×
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

Temperature Limit

Temperature Limit

Temperature Limit

(OP)
As per ISO 15156-3, for 316L SS pipe in sour service, is it correct that as per table A.2, the maximum temperature limit is only 149 deg C if we comply with pH2S, chloride, pH limits.
Thanks in advance.

RE: Temperature Limit

The limits stand individually. They cannot be relaxed if the other parameters are lower than their respective limits.

Also, remember that welds are not covered.

Steve Jones
Corrosion Management Consultant

www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

RE: Temperature Limit

And other forms of corrosion are not covered either.
It is up to you to address those as well.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: Temperature Limit

(OP)
Thanks Mr. Jones and EdStainless.
Your replies are not clear to me. Please elaborate. I was looking for yes / no type reply.
My pipe class shows 316L pipe used upto 250 deg C.
What is the maximum temp limit of 316L per ISO 15156-3.

RE: Temperature Limit

The 250C is strictly related to temperature and pressure.
Once you start adding any corrosion effects those will only reduce the maximum service temperature.
Looking at just pH and Cl you will run into pitting/cervice corrosion limits.
And then you need to consider the H2S related issues.
This is called engineering, the solving of problems.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: Temperature Limit

The piping engineers putting the piping class together have no clue about corrosion other than being told what corrosion allowance is required (in this case it should be zero). They work purely from mechanical and availability considerations. So, mechanically, the piping class might be able to go to 250 deg C, but from a corrosion point of view it could be inappropriate.

There are three ways to allow 250 deg C:

1. Absolute confidence in a maximum 50 ppm of chloride

2. Performing a suitable laboratory qualification test programme

3. The pipe is going into equipment that has already performed satisfactorily for a minimum of 2 years in the specific environment.

Good luck

Steve Jones
Corrosion Management Consultant

www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

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



News


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