Composite Material for Vessels
Composite Material for Vessels
(OP)
Can we build a pressure vessel from SA240 TP 316L material with Duplex SS (UNS S31803) nozzles? If yes, what important things do we have to take into consideration while carrying out the design calculations? Also what electrode we can use for the welding of this composite vessel. Is there anything important that we have to consider for the fabrication of this vessel?
Regards,
PEHasan
Regards,
PEHasan





RE: Composite Material for Vessels
Yes, you can design the austenitic vessel fitted with Duplex nozzle, as the welding is not a difficult operation (assuming a proper welding procedure). The nozzle reinforcement calculations however, cannot take in account the higher allowable design stresses for the Duplex material.
The low heat input during welding is critical ( less than 1 J/mm) for hardness control and carbide precipitation control, since the PWHT is not recommended.
gr2vessel
RE: Composite Material for Vessels
Regards,
Mike
RE: Composite Material for Vessels
As for filler, what does the mill making the duplex recommend? You could go either way, austenitic or duplex filler.
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RE: Composite Material for Vessels
Please include in your advice to PEHasan, any reference which recommends impact test on the Duplex stainless steel material or its welding / HAZ.
Cheers,
gr2vessel
RE: Composite Material for Vessels
Requirements for impact testing weld and HAZ are fairly involved and depend on the filler metal used, but are found in UHA-51 (b). Requirements for production testing are found in UHA-51 (f).
Hope this is useful,
Mike
RE: Composite Material for Vessels
I am curious....
Is this a new vessel ? If so, why do you want just the nozzles to be constructed from a duplex material ?
I cannot imagine a process chemical service that would require this unique configuration...
-MJC