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inspectorjoe
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Join Date: Apr 2008
Posts: 50

Nozzle Neck Thicknesss

05/02/2008 4:56 AM

We are currently doin a pressure vessel evaluation. How do i compute if the nozzle thickness are still acceptable? I have now the ut readings of the nozles. Is there a formula for computing the minimum allowable thickness?
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Abdel Halim Galala
Guru
Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

Join Date: Feb 2007
Location: Cairo, Egypt
Posts: 1733
Good Answers: 248
#1

Re: Nozzle Neck Thicknesss

05/03/2008 4:33 AM

Min. required nozzle wall thickness, trn = PRn/(Sn En - 0.6P) ....... ASME Code, Section VIII, Div. 1 (UG-27)

where P = Design Pressure

Rn = Nozzle Inside Radius in corroded condition

Sn = Allowable Tensile Strength of Pipe Material

En = Joint Efficiency

Please refer to UG-16(d) and (e), UG-27, UG-37 and UG-45.

Or you can use the equation : trn = PRon /(SnEn + 0.4 P) ......(Appendix 1.1)

where Ron = Nozzle Outside Radious

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inspectorjoe
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Join Date: Apr 2008
Posts: 50
#2
In reply to #1

Re: Nozzle Neck Thicknesss

07/28/2008 1:09 AM

How do i compute for the minimum allowable thickness of a boiler tube sheet?
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