SPACER & BLIND Thickness Calculation for Internal Pressure (ASME B 31.3)

SPACER & BLIND Thickness Calculation for Internal Pressure (ASME B 31.3)

SPACER & BLIND  Thickness Calculation  for Internal Pressure (ASME B 31.3)

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Step1: Select the Spacer & Blind Material

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Step2: List Down

      Ø  Pipe Outside Diameter, (mm) = D

   Ø  Internal Design Pressure,(Kg/cm²) = P   

   Ø  Design Temperature, (C°) = T

For the material under consideration.

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Step 3: List down

Ø  Allowable Stress, (Kg/cm²)  = S

ASME B 31.3 @ Design Temperature.  (TABLE A-1)

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Step 4: Select

Ø  Joint Efficiency factor = E             (TABLE A-1A)

ASME B 31.3  (TABLE-1A)

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Step 5: Select

Ø  Corrosion Allowance, (mm) = c

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Step 6: Formula @ ASME B 31.3 

                                 3*P

tm   =    dg * √  (--------------)     +  c

                              16*S*E

tm= Calculated thickness including corrosion Allowance, (mm).

dg = Inside Dia. of gasket for RF/FF flanges or gasket pitch dia. for RTJ flanges, (mm).

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Step 7: Compare thickness

If      t > tm

t = Thickness as per API 590

Then selected thickness of Spacer & Blind is OK,

Else revise the thickness.

Custom Flanges Manufacturer

在 2013年4月13日星期六 UTC+8下午11:19:37，Yass3r写道：

Dear Experts,

I am need of your help , i have got blind flange fabricated from plate selection chart from this forum but difficult to prove to client can you please give me code reference or derived formula.

Your Earliest Response is highly appreciated.

Thanks and Regards,

Yasir

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