Additional external loads on an existing pipeline

Over an existing gas pipeline, a temporary road will be constructed. As a result, the soil cover on this pipeline will increase and settlements of the subsoil is expected. The owner of the gas pipeline wants to be sure that this pipeline will be able to withstand these extra loads and stays fit for purpose.

A model of the pipeline, the soil and the pipeline loading was made. Key features of this project are:

  • Pipe dimensions (D x t): 203.2 mm x 5.56 mm and 203.2 mm x 6.3 mm.
  • Pipe material: L240 NB/MB steel.
  • Important loads: internal pressure: 40 barg, temperature range: from -20°C up to 50°C, soil settlement: 70 mm.
Additional load on existing pipeline

Temporary road over an existing pipeline (at the S-shaped part).
Ground and water level are shown in red and blue, the original and displaced pipeline are shown translucent and gray.

 

Analyses show the pipeline will stay within acceptable limits according to Dutch Pipeline regulations (NEN 3650).


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