Shop material and field material in piping isometrics
Shop material and field material in piping isometrics
(OP)
In piping isometrics, in general practice, what is the size boundary for shop material and field material? Thanks.
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Shop material and field material in piping isometrics
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RE: Shop material and field material in piping isometrics
RE: Shop material and field material in piping isometrics
if it welds up to make a spool in the shop its shop material
if it is bolts gaskets valves threaded nipples, etc that is not required to make a fabricated spool in shop and will be iinstalled when the iso is assembled....it's field material
RE: Shop material and field material in piping isometrics
The Question:
"In piping isometrics, in general practice, what is the size boundary for shop material and field material?"
My answer:
Over the past fifty or more years the most common answer to this has been:
• 3” and larger piping is Shop Fabricated
• 2 ½” and smaller piping is Field Fabricated
• All assembly material (valves, bolts, gaskets, etc.) is Field material
However, this is not an answer that fits all situations. These situations might include:
• There have been projects where considerations such as exotic material and the required welding process forces the shop fabrication of all sizes.
• There have been projects where all piping was shop fabricated because there is no space available at the job site to receive, store or fabricate piping of any size.
• There have been projects where local Union agreements forced different size breaks for Shop versus Field
• There have been projects where the plant location (Arctic or desert) will cause different decisions for shop versus field
• There have been projects where the location and local economy has provided the availability of vast trainable labor resources to be able to receive bulk piping material and Field fabricate all piping at the job site
The bottom line on this subject is there is the Rule and then there are the Exceptions. Each project needs to carefully consider all the issues for their project and make the right choice.
RE: Shop material and field material in piping isometrics