Should a low-point drain be installed on liquefied hydrocarbon pipelines?
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Has anyone noticed that problems tend to occur at the lowest points of liquefied hydrocarbon pipelines? So, is it necessary to install drain valves at these lowest points?
It’s part of the design; I haven’t encountered any problems at the lower points yet
It is prone to rusting, and the pipe diameters at the lower sections are relatively small, making it susceptible to fracture accidents
How to carry out steam purging when there is no low-point drainage shutdown
Liquefied hydrocarbon pipelines cannot be purged with steam
After the previous major repair involving water filling, it was isolated from the outside world; steam was introduced directly. There were technical modifications and welding work carried out, and steam cleaning was more thorough than using nitrogen
Setting up local drainage is beneficial for the process treatment