reducer nozzle

[anolan23]

Instead of a straight pipe as a nozzle, could a concentric reducer be used as a nozzle? If yes, when performing nozzle thickness requirements of UG-45, which diameter would be used? HELP IS HIGHLY APPRECIATED

 

[SnTMan]

anolan23, 1), yes, although it might be necessary to restrict the limit of reinforcement along the nozzle axis, depending on dimensions.

2) Ask yourself, "If I base UG-45 thickness on the small diameter, and the large diameter doesn't make, what do I do?" I'd think the answer would be obvious

Regards,

Mike

 

[anolan23]

Thanks for your input!

Luckily I am exempt from reinforcement UG-36(c)(3).

I would base it off the larger diameter one because I know that a smaller diameter pipe is stronger

 

[anolan23]

Do you know if the reducer needs to have one of the standards as listed in UG-44?

 

[SnTMan]

Simplify things alot if it did.

 

[Afox88]

I would suggest putting a straight pipe section before the reducer. So shell -> pipe -> reducer -> weld neck flange (or straight pipe and slip on). It makes things easier for the welding. I am not 100% positive that you can weld a reducer straight to the shell, but sntman didn't bring it up so I am assuming code doesn't have an issue. Even so, I am assuming the nozzle is quite small, since it is exempt from UG-36 reinforcement calcs, so the extra cost for a small straight section should be minimal.