1. The design conditions are checked against the line list.
2. The material for each item on the Iso BOM is checked against the code calcs. Size, wall thickness, material, fitting pressure class, flange rating, gaskets and bolts.
We used a check list to assure all the pertinent info is on the iso for the pipe shop, such as flow arrows, code stamps, spec / line breaks, container fit etc.
3. The isometric BOM is verified to show all the correct material required to build the spool is listed.