What material should be used to fill the gap between buried gasoline pipelines and sleeves?
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Dear friends, what material should be used to fill the gap between buried gasoline pipelines and sleeves? It must be fire-resistant. What is the specific name of that material? Or it is specified in some regulations.
There is no need to fill it; it can be buried directly in the ground.
Generally, the gap between buried gasoline pipelines and casings does not need to be filled
Buried pipelines do not have any special fire protection requirements, as they are buried underground and the likelihood of a fire occurring in that area is low. Any material can be used for filling, as long as it is airtight to reduce the gap between the sleeve and the main pipe.
I think asphalt hemp was used as a filling material before.