Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Pipe Requirements for Pressure

Pipe Requirements for Pressure

Pipe Requirements for Pressure

Hi all,

I am a new engineer working in the vacuum industry.  The company I work for has only manufactured crosses, tees, flanges for the vacuum side but we are thinking about crossing over to the pressure side. I have come to realize that there are certain types of piping/tubing required to be used (extruded seamless) and some that are not allowed (structural, porthole, bridged).....is there a list available that shows the pressure-allowable type of piping/tubing?

Furthermore....any tips on where to start on the quest of becoming ASME certified? I've already gotten some info from asme.org but want to present as much info to those in charge about what it'll take.


RE: Pipe Requirements for Pressure

For Vacuum design, look in the ASMS B&PV Code, Sec. VIII, Div 1, par. UG-28.  Materials are in Sec. IID. Your local engrg college should have a set of codebooks in the reference section.

Contact the National Board http://www.nationalboard.org/ or your industrial insurance company to find out about getting a code stamp.
also try: Factory Mutual: http://www.fmglobal.com/irt/BnM.html
or Hartford Steam Boiler:

RE: Pipe Requirements for Pressure


It sounds like the answers to the questions that you are asking are contained in the ASME piping codes....B31.1 and B31.3

Within these codes are listings of ANSI and other "dimensional standards" that define acceptable shapes, sizes and piping fittings. Also contained within these codes are methods to calculate acceptable wall thickness of piping for a given pressure and temperature. Your comments about extruded and seamless materials are also addressed there.

If you produce components for vacuum serice and are now thinking of pressure components, I do not understand the thought process and the commercial motivation. Many, many companies produce piping and piping fittings for pressurized service. What unique product or service will you be offering ?

Hope that this helps....


RE: Pipe Requirements for Pressure


Thanks for the reply. I'm slowly learning about the ASME code and where to find various information for my project.  I've recommended to the powers-that-be to purchase the ASME code volumes.

I'm not too sure about my company's commercial motivation but I do know that we are constantly asked by customers whether our fittings are designed for pressure applications.  Up until now we've not guaranteed that they are pressure-capable (as we're not ASME certified). However, if a customer is building a system and using our products on the vacuum side of their pump, it might make their lives easier if they can also purchase parts for the pressure side of their pump direct from us too.  


RE: Pipe Requirements for Pressure

I've frequently been in the other side of the situation you describe, I need piping to test to over 600 psig, but there are phases where it will see a significant vacuum (usually for a short period).  I have had a hard time getting any pressure-fitting manufacturer's to discuss their fitting's rating under vacuum.  I think you may be on to something to approach it from the vacuum side.

David Simpson, PE
MuleShoe Engineering

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close