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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