PRV Replacement
PRV Replacement
(OP)
We were told by an out side consultant that we are required to send off our PRV's back to the manufacture as we replace them every five years. I can not find this recommendation/rule in any of the guideline books I have. Is anyone doing this?





RE: PRV Replacement
What is the purpose of the PRV and where are you from?
RE: PRV Replacement
Cheers,
John
RE: PRV Replacement
We are a small company and do not have on site calibration guys.
RE: PRV Replacement
Removal, repair, calibration, and re-installation should be planned around shutdown periods for the plant. Whether or not you send the valves out for refurbishment, or have someone come in to do the work at your company, if your shutdown period is shorter than the time required to complete an overhaul, then of course you would need new replacements to be available to install immediately.
I don't know where you are, but as I said, I am unaware of any requirement to send PRVs back to the manufacturer, and can only imagine that happening if you wanted them to overhaul the valves and there was no one locally available to perform the work and recalibration. The valves themselves should last longer than 5 years (depending on the environment) but maybe some of the internal bits will require replacement during the overhaul.
Cheers,
John
RE: PRV Replacement
The requirements for relief valves in ammonia service are goverened by ANSI K61.1.
Replacement dates are affixed to the valves.
Para 5.8.15 of K61.1 gives a maximum of 5 years.
The RV manufacturers love it....
http://www.henrytech.com/Tips/HT-TT11.pdf
-MJC
RE: PRV Replacement
RE: PRV Replacement
RE: PRV Replacement
That is not of lack of experience with ammonia. That is more a bad attitude of the PRV manufacturer.
RE: PRV Replacement
Or do manufacturers require the valves to be returned so that they can ensure that the valves are taken out of service after 5 years and scrapped?
RE: PRV Replacement
RE: PRV Replacement