Flushing method for fuel and oil lines of low-speed diesel engines

Abstract

A flushing method for a fuel pipeline and a lubricating oil pipeline of a low-speed diesel engine comprises: connecting the fuel pipeline and the lubricating oil pipeline respectively through a flushing hose and a pipeline connecting tool, flushing them uniformly, removing impurities in the flushing oil by using a filter, increasing the flushing speed by using a vibrator, shortening the flushing time, improving the flushing quality, and confirming the flushing effect by using a flushing inspection bucket. The present invention meets the need for flushing the inside of the pipeline before debugging the main engine of a low-speed diesel engine, improves the cleanliness of the inside of the oil pipeline, avoids the occurrence of damage to the main engine parts caused by residual particulate impurities in the pipeline, and achieves the effects of high efficiency, reliability, convenience, and labor saving.

Description

Technical Field

[0001] The invention relates to flushing of oil pipelines of marine diesel engines, in particular to a flushing method for fuel pipelines and lubricating oil pipelines of low-speed diesel engines, belonging to the technical field of diesel engine manufacturing. Background Art

[0002] After the main engine of a marine low-speed diesel engine is assembled, there may be fine particles in the pipeline, which will be embedded in the bearing alloy with the oil flow, causing the journal to be scratched, making the bearing easy to damage. Obviously, the more particles embedded in the bearing alloy, the greater the degree of scratching, making the journal rougher.

[0003] If the roughness of the journal increases to a certain limit, the bearing alloy will be scratched and the bearing alloy may be squeezed out, thereby changing or destroying the lubrication conditions of the bearing and causing the bearing to fail.

[0004] At present, there is no method for flushing the oil pipes of various types of marine diesel engines. In order to ensure that no tiny particles in the pipes enter the main engine during main engine commissioning and cause damage to important parts of the main engine, a reliable and effective oil pipe flushing solution is needed to meet the need to remove impurities in the oil pipes. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned problems of the prior art and provide a flushing method for the fuel pipeline and lubricating oil pipeline of a low-speed diesel engine, so as to effectively and reliably remove impurities in the oil pipeline and prevent metal microparticles such as iron filings and welding slag in the pipeline from entering the important parts of the main engine during the commissioning stage of the low-speed diesel engine and causing damage to the parts.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A method for flushing fuel pipelines and lubricating oil pipelines of a low-speed diesel engine, comprising:

[0008] A. The method of flushing the fuel line includes the following steps:

[0009] 1) Cut off the connection between each fuel inlet branch pipe and fuel return branch pipe and the fuel pump, and use a flushing hose and a pipeline connection tool to connect the fuel inlet branch pipe and the fuel return branch pipe to form a flushing pipeline to ensure that the fuel does not enter the fuel pump during the flushing stage;

[0010] 2) Connecting the main engine fuel external interface with the flushing pipeline through the fuel inlet main pipe and the fuel return main pipe, and installing a flushing inspection bucket on the fuel return main pipe;

[0011] 3) Turn on the boost pump to maintain the pressure on the fuel inlet manifold at 3-4 bar;

[0012] 4) Installing a vibrator on the flushing pipeline to quickly shake off the granular impurities in the flushing pipeline and flush them away with the oil flow, thereby shortening the flushing time and improving the flushing quality, and maintaining the normal operation of the vibrator during the flushing process;

[0013] 5) Use a wooden hammer to intermittently strike the connection between each fuel inlet branch pipe and the fuel return branch pipe and the fuel return main pipe;

[0014] 6) After four hours, the flushing is stopped, and an inspection bag is installed in the flushing inspection barrel. After that, the flushing is continued for 2 hours, and then the oil is stopped for flushing. The inspection barrel is opened and the inspection bag is visually inspected. If there are no visible hard particles in the inspection bag, the flushing requirements are met;

[0015] 7) If the state inside the inspection bag does not meet the flushing requirements, the inspection bag is replaced and flushing is continued for 2 hours, and then the new inspection bag is retested until the state inside the inspection bag meets the flushing requirements;

[0016] 8) After flushing is completed, remove the flushing hose and reinstall the fuel inlet branch pipe and fuel return branch pipe of the main engine;

[0017] 9) Remove the flushing inspection barrel and reinstall the main engine fuel external interface pipeline;

[0018] B. The flushing method of the lubricating oil pipeline includes the following steps:

[0019] 1) Install the flushing seal plate and pipeline connection tooling, install a blind plate on the main bearing oil inlet flange, and bypass the main bearing lubricating oil;

[0020] 2) Insert a sealing plate at the free end of the axial shock absorber oil pipe to seal it;

[0021] 3) Disconnect the connection between the oil inlet rocker arm and the crosshead, place the oil inlet rocker arm vertically downward and install a filter to prevent the oil from splashing, then fix the oil inlet rocker arm to the frame with wire to prevent impurities from accumulating in the oil circuit;

[0022] 4) Remove the flange cover at the end of the crosshead oil main pipe, connect the flushing inspection bucket, and then return it to the oil pan or the oil return pipe;

[0023] 5) Disconnect the oil inlet pipe from the supercharger, and seal the cylinder oil branch pipe in the common rail with a blind plate;

[0024] 6) Use a flushing hose to connect the 1# supercharger oil inlet pipe to the cylinder oil inlet pipe, and use a flushing hose to connect the other end of the cylinder oil inlet pipe to the 3# supercharger oil return pipe.

[0025] 7) Use a flushing hose to connect the 3# supercharger oil inlet pipe to another cylinder oil inlet pipe, and the other end of the cylinder oil inlet pipe is connected to the 1# supercharger oil return pipe with a flushing hose;

[0026] 8) Use a flushing hose to connect the 2# supercharger oil inlet pipe to the 2# supercharger oil return pipe;

[0027] 9) Disconnect the thrust bearing oil inlet branch pipe flange and install the bypass plate;

[0028] 10) Disconnect the gearbox oil inlet branch pipe, the fuel pump lubricating oil inlet main pipe and the oil pump oil inlet branch pipe;

[0029] 11) Use a flushing hose to connect the gearbox oil inlet branch pipe to the fuel pump oil inlet main pipe;

[0030] 12) Use the flushing hose and pipeline connection tool to connect the fuel pump oil inlet main pipe to the oil pump oil inlet branch pipe;

[0031] 13) The lubricating oil is connected to the return oil main of the auxiliary machine system through a pipeline;

[0032] 14) Install a sampling valve on the pipeline connection tooling to facilitate subsequent sampling and testing;

[0033] 15) Install a vibrator on the flushing pipeline, pay attention to keep the vibrator working normally, and use a wooden hammer to intermittently knock on the connection between the main pipe and the branch pipe;

[0034] 16) Before flushing, preheat the lubricating oil below 25℃ to 25℃. After 4 hours of circulating and flushing, slowly heat the lubricating oil to 60-65℃. Maintain the pressure after the lubricating oil pump at >1.5bar, ensure the normal operation of the lubricating oil separator, and turn on the vibrator.

[0035] 17) After flushing the lubricating oil pipeline for 24 hours, extract the lubricating oil sample from the flushing inspection bucket and pipeline connection tooling, and conduct particle size analysis;

[0036] 18) Install the inspection bag in the flushing inspection bucket, and then continue flushing for 2 hours before stopping the oil flushing. Open the flushing inspection bucket and visually inspect the bag status. If there are no visible hard particles in the inspection bag, the flushing requirements have been met.

[0037] 19) If the state inside the inspection bag does not meet the flushing requirements, the inspection bag is replaced and flushing is continued for 2 hours, and then the new inspection bag is retested until the state inside the inspection bag meets the flushing requirements;

[0038] 20) After the oiling is completed, remove the pipeline connection tools and oiling hoses, and reinstall the main engine lubricating oil piping system;

[0039] 21) Remove the installed blind plate.

[0040] Furthermore, in the steps A5) and B15), the hammering is performed for 10 to 15 minutes every 2 hours.

[0041] Furthermore, the flushing hose comprises a rubber oil pipe and metal flanges or internal threaded joints at both ends thereof; the inner tube of the rubber oil pipe is smooth and free of impurities, and the outer wall reinforcement layer is a high-strength synthetic core and spiral copper wire.

[0042] Furthermore, the working temperature of the flushing hose is -30°C to +100°C, and the working pressure is 10 bar.

[0043] Furthermore, the outer wall reinforcement layer of the rubber oil pipeline is anti-static, oil-resistant, corrosion-resistant, weather-resistant and wear-resistant.

[0044] Furthermore, the specifications of the metal flange and the internal threaded joint of the flushing hose are determined according to needs.

[0045] Furthermore, the pipeline connection tooling is formed by welding a steel pipe, a flange and a pipe joint, and has multiple interfaces.

[0046] Furthermore, the flushing and inspection barrel includes a barrel body, an upper cover, an inlet, an outlet and an inspection bag, the upper cover is connected to the upper end of the barrel body, the inlet and the outlet are respectively arranged at the upper and lower parts of the barrel body, and the inspection bag is arranged inside the barrel body and divides the inner cavity of the flushing and inspection barrel into an upper and lower part that can pass lubricating oil.

[0047] Furthermore, the specification of the inspection bag is 50 μm.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] 1) It meets the need to flush the inside of the main engine pipeline before low-speed diesel engine oil commissioning.

[0050] 2) The flushing method is efficient and convenient. The fuel pipeline and the lubricating oil pipeline are connected separately and flushed uniformly, achieving a high efficiency and labor-saving effect.

[0051] 3) The flushing method improves the cleanliness of the oil pipe pipeline of the low-speed diesel engine main engine, and avoids the occurrence of damage to the main engine parts caused by residual particulate impurities in the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is the layout diagram of the flushing device for the fuel line.

[0053] Figure 2 It is the schematic diagram of the fuel line flushing method.

[0054] Figure 3This is the layout diagram of the flushing device for the lubricating oil pipeline.

[0055] Figure 4 It is the schematic diagram of the lubricating oil pipeline flushing method.

[0056] Figure 5 is a schematic diagram of the flushing hose.

[0057] Figure 6 It is a schematic diagram of the pipeline connection tooling.

[0058] Figure 7 is a schematic diagram of a flush inspection barrel. DETAILED DESCRIPTION

[0059] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, but the scope of protection of the present invention shall not be limited thereby.

[0060] The invention is used for flushing fuel pipelines and lubricating oil pipelines of low-speed diesel engines, and is particularly suitable for flushing various oil pipelines of WinGD X92 engines, achieving an effective and reliable flushing effect.

[0061] Example

[0062] Please see Figure 1 and Figure 2 , Figure 1 This is a layout diagram of the fuel pipe flushing device of the present invention. Figure 2 It is the schematic diagram of the fuel line flushing method.

[0063] The fuel line flushing method includes the following steps:

[0064] 1. Cut off the fuel inlet and return pipes connected to the fuel pump and use Figure 5 The flushing hose shown connects the fuel inlet and return branches to ensure that fuel does not enter the fuel pump during the flushing phase.

[0065] 2. Connect the main engine fuel external interface, including the fuel inlet main pipe and the fuel return main pipe, and install a flushing inspection barrel on the fuel return main pipe.

[0066] 3. Turn on the auxiliary system booster pump to maintain the pressure on the fuel main at 3-4 bar;

[0067] 4. Installing a vibrator on the flushing pipeline can quickly shake off the granular impurities in the flushing pipeline and flush them away with the oil pipeline, thereby shortening the flushing time and improving the flushing quality.

[0068] 5. During the flushing process, pay attention to keep the vibrator working normally, and use a wooden hammer to knock at irregular intervals at the branch pipes of the main pipe. The basic requirement is to knock for 10 to 15 minutes every 2 hours.

[0069] 6. After the flushing time reaches 4 hours, stop the oil and install a 50μm inspection bag in the flushing inspection bucket. Then continue flushing for 2 hours, then stop the oil, open the flushing inspection bucket to check the inspection bag status, and there should be no visible hard particles in the inspection bag.

[0070] 7. If the inspection bag does not meet the requirements, replace the inspection bag, continue flushing for 2 hours, and then re-inspect the inspection bag until the inspection bag meets the requirements.

[0071] 8. After flushing, remove the flushing hose and reinstall the main engine fuel inlet and return branches.

[0072] 9. Remove the flushing inspection barrel and reinstall the fuel external interface pipeline.

[0073] Please see Figure 3 and Figure 4 , Figure 3 This is a layout diagram of the lubricating oil pipe flushing device of the present invention. Figure 4 It is the schematic diagram of the lubricating oil pipeline flushing method.

[0074] The flushing method of the lubricating oil pipeline includes the following steps:

[0075] 1. Install flushing seal plate and pipeline connection tooling. Install blind flange on the main bearing oil inlet flange to bypass the main bearing lubricating oil.

[0076] 2. Insert the sealing plate on the free end cover of the axial shock absorber oil pipe to blind it.

[0077] 3. Disconnect the connection between the oil inlet rocker arm and the crosshead, place the oil inlet rocker arm vertically downward and install a filter to prevent the lubricating oil from splashing, then use wire to fix the oil inlet rocker arm to the frame to prevent impurities from accumulating in the oil circuit.

[0078] 4. Remove the flange cover at the end of the crosshead oil main pipe, connect the flushing inspection bucket, and then return it to the oil pan or oil return pipe.

[0079] 5. Disconnect the connection between the lubricating oil inlet pipe and the supercharger, and blind the cylinder oil branch pipe in the common rail with a blind plate.

[0080] 6. Use a flushing hose to connect the 1# supercharger oil inlet pipe to the cylinder oil inlet pipe, and use a flushing hose to connect the other end of the cylinder oil inlet pipe to the 3# supercharger oil return pipe.

[0081] 7. Use a flushing hose to connect the 3# supercharger oil inlet pipe to the other cylinder oil inlet pipe, and use a flushing hose to connect the other end of the cylinder oil inlet pipe to the 1# supercharger oil return pipe.

[0082] 8. Use a flushing hose to connect the 2# supercharger oil inlet pipe to the 2# supercharger oil return pipe.

[0083] 9. Disconnect the thrust bearing oil inlet branch flange and install the bypass plate.

[0084] 10. Disconnect the gearbox oil inlet branch pipe, the fuel pump lubricating oil inlet main pipe, and the oil pump oil inlet branch pipe.

[0085] 11. Use a flushing hose to connect the gearbox oil inlet branch pipe to the fuel pump oil inlet main pipe.

[0086] 12. Use a flushing hose to connect the fuel pump oil inlet main pipe, the oil pump oil inlet branch pipe and the pipeline connection tooling;

[0087] 13. The lubricating oil is connected to the return oil main of the auxiliary machine system through a pipeline;

[0088] 14. Install a sampling valve on the pipeline connection tooling to facilitate subsequent sampling and testing.

[0089] 15. Install a vibrator on the flushing pipeline, pay attention to keep the vibrator working normally, and use a wooden hammer to knock at irregular intervals at the branch pipes of the main pipe. The basic requirement is to knock for 10 to 15 minutes every 2 hours.

[0090] 16. Before starting flushing, preheat the lubricating oil with a temperature below 25°C to 25°C. After the lubricating oil is circulated and flushed for 4 hours, slowly heat the lubricating oil to 60-65°C. Maintain the pressure behind the lubricating oil pump at >1.5bar to ensure the normal operation of the lubricating oil separator and turn on the vibrator.

[0091] 17. After flushing the main engine lubricating oil pipeline for 24 hours, extract the lubricating oil sample from the flushing inspection barrel and pipeline connection tooling, and conduct particle size analysis.

[0092] 18. Install a 50μm inspection bag in the flushing inspection bucket. Then continue flushing for 2 hours, then stop the oil, open the flushing inspection bucket to check the inspection bag status, and there should be no visible hard particles in the inspection bag.

[0093] 19. If the inspection bag does not meet the requirements, replace the inspection bag, continue flushing for 2 hours, and then re-inspect the inspection bag until the inspection bag meets the requirements.

[0094] 20. After the oiling is completed, remove the pipeline connection tools and oiling hoses, and reinstall the main engine lubricating oil piping system. The reinstalled piping system includes: gear box lubrication piping system, lubricating oil pump piping system, fuel pump lubricating oil piping system, supercharger lubricating oil piping system and cylinder lubricating oil piping system, etc.

[0095] 21. Remove the oil filling blind plate installed during oil filling.

[0096] See also Figure 5The flushing hose can be connected in series with pipe joints or flanges of different lengths and specifications according to different needs. The flushing hose is made of a metal flange or an internal threaded joint plus a rubber oil pipe. The inner tube of the rubber oil pipe is required to be smooth and free of impurities. The reinforcement layer is a high-strength synthetic core and spiral copper wire, which can resist static electricity. The outer layer is required to be oil-resistant, corrosion-resistant, weather-resistant, and wear-resistant. The working temperature of the rubber hose is -30℃~+100℃, and the working pressure is 10bar;

[0097] See also Figure 6 The pipeline connecting tool is installed between each flushing hose and is used to bring the pipelines together. The pipeline connecting tool is welded by adding a steel pipe to a flange or a pipe joint.

[0098] Use flushing hoses and pipeline connection tools to connect the fuel pipe system and lubricating oil pipe system on the main engine respectively.

[0099] Select appropriate filter according to actual needs to remove impurities in the flushing oil.

[0100] Select a suitable vibrator according to actual needs and install it at a reasonable position on the pipeline to increase the speed at which particulate impurities are flushed, thereby shortening the flushing time and improving the flushing quality.

[0101] See also Figure 7 The flushing inspection barrel comprises a barrel body 1, an upper cover 2, an inlet 3, an outlet 4 and an inspection bag 5. The upper cover 2 is connected to the upper end of the barrel body 1, the inlet 3 and the outlet 4 are respectively arranged at the upper and lower parts of the barrel body 1, and the inspection bag 5 is arranged inside the barrel body 1 and divides the inner cavity of the flushing inspection barrel into two upper and lower parts that can pass the lubricating oil.

[0102] Use a flushing inspection barrel, in which a 50 μm inspection bag 5 is installed, to check the flushing effect. The flushing inspection barrel is installed between the oil return line and the oil tank.

[0103] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. All equivalent changes and modifications made according to the content of the present invention should be within the technical scope of the present invention.

Claims

1. A method for flushing fuel and lubricating oil pipelines of a low-speed diesel engine, characterized in that: The flushing method includes: A. The method of flushing the fuel line includes the following steps: 1) Cut off the connection between each fuel inlet branch pipe and fuel return branch pipe and the fuel pump, and use a flushing hose and a pipeline connection tool to connect the fuel inlet branch pipe and the fuel return branch pipe to form a flushing pipeline to ensure that the fuel does not enter the fuel pump during the flushing stage; 2) Connecting the main engine fuel external interface with the flushing pipeline through the fuel inlet main pipe and the fuel return main pipe, and installing a flushing inspection bucket on the fuel return main pipe; 3) Turn on the boost pump to maintain the pressure on the fuel inlet manifold at 3-4 bar; 4) Installing a vibrator on the flushing pipeline to quickly shake off the granular impurities in the flushing pipeline and flush them away with the oil flow, thereby shortening the flushing time and improving the flushing quality, and maintaining the normal operation of the vibrator during the flushing process; 5) Use a wooden hammer to intermittently strike the connection between each fuel inlet branch pipe and the fuel return branch pipe and the fuel return main pipe; 6) After four hours, the flushing is stopped, and an inspection bag is installed in the flushing inspection barrel. After that, the flushing is continued for 2 hours, and then the oil is stopped for flushing. The inspection barrel is opened and the inspection bag is visually inspected. If there are no visible hard particles in the inspection bag, the flushing requirements are met; 7) If the state inside the inspection bag does not meet the flushing requirements, the inspection bag is replaced and flushing is continued for 2 hours, and then the new inspection bag is retested until the state inside the inspection bag meets the flushing requirements; 8) After flushing is completed, remove the flushing hose and reinstall the fuel inlet branch pipe and fuel return branch pipe of the main engine; 9) Remove the flushing inspection barrel and reinstall the main engine fuel external interface pipeline; B. The flushing method of the lubricating oil pipeline includes the following steps: 1) Install the flushing seal plate and pipeline connection tooling, install a blind plate on the main bearing oil inlet flange, and bypass the main bearing lubricating oil; 2) Insert a sealing plate at the free end of the axial shock absorber oil pipe to seal it; 3) Disconnect the connection between the oil inlet rocker arm and the crosshead, place the oil inlet rocker arm vertically downward and install a filter to prevent the oil from splashing, then fix the oil inlet rocker arm to the frame with wire to prevent impurities from accumulating in the oil circuit; 4) Remove the flange cover at the end of the crosshead oil main pipe, connect the flushing inspection bucket, and then return it to the oil pan or the oil return pipe; 5) Disconnect the oil inlet pipe from the supercharger, and seal the cylinder oil branch pipe in the common rail with a blind plate; 6) Use a flushing hose to connect the 1# supercharger oil inlet pipe to the cylinder oil inlet pipe, and use a flushing hose to connect the other end of the cylinder oil inlet pipe to the 3# supercharger oil return pipe; 7) Use a flushing hose to connect the 3# supercharger oil inlet pipe to another cylinder oil inlet pipe, and the other end of the cylinder oil inlet pipe is connected to the 1# supercharger oil return pipe with a flushing hose; 8) Use a flushing hose to connect the 2# supercharger oil inlet pipe to the 2# supercharger oil return pipe; 9) Disconnect the thrust bearing oil inlet branch pipe flange and install the bypass plate; 10) Disconnect the gearbox oil inlet branch pipe, the fuel pump lubricating oil inlet main pipe and the oil pump oil inlet branch pipe; 11) Use a flushing hose to connect the gearbox oil inlet branch pipe to the fuel pump oil inlet main pipe; 12) Use the flushing hose and pipeline connection tool to connect the fuel pump oil inlet main pipe to the oil pump oil inlet branch pipe; 13) The lubricating oil is connected to the return oil main of the auxiliary machine system through a pipeline; 14) Install a sampling valve on the pipeline connection tooling to facilitate subsequent sampling and testing; 15) Install a vibrator on the flushing pipeline, pay attention to keep the vibrator working normally, and use a wooden hammer to intermittently knock on the connection between the main pipe and the branch pipe; 16) Before flushing, preheat the lubricating oil below 25℃ to 25℃. After 4 hours of circulating and flushing, slowly heat the lubricating oil to 60-65℃. Maintain the pressure after the lubricating oil pump at >1.5bar, ensure the normal operation of the lubricating oil separator, and turn on the vibrator. 17) After flushing the lubricating oil pipeline for 24 hours, extract the lubricating oil sample from the flushing inspection bucket and pipeline connection tooling, and conduct particle size analysis; 18) Install the inspection bag in the flushing inspection bucket, and then continue flushing for 2 hours before stopping the oil flushing. Open the flushing inspection bucket and visually inspect the bag status. If there are no visible hard particles in the inspection bag, the flushing requirements have been met. 19) If the state inside the inspection bag does not meet the flushing requirements, the inspection bag is replaced and flushing is continued for 2 hours, and then the new inspection bag is retested until the state inside the inspection bag meets the flushing requirements; 20) After the oiling is completed, remove the pipeline connection tools and oiling hoses, and reinstall the main engine lubricating oil piping system; 21) Remove the installed blind plate.

2. The flushing method for the fuel pipeline and lubricating oil pipeline of a low-speed diesel engine according to claim 1, characterized in that: In the steps A5) and B15), the hammering is performed for 10 to 15 minutes every 2 hours.

3. The flushing method for the fuel pipeline and lubricating oil pipeline of a low-speed diesel engine according to claim 1, characterized in that: The flushing hose comprises a rubber oil delivery pipe and metal flanges or internal threaded joints at both ends thereof; the inner pipe of the rubber oil delivery pipe is smooth and free of impurities, and the outer wall reinforcement layer is a high-strength synthetic core and spiral copper wire.

4. The flushing method for the fuel pipeline and lubricating oil pipeline of a low-speed diesel engine according to claim 3, characterized in that: The working temperature of the flushing hose is -30°C to +100°C, and the working pressure is 10 bar.

5. The flushing method for the fuel pipeline and lubricating oil pipeline of a low-speed diesel engine according to claim 3, characterized in that: The outer wall reinforcement layer of the rubber oil pipeline is anti-static, oil-resistant, corrosion-resistant, weather-resistant and wear-resistant.

6. The flushing method for the fuel pipeline and lubricating oil pipeline of a low-speed diesel engine according to claim 3, characterized in that: The specifications of the metal flange and the internal threaded joint of the flushing hose are determined according to needs.

7. The flushing method for the fuel pipeline and lubricating oil pipeline of a low-speed diesel engine according to claim 1, characterized in that: The pipeline connection tooling is welded by steel pipes, flanges and pipe joints and has multiple interfaces.

8. The flushing method for the fuel pipeline and lubricating oil pipeline of a low-speed diesel engine according to claim 1, characterized in that: The flushing and inspection barrel includes a barrel body, an upper cover, an inlet, an outlet and an inspection bag. The upper cover is connected to the upper end of the barrel body, the inlet and the outlet are respectively arranged at the upper and lower parts of the barrel body, and the inspection bag is arranged inside the barrel body and divides the inner cavity of the flushing and inspection barrel into an upper and lower part that can pass lubricating oil.

9. The flushing method for the fuel pipeline and lubricating oil pipeline of a low-speed diesel engine according to claim 8, characterized in that: The specification of the inspection bag is 50 μm.

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