×
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

RTJ Gasket Seating Surface/TEMA Standard

RTJ Gasket Seating Surface/TEMA Standard

RTJ Gasket Seating Surface/TEMA Standard

(OP)
The TEMA standard has provided for acceptable levels of discontinuities/marks in the Gasket seating surface.

Can this be extended to U stamp jobs?

Can this (TEMA) acceptance be extended to the seating surface of RTJ type flanges?

If there is a Visually shallow indication/As welded (Un machined) portion in the flat/Horizontal portion of a RTJ type flange but the taper portion is in machined condition(My understanding is that taper portion is the gasket seating area) but Hydrotest is clear (that is no leak is observed) and All required NDTs are clear, is there scope for AI to still object to this situation.

RE: RTJ Gasket Seating Surface/TEMA Standard

Review SecVIII Div1 U-2(e),UG-90(b)(13),(c)(1)(k),UG-95,UG-96. What does your in-house standard say about surface finish? Do you have a flange standard or spec.? The AI may be making sure you are following your own requirements. Can you write a "system non-conformance" and Eng.disposition it to "use as is"?

RE: RTJ Gasket Seating Surface/TEMA Standard

(OP)
Our internal procedure does not address this situation. We may have to upgrade it to meet this kind of situation. Our system procedure says gasket seating surface shall have  
surface finish as per the type of Gaskets and a Table of Surface finish is provided. Reference is Made to B 46.1 for measurement of Gasket seating surface finish.

As regards ASME clauses, it does not provide much teeth fo convincing AI.

Actually this is the full situation.

1) The flange is standard SA 182 F5/ANSI B 16.5/600 # flange, but the gasket seating and the inside surface were ouerlayed with 347. After the completion of welding the overlay all NDT conducted and cleared, the flange was welded to shell and  heat treatment was completed. Before Hydro a small porosity was noticed (in the horizontal portion of RTJ joints porosity size 1mm), although it could have been left as it is, our over enthusiastic QC wanted explore/fill it. When an attempt was made to rectify, it turned out to be sub surface (long) slag. Hence it was decided to grind and then fill the same rather than leaving it as it is. On completion it was found to be too conspicuous. Being a heavey Heat exchanger and this being a nozzle, Machining of RTJ would pose further risk  of Damage, hence went ahead with Hydro and found the hydro is clear.

Can we conclude that proof of Satisfactory gasket seating surface is passing the hydro.

Is the gasket seating surface of RTJ the taper portion or does it encompass the flat portion also.

Requesting for  some back up info.

Thankyou   

RE: RTJ Gasket Seating Surface/TEMA Standard

You must speak with the AI. Explain your reasoning.
If this is not acceptable refer to the NBIC for guidence
on a possible repair.

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