ASME Code for Suction Line of Centrifugal Pump

I am a little confused as to what you are looking for.

(I assume you mean para 302.2.4 from ASME B31.3)

Firstly, have you determined that you indeed have a problem? That is, have you performed the pressure calculation for the actual pipe you are using and an MAWP over design pressure? Are you going to exceed yield at temperature?

If you are not covered under paragraph 302.2.4 but you are governed by ASME B31.3 - you are out of luck. You shouldn't go "shopping" around for a convenient standard that suits your need at the time.

The only real option you may have is to look at API 579 for guidance.

Please reply with a few more details with your problem and what you are looking for.

Agreed, and high pressure in a suction line is an unusual situation.

Typical steel pipe could have allowable working pressure of something around 100 bar (depending on details), though flanges etc might limit it to a much lower pressure.

More detail needed.

Cheers........Codey

Code are codes but common sense indicates the pipe should withstand maximum possible pressure, plus any sudden surges should the discharge of the pump do something strange (leaking check valve on a parallel system) plus 10% plus corrosion allowance of 5% plus 1.5 x for hydrotest and the use of pressure safety devices should be limited and not considered failsafe.

If your suction pressure is approaching the maximum pressure rating of the pipe and fittings you would be well advised to verify that the pressure does not exceed the rated maximum pressure for the pump casing. Also take note that common centrifugal pumps with conventional stuffing box sealing, either packing or mechanical shaft seals, will require some modification to withstand higher than normal operating pressures.

Ed Weldon

thank you for reply

i hope that i have a good and close contact with you

I recommend that you contract or hire a p.eng who will stamp the calculations performed by him/her for your application. This will ensure complete accountability at audit time. If you are performing these calculations to comply with quality or technical specification requirements, then stamped documents are the best way to go. I've been burned like that before. You are probably only required to show calculations of performance and compliance, and also documentation that shows compliance as far as purchasing and receiving goes. even failure mode physical testing will not satisfy the auditor, but a document stamped by a P.Eng will.

chris