Recent content by dbday

r6155, would you recommend redoing the radiography after doing this ?

Hi, I have a flanged (weld neck) 4"NB nozzle (set on) in XS pipe on the side of a small pressure vessel. My customer wants to insert a measurement device in through the flange/nozzle into the vessel, but the outside diameter of the instrument is 100mm, which is bigger by about 3mm than the bore...

Hi, I have an 2205 duplex welding procedure that allows me to do butt welds under ASME code. Can I use this welding procedure to do the same welds in 316 stainless steel, or do I need to do a 316 specific procedure ? The duplex procedure certificate seems to suggest that the 316 P numbers are...

weldstan - that's what our local NDT company says, but I am no radiography expert

I am laying out a piece of 304 stainless steel equipment with a set through nozzle on an end cap. My client wants 100% radiography but I am unsure if/how radiography would be done on a set through nozzle in an end cap - its a 4"NB nozzle in a 10"NB end cap, all standard weight thickness. RT on...

EdStainless The pad is to be the same material as the shell - client requirement

Hi, I have an ASME VIII Div 1 vessel where I need to place a pad for a support over a circumferential head to shell weld. I understand that it is acceptable, with suitable radiography, to put openings across welded seams, and by inference, a reinforcing pad for said opening which would of...

mk3223 - So if, for example, I have a nozzle with a 6" i.d. but only a 1" hole in the shell then do I design as though there is a 6" hole in the shell ? r6155 - Taking my example above of a nozzle with a 6" i.d. - if the hole in the shell was 6" and it worked out that that this needed a...

Hi, If I have a set-on nozzle on the side of a cylindrical vessel where the hole in the vessel is smaller than the internal diameter of the set-on nozzle, do I use the actual hole diameter for the reinforcement calculations or do I stick with the internal diameter of the nozzle that is set on...

Hi, To qualify a welder to weld a set through nozzle on an ASME VIII vessel can I rely on a butt weld procedure that covers the thickness of the vessel, or I need to do a nozzle/plate procedure ? The nozzle is 2"NB XXS and the vessel is 10"NB XXS in 316 stainless. I am just trying to set...

So if I have a vessel which is made of materials where I have the usual mix of nozzle and flange materials, say A105 and A106B, where some some do, and some don't, have an 'N' on the certificate, it would seem to make sense (to me at least) to do a normalising heat treatment as the last...

Hi, Where a client wants a vessel made from A516-70N can you achieve that by heat treatment, or do you have to ensure that the steel has the N on the origianl mill certificate ? I understand what Normalising is, what it does etc etc - this is really a question about certification.

Hi XL, The internals are welded in position, so detachment should not be a problem. Thank you for the help.

Hi XL, See attached sketch. The unit is cylindrical in shape. It has pipe caps for ends (not flat as drawn) with couplings to connect. The internals rings are solid. The dashed line represents a perforated cylinder. I hope it is clear...

Hi XL, Gee, that sounds complicated, but helpful to my situation. My actual bar volume value for my empty vessel comes out at 51. Considering air and designing as a pressure vessel, it seems to me that this is just above the boundary PSV=50 where moves from SEP to Cat 1. Group 2 gases for...