1. Preparation before cleaning First, conduct a thorough investigation of the pipeline that needs cleaning. Find and prepare the necessary drawings and archives data, combine the on-site investigation to find out the direction of the pipeline, the diameter of the pipeline, the starting and ending point of the sweep, the environment around the pipeline, whether there is a turning point, and what auxiliary facilities such as pumping tanks and discharge pipes are along the line. In addition, other original conditions must be ascertained, such as the date when the pipeline is completed and put into operation, the material and interface of the pipeline, the operating pressure of the pipeline, and the type of medium to be transported in the pipeline. If there are conditions, an occlusion analyzer should be used to detect the blockage of the pipeline to determine the degree of blockage of the pipeline.
The main purpose of doing so is to determine an optimal construction plan through investigation, such as determining the ideal excavation site, careful gas stoppage, pressure reduction, and dispersion measures.
Secondly, it is necessary to perform simulated cleaning experiments and air tightness tests on the pipeline before cleaning. The main purpose of this is to determine whether the high-pressure water jet damages the pipe interface under working pressure in order to determine a reasonable cleaning pressure. The specific method is to prepare several sections of pipe, connect it according to the actual pipe interface requirements, and test pressure to determine whether the pipe interface is reliably sealed. 300-400kg/cm2 pressure is generally selected for simulated cleaning and destructive testing at the interface. After the experiment, conduct air tightness test on the pipeline to determine if there is any damage to the interface.
In addition, other preparations should be done before cleaning. If the pressure is above 2kg/cm2, please prepare the water source near the cleaning device (fire water). If there is no water source, it can be transported by fire fighting water tankers and equipped with fire-fighting water pipes for water transportation; on-site lighting facilities should be available; at the same time, there should be two vacuum suction vehicles (one open and one spare) and they must be used throughout the day.
2. The main work flow of high-pressure water jet cleaning After doing the above preparations, you can clean the pipeline. The following steps can be performed when cleaning:
(1) Excavate above all condensation tanks in the purge line and open the condensate cylinder cover. If there is no condensate tank or other special conditions, it can also be controlled in other parts of the pipeline and cut off the pipeline. The length of the resection pipe should be suitable for easy cleaning operation. Generally about 200mm;
(2) The distance between work pits is generally 200m, and the size of the operation pit open control can generally facilitate 3-4 operations;
(3) Install the nozzle at the condensate tank, turn on the water source and start the device, the pressure is adjusted below 500kg/cm2, use a foot valve to control the nozzle to clean, and the reverse jet will clean most of the washed dirt to the coagulation. At the tank or fracture. When the spray head is moved to a predetermined position (approximately 80-100m), the high pressure tube is manually pulled out in the opposite direction of the running direction with the spray head, and the flushed dirt is removed by the reverse jet. This process may be repeated several times until all dirt is removed;
(4) At the same time as the cleaning operation, start the vacuum suction car and pump out the accumulated dirt and water mixture in the condensate tank;
(5) After completing a period of cleaning, place the nozzle on the pipe port in the other direction of the condensate tank and repeat steps (3) and (4);
(6) Move the high pressure cleaning device and other supporting facilities to the next condensing water tank, and repeat (3), (4), (5);
(7) Restore the condensate tank and pipe interface to the original state.
After the cleaning, airtightness tests must be performed on the entire pipeline to observe the damage of the high-pressure water jet to the interface and find problems in time.
According to the actual situation at the scene, visual observation of the cleaning effect is generally used. It is not easy to be visually checked, and several places are selected and tested with an occlusion device. The scale removal rate of the cleaning pipeline should not be less than 90%.
1. Oil gas plant cleaning to low-pressure gas pipelines in January 24th Middle School. The pipe is a cast iron pipe with a Dg700mm cement interface, and it has a total length of nearly 2km. Inside the pipe is a mixture of natural gas and oil gas. Completed and put into use in 1965. The detection rate of fouling in the tube is between 24-76%. The average fouling rate reached 33.4%, and a large amount of fouling increased the pipeline transportation pressure load, resulting in a poor operating condition of the pipeline.
A high pressure water jet with a pressure of 400kg/cm2 was used to clean the section of pipeline. It took ten days and invested more than 200,000 yuan to remove the fouling in the pipe. The scale removal rate reached over 90%. The results of the air tightness test showed no damage to the interface, which improved the operational status of the pipeline.
2. Middle-pressure gas pipeline cleaning from Coking Gas Plant to Weigong Street In October 2004, the pipe section was cleaned using high pressure water jet cleaning technology. The pipe diameter of the pipe is Dg250mm, and the pipe conveying medium is coking gas. The running time is more than twenty years. The test results show that the pipe plugging is very serious, and the blocking rate in individual places reaches more than 80%. Seriously affected the gas supply situation in the area.
The use of high-pressure water jet cleaning technology after section cleaning, completely remove the fouling in the pipe, thereby greatly improving the pipeline's conveying capacity.
V. Conclusion Through the above discussion, especially the multiple cleaning examples, it proves that the pressure washer can be completely applied to the maintenance and cleaning of gas pipelines. The pipeline cleaned with this technology is basically clean and will not cause any damage or damage to the pipeline. It is the ideal technology for maintenance and cleaning of gas pipelines.
The main purpose of doing so is to determine an optimal construction plan through investigation, such as determining the ideal excavation site, careful gas stoppage, pressure reduction, and dispersion measures.
Secondly, it is necessary to perform simulated cleaning experiments and air tightness tests on the pipeline before cleaning. The main purpose of this is to determine whether the high-pressure water jet damages the pipe interface under working pressure in order to determine a reasonable cleaning pressure. The specific method is to prepare several sections of pipe, connect it according to the actual pipe interface requirements, and test pressure to determine whether the pipe interface is reliably sealed. 300-400kg/cm2 pressure is generally selected for simulated cleaning and destructive testing at the interface. After the experiment, conduct air tightness test on the pipeline to determine if there is any damage to the interface.
In addition, other preparations should be done before cleaning. If the pressure is above 2kg/cm2, please prepare the water source near the cleaning device (fire water). If there is no water source, it can be transported by fire fighting water tankers and equipped with fire-fighting water pipes for water transportation; on-site lighting facilities should be available; at the same time, there should be two vacuum suction vehicles (one open and one spare) and they must be used throughout the day.
2. The main work flow of high-pressure water jet cleaning After doing the above preparations, you can clean the pipeline. The following steps can be performed when cleaning:
(1) Excavate above all condensation tanks in the purge line and open the condensate cylinder cover. If there is no condensate tank or other special conditions, it can also be controlled in other parts of the pipeline and cut off the pipeline. The length of the resection pipe should be suitable for easy cleaning operation. Generally about 200mm;
(2) The distance between work pits is generally 200m, and the size of the operation pit open control can generally facilitate 3-4 operations;
(3) Install the nozzle at the condensate tank, turn on the water source and start the device, the pressure is adjusted below 500kg/cm2, use a foot valve to control the nozzle to clean, and the reverse jet will clean most of the washed dirt to the coagulation. At the tank or fracture. When the spray head is moved to a predetermined position (approximately 80-100m), the high pressure tube is manually pulled out in the opposite direction of the running direction with the spray head, and the flushed dirt is removed by the reverse jet. This process may be repeated several times until all dirt is removed;
(4) At the same time as the cleaning operation, start the vacuum suction car and pump out the accumulated dirt and water mixture in the condensate tank;
(5) After completing a period of cleaning, place the nozzle on the pipe port in the other direction of the condensate tank and repeat steps (3) and (4);
(6) Move the high pressure cleaning device and other supporting facilities to the next condensing water tank, and repeat (3), (4), (5);
(7) Restore the condensate tank and pipe interface to the original state.
After the cleaning, airtightness tests must be performed on the entire pipeline to observe the damage of the high-pressure water jet to the interface and find problems in time.
According to the actual situation at the scene, visual observation of the cleaning effect is generally used. It is not easy to be visually checked, and several places are selected and tested with an occlusion device. The scale removal rate of the cleaning pipeline should not be less than 90%.
1. Oil gas plant cleaning to low-pressure gas pipelines in January 24th Middle School. The pipe is a cast iron pipe with a Dg700mm cement interface, and it has a total length of nearly 2km. Inside the pipe is a mixture of natural gas and oil gas. Completed and put into use in 1965. The detection rate of fouling in the tube is between 24-76%. The average fouling rate reached 33.4%, and a large amount of fouling increased the pipeline transportation pressure load, resulting in a poor operating condition of the pipeline.
A high pressure water jet with a pressure of 400kg/cm2 was used to clean the section of pipeline. It took ten days and invested more than 200,000 yuan to remove the fouling in the pipe. The scale removal rate reached over 90%. The results of the air tightness test showed no damage to the interface, which improved the operational status of the pipeline.
2. Middle-pressure gas pipeline cleaning from Coking Gas Plant to Weigong Street In October 2004, the pipe section was cleaned using high pressure water jet cleaning technology. The pipe diameter of the pipe is Dg250mm, and the pipe conveying medium is coking gas. The running time is more than twenty years. The test results show that the pipe plugging is very serious, and the blocking rate in individual places reaches more than 80%. Seriously affected the gas supply situation in the area.
The use of high-pressure water jet cleaning technology after section cleaning, completely remove the fouling in the pipe, thereby greatly improving the pipeline's conveying capacity.
V. Conclusion Through the above discussion, especially the multiple cleaning examples, it proves that the pressure washer can be completely applied to the maintenance and cleaning of gas pipelines. The pipeline cleaned with this technology is basically clean and will not cause any damage or damage to the pipeline. It is the ideal technology for maintenance and cleaning of gas pipelines.
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