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rajasekar_be
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India - Member - Rajasekar

Join Date: May 2009
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Calculating Shell Thickness Under External Pressure

09/15/2009 5:52 AM

My Vessel D/t value is 430.845in and L/D value is 2.626in, Shell material is SA516 Gr70, so D/t>10.

I want to know the value of Factor A and B, My Design Temperature is 194F.

I have ASME Sec IID, Subpart-3, but how to get the values? I dont know, pls help me
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nick name
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#1

Re: Calculation of shell thickness under external pressure.

09/15/2009 8:01 AM

"D/t value is 430.845in and L/D value is 2.626in"

The ratio of two length is dimesionless and cannot be in "in"!!!
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rajasekar_be
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India - Member - Rajasekar

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Location: India
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#2
In reply to #1

Re: Calculation of shell thickness under external pressure.

09/15/2009 8:09 AM

yes correct, D/t = 430.845 and L/D = 2.626
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brkmech
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Location: UAE
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#3
In reply to #2

Re: Calculation of shell thickness under external pressure.

09/15/2009 1:19 PM

You need to go to FIG G of subpart of IID and from fig G using the value of L/D & D/t the value comes to 0.00006.Then you need to go to appropriate curve for your material i.e CS-2. From the curve the for value of A and temperature 194 F intersection lies on left of curve ,hence the value of B is not applicable for your case. In such case you need to see step 7 of UG 28(c) of ASME VIII Div1 .

Hope solved your problem

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rajasekar_be
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#4
In reply to #3

Re: Calculation of shell thickness under external pressure.

09/16/2009 3:16 AM

Thanks brkmech,
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