May 2014

Special Report: Maintenance/Reliability

Evaluate piping for displacement-controlled loading

In a Canadian case study, new piping under construction suffered some settlement in the underground portion, as evidenced by soil movement and slight deflection of the above-ground section.

Tharakan, J., Suncor Energy Products; Anisuzzaman, M., Suncor Energy Inc.

In a Canadian case study, new piping under construction suffered some settlement in the underground portion, as evidenced by soil movement and slight deflection of the above-ground section of the piping. One of the flange joints on the line was broken to assess the amount of strain in the joint. The joint sprung open with a wide gap that was far in excess of acceptable flange alignment tolerances. This situation warranted an engineering assessment to evaluate the risk. The piping design details are as follows: Design code: Canadian Standards Association (CSA) Z662 Design pressure: 500 psig Design temperature: 140°F Original minimum design metal temperature (MDMT): –49

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