Pipe for negative temperatures

[dianad]

Hi,

I need to select a pipe to work at -30 ºC and 20 bar, and i'm inclined to select a stainless steel, but i can't find a data sheet to select it. The ideal thing is to find some data sheet that follos ASME Code.

So does anyone knows any data sheet to select the pipe material and thickness, for this conditions, and the ASME code to be applied for this conditions?

Thank you soo much!

 

[MJCronin]

dia....

Piping Engineering is simply not a matter of "finding a datasheet that will permit something"

Piping systems are most often designed by competent engineers in an integrated manner, with specific concern expressed for:

- Material selection at extreme conditions

- Pressure design of all components at design pressures

- Flange and valve ratings

- Evaluation of expansion, contraction, overall flexibility and support systems

- Vibration, deadload and transient loadings

Have you ever been involved with piping design and engineering before ?

-MJC

 

[JohnBreen]

Material data sheets provide basic information about materials (they do not "follow" any Codes). The ASME Codes provide rules for the use of materials.

Why did you post here before you “did your homework”?

It would be greatly appreciated if you would at least make an effort to find an answer to such a fundamental question before you post. Then, observe the protocol of discussion forum etiquette.

First, learn how to use the search function provided by the forum – it is likely that your question (like many “fundamental” questions) may have been asked before, several times . The discussion board search functions can provide many of the answers you are looking for without you having to look (shall we say) “naïve”.

Before you post, learn how to ask “good questions” of the discussion board community. And again, do your homework - try to find answers to your “good questions” using your own intelligence. Remember, to ask the community to “spoon-feed” you lesson on piping engineering is to insult the intelligence of the community. Learn how to frame a “good question” unambiguously – take the time to provide all the information in support of your “good question” (the better thought-out the question, the more response you will get). Visit the forums even when you do not have a question as there will be questions asked there that you may not have thought of.

http://www.tipmaster.com/includes/refinfo.cfm

 

[JohnBreen]

At the top of the page find the "window" to perform a "Google search". Type in the string "low temperature piping" (with no quotation marks)and click on "search". Reap the harvest.

 

[dianad]

Hi,

Thanks for the reply.

I'm somehow disapointed with all your answers. Maybe i failed, but my intention was to ask for help so that i didn't spend my entire afternoon of work to find this. In fact, i think that's why this kind of forums are made: SO THAT PEOPLE CAN SHARE INFORMATION! WHAT FOR SOME OF US ONE SUBJECT IS COMMON, DOESN'T MEAN THAT ALL NEED TO KNOW IT!

As you all know, Mechanical Engineering is made of several subjects. I already know much things that probably you don't know, so don't underestimate people's knowledge if you don't know them!

I do not know what wich ASME code deals with this temperatures. Is this condenable?

I think that sometimes people spend more time in competing to know who is the best than in helping eachother.

Thank you JohnBreen for your advise! (It was the only good one)

I don't want to make some kind of enemies, but next time, think better when you spend your time in giving this answers.

 

[stanweld]

dianad,
Your question was simply too broad. There are numerous materials that are ductile at your minimum design temperature. The appropriate one is based on other service conditions and overall cost.

If your service conditions support using carbon steel, you can select ASTM/ASME A-336 Grade 6. If not, you may have to choose another material; e.g., austenitic stainless, nickel base alloys, copper alloys, aluminum alloys, etc.

 

[LSThill]

dianad (Mechanical)

Please review your Piping Classification Specification
below is example form

http://www.pip.org

PN01SA0S03 - Piping Material Specification 1SA0S03 Class 150, 304/304L Stainless Steel, 0.000" C.A. Low Temperature Process
Paper Copy Price $50
Date: 12-05 (Complete Revision)

PN01SA0S04 - Piping Material Specification 1SA0S04 Class 150, 304/304L Stainless Steel, 0.000" C.A. Cryogenic Process
Paper Copy Price $50
Date: 09-00

Leonard Stephen Thill

 

[dianad]

Thanks stanweld and LSTgill,

In fact i've taken a look already to ASME B31.3 after the last reply and advice by JohnBreen.
I founded that 304L(Class 300) or 316L (Class 300) fit to my conditions.
The problem of the 150 Classes mentioned by LSThill, is that they only support design pressures until aprox. 15 bar.

thank you both anyway!

 

[JohnBreen]

Dianad,

I apologize for my "rant". I have listed several publications that will help direct you toward information regarding piping design at:

thread378-189629

Look at the listed publications and you will find that some are available at no cost. This one may be very useful to you:

A companion document for use with the B31.3 Code (also look around this same site for other useful guides)

http://engstandards.lanl.gov/engrman/6mech/pdfs/D20-AppA-ASME_B31.3-r1a.pdf

Regards, John.

 

[LSThill]

dianad (Mechanical):

below is 300 ClassL

PN03SA0S03 - Piping Material Specification 3SA0S03 Class 300, 304/304L Stainless Steel, 0.000" C.A. Low Temperature Process
Paper Copy Price $50
Date: 11-06 (Complete Revision)


PN03SA0S04 - Piping Material Specification 3SA0S04 Class 300, 304/304L Stainless Steel, 0.000" C.A. Cryogenic Process
Paper Copy Price $50
Date: 09-00 | 02-01 (Technical Correction)

Leonard Stephen Thill

 

[LSThill]

dianad (Mechanical)

Please learn how to spell not: LSTgill,

L. S. Thill
Leonard Stephen Thill

 

[dianad]

JohnBreen,

thanks for post. It was very helpful!
I have many many books regarding piping design, but i only use them when i have something to solve specificly, because my area is more thermodynamics...so...

LSThill,

Sorry for the mistake.
I already have the ASME specifications.
Thanks