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We have a peculiar problem. Our pressure vessel contractor has formed a 15% torispherical dish instead of 2:1 ellipsoidal. The material is 32 mm, 516 Grade 70, 600 mm Dia. The mistake has been realised after the dish has been welded to the shell. Now he wants to cut the dish and reform the shape...

As per ASME SEC VIII, Div I , certain sizes of openings in Pressure vessels not subjected to rapid fluctuations in pressure are exempted from reinforcements. What exactly does it mean by 'rapid fluctuations'? Can it be quantified?

The code refers to ASME Part II A for selection of material. As per part II, SA 516 Gr70, UT is only optional / SR. So my interest is to locate the guide lines in selecting the appropriate UT code in my case.

I am making a pressure vessel as per ASME VIII div I for crude oil seperator. My design pr/temp are 1440 psi / 100 DegC. I have various size (1" to 6") nozzles (seam less pipe) to be attached to this. I want to know if it is mandatory to provide RF pads for all nozzles.

I am making a pressure vessel as per ASME VIII div I for crude oil seperator. My design pr/temp are 1440 psi / 100 DegC. Shell material: 32mm thick, A 516 gr70 plate. If I procure normalised plate, is it required to carry out any SR / normalising after rolling prior to welding? Is it...

For nozzle attahment to SA106 pipes and SA-515 formed ends and to SA-105 600 # RTJ top flanges for nozzle (NB-40, NB 100) reinforcement how to choose between RF pads or Weld neck nozzles? Is it possible to achieve one side full penetration weld of these nozzles with stick weld?

For D category weld attachment of nozzles on 24" Seamless pipe (SA106 GrB shell) which is a better alternative.. RF Pads or Long weld neck Nozzles?

I have a 24" SA 106 -Sch 100 Seamless pipe(Max Working pressure=1440 psig @ 25 Deg C, petroleum crude) for vertical seperator with top head as 600# RTJ flange of SA 105 and bottom as formed end of SA516- GrB. How to decide between a slip on flange or weldneck flange?

I have a 24" SA 106 -Sch 100 Seamless pipe(Max Working pressure=1440 psig @ 25 Deg C, petroleum crude) for vertical seperator with top head as 600# RTJ flange of SA 105 and bottom as formed end of SA516- GrB. How to decide between a slip on flange or weldneck flange