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Table 5 Stress-checking of the gas pipeline

From: Stress analysis of parallel oil and gas steel pipelines in inclined tunnels

Loading conditions

Representation in CAESAR II

Stress type

Maximum stress value (MPa)

Location

Average stress value (MPa)

Stress check value (MPa)

Operating case of gas pipeline

W + P1 + T1

Peak stress

362.21

Bend 2

285.57

551 × 0.9 = 495.90

Sustained case of gas pipeline

W + P1

Primary stress

245.39

Fixed pier 1

234.70

551 × 0.75 = 413.25

Expansion case of gas pipeline

T1

Secondary stress

169.58

Bend 2

107.36

551 × 0.72 = 396.72

Pigging case of gas pipeline

W + P1 + T1 + F1

Peak stress

362.71

Bend 2

285.57

551 × 0.9 = 495.90

Pressure test case of gas pipeline

WW + T3 + HP

Peak stress

378.45

Bend 3

358.03

551 × 0.9 = 495.90