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!

*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.

Jobs

NACE question

NACE question

(OP)
Hello Everyone,

i have a part that's per NACE MR0175 (2002) only , the customer is asking if this make it automatically per MR0103.
does MR0175 exceeds MR0103 or is it automatically dual certified?

RE: NACE question

Neither. MR0103 was created after MR0175 to better meet the needs of the refining industry. MR0175 is basically for upstream oil and gas production while MR0103 is the down stream refining. There are many differences, such as environmental restrictions on materials and guidelines on determining sour environments.

RE: NACE question

I believe there is a NACE paper outlining and comparing the two standards. Could be searched on NACE site.

RE: NACE question

(OP)
Thank you so much for the answer, however i saw this article http://www.valvemagazine.com/magazine/sections/mat... and it basically says if the casting didn't have weld repair then it's dual certified? because material and heat treatments requirements are the same on both, and MR0175 has a better hardness requirement. the only difference is the weld spec if there any?

RE: NACE question

There are similarities, such as heat treatment condition of carbon steels, but they are not automatically dual certified. That being said, they certainly can be dual. I have a feeling you haven't actually looked in either standard.

RE: NACE question

Both standards have moved on significantly since 2002, so which version of MR0103 does the client think that they can gain parity with? Use of the word "certified" is also pushing things a little since there is no such thing as certification for NACE.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

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

RE: NACE question

(OP)
The current version of NACE that the valve is compliant with is MR0175 (2002). the customer didn't specify what version of MR0103 he is interested in but i am assuming it would be the latest since it's a new refinery under construction.

i end up providing the answer to the customer as per david339933 first message above, because there are multiple materials in this valve including CS and SS and duplex and i don't know the specific heat treatment of each and whether if there was weld repair involved ( weld repair for casting porosity for example) in addition if i would have said yes then i would have to provide an official letter stating the valve is dual certified (complaint). i didn't want to do that unless im 100% confidant which would required alot of digging.

so i guess the short answer is always no unless the same material (Ni content requirement for example), same heat treat, same or better hardness.

RE: NACE question

Mous1747, there is no such thing as "NACE certified". The NACE MR0175 specification states that it is the end user's responsibility to determine the specific service environment (pressure, temp, and partial pressure of H2s, CO2, pH, amount of chlorides, and is liquid water present?) and use the guidelines provided in NACE MR0175 to determine what processes the fabricator must use to mitigate risk of cracking in that particular service environment.

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


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