ASME and Penstock piping
ASME and Penstock piping
(OP)
We have been fabricating Penstock piping for hydroelectric dams from 6' diameter to 26' diameter. All welding has been in accordance with ASME Section VIII BPVC, and all fabrication is in accordance with ASCE no. 79 my questions are:
1) We now have a customer that states 100% Radiographic testing is required per ASME, I can only find this requirement for lethal service am I missing something?
2) Doesn't any single chamber pressure vessel shop constructed to ASME Section VIII require a U-1A tag?
Thank you in advance for your help,
Sam
1) We now have a customer that states 100% Radiographic testing is required per ASME, I can only find this requirement for lethal service am I missing something?
2) Doesn't any single chamber pressure vessel shop constructed to ASME Section VIII require a U-1A tag?
Thank you in advance for your help,
Sam
Sam Bruno





RE: ASME and Penstock piping
2) Yes, Section VIII does require you to mark the vessel with an official Code U Symbol per UG-116. Section VIII also requires all welding to be done by a company holding a Code U Certificate of Authorization. So if your company is doing Section VIII welding, presumably you have a certificate and you have someone in the company who understands all of this.
RE: ASME and Penstock piping
Does the contract state that the design has to be in accordance with ASME B&PV Code Section VIII?
Does the contract state that the fabricator has to hold an ASME Stamp and does the vessel require an ASME Code Stamp?
If the contract states the pentstock has to be fabricated by an ASME Stamp holder, that means the fabricator must hold the proper stamps and there is an AI involved to check the calculations, materials, fabrication, etc.
I worked with a vessel shop that built some vessels that were ASME stamped vessels and they build vessels that were designed and fabricated per ASME, but were not stamped. It depended on where they were being installed and whether the individual state required the ASME stamp or not.
Best regards - Al
RE: ASME and Penstock piping
RE: ASME and Penstock piping
ASME VIII Div 1 Scope Clauses U-1 (d) (e) & (f) appear to exclude this type of piping from the code.
Am I missing something basic here ? (other than it being a contract requirement)
Regards,
Kiwi
RE: ASME and Penstock piping
RE: ASME and Penstock piping
And don't get me started about the N-stamped toilet. Suffice it to say that it really did get built, stamped and installed.
RE: ASME and Penstock piping
Add to your list overhead cranes that were asked to be built in accordance with Section VIII! I've seen it in a spec.
RE: ASME and Penstock piping