Nozzle Extension Inwards
Nozzle Extension Inwards
(OP)
I am looking to add a diffuser to an existing flush type 10" receival nozzle. Is it ok to just go ahead and weld that diffuser pipe onto the internal portion of that flush type nozzle of the storage tank?
Stored product: Crude
Tank Type: External Floater ( 174' Dia, 48' Height)
Stored product: Crude
Tank Type: External Floater ( 174' Dia, 48' Height)





RE: Nozzle Extension Inwards
However, I would point out that larger tanks commonly have nozzles inserted into shell plates and stress-relieved prior to assembly, in which case, it'd be undesirable to weld it that way.
RE: Nozzle Extension Inwards
RE: Nozzle Extension Inwards
RE: Nozzle Extension Inwards
If the shell is A36, and shell plate is 1" or less, no problem.
If the shell is A36 and over 1", or if it's A516-70, A573-70, etc., then see 5.7.4.3. In that case, see 5.5.4.2(a) in API-650, which specifies spacing to the non-stress-relieved weld. And see 9.8.3 in API-653.
RE: Nozzle Extension Inwards