Sump for industrial buildings

[shahyar]

I am not civil engineer and I don't want to design a trench-sump for an industrial building (Indoor Plant). But I am just wondering if there is a rule of thumb to estimate the number of required sump for such buildings. I have seen very small and very big buildings with only one sump! How do they do sloping without going very deep if the building is very long?

Thanks

 

[bimr]

There is no rule of thumb for putting sumps in buildings. Each application is unique. There is generally a plumbing code requirement that each floor have a floor drain, but not a sump.

Yes, it is a problem to install drains when the building is long.

 

[SlideRuleEra]

Since the purpose of industrial floor drainage system is to keep standing liquid of the floor, floor slope is important. For cast-in-place concrete, positive drainage can routinely be obtained with a 1% (1/8" per foot) or greater slope.

However, once the liquid is off the floor (typically in a trench) then positive drainage is not as important unless there are suspended solids that need to be kept in suspension.
If suspended solids are not a concern, the trench bottom can have a very shallow slope, or perhaps even be level. This allows for long trench runs, without going very deep. Be careful, though - if there ARE solids to be transported by the liquid, there will be nothing but TROUBLE (settlement) in low-slope trenches.

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