Isometrics and Cut-sheets

[jdogg05]

Hi,

What is the purpose of a cut-sheet? Isn't all the information for fabrication on the actual ISO? Further, aren't you only supposed to build off of IFC ISOs? Is the sole purpose of the cut-sheet to show where the FWs are, and thus call out spool numbers?

Thanks

 

[Gator]

Field welds, field-fit welds and spool numbers can also be on the iso. The spool fabrication drawings will contain heat numbers, welding procedures, part weights and the like.

A chapter of 'The Planning Guide to Piping Design' on shop fabrication is available at

http://pipingdesign.com/planning_guide_piping_design/beale_book.pdf

Paul

Piping Design Central

 

[jdogg05]

So a cut-sheet is a spool drawing? I am getting the impression that people use the wrong terminology... Are the cut-sheets what the fabricator provides to the client to indicate the as-built condition of the spool (with heat numbers, weld and RT callouts)?

 

[Gator]

Yeah, regional/industry terminology (not to mention translations), it can be confusing.

I've always called what you're referring to as spool drawings. They are generally provided by the piping fabricator. In the old days, creating these used to be an entry-level job for a piping draftsman, allowing up close detailed exposure to the fabrication process. Now it's often partially automated by software like SpoolGen or AcornPipe.

A 'cut sheet' can also refer to a catalog sheet depicting equipment or components.

As-builts (if ever done) are generally markups of the isometric (not the spool drawing) depicting the actual installed piping. In my experience, these are not always done, since there never seems to be time/money near the end of the project and it's easy to just let this slide.

Paul


Piping Design Central