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I found it, thanks for all the help JT.

Thanks, we have an IHS subscription. Is it listed under "Interpretations Volume 57"?

Thats perfect JT. Can you post a link to that volume?

Thanks JT. I definitely agree with the definition explanation. Obviously if ASME will define FV, then I'm sure they would accept it on their vessel. As for UHX-19.1, unfortunately thats for heat exchangers and they could deem that not applicable since this is a 50 L vessel. All the same...

Set the burst pressure the same as the PSV set pressure: 25 barg.

This is a question regarding the specified MAEWP on the vessel's stamp. We would prefer that our vessel's MAEWP says "FV" but the tank vendor refuses, saying code requires them to put an actual number. Currently, they are showing "15 psi". First, I find "psi" as a very gray area, especially...

Thanks for the info all, but none of this is in my scope. Sizing the PSV is the part of my scope. For "conservative" reasons, we will size the rupture disk according to API 2000.

Does ASME have a requirement for testing pressure vessels after a given amount of time? Pleckner does have a point that it has probably eroded with time and has weakened the vessel, but unless there is something that explicitly states we must test the vessel before designing a new PSV for the...

Pleckner, Is a vessel that is stamped in 1973 and is unmodified still valid as ASME, though it no longer meets ASME standards? If this vessel were designed today with its current specs, it would not get a stamp. This vessel's operating or design pressure does not exceed 15 psig. Our...

Actually, I think thats a misinterpretation. It only refers to OPERATING pressure, not design pressure. If my vessel has a stamped MAWP of 15, which doesn't EXCEED 15, then that means I'm OPERATING below 15. Since ASME states that my operating pressure must exceed 15 to be an ASME vessel...

Under the Scope U-1(c)(2): Based on the Committee’s consideration, the following classes of vessels are not included in the scope of this Division....(h)(1)vessels having an internal or external pressure not exceeding 15 psi (100 kPa);

I'm not about to search thru the code, but ASME.org's website says for Section VIII - Pressure vessels Div. 1: "This Division of Section VIII provides requirements applicable to the design, fabrication, inspection, testing, and certification of pressure vessels operating at either internal or...

But my vessel is not an ASME vessel, according to ASME section VIII div. 1 because the MAWP does not EXCEED 15 psig. Its MAWP is exactly 15. BUT, it is stamped, back in 1973 as an ASME vessel. If I put an ASME relief valve on it, I can't have a 15 psi setting. If I put a conservation vent...

I have a vessel with a MAWP of 15 psig, stamped as an ASME vessel back in 1973. We're relocating this vessel and a new PSV needs to be provided. Current ASME Section VIII Div. 1 states that to be a pressure vessel the rating must exceed 15 psig. How should I approach this relief...

I'm using equation 5 in API 521 to calculate the relief orifice size of a gas filled vessel. The explanation for the Tw value isn't very specific. Am I supposed to use the maximum wall temperature? Otherwise it would seem that Tw would just be equal to Tn, the normal operating gas...

We are well below the 3%, but because of standard PSV sizes we would need a change in piping. I understand what the code states, thats my reason for posting. I'll see if I can contact ASME and find a solid reason. Thanks for the responses.

What I'm searching for is the reason why ASME states that the connection to the inlet size of a PSV must be at least equal to the inlet size of the PSV. I currently have a 3" and need to upsize to a 4". The 4" is not a limiting factor. I'm trying to figure out why ASME will not allow using...

I think we may be confusing each other. I have a vessel with a 3" nozzle but have sized my PSV as a 4" x 6". I want to know why I cannot stick a 4" by 3" enlarger inbetween my PSV and vessel nozzle.

You'll have to convince me of that because I can't believe there will be a any kind of a pressure drop in a pipe going from 3" to 4" when you're coming from a 3000 gallon vessel.

ASME states that you should not use an enlarger before a PSV on a vessel. Can someone give me an explanation to why this is?