Pipeline wall thickness/design pressure formulation GIE study, SUPERB Project and ASME codes comparison
- Gulf Interstate Engineering Co., Houston, TX (United States)
Design criteria and equations for determining the line pipe wall thickness has been, in the past several years, one of the most important issues with oil and gas transportation companies. Published results of the experimental and analytical studies and safety records of the pipeline operating companies indicate that the present traditional design formulation is conservative and may be revised to reduce pipeline wall thickness safely. The SUPERB Project was initiated in 1991 and supported by ten major oil and gas companies. A recently published guideline contains some recommended design equations for wall thickness determination with a new value of safety (usage) factor using structural reliability and based on calibration methodology. The goal of Gulf Interstate Engineering`s (GIE) study is to develop an accurate, sound analytical solution for determination of the hoop stress due to internal pressure, considering distribution of the radial stresses across the wall and nonlinear property of pipe material. For design purposes the authors used an elastic, linearly hardening stress-strain diagram, which for this case, was more conservative than an actual stress-strain diagram. This paper compares reduction of nominal wall thickness using GIE and SUPERB methods to ASME codes for the pipe with the various diameter-to-wall thickness ratios and underthickness tolerances. The comparison shows that results obtained with two different methods are in good coincidence. Therefore, traditional stress analyses based on performing more accurate calculation considering stress distribution across the wall, nonlinear property of steel, principal, methodology and existing codes design factors may safely reduce the required pipe wall thickness and may be used in the engineering design.
- OSTI ID:
- 460696
- Report Number(s):
- CONF-970146-; ISBN 1-890277-01-0; TRN: IM9718%%278
- Resource Relation:
- Conference: Energy week `97 conference & exhibition, Houston, TX (United States), 28-30 Jan 1997; Other Information: PBD: 1997; Related Information: Is Part Of 8. annual international energy week conference and exhibition: Conference papers. Book 2: Pipelines, terminals and storage; Processing and refining; PB: 284 p.
- Country of Publication:
- United States
- Language:
- English
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