API 653 Refresher Course
CASE STUDY FOR ASME B31.3 COURSE
TEASER 1: Design of Pipes for Internal Pressure
(Question)
Choose correct pipe schedule for a piping with the following design conditions:
Design Pressure = 400 psig
Design Temperature = 750 degrees F
M. O. C. = 8” ND pipes, A 106 gr. B seamless
Corrosion Allowance = 3.0 mm
Assume standard mill tolerance.
Solution:
CASE STUDY FOR ASME B31.3 COURSE
TEASER 1: Design of Pipes for Internal Pressure
(Solution)
Design Pipe Thickness, t = PD/2 (SE + PY) + C
Here, P = 400 psig -------------------------- given
D= 8.625” (219.08 mm)------------- from pipe dimension tables
S= 13,000 psi------------------------- Table A-1 (Stress Table)
E= 1.0 -------------------------------- Table A-1B (Quality Factor Table)
Y= 0.4 -------------------------------- Table 304.1.1 (Y Table)
Now, t= 400 x 219.08 / 2 (13,000 x 1 + 400 x 0.4) + 3
= 3.329 + 3
= 6.329 mm
Allowing standard negative mill tolerance of – 12.5%
Nominal thickness (i.e. ordered thickness) = 6.329 / 0.875 = 7.23
Referring pipe tables again, choose 8” Sch. 40 pipe
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