×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Vessel Design for -95¦C Temperature

Vessel Design for -95¦C Temperature

Vessel Design for -95¦C Temperature

(OP)
If I would like to avoid impact test of the vessel with MDMT = -95°C by using SA-516 Gr 70 material. What is the minimum wall thickness of the vessel to order to meet ASME code? The design pressure is only 50 kPa. Thanks for your help.

RE: Vessel Design for -95¦C Temperature

I'm not gonna do it....

RE: Vessel Design for -95¦C Temperature

Quote:

If I would like to avoid impact test of the vessel with MDMT = -95°C by using SA-516 Gr 70 material.

Why????? I would suggest you review ASME B&PV Code, Section VIII,  Div 1.  

RE: Vessel Design for -95¦C Temperature

You might want to look at the cost difference between impact testing and switching to a stainless material that you can get an exemption on.  Even though you are at a very low pressure that cold material can be dangerous and probably warrants testing or an alloy change.

Regards
StoneCold

RE: Vessel Design for -95¦C Temperature

SA-516-70 is incapable of meeting Code mandated impact testing at -95 C. You should use 3 1/2% Ni alloy steel.

Thickness is based on pressure and diameter (and temperature); you've only provided pressure.

RE: Vessel Design for -95¦C Temperature

(OP)
Thanks stanweld,

The diameter is 20"ID.  I've read ASME B&PV Code Section 8 Div 2, it indicates that I can reduce the MDMT to -104°C, as long as the stress ratio is below 0.24 (3.11.2.5).  There are 3 equations to calculate stress ratio, which one I should use?

RE: Vessel Design for -95¦C Temperature

At the risk of being blunt, I think you need to pay a welding engineer who knows his way around the Code for a couple of hours of consulting.  This forum can be very helpful, but it is not the ideal way to design a PV.   

RE: Vessel Design for -95¦C Temperature

CS at -95°C..!!! Not a good idea i guess. can u tell me where u gonna use it??  

RE: Vessel Design for -95¦C Temperature

i dont think Sa-516 is suitable -95°C temp. better use stainless....

RE: Vessel Design for -95¦C Temperature

magicking,
You must qualify your welding procedures with impact testing at -95 C in weld metal and the HAZ of the SA-516-70 material. While you can select a weld filler metal that will meet the impact test requirements at -95 C, the HAZ is incapable of meeting the Code mandated absorbed energy requirements.  

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!


Resources