CAN SA-36 be used for a U-Stamped Vessel (ASME Section VIII Div 1) 1

[alvi787]

We have got a reboiler with Molten Salt as a Heat Tranfer Media. The Reboiler will be used to heat the condensate containing coil and heating is done by the flu gases in another coil. The molten salt will be filled in the shell section. The reboiler will be fabricated as per ASME Section VIII and will be U-Stamped also. Now the vendor is insisting to use SA-36 for the Shell and is stating that since there will be no pressure in the Shell Section of the Reboiler since it will be used to store the heating media, therefore SA-36 can be used but our datasheet is saying that SA-516 Gr. 70 Normalized (Nace compliant material) to be used.The temperature of the reboiler will be 215 degree C.

The service is sour and the client has stated that all the materials must be NACE compliant. My question here is that can we use SA-36 for such kind of service and conditions or not (need code reference)?

 

[SnTMan]

alvi787, not recommending it, but SA-36 can be used with some restrictions. See UCS-6(b).

Not permitted for lethal service, unfired steam boilers, or welded shells over 5/8" thick.

Don't know if it can be had NACE compliant but tend to doubt it.

Regards,

Mike

 

[SnTMan]

Might add that if you clearly specified SA-516-70 your vendor has no excuse to substitute.

 

[alvi787]

Thanks for your reply SnTMan. I need reference from the code. Can you please provide me one. Thanks and Regards

Obaid

 

[SnTMan]

UCS-6(b)

 

[GenB]

A36 normalized can be used in your service, your only limitation here is the customer's requirement. Be sure you get and approve MTRs beforehand. Buy specifying A516 material, your customer is willing to pay the extra 10cnts per lb of plate material and for a better quality end product.

 

[Duwe6]

You do not have to accept a Code-compliant vessel if it plainly fails to meet a contract specification. If 516-70 was incorporated in the contract, you have grounds for refusal to "accept &/or pay", or to demand a significant reduction in price due to "willful failure to meet".

 

[jte]

our datasheet is saying that SA-516 Gr. 70 Normalized (Nace compliant material) to be used

The service is sour and the client has stated that all the materials must be NACE compliant

Please tell me that my company is not your client! Seriously, since when does a fabricator dictate to a client (and I'll presume that you are with an engineering firm acting on behalf of the user, your client) what material a given piece of equipment is fabricated of?

Did the fabricator simply choose to not read the request for quotation which included this requirement? Or did they read it and are now willfully ignoring it? Either way, Duwe's response above is spot-on.

Or... Did you fail to include this little detail about SA-516-70N in your RFQ and are now looking to put the blame on the fabricator?


Something went seriously wrong in the procurement process here. It is just not entirely clear where. For now this is a commercial issue. Once in operation, people are put at risk if inadequate materials are used. I'll urge you to do the right thing.