When did the dimensions change for ASME B16.21 non-metallic gaskets? We use the old style where gasket ID = Flange ID. I want to reference the correct year of the B16.21 standard in my purchase requisitions.
Peter Morenc, Reliability Engineer Eco-Services.
We manufacture and store sulfuric acid on site in tanks built to either API 620 or API 650. All tanks have been modified to NACE SP0294 (Sulfuric Acid Tank standard). Both API 653 and NACE require an internal inspection at 1/2 the remaining life of the tank bottom.
Is there a best practice on...