Maximum Length for LWN
Maximum Length for LWN
(OP)
Hello All,
Could someone confirm me if there is a maximum length for long weld necks?
The client is asking for a vessel in cyclic service to provide self-reinforced nozzles for those bigger than 2" and LWN nozzles for 2" and less. (Something quite usual).
The problem is this vessel will have 200mm of insulation, so minimum projection for 2" nozzles needs to be something like 300mm from vessel ouside wall.
I think this is not possible using LWN nozzles, as the maximum length for these is 228mm. Can someone please confirm?
If actually no LWN nozzles can be used, is it possible to use a WN self-reinforced nozzle of 2"?
Thank you very much in advance!
Could someone confirm me if there is a maximum length for long weld necks?
The client is asking for a vessel in cyclic service to provide self-reinforced nozzles for those bigger than 2" and LWN nozzles for 2" and less. (Something quite usual).
The problem is this vessel will have 200mm of insulation, so minimum projection for 2" nozzles needs to be something like 300mm from vessel ouside wall.
I think this is not possible using LWN nozzles, as the maximum length for these is 228mm. Can someone please confirm?
If actually no LWN nozzles can be used, is it possible to use a WN self-reinforced nozzle of 2"?
Thank you very much in advance!





RE: Maximum Length for LWN
If that is the case, you could opt for self-reinforced nozzle eg H-neck etc.
yl0525
RE: Maximum Length for LWN
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RE: Maximum Length for LWN
If we are forced to use one longer....we buy two short ones and weld together.
RE: Maximum Length for LWN
RE: Maximum Length for LWN
RE: Maximum Length for LWN
9" and 12", as DG72 is saying, I think are most common lengths.
Our LWN are stainless steel (SA-182 Gr. F304L) and they need to be LWN or self reinforced WN, as the vessel is in cyclic service.
Do you consider if the vendor considers difficult to find (or the client considers expensive...) LWN with a length of aproximately 14" the using of self reinforced WN nozzles of 2" is ok for this service?
I think it should be completely ok.
RE: Maximum Length for LWN
2" nozzles are likely to be exempt from any reinforcement calculations.
If not, if they can be made to "make" w/o pad, they are "self reinforcing" a term I find somewhat ambiguous.
However, if the client requires LWN, the client requires LWN.
Regards,
Mike
RE: Maximum Length for LWN
Regards,
Mike