Pipeline purging

According to standards and standard practices, valves such as control valves, safety valves, and throttle valves are generally not suitable for use in pipeline purging, as their design and structure are not intended to withstand the high-speed airflow or particle impacts that may occur during purging, making them prone to damage. Stop valves can usually be used for purging, as they are primarily designed to fully open or close fluid flow, have a simple structure, and can withstand high pressures. The main function of a steam trap is to remove condensate from the steam system; since its operation relies on sensitive responses to temperature and pressure, it is generally not recommended for use in purging processes, as this could affect its performance or damage the valve. When participating in pipeline purging, ensure that valves suitable for the task are used, and that the relevant valves and equipment can withstand the conditions during the purging process. If you have any questions or need clear guidance, it is best to consult the manufacturer of the relevant equipment or follow industry standards and safety protocols. .

Blowing is the process of using a high-speed fluid to impact the pipe walls in order to remove mechanical impurities from them. These impurities can damage the sealing of valve openings; in cases of check valves or orifice plates with dead corners, they cause the accumulation of mechanical impurities, posing risks to safe operation in the future. Therefore, in any areas where dead corners exist or where the valve openings are prone to damage from impacts, it is necessary to remove those parts for sectional purging, or to take other measures for purging. Some rules and regulations stem from production practices; therefore, it is best to formulate measures based on the needs on site. For reference.

It depends on the actual situation; if purging might affect devices such as valves and flow meters, they can be removed and replaced with pipe sections. Devices that cannot be replaced need to be isolated, but care must be taken to ensure they can be cleaned thoroughly. Avoid disrupting the progress of the next process.

Except for the first valve on the main pipeline, none of the other valves on it (including safety valves and control valves) are involved in the purging process. The safety valves on the pipeline will not activate due to low pressure during purging, and since the pipeline is short, purging is not necessary. During the steam pipeline purging process, it is necessary to enhance water drainage in order to prevent water impact accidents; therefore, steam traps must be used. Water drainage can be categorized into operational drainage (with steam traps), start-up drainage, and free drainage. The drainage that occurs during pipeline purging falls under start-up drainage – at this time, the steam trap operates in bypass mode, while the valves before and after the steam trap are closed. Since the diameter of the drainage pipe is small, it is easy to perform maintenance on the steam trap after the pipeline purging is complete

I didn’t quite understand it, boss. 1. The controller is used only to control steam at the first valve; the subsequent valves are replaced with short pipes. 2. The safety valve does not participate in the purging process; since the pressure is not high, it does not activate. Moreover, its piping is short, so there is no need for purging, and therefore it does not need to be removed. 3. What about the branch pipes? How to operate it? 4. Does the steam trap participate in purging? How do I operate this button? Especially since the pipes are cold at first, how can one determine the condition of the condensate water? If a steam trap is used in the purging process, could it cause damage to the seal surface of the steam trap? 5. Finally, what does the sentence “The drain valve can be easily ground and maintained” mean? This is how I understand it; please give me some guidance, sir

Due to the presence of welding slag, soil, or other debris during installation and construction, the pipes need to be thoroughly cleaned and flushed after installation. Valves and other accessories are clean when they leave the factory; if purging is carried out, small weld slag or stones hitting these valves and other accessories can easily cause damage.