×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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

NPT size for 7500 psi??

NPT size for 7500 psi??

NPT size for 7500 psi??

(OP)
I need a larger NPT hole than 1/2" for a 7500 psi.  We have been testing at 4500 psi with a 2" NPT (fill with water).  But now we are testing at 7500 psi.  I know API says 1/2 NPT for 10,000 psi, but is there any other spec I can use for a larger NPT at 7500 psi???

RE: NPT size for 7500 psi??

Quick question, is the 2" NPT/LP part of the equipment being tested or part of the test equipment? If the working pressure of the 2 NPT is under 5000 you can test to 10000 but if it's part of your testing equipment your working pressure is 7500 and you're above the recommended working pressure.

RE: NPT size for 7500 psi??

(OP)
No its part of the Test Equipment.  It sees a direct pressure of 7500 psi

RE: NPT size for 7500 psi??

Your test equipment isn't covered by API. If the volume is small enough it isn't covered by ASME either so all you're subjected to is best practise. Do some calcs to see if the configuration can be rated to 7500 with a reasonable safety factor. Of course your biggest problem might be preventing the connection from weeping and messing up your tests.

RE: NPT size for 7500 psi??

Team Members

HIGH PRESSURE TUBLING SYSTEM, 10,000 PSI - AUTOCLAVE ENGINEERS

9/16 Tube AUTOCLAVE MEADIUM PRESSURE TUBING CATALOG NUMBER MS15-097-2005.

Leonard@thill.biz
www.thill.biz

RE: NPT size for 7500 psi??

(OP)
Yah I knew about Autoclave, I was trying to stay away from them due to price, this is a cheap fixture, 36" dia flange

RE: NPT size for 7500 psi??

Hi All,

There is a report available on Awhem website for gas testing of 2" LP thread which held up to 12.7 ksi. Awhem had proposed some changes to API 6A which would allow 1/2" - 4" LP connection to 10K WP. I think API had opted for acme thread instead but nevertheless the report is valid. Only thing is that the material need to be min. 60K yield.

mike



http://www.awhem.org/PDFs/tp9801.pdf

RE: NPT size for 7500 psi??

(OP)
Yes, I also found the AWHEM API 6A proposed spec.  One of our (my company's) engineering managers was actually on the board.  However, we have decided to use the 1/2" NPT and just use an air hose to blow all the remaining testing fluid out through another NPT port.  Thanks for your help.

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


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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