This, along with the weld verification is done via non-destructive testing. All materials and equipment involved in the “Bill of Materials” must be validated for approval.

Poor QA/QC may occur as a result of late changes to the P&ID, vendor drawings, or data from another discipline. Poor QA/QC practices result in incorrect fabrication, leading to costly rework. These include, but are not restricted to:Ĭhecking, or the quality assurance and quality control (QA/QC) of piping runs, is necessary to prevent failures or malfunctions. The purpose of any quality check is to verify that all the specifications, drawings, and other deliverables reflect the exact combination of the issues impacting the end product. The final drawing will show the desired pipe in a way that the length, width and depth are detailed in a single view, with associated symbols used for fittings, valves, and flanges depicted and scaled to the isometric grid. Attention to detail is a high priority when it comes to matching components to the pipe spool drawings.įabrication generally begins shortly after the issue for construction of isometric drawings. If revisions of piping isometrics need to be further evaluated, the fabrication schedule can fall behind. However, many projects issue drawings earlier.

Ideally, drawings should be issued after a 60 percent model review. They are typically generated from CAD software (i.e AutoCAD, SOLIDWORKS) and must address specified project requirements (pressure safety valves, process vents/drains, etc). Pipe spool drawings generally derive from 3D models and are drafted by a team of mechanical engineers. Pipe spool drawings include a list of material descriptions, pipe pieces, item numbering and pipe bending data. A typical pipe spool drawing consists of a graphical representation, bill of material, and a title block. It is their assignment to generate the drawings in several standard formats required by site managers and construction companies. Pipe spool drawings are generally a service provided by mechanical drafting teams.

Piping isometric drawing pdf