I would like to ask the experts: how is the difference between interplant pipelines and long-distance pipelines defined? Is it just a matter of length?
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I would like to ask the experts: how is the difference between interplant pipelines and long-distance pipelines defined? Is it just a matter of length? There is a hydrogen pipeline that runs from a petrochemical plant to an iron and steel factory, with a length of approximately 25 km. Should this be considered an interplant pipeline or a long-distance pipeline? Since hydrogen is a special gas, the petrochemical fire protection regulations stipulate that hydrogen pipelines should not be buried. However, the technical standards for interplant pipelines (GB/T 51359-2019) require that hydrogen pipelines must not be buried either. I would like to ask whether this hydrogen pipeline can be laid underground. Those who are aware of this, please offer some help. Thank you.
Such cases have been discussed on the HaiChuan Forum; the hydrogen pipeline of Yangzi Petrochemical-Yizheng Chemical Fibers, which is 35 KM long, was constructed as an overhead pipeline.
35 km is already considered a long transmission distance; the length of inter-plant pipelines is 30 km or less. Of course, it’s best to have it elevated, but are there any regulations requiring it to be elevated? Is it possible to bury it instead?
Hydrogen pipelines are not LNG pipelines or gas pipelines.
I’m not quite sure what you mean. Are you saying that hydrogen pipelines have stricter requirements and cannot be buried in accordance with the standards for long-distance pipelines?
But there are also cases of hydrogen pipelines being buried, right?
It’s very rare; try to avoid it, as it will cause a lot of trouble during future inspections by agencies like the Special Inspection Agency.
A 25 km hydrogen pipeline from a petrochemical plant to a steel mill can be considered an interplant pipeline, but it is not a long-distance pipeline. According to the definition of long-distance pipelines in GB/T 34275-2017 \"Code for Pressure Piping – Long-Distance Pipelines\", it does not involve any of the hydrocarbon commodities such as crude oil, natural gas, or liquefied petroleum gas.