Schedule 160 pipe pressure rating

[handee]

Hi. I can't get my hands on a copy of the ANSI standards - can anyone supply this info? I need to know MAWP and burst pressure for 3/4" Sch160 304SS pipe. A copy of the applicable page would be tremendous!

Thanks!

 

[jsummerfield]

You need to find a library with industrial standards. ANSI really is not the organization that writes or publishes standards. ANSI determines that it is a recognized industry standard.

So redirect your question to ASME for piping standards. Now, what industry? There are different piping standards for different industries. Boilers apply a different standard than refineries and pipelines.

Piping engineers calculate the value of wall thickness suitable for conditions required. Then select a thickness from the schedules of nominal thickness depending upon the pipe specification, such as ASME B36.19M for stainless.

Different pipe tolerances exist. ASME B31.3 section 304 PRESSURE DESIGN OF COMPONENTS addresses pressure design for straight pipe on page 19 with a table with factors including Austenitic steels on page 20. The next thing to consider is temperature. Then, different stuff applies to bends, etc. See TABLE 326.1, COMPONENT STANDARDS. This refers to other standards including ASME B36.19M for stainless steel pipe.

This explanation does not get you to the answer thus may not help much. If you don't get a better answer, try the ASME in the codes and standards section.


John

 

[MJCronin]

fxm,

It all depends on the maximum operating temperature (and other factors)that you establish.....

Piping does not have an "MAWP" like a pressure vessel. ASME B31.1 requires that you (1) select an ASME approved material (2) calculate a minimum wall thisckness based upon your allowable stress and corrosion/threading allowances (3) select your pipe schedule

hope that this helps....

MJC

 

[handee]

Thanks John and MJ,

I'm still looking for a local library that has the ASME B31.3 or Becht's guide to the B31.3. This is an existing pipe, recently installed, used intermittently for high pressure water service (~10,000psi). We just want to comfort ourselves with the knowledge that we're under the burst pressure.

-Fran

Fran McConville
author of the Pilot Plant Real Book

http://www.pprbook.com

 

[TBP]

My Grinnell book shows 3/4" Sch 160 304 pipe as having a max pressure rating of 6,640 PSI. XXS is listed at 10,036 PSI. Not much of a comfort zone even on the XXS, and that's without any allowances at all.

 

[handee]

Thanks TBP - somewhere (on the web!) I seem to remember seeing that this pipe size and scehdule had a bursting pressure of 25,000 psi...is that any comfort?

Fran McConville
author of the Pilot Plant Real Book

http://www.pprbook.com

 

[jsummerfield]

Fran,
What is the temperature? I would be uncomfortable based upon the post by TBP.

Perhaps someone with a water piping specification that exceeds 10000 psi might advise the wall thickness and design temperature for the spec requirements in 3/4-inch. Perhaps they canverify that B31.3 is used to calculate the required wall thickness. This could get you to the right standard.



John

 

[handee]

TBP, thanks for that... what's the Grinnell book you are referring to?

-Fran

Fran McConville
author of the Pilot Plant Real Book

http://www.pprbook.com

 

[TBP]

"Piping Design And Engineering". I believe this arm of Grinnell was bought-out by Anvil, and the book is now published by them.

 

[PAN]

fxm,
In my understanding, if you conform to B31.3, you should not use bursting pressure for limit the allowable working pressure.

Allowable stress from B31.3 should be used for calculation. You should clarify your "intermittent high pressure service condition".

Moreover, please confirm that pipe is the weakest component in your piping system.

 

[bourk]

Depending on the type of industry and the '' process '' you're dealing with you can look in ASME B31.1 Power piping or ASME B31.3 Refinery and chemical process plant. They contain the maximum pressure you can safely hand. I even had a case where thermal oil( used instead of steam as a heat transfer media ) coming from a boiler was covered by the worst of both code.

Good luck

 

[unclesyd]

To save a lot of discussion and met up with an old friend, formula wise, check out this site. You can enter any number for Ultimate or Yield that you desire base on conditions.

http://www.engineersedge.com/pipe_bust_calc.htm

 

[handee]

Great site, Unclesyd, but one of the parameters is "material strength" in psi....where might that come from?

Fran McConville

 

[quark]

Check under Transport and Storage of Fluids in Perrys