Pressure Relief Valve Change-out Frequency
Pressure Relief Valve Change-out Frequency
(OP)
With respect to pressure piping (and not pressure vessels), what is the required replacement frequency of PRV's. I have heard 3 years but, can not find it in a code (i.e. B31.1/3/or 9). Thanks.





RE: Pressure Relief Valve Change-out Frequency
RE: Pressure Relief Valve Change-out Frequency
Many follow API's lead on the subject...
API 510 (8th ed., 4th ad., 8/03), 6.6 - "Pressure relief valves shall be tested at intervals that are frequent enough to verify that the valve perform reliably." "Pressure-reliving devices should be tested and maintained in accordance with API Recommended Practice 576." "The intervals between pressure-relieving-device testing or inspection should be determined by the performance of the devices in the particular service concerned." "Test or inspection intervals on pressure-relieving devices in typical process services should not exceed 5-years, unless documented experience or a risk assessment indicates that a longer interval is acceptable." "For clean (non-fouling), noncorrosive services, maximum intervals may be increased to 10 years." And so on...
Utilities such as air, water, and nitrogen (friendly and non-threatening services) can usually have infrequent inspections/tests.
"Process" services are 5-year intervals, max., 2-3 years usually.
RE: Pressure Relief Valve Change-out Frequency
Then we looked up the values on each axis to determain frequency. We did a "common sence engineering" check and saw that our clean, dry low pressure natural gas lines had a 5 year interval and our rich amine psv's and lines had a 1 year inspection level.
RE: Pressure Relief Valve Change-out Frequency
RE: Pressure Relief Valve Change-out Frequency
http://www.eng-tips.com/viewthread.cfm?qid=15220
-MJC