Dear experts
As you can see in attached P&ID there are two conventional spring loaded safety valves on a steam turbine extraction line.
PSV-30476A with set pressure=34barg & PSV-30476B with set pressure=35.7barg
The problem is that sometimes we are faced with premature opening of PSV-30476A while PI30454,PT30401 PT30403 show normal pressure which is 30barg.
We have checked all possibilities such as: CDTP, process data, sizing calculation, spring and…
Despite everything is according to data sheet, problem is still exist.
I was wondering if you could find any reason for that.
Regards
Rohollah
Attached Files
Edited by rohollah, 26 January 2015 - 09:19 AM.