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Commentator

Join Date: Jun 2007
Posts: 72

Design Calculation Sheet

07/10/2007 9:52 AM

between my hand is a design calculation sheet for the flange / bolt / gasket tightening...etc.

in the design condition, it is stated that:

Code: ASME B&PV Code Section VIII-Div.2

Design Pressure PD = 13.9 Mpag

Design Temperature t = 90C

Corrsosion allowance = 3mm

Axial Force Equivalent Pressure = 0.001794 Mpa

Axial Force on Flange = 120 kgF

Bending Moment on Flange = 205000 kgm

Bending Moment Equivalent Pressure = 13.4085 Mpa

Final Equivalent Design Pressure P = 27.310293 Mpa

------------------------------------------

why is the Code "ASME B&PV Code Section VIII-Div.2" stated ?

Are these values mentioned up extracted from these codes or are they calculated by the supplier and submitted on a design calculation sheet ? Based on what are they calculated ? are there limitations for them ?

How did they get the Final Equivalent Design Pressure ? i couldnt find a relation between the other pressure and the final equivalent pressure. Like adding the other pressures and changing Mpag to MPa ....etc

can anyone advise ?

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Guru

Join Date: Jul 2007
Location: 30°30'N, 97°45'W, Elv: 597 ft.
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Good Answers: 10
#1

Re: Design Calculation Sheet

07/10/2007 12:51 PM

boiler and pressure vessel - thus b&pv.

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Commentator

Join Date: Jun 2007
Posts: 72
#2

Re: Design Calculation Sheet

07/11/2007 12:28 AM

???

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Commentator

Join Date: Apr 2007
Location: Mid Atlantic Region
Posts: 72
#3
In reply to #2

Re: Design Calculation Sheet

07/11/2007 11:17 AM

Wow!! Looking at this and some of your other posts it looks like you've really got a tiger by the tail.

What is your work background that has left you scrambling to make sense of these things?

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Commentator

Join Date: Jun 2007
Posts: 72
#4
In reply to #3

Re: Design Calculation Sheet

07/11/2007 12:40 PM

all questions are related so i thought maybe if somebody couldnt answer one he ll answer another thats why

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Guru
Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

Join Date: Feb 2007
Location: Cairo, Egypt
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#5

Re: Design Calculation Sheet

07/11/2007 1:08 PM

The ASME BPVC is not a totally design handbook, it states only the design formulas for loading conditions due to pressure and temp., and a lot of other loadings must be stated and verified by the designer/owner by using other handbooks or related means. Also the ASME BPVC states the factor of safety specially for the used material, and therefore defines the allowable stresses of that material at the specified temp.

Therefore, the values mentioned are calculated by the designer based on design formulas of ASME and by substituting for the design pressure, design temp., mechanical properties (allowable tensile strength, SMYS, ... etc.) of material at design temp. So, the designer/owner/consultant must specify the other loadings to be taken into consideration.

I recommend to take a look for ASME code and see how the calculations proceeded.

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Commentator

Join Date: May 2007
Posts: 70
Good Answers: 1
#6

Re: Design Calculation Sheet

07/15/2007 11:34 AM

The objective of your design parameters falls to the category of Boiler & Pressure Vessel Code. The design code is the ultimate data reference that you can obtain from the materials you will be use in fabrication or manufacturing.

When you design a large storage tanks for water or oil at atm pressure, you will not be using B&PV Code.

Same as when you design Heat Exchanger Equipment you will be using TEMA Code.

Regards

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