What kind of purge is used before using gas pipes?

Before the gas pipeline is used, steam and nitrogen are used as the replacement medium to purge it.

Steam purging. 1.Steam purging is suitable for transporting power steam pipelines or thermal pipelines, and non-thermal pipelines are not suitable for steam purging because they are not designed to consider thermal expansion and other problems.

2.Steam purging should be carried out with a large flow of steam, and the flow rate should not be less than 30ms.

3.Before steam purging, the pipe should be warmed, and the water should be drained in time to check the thermal displacement of the pipeline.

4.Steam purging should be carried out according to the steam - slowly warming the tube - constant temperature for 1h - purging - stopping the gas to cool down - then heating the pipe to heat up, constant temperature, and the second purging, so repeated generally not less than 3 times.

5.Medium and high pressure steam pipelines and steam turbine inlet pipelines should be inspected with flat and smooth aluminum target plates and wooden target plates for low-pressure steam, and the target plates should be placed at the steam outlet, and the target plates should be qualified if there is no dirt.

Requirements for purge replacement of gas equipment or pipelines:

1. Purge and replace the gas inside the gas facility, and use steam and nitrogen as the replacement medium. During the purging process, it is strictly forbidden to tie the welding wire on the gas facility, and the fire source is strictly prohibited within 40 meters around the gas facility.

2. Whether the replacement of the gas facility meets the predetermined requirements shall be determined according to the oxygen content and carbon monoxide analysis or ** test.

3. The sequence of gas replacement: close the water seal or gate valve at both ends of each section - open all the square valves on the pipeline - turn on the steam (or nitrogen) for purging - take samples and test to know that the oxygen content is less than 2% - open the pipeline valve and replace the steam or nitrogen with gas (if it is gas for gas supply) (if it is steam, the steam should be closed after opening the valve) - release the pipe at the end of the pipeline - take samples for combustion test until it is qualified.

Summary. Kiss! Gas Pipeline Purging Requirements:

1. Flow rate: should not be less than 20m s; 2. Maximum pressure: shall not be greater than the design pressure of the pipeline; 3. Purging port setting:

It should be located in an open area, the angle between the purge port and the ground should be between 30 ° and 50 °, the diameter of the purge port is 4, and the purge pipeline should not exceed 500m, and when the length of the pipeline exceeds 500m, it should be purged in sections; When the length of the pipeline is not more than 200m, the pipeline itself can be purged by means of gas storage and release, and the purging sequence should be from the large pipe to the small pipe, from the main pipe to the branch pipe; 5. Gas equipment: The gas equipment in the purge pipe section shall not participate in the purging; 6. Inspection method:

At the exhaust port of the purge pipeline, there is a white cloth or a target plate coated with white paint for inspection, and there is no rust, mud, or other dirt on the target plate within 5 minutes.

Kiss! Please wait a while and Little Lemon will check it for you!

Kiss the town! The purging of gas pipelines shall meet the following requirements: (1) The length of each purge pipeline shall not exceed 500m; When the length of the pipeline exceeds 500m, it is advisable to purge in sections.

2. When there is no smoke and dust in the exhaust air visually, a white cloth or a white lacquered wooden target plate should be set up at the exhaust port for inspection, and there is no rust, dust and other miscellaneous keys on the target within 5min to be qualified.

Kiss! Gas pipeline purging requirements: 1. Flow rate:

It should not be less than 20ms; 2. Maximum pressure: shall not be greater than the design pressure of the pipeline; 3. Purging port setting: should be located in an open area, the angle between the purge port and the ground should be between 30 ° and 50 °, the diameter of the purge port is 4, and the purge pipe:

The length should not exceed 500m, and when the length of the pipeline exceeds 500m, it should be purged in sections; When the length of the pipe socks is not more than 200m, the pipeline itself can be purged by means of gas storage and release, and the purging sequence should be from the large pipe to the small pipe, from the main pipe to the branch pipe; 5. Gas equipment: The gas equipment in the purge pipe section shall not participate in the purging; 6. Inspection method: In the exhaust port of the blowing pipeline, there is a white cloth or a target plate coated with white paint for inspection, and there is no rust, mud, or other dirt on the target plate within 5min.

Before the gas pipeline is used, steam and nitrogen are used as the replacement medium to purge it. Steam purging 1Steam purging is suitable for transporting power steam pipelines or thermal pipelines, and non-thermal pipelines are not suitable for steam purging because they do not consider the problems of thermal expansion when designing the steam pipeline.

2.Steam purging should be purged with a large flow of steam, and the flow rate should not be less than 30m. The pipe should be warmed before steam purging, and the water should be drained in time to check the thermal displacement of the pipeline. 4.

Steam purging should be pressed according to the steam - slowly warming the tube - constant temperature for 1h - purging - stopping the gas to cool down - then heating the pipe to raise the temperature, constant temperature, the second purging, and so on not less than 3 times. 5.Medium and high pressure steam pipelines and steam turbine inlet pipelines should be inspected with flat and smooth aluminum target plate and wooden target plate for low pressure steam, and the target plate should be placed at the steam outlet, and the target plate should be qualified if there is no dirt.

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Gas Pipeline Sweeping Steps Potato Stupid? : The gas pipeline purging process is the last process operation requirement before being put into use after the gas pipeline strength pass test is qualified. Purging using air as the purging source, the purge pipe silver hand empty channel is connected to the gas storage tank with a valve, and then directly sent by the gas storage tank to the pipeline to purge (generally not less than the air pressure of megapascals) The final end of the purge pipeline is equipped with a target plate inspection, and finally after several times of purging, there is no metal slag or other foreign matter on the target plate is qualified, and after passing the qualification, the megapascal nitrogen gas is closed to be used blindly.

Hello dear, I'm glad to answer for you. The purpose of gas pipeline purging is to clean up the debris and dirt inside the pipe and ensure that the pipe is unblocked. Generally speaking, nitrogen and air can be used for gas pipe purging, but the following points need to be noted:

1.Mixing ratio of nitrogen and air mold gas: The mixing ratio of nitrogen and air should be controlled within an appropriate range to avoid pressure changes in the pipeline caused by too high or too low mixing ratio.

2.Nitrogen and air purity: The purity of nitrogen and air also needs to be ensured.

The use of impure nitrogen or air can affect the purging effect and may even damage the pipeline. 3.Security Issues:

When using nitrogen and air for purging, operator safety needs to be guaranteed. Due to the use of nitrogen, there may be a danger of hypoxia and appropriate safety measures need to be taken.

Use high-pressure air to purge pipes of dirt, rust, etc.

Industrial purging is divided into pressure levels, and ultra-high pipelines can generally only be seen in large chemical plants The purging time is generally half a month Excessive noise The purging medium is steam; There are fewer days of medium and low pressure.

The principle is to use the high-pressure steam of the thermal power plant to quickly remove the debris in the pipeline installation process, so that the pipeline can be kept clean and meet the process requirements.