Do you know where your piping line lists are?
Do you know where your piping class sheets are?
Why are they important?
When a plant piping system has a break, a crack, a defective valve, needs a modification, or needs to have some analysis done, the pipe line design pressure and temperature rather than the line operating pressure and temperature, along with the designed piping materials and thicknesses, must all be considered in selecting the proper materials, the proper repair techniques, and the proper Code required inspection & testing methods.
Why find them now?
To save time in addressing piping situations during a forced outage situation.
How do they help save time?
These two documents contain critical information regarding plant piping design pressures and temperatures, piping materials, piping thicknesses, and other technical information that usually is not found in other documents including the plant’s piping drawings and operating instructions.
Where are they found?
Piping line lists are usually in some document format rather than on a drawing; such formats might be Excel files, Word files, computer print outs, pdf files, etc. Piping class sheets are usually in some document format rather than on a drawing; such formats might be Word files, computer print outs, pdf files, etc. This leads to the common situation that both are buried in the plant construction document files and are not readily found, if the plant has them at all.
What to do about this?
Have your plant engineer (if there is one) or some other responsible plant staff person locate these documents and place them electronically on the plant server filed for ready access. Copies of the plant P&IDs should also be similarly filed along with the line lists and pipe class sheets since all three of these important documents work together.
Any questions on this?
Call Dan Rottler, NAES Engineering Dept., 425-270-6410