Nozzle Schedule - PV Elite

[shady2554]

Hello all,
I am designing a closed drain drum using PV Elite.
Size: 75" ID and 18.67' S/S.
Design P is 125psig @120 deg F.
Mat'l is CS + 3mm.

My piping designer has done wall thickness calculation and selected SCH 40 for the pipes.
Using this schedule for my 4" nozzles fail in PV Elite.

Should I proceed to sch 80?
This is the only way I knew that my nozzles could pass, by increasing the sch.
I have tried reinforcement but it didn't work.
please advise.

Thanks for your anticipated response

"Let he that thinks he is standing beware that he does not fall".

 

[SnTMan]

shady2554. are you designing to any particular Code of construction? If so, are you familiar with the rules relevant to you class of work? Are you familiar enough with your software to understand in what way it is telling you the nozzle is failing?

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[shady2554]

Thank you SnTMan for your prompt response. As for your questions:
Yes am designing to ASME VIII Div 1.
Yes, I'm not an expert in the field, so to some extent I am familiar with the relevant rules, otherwise I wouldn't be here to ask questions.
Yes, I am familiar enough with my software, I have used it previously in a couple of projects.
So when I have a UG-45 Failed error [Minimum Nozzle neck thickness], I do understand that.
So please sir, I would appreciate your expertise in putting this ache to rest.

What can i do?



"Let he that thinks he is standing beware that he does not fall".

 

[SnTMan]

shady2554, UG-45 rules are relevant only to minimum required nozzle neck thickness. This thickness is determined by several conditions as per the rules. These rules are not concerned with opening reinforcement, limits thereof, weld details and sizes, end preparation or any other aspect of the nozzle.

So, if a nozzle is failing on UG-45 thickness, the only way to correct it is to increase the nozzle neck thickness.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

On Edit: Your piping designer is not bound by UG-45. The nozzle wall and attached piping wall are commonly mis-matched

 

[shady2554]

Thanks Mike.
Really appreciate.

"Let he that thinks he is standing beware that he does not fall".