Section VIII Div 1 question:
Is it permissable to have a single pressure relief device for two pressure vessels in the same system ? Pressure relief device and piping are sized with the corect capacity to provide required over pressure protection.
AF-402 3rd sentence states"The exemptions for post weld heat treatment in Tables AF-402.1 and 402.2 are not permitted when the vessel is designed for lethal service. (AG-01.1(c)...."
However, the Notes of Table AF-402.1 for P1 material (2)(b)1,2,3,4, list conditions where heat treatment is NOT...
We have a vessel with shell material SA 765 Gr II clad with inconel alloy 625. Design temperature is 104 C. We will fit a non load bearing internal( alloy 825 ) to the shell. We plan to fillet weld (ESW process) the internal directly to the cladding. Vessel is in sour gas service.
Is hydrogen...