Dear All Members,

I have one nozzle(Long Weld Neck Flange) attached to the head using PV software. the result calculation for this flange are passed but after I consider some external load(like WRC 107&WRC 297),this calculation will failure.

So, could i used additional reinforcemnt pad for Long Weld Neck Flange?

Any prohibition on ASME Code?

Thank you.

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Faizol
(PV-elite User)

I'm afraid it's not a permitted joining techinque in UW-27 or UB-1

But go ahead, it's not forbidden to do something that is not required in the BPVC, as long as it doesn't violate anything else. On the other hand, you are required to consider nozzle loadings anyway (UW-22), the thing is it's not provided for in SecVIII-1.

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Konrad Anikiel

No prohibition from the code for RF pad on LWN nozzle but before going for a reinforcement pad just for external loads, it would be preferred to check whether external loads (assume piping loads) can be reduced in order to avoid reinforcement pad.

Any way what is the nozzle size and thickness/ dia of the shell/ dish??

Regards

Dear Mr.Sanjeev,

Sir, the size of nozzle is DN 100 and the thickness of head is 9.53mm thick(Nom) and after forming the thickness is around 6mm thick. Before this i used weld neck flange with reinforcement back, but after re-check at the site, length of this nozzle shall be reduce and weld to weld are clashed. so i used Long Weld Neck Flange.

Thank you.

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Faizol
(PV-elite User)

Generally piping loads are always a problem with the equipment having less thickness (generally less than 10/ 12 mm).

Speak to your piping group if they can reduce piping loads on the nozzle. Check actual thickness of head after forming where nozzle is located and use it in your calculation (6 mm may only be in knuckle portion- Thinning appears to be very high, appx 35%??).

If nothing works, provide pad.

Regards