Page 57 - Pipelines and Risers

30 Chupfer 2

Pb = 09O(SMYS + SMTS - (2. lo)
(D'r)

where:
D = Outside diameter of pipe
SMYS = Specified Minimum Yield Strength of pipe.
(See API Specification 5L, ASME B31.4, or ASME B31.8 as appropriate)
t = Nominal wall thickness of pipe
SMTS = Specified Minimum Tensile Strength of pipe
Note: The formula for the burst pressure are for Db15.

Substituting the pressure test pressure into Eq. (2.8) the maximum design burst pressure:
'd 'o.80fdfeftpb (2.11)

Substituting the burst pressure Ph into Q. (2.1 1), the maximum design burst pressure is:
Pd IO.80 fd f,f, 0.90(SMYS + SMTS -
[;-ti
Longitudinal Load Design
The effective tension due to static primary longitudinal loads shall not exceed the value given
by:
Tefi I 0.6OTy (2.12)

where:
T@ = To -CA, -I- PoAo
T, =o,A
T, = SMYS . A

7r
A = A. -Ai = -(D'. - D2i)
4
A = Cross sectional area of pipe steel
4 = Internal cross sectional area of the pipe

= External cross sectional area of the pipe
'0
4 = Internal pressure in the pipe

= External hydrostatic pressure
SMYS = Specified Minimum Yield Stress