PSV Inspection Sch.

[nong]

Each PSV is planned to inspec every year.

If we design to have 2 PSVs are installed with 100% capacity(for on-line maintenance), one on-line, on-standby.Can we extend inspection schedule to every 2 yrs?

My idea is we can't, we have to inspect all PSVs as sch., but I can't find in API.

If u know what API part, pls inform.

Thank you

 

[Teeboog]

Go to API 510 paragraph 4.5. The intervals are based on past performance. Two years are normal for new equipment without past performance records. The maximum interval is ten years. I don't know if API addresses redundant PSV's; however, I would certainly want to be sure that when I switched over to the spare, it was in good condition.

 

[dcasto]

We use a system to calculate the relief valve testing interval. The service conditions from items like pulsation, corrosivity, size, location, set pressure, ect.

We also take into acount past history of use, previous inspections, age, other safety systems. We then use this data to set the testing period. For example, a sour fluid on a pulsating line set at 1000 psig that has opened at least once a year will be inspected every 6 months. A relief valve on a propane storage tank that hasn't open in the last two years will be inspected every 5 years (per ASME section VIII)

 

I'm sorry, some, some misunderstanding ?
I mean testing, not inspection. I try to find that are there state about testing frequency of stand-by PSV.
I haven't seen in API 520,521,526..etc.

Are there in ASME 8, unfortunately it's lost from my office.

Thanks

 

[dcasto]

On PSV's I equate testing and inspection. There are some issues with just putting a test ring under a relief valve and making it open and calling it good. But that's an entirely new forum.

 

[nong]

It said in API RP14C. Shiuld be tested annually.

 

[kstaylor]

Pressure relief valve testing/inspeciton frequency is addressed in both API-510 as well as API-576.