How to determine if a safety valve is leaking internally?
Thread Content
I mainly want to know how to determine whether a safety valve is experiencing internal leakage for both external and internal tests, especially in the case of fully enclosed safety valves.
This post was last edited by ylb913 on 2016-12-7 21:24. I’m not sure what medium you’re using? A good way to tell if liquefied gas is problematic is that it will cool down, or even frost over, in the event of an internal leak. There is another method: the devices at the outlet of our low-pressure gas pipeline system have pressure displays, and this also works for dry gas. We also have safety valves for liquids; we monitor the liquid level changes in the tank behind.
The medium is a liquid; in normal oil refining plants, it refers to steam, coal, diesel, etc； Can we analyze it using a common distillation column? The temperature is generally around 100°C, I guess
Then feel or measure the temperature of the pipeline behind the safety valve.
Is the temperature 100°C? Place a small piece of a solid similar to paraffin (with a melting point below 100°C) on the safety valve; by checking the state of this paraffin, it can be determined whether there is a leak in the valve – if it has melted, that indicates a leak.
This mainly relies on experience: 1. Check the temperature difference between the inlet and outlet. 2. Listen for any sound of fluid flow.
Based on the properties of the medium. Listen to pipe noises and so on
Depending on the work situation, experience also plays a role. The types of safety valves also vary. We often make judgments based on the temperature behind the valve. Judging pressure also relies on experience