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Discussion
and References
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Information about Wall
thickness calculation of straight pipes under internal pressure:
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ASME B31.8 Gas
Transmission and Distribution Piping Systems, para. 841.1.1
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Tables and Standards
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Table D-1 Specified Minimum Yield Strength
for Steel Pipe Commonly Used in Piping Systems
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Table 841.1.6-1 Basic Design Factors
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Table 841.1.6-2 Design Factors for Steel
Pipe Construction
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Table 841.1.7-1 Longitudinal Joint Factor,
E
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Table 841.1.8-1 Temperature Derating Factor,
T, for Steel Pipe
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ASME B36.10M-Welded and Seamless Wrought
Steel Pipe
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ASME B36.19M-Stainless Steel Pipe
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Equations
for Wall thickness calculation of straight pipes under internal pressure
(841.1.1):
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t =
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PD
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(U.S. Customary Units)
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2SFET
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t =
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PD
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(SI Units)
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2000SFET
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tn = t + CA
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Corrosion
allowance is not included in the parra. 841.1.1
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It is
optional to the designer its inclusion in the calculation.
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The
parameters in the wall thickness calculation of straight pipes under internal
pressure
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equations
above are:
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D = nominal
outside diameter of pipe, in. (mm)
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E = longitudinal
joint factor obtained from Table 841.1.7-1 [see also para. 817.1.3(d)]
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F = design factor obtained from
Table 841.1.6-1.
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P = design
pressure, psig (kPag) (see also para. 841.1.3)
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S = specified
minimum yield strength, psi (MPa), from appendix D
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T = temperature
derating factor obtained from Table 841.1.8-1
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CA = Sum. of
Allow. for Corrosion, in. (mm)
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t = nominal wall
thickness, in. (mm)
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