ASME VIII div 1-U-stamp and Super Duplex S32760 material

[EuroWeld]

Hello all,

Recently we booked an order for fabricating a super duplex heat exchanger.
Design code ASME VIII div 1 including U-stamp.

During the procurement stage we are facing some difficulties buying the correct S32750-F53 seamless tubes.
The only option we have at this moment is an alternative in grade S32760-F55.
We searched the whole european (customer requirement) without any success.

We noticed that the ASME VIII div 1 does not include this super duplex grade S32760. Bacause of this reason it is not allowed for use in U-stamped designs.

Can somebody inform me why this grade S32760 is not included in the ASME VIII div 1? Seamless tubes are according to SA-789.
Both grades are included in ASME II Part A. Is this strange or unusual?

This alternative grade has a slighty lower tensile strenght and the chemical composition is somewhat different.
Looks like minor differences between apparently almost similar materials. After doing some investigation on the internet I have notices some preferences in different service conditions. All additional testing that we specify can be achieved by the tube supplier.

Our client is willing to accept this alternative grade but how about the code?
Are there some other manners to get this material accepted by the code? Does somebody have other suggestions that will help?

Thanks in advance,

Euroweld

 

[marty007]

Euroweld

A little bit of searching came up with this reference from Rolled Alloys: Link

"
Design Stresses – Pressure Vessels (ASME)
ZERON 100 (UNS S32760) is covered for ASME Section VIII, Division 1 construction by code case 2245 and in Section III, Division 1 by Case N-564-2. It is also included in B16.5 (Pipe Flanges and Flanged Fittings), B16.34 (Valves - Flanged, Threaded, and Welding End), 16.47 (Large Diameter Steel Flanges: NPS 26 through NPS 60), B31.3 (process Piping).
"

I don't have access to this code case at the moment to see exactly what is covered, but you may have to go that route.

Cheers,
Marty

 

[EuroWeld]

Hello Marty,

I kindly thank you for your help, this will help us to proceed with this alternative.
I checked this CC2245 and it includes the use of this material up to 600 F.
In our case this is enough.

Thanks allot,

Euroweld

 

[marty007]

You're welcome,

With any luck, this code case will be incorporated into the new 2013 version of ASME and everyone's life will be easier.

Cheers,
Marty

 

[metengr]

You better make sure that this is acceptable to the client and if the vessel is being installed in a Jurisdiction that regulates vessels because some Jurisdictions or regulatory bodies do not permit Code Cases for new construction.

 

[GenB]

I believe if it will be in the 2013 Code you will be OK to fully comply by July first. Get your new Codes.

 

[metengr]

This code case has not yet been incorporated for the 2013 Edition.

 

[EuroWeld]

Marty007,

Thank you for your effort. We discussed this CC with our client and AAI, both agreed to proceed with this alternative grade.

Just for interest: Why does it take so long to incorporate this CC from 1999?

Euroweld

 

[GenB]

Take so long!!!
we are lucky CC'es are incorporated now.. use to expire... that is your answer.