API 1102: Doubt on Longitudinal stress calculation
API 1102: Doubt on Longitudinal stress calculation
(OP)
I make reference to API 1102 "Steel Pipelines Crossing Railroads and Highways" 6th Edition, April 1993, Appendix B, Uncased design examples, B.1 Highway crossing design.
Under Design information, data for Installation Temperature, T1, Maximum or minimum operating temperature, T2, and the Temperature derating factor, T are not available.
Then, on step g, point 2.2, Equation 10, which is a function of (T2-T1), result for calculation of longitudinal stress is 9,486 psi.
If T2 and T1 are not available, for me it is clear that the difference (T2-T1) is not available. For that reason, I cannot find the way for obtaining that figure of 9,486 psi.
I would appreciate having an explanation for this calculation.
Under Design information, data for Installation Temperature, T1, Maximum or minimum operating temperature, T2, and the Temperature derating factor, T are not available.
Then, on step g, point 2.2, Equation 10, which is a function of (T2-T1), result for calculation of longitudinal stress is 9,486 psi.
If T2 and T1 are not available, for me it is clear that the difference (T2-T1) is not available. For that reason, I cannot find the way for obtaining that figure of 9,486 psi.
I would appreciate having an explanation for this calculation.





RE: API 1102: Doubt on Longitudinal stress calculation
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RE: API 1102: Doubt on Longitudinal stress calculation
300F = 0.967
350F = 0.933
400F = 0.900
450F = 0.867
Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website: www.oil-gas-consulting.com
RE: API 1102: Doubt on Longitudinal stress calculation
Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website: www.oil-gas-consulting.com