Nitrogen Preservation on Pig Receiver
Nitrogen Preservation on Pig Receiver
(OP)
We are carrying out Nitrogen preservation on a pig receiver at a pressure of 0.5 bar as specified in the procedure. A leak test carried out on this facility at 15 bar could not detect any leak but yet yet we kept on experiencing drop in pressure (15 to 6 bar in a week). I will appreciate advice from this forum on the next line of action as all the mechanical joints and barrel door have been properly checked. The pig receiver is designed to hold a pressure of 80 bar.





RE: Nitrogen Preservation on Pig Receiver
Ditto the door seals are very rarely completely and absolutely bubble tight. Your relief valve may be passing every so slightly.
If you really want to seal this vessel absolutely and this seems a bit unecesasy, then you will need to examine the leak tightness of each valve.
IMHO, there are probably so many possible fugitive leak paths that I would question whether it is required.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Nitrogen Preservation on Pig Receiver
RE: Nitrogen Preservation on Pig Receiver
If you need to track it down, helium in the nitrogen with a suitable detector is great for tracking down small leaks.
Matt
RE: Nitrogen Preservation on Pig Receiver
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist
RE: Nitrogen Preservation on Pig Receiver
zdas04, the pig receiver have adequately isolated using a blind so we dont have an issue of gas passing.
RE: Nitrogen Preservation on Pig Receiver
RE: Nitrogen Preservation on Pig Receiver
For leak detection you should buy a gas detector. http://www.lacotech.com/leaktesting/handheld-leak-...
A nitrogen/helium mix provides the following benefits:
1. improved detection. It can detect much smaller leaks due to the size of the test gas molecules. Helium molecules are far smaller than nitrogen molecules and so are better able to pick up small leaks.
2. safe and easy to use, inert and non-flammable. The leak detection mix is compatible with all standard pressure testing equipment (including nitrogen regulators) and is suitable for leak testing any size of system.
3. cost effective.
There are also firms that will do this test for you.
http://www.heliumleakdetection.net/Helium-Leak-Tes...
RE: Nitrogen Preservation on Pig Receiver