Pipe schedule number not found on P&ID's
Pipe schedule number not found on P&ID's
(OP)
Hello guys, i work at a fertilizer plant, and as i go over the P&ID's looking for the schedule numbers of pipes existing in the plant, it seems that i can't find it in the drawings. I looked for the data sheets of the valves that are in the plant and found out that the valves has corresponding schedule nos. Is it safe to assume that the pipings and valves have the same schedule nos, provided that they exist in one system?





RE: Pipe schedule number not found on P&ID's
Please explain more about that company tht don´t use pipespecs.
RE: Pipe schedule number not found on P&ID's
RE: Pipe schedule number not found on P&ID's
Check the legends and abbreviations section if there is one for your P&IDs. That should list how the piping specs are called out. From there, you should be able to get the pipe schedule from the piping specs. For example, the company I work for uses piping notation like 2" HPS-E1-HC where the 2" is line size, HPS means high pressure (200 PSI) steam, E1 is the piping spec class, which according to the legends and abbreviations is 300# RF rating in carbon steel, and the HC means the pipe is insulated for heat conservation. From my piping specifications (from the maintenance supervisor, and also the corporate website), the E1 specification refers to PIP PN03CS1S02, which correlates to STD (sched 40) pipe for a 2" line. If the line had been 1", it should be XS (sched 80) per the standard. Check with your maintenance group, mechanical integrity engineer, or corporate engineering to see what piping specs you use and also for the abbreviation list for your P&IDs. Hope this helps.
Regards,
Matt
Quality, quantity, cost. Pick two.
RE: Pipe schedule number not found on P&ID's
I agree with MatthewL. The schedule number should be indicated in the P&ID. The "Line Identification Number" in the legend sheet should indicate what you need.
Regards,
Christopher Kenneth Choa
RE: Pipe schedule number not found on P&ID's
Good luck,
Latexman
RE: Pipe schedule number not found on P&ID's
RE: Pipe schedule number not found on P&ID's
A good guess is schedule 40 for most CS pipe and 10S for most SS pipe in the fertilizer plant. Unless you are in acid service which may increase wall thicknesses for corrosion resistance.
Can you be more specific about the fluid media?
Good luck.
RE: Pipe schedule number not found on P&ID's
I am looking at a pipeline that carries sulfuric acid, as of now, i have not seen the sched no. specified in the P&ID, but i;ve seen the pipe spec not for the pipe itself but for the valves, is it safe to say that the sched no. (thickness) of the valves on the pipeline corresponds to the sched no. of the pipeline itself?
RE: Pipe schedule number not found on P&ID's
You need to find the pipe specifications this piping was originally designed to, before you make any modifications. Sulphuric acid is a service where velocity is critically important and corrosion allowance is essential. Failures have serious consequences.
If the information is not available to determine the original design intent, any modifications require re-engineering by competent people knowledgeable in this service to ensure that they're safe.
RE: Pipe schedule number not found on P&ID's
rmw