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Thanks Mikes. Fabrication vendor is confirmed that material is fine grains and normalized so they using Curve B

the way I interpret UCS-66, SA387 Gr. 11 is assigned to the A curve for impact exemption. Some pressure vessel fabricators have been interpreting UCS-66 as saying that this should be on the 'B' curve. Are they right?

mskds545 (Mechanical) Thank you but we can use pad due to obstruction in rolling operation at vendor shop. This was our first choice.

About PWHT and after hydrotest welding Hello Friends, I have some doubt about ASME Div 2 clause interpretation) for following issue facing one of my task. Due to some issue, We need to weld non-pressure(piping/platform cleats) after PWHT but before Hydrotest. Any one can confirm my understanding...

As said earlier, Rolling operation not allows RF pad on rolling path. So we are not using RF pad, instead checking the code acceptability of the welding of cleats directly on shell after hydrotest.

Equipment: Pressure vessel Thickness: Thickness More than 200mm Code: ASME section VIII Div 2 and U2 stamp. As code said that No welding is allowed after Hydrotest. But piping modeling design progress is far ahead and other hand vendor is worked out the all the possible roller position but...

Generally Allowable stress value is specified in Client specification and that need to be follow. In my current project Anchor bolt material is same as yours ASTM F1554 Gr 36. we are using allowable stress value 103MPA and Shear 89Mpa.

Thank you marty007. I want this. Interpretation Number : VIII-1-95-27 vertical static head should not considered in horizontal hydro test condition.

What should be the allowable bending stress for non pressure carbon steel attachment(e.g platform ladder cleats) vendor has taken 0.9 of yield stress but I am insisting him to 0.66 of yield stress AISC manual.

Thanks to all. its understand that PWHT hold time and temp based on shell thickness.

Static head added in design pressure of Hydro test in Horizontal vessel position? I don't know exactly but there is one addendum to code to not consider Static head. Can anybody have reference of that addendum.

Mr.Mike Thanks for reply. I already read ASME before posting but it was not clear to me. As per UW -40 17-f, Nominal thickness interpret as Highest for PWHT consideration. See below two clause. (f) The term nominal thickness as used in Tables UCS-56-1 through UCS-56-11, UCS-56.1, UHA-32-1...

Vessel shell Thickness is 150mm Head is hemispherical and thickness is 90mm. Head fiber elongation is less than 5%. My question is whether Head is required PWHT? shell plate thickness is 150mm , Vendor has selected PWHT cycle time and temp as per UCS 56.But he has not specified for Head. Incase...