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#33393 - 02/25/10 11:29 PM WRC calculation for nozzle on INSERT plate
Bipin Offline
Member

Registered: 02/25/10
Posts: 13
Loc: India
We are designing the equipment where the internal pressure is high. For very high nozzle size (more than 36") the Shell to nozzle junction fails in WRC 107.
So can we use the option of increasing the local thickness in Reinforcement calculation of WRC? I.e. whether insert plate thickness is considered in WRC caculation?
What is the definition of Local thickness?(Is it min 2 tomes nozzle dia of Sqrt RT).

Please revert.


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#33405 - 02/26/10 09:26 AM Re: WRC calculation for nozzle on INSERT plate [Re: Bipin]
Mandeep Singh Offline

Member

Registered: 12/15/99
Posts: 600
Loc: Houston, Tx, USA
PV Elite should consider the local shell thickness (specified on the nozzle dialog), in the WRC 1-07 calculations.

But, make sure that local shell thickness covers the region of high stress around the opening. This is a recommendation from WRC-368 which can be considered as rule of thumb to give conservative solution,

If the width of shell reinforcement (pad plate or insert plate) is at least as wide as greater of 1.65*Sqrt(R*T) and d/2, then it should be considered in the WRC analysis.

where R and T are mean radius and thickness of the parent shell/head.

d is nozzle mean diameter

_________________________
Best Regards,
Mandeep Singh
CADWorx & Analysis Solutions
Hexagon PPM

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#35784 - 05/31/10 03:02 AM Re: WRC calculation for nozzle on INSERT plate [Re: Mandeep Singh]
Bipin Offline
Member

Registered: 02/25/10
Posts: 13
Loc: India
Dear Mr. singh,

Please clarify the requirement of RF pad width (greater of 1.65*Sqrt(R*T) and d/2)to consider the pad thk in local shell thk..
Do you mean to say a 250NB nozzle on 4m dia x 20Thk shell require 1.65 x sqrt(2010 x 20)=330.8 mm width. i.e. the pad dia required is
934 mm to consider the local shell thickness as pad thk + shell thk.

Please revert.

Regards,
Bipin Balpatki

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