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Pressure rating for Stainless Steel 316 ANSI flange at 250F

asked Sep 23, 2014 in Piping by belmoreno (2,190 points)

I am working on the Methanol Injection Pump data and would like to check with the expert on the design pressure and temperature, as well as the material.

Design conditions:

  • Material 316 SS
  • Design Pressure: 4650 psig
  • Design temperature: 2250F
  • Discharge flange rating 2500#

Do I have to use the extrapolation calculation to estimate the MAWP for use in this case using the Pressure Temperature Ratings for Stainless Steel 316 ANSI Flanges Table?

1 Answer

+1 vote
answered Sep 23, 2014 by Tadd Pham (5,620 points)

Yes, extrapolating is needed in this case to determine your actual allowable pressure.

From the Standard Pipe Code Table:

Class, Temp 0F Working Pressure, by Class, psig
200 5160
225 X
300 4660

(225-200)/(300-200) = (X-5160)/(4660-5160)

X = 4785 psig is the Maximum Pressure Rating for 316SS at 2250F.

So that would satisfy your required designed condition.

Hope that helps.

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