Dewatering Conduit

[kwired]

It doesn’t matter. The amount of pressure required to expel the water is largely determined by the burial depth. For very long runs, friction will come into play once it starts moving.

If a pipe is buried 3’, applying a pressure greater than 36” WC will start pushing the water out. The higher the pressure, the faster, as long as the air source can supply the required flow.

The lawn irrigation systems are not normally buried very deep, part of why they need to be blown out for winter in areas where it freezes. This shallow depth makes them easier to blow out, you don't necessarily need them completely blown completely dry either and they will make it through the winter. What you don't want is some low spot that sits completely full yet is above frost line.

 

[Hv&Lv]

I get it, and understand the math.
I’m just not having my guys wait around all day with a blower trying to produce 36”wc when a compressor will do it in about 3 minutes.

 

[kwired]

I get it, and understand the math.
I’m just not having my guys wait around all day with a blower trying to produce 36”wc when a compressor will do it in about 3 minutes.

If the blower won't produce it within a few seconds, it never going to produce it, without modification to the blower and/or risking damage by exceeding it's limitations