JP2013024119A - Shaft lubricating water supply line and foreign substance removing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a flow rate control valve or a flowmeter from being clogged with a foreign substance, the flow rate control valve or the flowmeter being provided in a shaft lubricating water supply branch pipe of a shaft lubricating water supply line which supplies seawater to a shaft seal part of a seawater pump.SOLUTION: A shaft lubricating water supply line 30 is branched from a seawater supply line which supplies seawater to a cooling target through a seawater pump, takes out a part of seawater from the seawater supply line and supplies the seawater to a shaft seal part of the seawater pump. The shaft lubricating water supply line 30 includes: a shaft lubricating water supply main pipe 31 which is connected to a seawater supply main pipe of the seawater supply line; and shaft lubricating water supply branch pipes 32-35 which are branched from the shaft lubricating water supply main pipe 31 and connected to the shaft seal part of seawater pumps 3-6. In a terminal of the shaft lubricating water supply main pipe 31, a foreign substance removal line 45 is provided which captures and removes a foreign substance flowing from the seawater supply main pipe into the shaft lubricating water supply main pipe 31.

Description

  The present invention relates to a shaft lubrication water supply line and a foreign matter removal method, and more particularly to a shaft lubrication effective for removing foreign matters such as shellfish from a shaft lubrication water supply line that supplies seawater to a shaft seal portion of an LNG vaporizer seawater pump. The present invention relates to a water supply line and a foreign matter removing method.

  In a thermal power plant such as a combined cycle power plant using LNG (liquefied natural gas) as fuel, in order to generate fuel gas (natural gas) to be supplied to the boiler, a plurality of LNG vaporizer seawater pumps are used to remove the fuel gas from the intake tank. Seawater is sucked up, and this seawater is supplied to the LNG vaporizer through the LNG vaporizer seawater strainer of the seawater supply line as a heat source for vaporization, and heat is generated between the LNG (liquefied natural gas) flowing inside the heat transfer pipe of the LNG vaporizer. By exchanging, LNG (liquefied natural gas) is gasified (vaporized).

  Since the LNG vaporizer seawater pump used in the seawater supply line for supplying seawater to such an LNG vaporizer uses a cutless bearing that requires cooling at the shaft seal, it is in the middle of the seawater supply line (LNG vaporizer A shaft lubrication water supply line branched from the downstream side of the seawater strainer is provided, and a part of the seawater from the seawater supply line is supplied to each LNG vaporizer via the shaft lubrication water strainer provided in the middle of the shaft lubrication water supply line. It is supplied to the shaft seal of the seawater pump.

  In addition, in case the seawater flow rate from the seawater supply line is insufficient, an industrial water supply line that is separate from the shaft lubrication water supply line is provided. Industrial water is replenished from the water supply line to the shaft seal of each LNG vaporizer seawater pump.

  By the way, in the shaft lubricating water supply line that supplies seawater to the shaft seal portion of the LNG vaporizer seawater pump having the above-described configuration, the seawater sucked up by the LNG vaporizer seawater pump from the intake tank is supplied to the seawater supply line. Foreign matter such as shellfish contained in the seawater is removed by passing through the LNG vaporizer seawater strainer provided in the middle and the shaft lubricating water strainer provided in the middle of the shaft lubricating water supply line. In addition, foreign matter such as shellfish that has passed through the LNG vaporizer seawater strainer and shaft lubrication water strainer flows into the shaft seal side of each LNG vaporizer seawater pump. A flow meter that measures the flow rate of seawater to the shaft seal, a flow rate control valve that regulates the flow rate of seawater, and the like are clogged. For this reason, since it becomes impossible to accurately confirm the flow rate of seawater from the shaft lubricating water supply line and the industrial water flow rate from the industrial water supply line, each LNG vaporizer seawater pump is stopped, It is necessary to clean the clogged portion of the flow meter and remove foreign matter such as shellfish, which is very laborious.

  In order to deal with the above-described problems, Patent Document 1 includes a filter for removing the shellfish in the seawater in the shaft lubricating water line of the seawater circulation pump, and the slit of the filter. The width is set to 500 μm or less, and further, a booster pump for maintaining the flow rate of the lubricating water line at 2 m / s or more is provided to prevent the shell from adhering to the axial lubricating water line of the seawater circulation pump. Technology is disclosed.

  In Patent Document 2, an injection pipe composed of an inverted U-shaped pipe is provided in a seawater supply pipe to a shaft cooling pump, an aeration pipe is provided at a lower outlet side of the injection pipe, and carbon dioxide gas is supplied from a carbon dioxide cylinder. A technology configured to prevent the sea creatures from attaching to the axially cooled seawater supply pipe or axially cooled pump and growing into shells by injecting into the injection pipe through the diffuser and setting the pH of the seawater to a predetermined value. Is disclosed.

JP 9-94414 A Japanese Patent Laid-Open No. 11-319853

  However, even if the technology disclosed in Patent Documents 1 and 2 is applied to a shaft lubrication water supply line that supplies a part of seawater from the seawater supply line to the LNG vaporizer seawater pump, it is supplied to the LNG vaporizer seawater pump. It is impossible to completely prevent clogging of foreign matter such as shellfish in a flow meter that measures the flow rate of seawater and a flow rate control valve that regulates the flow rate.

  The present invention has been made in view of the above-described conventional problems, and it is possible to completely prevent foreign matter such as shellfish from being clogged in a flow meter, a flow control valve, etc. of an axial lubricating water supply line that supplies seawater to a seawater pump. An object of the present invention is to provide a shaft lubricating water supply line and a foreign matter removing method that can be prevented.

In order to solve the above problems, the present invention employs the following means.
That is, the present invention is a shaft lubrication water supply that is branched from a seawater supply line that supplies seawater to the object to be cooled by a seawater pump, takes a part of the seawater from the seawater supply line, and supplies it to the shaft seal portion of the seawater pump. The shaft lubrication water supply line includes a shaft lubrication water supply main connected to a seawater supply main of the seawater supply line, and a shaft seal of the seawater pump branched from the shaft lubrication water supply main. And a foreign matter removal unit that captures and removes foreign matter that flows into the axial lubricating water main from the seawater supply main at the end of the main lubricating water supply main. A line is provided.

  According to the shaft lubricating water supply line of the present invention, foreign matter that flows into the shaft lubricating water supply main from the seawater supply main is led to the foreign matter removal line from the shaft lubricating water supply main by the law of inertia, and the foreign matter removal line Will be captured. Therefore, the foreign matter that has flowed into the shaft lubricating water supply main pipe does not flow into the shaft lubricating water supply branch pipe, and the foreign matter adheres to the flow rate control valve, flow meter, etc. of the shaft lubricating water supply branch pipe and is clogged. No foreign matter can be removed from the foreign matter removal line without stopping the seawater pump.

  In the present invention, the foreign matter removal line includes a foreign matter removal main connected to the shaft lubricating water supply main, and an open / close valve that opens and closes between the foreign matter removal main and the shaft lubricating water main. It is good also as having.

According to the shaft lubricating water supply line of the present invention, the seawater from the shaft lubricating water supply main is guided to the foreign matter removing main with the open / close valve between the foreign material removing main and the shaft lubricating water main opened. By discharging the foreign matter as the dummy water from the end of the foreign matter removal main pipe, the foreign matter can be guided from the shaft lubricating water supply main to the foreign matter removal main and attached to each part of the foreign matter removal main.
In addition, when removing foreign matter that has adhered to each part of the foreign matter removal main pipe and captured, the foreign matter captured by the foreign matter removal line can be removed without stopping the seawater pump by closing the open / close valve. can do.

  Further, in the present invention, a flow rate adjusting valve and a flow meter may be provided on the downstream side of the opening / closing valve of the foreign matter removal main pipe.

  According to the shaft lubricating water supply line of the present invention, foreign matter that has flowed into the foreign matter removal main through the on-off valve from the shaft lubricating water supply main adheres to and is captured by each part such as a flow control valve and a flow meter. Therefore, by setting the open / close valve in a closed state, foreign matter adhering to the flow rate adjusting valve, the flow meter, etc. can be cleaned and removed without stopping the seawater pump.

  Furthermore, in the present invention, the seawater pump is an LNG vaporizer seawater pump, and the cooling target is an LNG vaporizer.

  According to the shaft lubricating water supply line of the present invention, the foreign matter that has flowed into the shaft lubricating water supply line branched from the seawater supplying line that supplies seawater to the LNG vaporizer is removed from the shaft lubricating water supply line according to the law of inertia. It is guided to the foreign matter removal line through the lubricating water supply main and is removed by being captured by the foreign matter removal line.

  Furthermore, the present invention provides a shaft lubricating water that is branched from a seawater supply line that supplies seawater to the object to be cooled by the seawater pump, takes a part of the seawater from the seawater supply line, and supplies it to the shaft seal portion of the seawater pump. A foreign matter removing method for removing foreign matter from a supply line, wherein the shaft lubrication water supply line includes a shaft lubrication water supply main connected to a seawater supply main of the seawater supply line, and the shaft lubrication water supply main A shaft lubrication water supply branch pipe branched from the seawater pump and connected to the shaft seal of the seawater pump, a foreign matter removal line is provided at the end of the shaft lubrication water supply main pipe, and the shaft lubrication from the seawater supply main pipe The foreign matter that has flowed into the water supply main is guided from the shaft lubricating water supply main to the foreign matter removal line, and is attached to and captured by each part of the foreign matter removal line.

  As described above, according to the shaft lubricating water supply line and the foreign matter removal method of the present invention, foreign matter that has flowed into the shaft lubricating water supply line from the seawater supply line can be guided to the foreign matter removal line and captured. The foreign matter captured from the foreign matter removal line can be removed without stopping the seawater pump.

It is a systematic diagram of one embodiment of a shaft lubrication supply line according to the present invention. It is an enlarged view of the A section of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an embodiment of a shaft lubricating water supply line and a foreign matter removing method according to the present invention. The shaft lubricating water supply line 30 and the foreign matter removal method of the present embodiment can be applied to a thermal power plant such as a combined cycle power plant using LNG (liquefied natural gas) as a fuel. It is effective to remove foreign substances such as shellfish from the seawater 2 that cools the shaft seal 9 of the LNG vaporizer seawater pumps 3 to 7.

  For example, as shown in FIG. 1, the thermal power plant sucks up seawater 2 from a water intake tank 1 using LNG vaporizer seawater pumps 3 to 7, and supplies seawater 2 to the LNG vaporizers 10 and 11 as a heat source for vaporization. A part of the seawater 2 is taken out from the line 16 and the seawater supply line 16, and the seawater 2 is supplied to the shaft sealing part 9 of the LNG vaporizer seawater pumps 3 to 6 as the shaft lubricating water. An industrial water supply line for supplying industrial water to the shaft seals 9 of the LNG vaporizer seawater pumps 3 to 6 when the flow rate of the seawater 2 from the seawater supply line 16 to the shaft lubricating water line 30 is insufficient. 37 is provided.

  The intake tank 1 is provided with five LNG vaporizer seawater pumps (first to fifth LNG vaporizer seawater pumps 3 to 7), and these five LNG vaporizer seawater pumps (first to fifth LNG vaporizer seawater pumps). LNG vaporizer seawater pumps 3 to 7) are connected to two LNG vaporizers (first and second LNG vaporizers 10 and 11) via a seawater supply line 16.

  Of the five LNG vaporizer seawater pumps (first to fifth LNG vaporizer seawater pumps 3 to 7), four LNG vaporizer seawater pumps (first to fourth LNG vaporizer seawater pumps 3 to 6) ), A cutless bearing that requires cooling is used for the shaft seal 9, and the remaining one LNG vaporizer seawater pump (fifth LNG vaporizer seawater pump 7) is cooled by the shaft seal 9. Bearings that do not need to be used are used.

  The seawater supply line 16 includes a first seawater supply main pipe 17 connected to the first LNG vaporizer 10, a second seawater supply main pipe 18 connected to the second LNG vaporizer 11, and each LNG. First to fifth seawater supply branch pipes 19 to 23 connecting the discharge ports 8 of the vaporizer seawater pumps 3 to 7 and the first seawater supply main pipe 17, respectively, and the seawater supply branch pipes 19 to 23 And the second seawater supply main pipe 18 are provided with first to fifth seawater supply branch pipes 24 to 28.

  LNG vaporizer seawater strainers (first and second LNG vaporizer seawater strainers 12, 13) are provided in the middle of the first seawater supply main pipe 17 and the second seawater supply main pipe 18, respectively. Seawater sucked from the intake tank 1 by the LNG vaporizer seawater pump (first to fifth LNG vaporizer seawater pumps 3 to 7) and led to the first seawater supply main pipe 17 and the second seawater supply main pipe 18 2 is passed through these LNG vaporizer seawater strainers (first and second LNG vaporizer seawater strainers 12, 13), and part of foreign matter such as shellfish contained in the seawater 2 is captured.

  The seawater supply branch pipes (the first to fifth seawater supply branch pipes 19 to 23) are upstream of the seawater supply branch pipes (first to fifth seawater supply branch pipes 19 to 23) (the discharge port 8 side of each LNG vaporizer seawater pump 3 to 7). Opening / closing valves (first to fifth opening / closing valves AV1 to AV5) for opening and closing the first to fifth seawater supply branch pipes 19 to 23) are provided.

  On the downstream side of each seawater supply branch pipe (first to fifth seawater supply branch pipes 19 to 23), the seawater flowing through each seawater supply branch pipe (first to fifth seawater supply branch pipes 19 to 23) Flow rate adjusting valves (first to fifth flow rate adjusting valves V1 to V5) for adjusting the flow rate are provided.

  Each seawater supply branch pipe (first to fifth seawater supply branch pipes 24 to 28) has a flow rate of seawater 2 flowing through each seawater supply branch pipe (first to fifth seawater supply branch pipes 24 to 28). Flow control valves (sixth to tenth flow control valves V6 to V10) to be adjusted are respectively provided.

  On the upstream side and the downstream side of the first LNG vaporizer seawater strainer 12 of the first seawater supply main pipe 17, a flow rate adjusting valve (11th) for adjusting the flow rate of the seawater 2 flowing through the first seawater supply main pipe 17. , Twelfth flow rate adjusting valves V11, V12) are provided respectively.

  On the upstream and downstream sides of the second LNG vaporizer seawater strainer 13 of the second seawater supply main pipe 18, a flow rate adjustment valve (13th, adjusting the flow rate of the seawater 2 flowing through the second seawater supply main pipe 18. Fourteenth flow rate adjusting valves V13, V14) are respectively provided.

  The shaft lubricating water supply line 30 is provided between the first LNG vaporizer seawater strainer 12 and the twelfth flow rate adjusting valve V12 of the first seawater supply main pipe 17 and the second seawater supply main pipe 18 of the second seawater supply main pipe 18. The LNG vaporizer seawater strainer 13 and the fourteenth flow rate control valve V14 are branched from the shaft lubricating water supply main pipe 31 and the shaft lubricating water supply main pipe 31 to be branched from each LNG vaporizer seawater pump (first To shaft lubricating water supply branch pipes (first to fourth shaft lubricating water supply branch pipes 32 to 35) connected to the shaft seal portions 9 of the fourth to fourth LNG vaporizer seawater pumps 3 to 6), respectively. Yes.

  The first seawater supply main pipe 17 and the second seawater supply pipe are connected to the connecting portion of the shaft lubricating water supply main pipe 31 with the first seawater supply main pipe 17 and the second seawater supply main pipe 18. Flow control valves (fifteenth and sixteenth flow control valves V15 and V16) for adjusting the flow rate of the seawater 2 from the supply main pipe 18 to the shaft lubricating water supply main pipe 31 are provided.

  The shaft lubricating water supply main pipe 31 is branched into two at the downstream side of the fifteenth and sixteenth flow control valves V15, V16, and the shaft lubricating water strainer (first, second, Shaft lubricating water strainers 14, 15) are provided respectively. A flow rate adjusting valve (first flow adjusting valve) for adjusting the flow rate of the seawater 2 flowing therethrough is provided on the upstream side and the downstream side of each shaft lubricating water strainer (first and second shaft lubricating water strainers 14, 15) of each branching portion. 17 to 20th flow rate adjusting valves V17 to V20) are provided.

  Each shaft lubricating water supply branch pipe (first to fourth shaft lubricating water supply branch pipes 32 to 35) includes a flow control valve (21st to 24th flow control valves V21 to V24) and a flow meter (first To fourth flow meters FX1 to FX4) are respectively supplied from the shaft lubricating water supply main pipe 31 to the shaft lubricating water supply branch pipes (first to fourth shaft lubricating water supply branch pipes 32 to 35). The LNG vaporizer seawater pump (the LNG vaporizer seawater pump (the first to fourth flowmeters FX1 to FX4) and the LNG vaporizer seawater pumps (the first to fourth flowmeters V21 to V24) and the flow rate control valves ( It is supplied to the shaft seal portion 9 of the first to fourth LNG vaporizer seawater pumps 3 to 6).

  The industrial water supply line 37 is branched from the industrial water supply main pipe 38 connected to the industrial water supply source 36 and the industrial water supply main pipe 38, and each of the lubricating water supply branch pipes (first to fourth shafts). The flow control valves (21st to 24th flow control valves V21 to V24) and the flow meters (1st to 4th flow meters FX1 to FX4) of the lubricating water supply branch pipes 32 to 35 are respectively connected. Industrial water supply branch pipes (first to fourth industrial water supply branch pipes 39 to 42).

  In the upstream portion of each industrial water supply branch pipe (first to fourth industrial water supply branch pipes 39 to 42), each industrial water supply branch pipe (first to fourth industrial water supply branch pipes 39 to 42), the flow rate adjusting valves (25th to 28th flow rate adjusting valves V25 to V28) for adjusting the flow rate of the industrial water flowing therethrough are provided.

  In the middle part of each industrial water supply branch pipe (first to fourth industrial water supply branch pipes 39 to 42), each industrial water supply branch pipe (first to fourth industrial water supply branch pipes 39 to 42) is provided. Open / close valves (sixth to ninth open / close valves AV6 to AV9) are provided.

  By operating each LNG vaporizer seawater pump (first to fifth LNG vaporizer seawater pumps 3 to 7) having the seawater supply line 16 having the above-described configuration, the seawater 2 is sucked up from the intake tank 1. , Discharge from each discharge port 8 of each LNG vaporizer seawater pump (first to fifth LNG vaporizer seawater pumps 3-7) to each seawater supply branch pipe (first to fifth seawater supply branch pipes 19-23) The seawater supply branch pipes (first to fifth seawater supply branch pipes 19 to 23) are led to the first seawater supply main pipe 17, or the seawater supply branch pipes (first to fifth seawater supply pipes). The first seawater supply main pipe is led from the branch pipes 19 to 23) to the second seawater supply main pipe 18 via the seawater supply branch pipes (first to fifth seawater supply branch pipes 24 to 28). 17 and the second seawater supply main 18 through each LNG vaporizer (first and second LNG vaporizers 10, 1 ) Is supplied to.

  A part of the seawater 2 supplied to the first seawater supply main pipe 17 and the second seawater supply main pipe 18 is axially lubricated from the first seawater supply main pipe 17 and the second seawater supply main pipe 18. Guided to the shaft lubricating water supply main pipe 31 of the water supply line 30 and led from the shaft lubricating water supply main pipe 31 to each shaft lubricating water supply branch pipe (first to fourth shaft lubricating water supply branch pipes 32 to 35). The LNG vaporizer seawater pumps (first to fourth LNG vaporizer seawater pumps 3 to 6) are connected to the respective lubricating oil supply branch pipes (first to fourth axial lubricating water supply branch pipes 32 to 35). ).

  Furthermore, when the flow rate of the seawater 2 supplied from the seawater supply line 16 to the shaft lubricating water supply line 30 is insufficient, industrial water is supplied from the industrial water supply source 36 of the industrial water supply line 37 to the industrial water supply main 38. The industrial water is led from the industrial water supply main pipe 38 to each industrial water supply branch pipe (first to fourth industrial water supply branch pipes 39 to 42), and each industrial water supply branch pipe (first to first 4 industrial water supply branch pipes 39 to 42) are led to the respective shaft lubricating water supply branch pipes (first to fourth axial lubricating water supply branch pipes 32 to 35), and each axial lubricating water supply branch pipe (first To the shaft seal portion 9 of each of the LNG vaporizer seawater pumps (first to fourth LNG vaporizer seawater pumps 3 to 6).

  In the present embodiment, as shown in FIG. 2, a foreign matter removal line 45 is connected to the end side of the shaft lubricating water supply main pipe 31 of the shaft lubricating water supply line 30. Foreign matters such as shellfish that have passed through the water strainers (first and second shaft lubricating water strainers 14 and 15) and have flowed into the shaft lubricating water supply main pipe 31 are captured and removed. The lubricating water supply main pipe 31 is prevented from flowing into the shaft lubricating water supply branch pipes (first to fourth shaft lubricating water supply branch pipes 32 to 35).

  The foreign matter removal line 45 has a foreign matter removal main pipe 46 connected to the end of the shaft lubricating water supply main pipe 31 and a foreign matter cleaning valve V30 for opening and closing the foreign matter removal main pipe 46 provided upstream of the foreign matter removal main pipe 46. The flow rate adjusting valve V31 is provided on the downstream side of the foreign matter cleaning valve V30, and the flow meter FX5 is provided on the downstream side of the flow rate adjusting valve V31.

  With the foreign matter cleaning valve V30 of the foreign matter removal line 45 opened, the seawater 2 flowing through the shaft lubricating water supply main pipe 31 is guided to the foreign substance removal main pipe 46, and this seawater 2 is used as dummy water from the end of the foreign substance removal main pipe 46. By discharging, foreign matters such as shellfish that have passed through the shaft lubricating water strainers 14 and 15 and flowed into the shaft lubricating water supply main pipe 31 are guided to the foreign substance removal main pipe 46, and the flow rate adjusting valve V 31 of the foreign substance removal line 45 is introduced. It can be attached to the flow meter FX5 or the like and captured.

  In the shaft lubrication water supply line 30 and the foreign matter removal method of the present embodiment configured as described above, the foreign matter removal line 45 is provided at the end of the shaft lubrication water supply main pipe 31 of the shaft lubrication water supply line 30, By opening the foreign matter cleaning valve V30 of the foreign matter removal line 45, the seawater 2 is guided from the shaft lubricating water supply main pipe 31 to the foreign substance removal main pipe 46 according to the law of inertia, and the end of the foreign substance removal main pipe 46 is introduced. Can be drained as dummy water.

  Accordingly, foreign matters such as shellfish that have passed through the shaft lubricating water strainers 14 and 15 and have flowed into the shaft lubricating water supply main pipe 31 are led from the shaft lubricating water supply main pipe 31 to the foreign substance removing main pipe 46, and the foreign substance removing line 45. Can be attached to and captured by the flow control valve V31, the flow meter FX5, etc., so that foreign matters such as shellfish that have flowed into the shaft lubricating water supply main pipe 31 are separated from each shaft lubricating water branch pipe (first to fourth shafts). It does not flow into the lubricating water supply manifolds 32-35).

  As a result, when removing foreign matter such as shellfish from the foreign matter removal line 45, each foreign LNG vaporizer seawater pump (first to fourth LNG vaporizer seawater pumps) is set by closing the foreign matter cleaning valve V30. Without stopping 3-6), foreign matter such as trapped shellfish adhered to the flow rate adjusting valve V31 of the foreign matter removal line 45, the flow meter FX5, etc. can be removed.

  In the above description, the shaft lubrication water supply line and the foreign matter removal method according to the present invention are the same as the shaft lubrication water supply line branched from the seawater supply line for supplying seawater to the LNG vaporizer by the LNG vaporizer seawater pump. However, the present invention may be applied to shaft lubrication water supply lines of other facilities such as thermal power plants and other facilities such as nuclear power plants. Play.

DESCRIPTION OF SYMBOLS 1 Intake tank 2 Seawater 3-7 1st-5th LNG vaporizer seawater pump 8 Discharge port 9 Shaft seal part 10 1st LNG vaporizer 11 2nd LNG vaporizer 12 1st LNG vaporizer seawater strainer 13 Second LNG vaporizer seawater strainer 14 First shaft lubricating water strainer 15 Second shaft lubricating water strainer 16 Seawater supply line 17 First seawater supply main 18 Second seawater supply main 19-23 First to first Fifth seawater supply branch pipes 24-28 First to fifth seawater supply branch pipes 30 Axis lubrication water supply line 31 Axis lubrication water supply mains 32-35 Axis lubrication water supply branch pipes 36 Industrial water sources 37 Industrial water supply Line 38 Industrial water supply main 39 to 42 Industrial water supply branch 45 Foreign matter removal line 46 Foreign matter removal main AV1 to AV9 1st to 9th open / close bubbles V1 to V28 1st to 28th flow control bars Bed V30 foreign substance cleaning valve V31 flow control valve FX1~FX4 first to fourth flow meter FX5 flowmeter

Claims (5)

A shaft lubrication water supply line that is branched from a seawater supply line that supplies seawater to the object to be cooled by the seawater pump, takes a part of the seawater from the seawater supply line, and supplies it to the shaft seal portion of the seawater pump,
The shaft lubrication water supply line is connected to the seawater supply main of the seawater supply line, and is branched from the shaft lubrication water supply main and connected to the shaft seal of the seawater pump. A shaft lubricating water supply branch pipe,
A shaft lubrication water supply line characterized in that a foreign matter removal line is provided at the end of the shaft lubrication water supply main to capture and remove foreign matter that flows into the shaft lubrication water main from the seawater supply main.   The foreign matter removal line includes a foreign matter removal main connected to the shaft lubricating water supply main, and an open / close valve that opens and closes between the foreign matter removal main and the shaft lubricating water supply main. The shaft lubricating water supply line according to claim 1.   The shaft lubricating water supply line according to claim 2, wherein a flow rate adjusting valve and a flow meter are provided on the downstream side of the opening / closing valve of the foreign matter removing main pipe.   The shaft lubricating water supply line according to any one of claims 1 to 3, wherein the seawater pump is an LNG vaporizer seawater pump, and the cooling target is an LNG vaporizer. Branched off from the seawater supply line that supplies seawater to the object to be cooled by the seawater pump, a part of the seawater is taken out from the seawater supply line, and foreign matter is removed from the shaft lubricating water supply line that is supplied to the shaft seal portion of the seawater pump A foreign matter removing method,
The shaft lubrication water supply line is connected to the seawater supply main pipe connected to the seawater supply main of the seawater supply line, and is branched from the shaft lubrication water supply main and connected to the shaft seal portion of the seawater pump. A shaft lubricating water supply branch pipe,
A foreign matter removal line is provided at the end of the shaft lubrication water supply main, and the foreign matter that has flowed into the shaft lubrication water supply main from the seawater supply main is led to the foreign matter removal line from the shaft lubrication water supply main, A foreign matter removing method characterized by being attached to and captured by each part of the foreign matter removal line.

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