Piping Pressure Design

I assume you mean pressure loss due to friction.

http://en.wikipedia.org/wiki/Darcy-Weisbach_equation

http://en.wikipedia.org/wiki/Hazen-Williams_equation

you could try http://www.engineeringtoolbox.com

not just for piping but some other engineering stuff

Please refer to the following CR4 thread for design: Re: High Pressure Steam Pipe

Note. According to ASME code, there are a lot of codes related to the type of piping you use : such as Power piping ASME B31.1, Refinery piping ASME B31.3, Liquid hydrocarbon pipeline ASME B31.4, Gas pipeline ASME B31.5, ... etc.

Ok, I know that Codes, But is there another way to get it??? :S

As you know (well, not all jejeje) Im doing my Thesis about "a hydrostatic testing laboratory for a Company" I have the procedures to do the testing (following API 1110 ASTM E1003 and other ASME and API Codes recommendations) and Im designing the equipment (pump, gauges, chart recorder, etc.)

I said the testing pressure must be determined by the piping owner but My Thesis Director said that there would have a table to obtain the pressure testing.

What do you think? Must I do that table? or Must I leave to owner for obtain that "pressure testing"?

Thanks a lot in advance

Thanks Abdel!!!! OK I will do that.

A last question, do you know the API Spec 5L? In this there are some tables with minimun test pressures. What do you think about it?

My post #6 is for hydrostatic test pressure for a piping system which was completely fabricated and constructed in the field/plant and required to be hydrostatically tested. But the hydrotest included at API 5L is for hydrotest of single pipes at the mill where the pipes were produced for the 1st time. The mill hydrotest shall not compensate for the hydrostatic test after complete erection of piping system at field. There is a difference. For hydrotesting of pipelines (constructed and full welded), may be the pressure shall be held for 24 hours, where as the hydrotest for each a single pipe produced at a mill shall be according to API 5L and held for few seconds only.

API 5L Para. 9.4.1 Hydrostatic Test Requirements :

Each length of pipe shall withstand, without leakage, an inspection hydrostatic test to at least the pressure specified in 9.4.3. Test pressures for all sizes of seamless pipe and for welded pipe in sizes 18 and smaller, shall be held for not less than 5 seconds. Test pressures for welded pipe in sizes 20 and larger shall be held for not less than 10 seconds. For threaded and coupled pipe, the test shall be applied with the couplings made up power-tight if power-tight makeup is specified on the purchase order, except that pipe sizes larger than 123/4 may be tested in the plain-end condition. For threaded pipe furnished with couplings made up handling-tight, the hydrostatic test shall be made on the pipe in the plain-end or threads-only condition or with couplings applied, unless otherwise agreed by the purchaser and the manufacturer.

So for hydrotest of single pipes in accordance to API 5L, you have to follow the tables described at Para. 9.4.3 Test Pressures:

The minimum test pressure shall be the standard test pressure given in Tables 4, 5, 6A, 6B, 6C, E-6A, E-6B, or E-6C; the alternative test pressure given in Tables 6A, 6B, 6C, E-6A, E-6B, or E-6C if so specified in the purchase order; a pressure higher than standard, at the discretion of the manufacturer unless specifically limited by the purchaser; or a pressure higher than standard, as agreed between the purchaser and the manufacturer (see Note 1). The minimum test pressures for grades, outside diameters, and specified wall thicknesses not listed shall be computed by the equation given in Note 2 below................................

Thanks a lot, your explanations have been a huge help to me.

Thank you Eduard, you are welcome.

But CR4 states that when you get a huge help from a such post, you may click its rank "Rate" for a few times .......... hahaha.

hahahah yeah sure, I was do that so many times because you help me a lot

Yes Edward,

But the Score 1 for Good Answer doesn't added to the count, at least 2 scores for the same post shall be added as Good Answer 1. That is just an explanation for the procedure of Score for Good Answer .

Al Salam Alaikom,

i'm working in Kazakhstan and i'm facing a little difficulty with a "method statement" (working procedure) for the Flow of activities, documents and final signature of the post Hydrotest activities (REINSTATEMENT Activities).

Do you have any suggestion?

If yes, pls. post it to me on this address: aironyx@hotmail.com

Thanks

Wael Moustafa

Dear Abdel Halim Galala, I need your tip for my trouble: We have update 6" and 8" launchers and receivers on gas pipeline (#2500). And now we shall make hydrostatic test. I have information bout pipelines: Material X60. Design pressure 4118 PSIG, Design temperature 110C. So, my questions... Which standard I need to take Hydrostatic TEST pressure? And which procedure for these traps testing? Thanks in advance.

Dear ANDREI,

You can easily apply the rules of ASME B31.3 (even the fluid inside the pipeline is a gas) and you can use ASME B16.5 if the rating/class of flanges up to #2500. For High Pressure Piping (for those piping components with class/rating over than #2500), you can use Chapter IX of ASME B31.3.

Thank you. But, can I calculate the Hydrostatic pressure for Launcher/receiver as analogy I calculate for pipeline or specially for these parts (excluding main pipeline) I need other calculation? For example - I calculated H.t.pressure for pipeline X60, WT=0.5in, D=6.625in. And as per limitation in API 5L (para 9.3.4) I have 3000psi pressure. Can I use this value? Because max operating pressure is p=1750PSI.

There are many links in this field, but at the moment you may refer to the following related linke to get what you are looking for:

- www.spiraxsarco.com

- www.pipeflow.co.uk