For trenches, should sump pits be installed, and should they be filled with fine sand?

2018-08-30View Original

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In Class A factories (in collapsible soil areas), pipe trenches are installed; the pipes located in these trenches are all water pipes. Since the trenches contain only water pipes and the openings are sealed with cement, it is not necessary to fill them with sand to prevent flammable gases from entering. Moreover, there are no flanges or valves in the sections of the pipes that are inside the trenches, as they are all welded together; therefore, no sump pits are required. Is this understanding correct? ? ?

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For trenches, should sump pits be installed, and should they be filled with fine sand?

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