ASME Section 1 historical relief requirement
ASME Section 1 historical relief requirement
(OP)
Hello-
I am sizing relief devices for a client who has an ASME Section 1 boiler. Per the current code, if I set the valve at the MAWP, then my overpressure is limited to 6%.
My client wants to invoke relief requirements for equipment at the time of installation (not necessarily current code). The boiler in question was ASME code stamped in 1976. So, do you know if the relief requirements in 1976 were still at that 6% limit or was 10% allowed then?
Thanks!
I am sizing relief devices for a client who has an ASME Section 1 boiler. Per the current code, if I set the valve at the MAWP, then my overpressure is limited to 6%.
My client wants to invoke relief requirements for equipment at the time of installation (not necessarily current code). The boiler in question was ASME code stamped in 1976. So, do you know if the relief requirements in 1976 were still at that 6% limit or was 10% allowed then?
Thanks!





RE: ASME Section 1 historical relief requirement
For multiple PSVs, the 1st PSV can be set at MAWP with 3% overpressure. The 2nd PSV can be set at 1.03 x MAWP with a 3% overpressure. This gives about 6% accumulation for the 2nd PSV.
I do not know the history precisely, but it's been this way for quite a while.
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.
RE: ASME Section 1 historical relief requirement
My client is trying to invoke a 10% over-pressure rule (116% for multiple devices), similar to an ASME Section VIII vessel. Their thinking is that the 6% rule was not in effect at the time of the equipment installation in 1976.
Thanks again-
RE: ASME Section 1 historical relief requirement
RE: ASME Section 1 historical relief requirement
I started work in 1979. I don't recall hearing about Section I ever having overpressure rules exactly like Section VIII. However, I have had very little experiences with Power Boilers over the years, and I don't know for sure. Your best bet here, is if don1980 knows and replies. If not, contact the ASME and/or NB with this historical question. They have a good many gray haired folks that probably know.
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.
RE: ASME Section 1 historical relief requirement
It's important to understand that Sec I boilers are regulated by the state, and these boilers require inspections by an independent boiler inspector. If the inspector finds that you're not in compliance with ASME boiler code, then they can deny an operating permit. Obviously, the client doesn't want that to happen, so explain to the client that they can't apply their own interpretation of code. Before making a decision to go beyond 6% accumulation (even if the 1976 code allowed a higher value) I would check with the inspector first. You'll find their contact info on the boiler certificate that is posted at the plant site.
RE: ASME Section 1 historical relief requirement
On the other hand, and for reference if anyone else needs to know.....
I did find a copy of the 1971 ASME BPVC Section 1 code at my local University library. Not being a student, I couldn't check it out but was allowed to freely read. It does still have the 6% rule in effect as of 1971.
THanks everyone!