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I am an operator in OHIO, USA (go bucks!) Mostly Utica gas production and midstream stations. We have been AUDITED by a DOT inspector who is claiming OHIO has now adopted DOT 49 CFR Parts 191,192,..etc. Fine. Thing is, at our compressor stations vessels are all ASME 31.3 tested to 1.3 X MAWP...

Thanks D56; are you familiar with any jurisdiction requirements? maybe NE states (OHIO, PA, WVirginia...)

Howdy howdy; *Is there an expiration on certified MAWP via U-1A form? I did not see any reference on U1-A as to how long from compliance sign-off is the rating good for etc...(?) Particularly, I have vessels (used in gas industry) that have been in a yard for 10-15 years. Or is there a safe...

moltenmetal (et al.) one follow-up; if we neede to run for example 620psi (on very steady regulator) into a 645 MAWP vertical scrubber and cannot tolerate any leakage via PSV, any design suggestion or is it just not feasible; thanks

thanks y'all very much; on cylinders we are advised to replace spring-loaded with pilot-operated PSV's, i just wasn't sure if there was protocol common on other vessels.

i have a vertical suction scrubber on a nat gas compressor unit; can I run at or below MAWP? or need to operate at RDP (about 90% of MAWP) - thank you.