Richard Ay,

In pipe Stress analysis, nozzle load are exceed the allowable in that case we have to check the WRC 107/297. i give a actual load to vendor for calculating WRC 107/297 requirements. we also do the same load internally.

Actual nominal thickness of vessel is 12.7mm material is SA 106 gr.b. but vendor considered the vessel thickness as 11.1125mm. Hence the WRC 107/297 fails. if we considered 12.7mm all load are within limit.

client response:

For the pipe where listed in table 2 of ANSI/ASME B36.10, shall consider the reduction 12.5% of mill tolerance. In this case, when the nominal is 12.7 mm wall thk of pipe or cap, so the minimum/actual thk that we have to stated in mechanical calculation will be 12.7-12.5% = 11.1125 mm.

My question, plate thk shall be 12.7mm why they did 11.1125mm for Negative mill tolerance. pls guide me