I work with section VIII Div 1 pressure vessels. I am looking for the relevant section covering the allowable tolerance between the ID of a slip on flange(either 16.5 or 16.47) or custom, and the OD of the pipe it slides over. Typically SA105 and SA182 304/316 materials for the flanges, SA240 and SA516Gr70 for the rolled shells.
Our Engineering/Drafting department likes to make custom flanges to go over rolled shells with incredibly -I'd argue unreasonably - tight clearances between the nominal OD of the shell and the ID of the machined flange. While we probably can't take the maximum out of roundness from UG-80, add plate thickness plus tolerance, and over bore the flange to accept that, Not having to try and slide a 60'' welded stainless steel shell inside a 60.0625'' flange ever again would be nice. I am struggling to find an explicit reference to this tolerance in Sec VIII, and such a thing would be helpful to get everyone on the same page and produce a simple chart for our draftsmen.
Thanks in advanced.
Our Engineering/Drafting department likes to make custom flanges to go over rolled shells with incredibly -I'd argue unreasonably - tight clearances between the nominal OD of the shell and the ID of the machined flange. While we probably can't take the maximum out of roundness from UG-80, add plate thickness plus tolerance, and over bore the flange to accept that, Not having to try and slide a 60'' welded stainless steel shell inside a 60.0625'' flange ever again would be nice. I am struggling to find an explicit reference to this tolerance in Sec VIII, and such a thing would be helpful to get everyone on the same page and produce a simple chart for our draftsmen.
Thanks in advanced.
