characterized in that: Six cargo oil tanks are sequentially arranged from the bow to the stern of the ship.

6. A method of testing the strength of a cargo tank of a product oil tanker as defined in claim 5, characterized in that: Each cargo oil tank has a left cargo oil tank and a right cargo oil tank, and a bulkhead is arranged between the left cargo oil tank and the right cargo oil tank.

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