Folks,
Is it necessary to use separate Form P-4 (partial data report) for drums etc. if the same has already been mentioned in supplementary sheet (Form p-6) of Master Data Report (Form P-3) in ASME I Boilers. Thanks for your kind update.
Dear Fellows, I need to weld a flange of SA-350 LF2 Cl1 neck thickness 12.7 with shell of SA-516 Gr.70 of same thickness (Joint Cat. B weld). Is it mandatory to PWHT the weld with reference to ASME VIII Div.1-2019?
Dear Experts, I have seen a nameplate on shell and tube type heat exchanger designed on ASME Code with all parameters same for shell as well as tube bundle like design pressure, design temperature, MAWP, Hydrostatic test pressure etc. What is the use of exchanger if all parameters are same for...
My question to Mr. Steve Jones in connection with my quote of Revamping of pressure vessel from sweet into sour service is:
If steel plates for shell and dish ends in fabrication of pressure vessel found to be ASME SA-516 Gr.70 with normalized condition, having maximum hardness less than 22HRC...
Thanks for the great help both from SJones and EdStainless. At present scenario, No PWHT performed but not required as it is not a service requirement (UW-2), neither required in accordance with A-2.1.4 of NACE MR0175, not mandatory as per UCS-56-1 of ASME VIII Div.1. Carbon steel wetted steel...
Dear Folks,
What are the requirements if I need to revamp a sweet service ASME pressure vessel into sour service. Please reply in the light of NACE MR0175/ ISO15156-1:2015.
Dear Experts, any idea how heating cycles for PWHT in NACE MR0175, required for the qualification of PQR for pressure vessel with P-1, Group 2 material where PWHT is a service requirement (UW-2) is different than the heating cycle mentioned UCS-56 of ASME VIII Div.1. Thanks for your expert advice!
Dear experts, A vessel is subjected to PWHT due to wet sour service. Is it mandatory that PQR needs to be qualified with PWHT cycle complying with NACE MR 0175 or compliance with UCS-56 would be sufficient? All material conform to the requirements of NACE MR 0175 / ISO 15156. Thanks for your...
Dear Experts, How can we post weld heat treat longitudinal weld seams in ASME VIII Div.1 pressure vessels in accordance with UW-40 and UCS-56 if car bottom furnace or oven is not available to heat treat the vessel in one go and we don't have any vendor providing PWHT services around. Thanks for...
Thank you all for the great replies. In my opinion, instead of vent hole in re-pads inside the vessel, we can leave one corner of re-pad un-welded which can be welded later once all the gases are out. Thanks again.
Dear All,
According to UG-37(g)of BPV Code VIII Div.1, vent holes in reinforcing plates and saddles of nozzles attached to outside of a vessel may be left open or may be plugged when the vessel is in service. My question is what about vent holes in re-pads of supports inside vessels? Any...
Thanks r6155, Sorry for not conveying complete details. Vessel is in lethal service while all the requirements of UW-2 have been met. From the replies I received, I think that we can PWHT vessel with electrical resistance method as allowed in UW-40(a), without PWHT of cold formed parts having...
Thank you folks for the replies. My question to r6155 is: Why PWHT is mandatory for the cold formed parts like dished ends if the resulting extreme fiber elongation doesn't exceed 5% as referred in UCS-799(d)for the vessels in Lethal service?
Hi,
A vessel was hydrotested at our vendor's shop whose test pressure was 116 PSIG in accordance with UG-99(b) of ASME VIII DIV.1. but the vessel was given pressure of around 300 PSIG due to some miscommunication. Although vessel withstood the pressure but what is its effect on vessel and how to...
According to UW-2(c)(3) when fabricated of carbon or low - alloy steel, such vessels shall be post weld heat treated. My question is can we post weld heat treat vessel according to UW-40(a) using soak band instead of heating the vessel as a whole in an enclosed furnace. if so what are the...
