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Sanitary Force Mains
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Source：Internet Author：Unknow Pubdate：2008-06-02
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GoldDredger (Civil/Environme)
2 Jun 08 9:44
A collegue came to me with a question regarding sanitary force main construction. They are designing an 8" main from a lift station. Along the way, the force main dips into a low spot then climbs back out towards it's destination. He asked if any provisions for sediment accumulation at the low spot should be made.
We both got a laugh at the thought of installing a blow off valve at the low spot.
I don't think any provisions are needed. It would be cost prohibitive to transition to gravity, then another pump station at the low spot.
I thought I would check here and see if anyone has an opinion.
bimr (Civil/Environme)
2 Jun 08 10:32
Solids do not settle out if the velocity in the force main is a minimum of 2 ft/sec. 字串2
Solids do settle out at lower velocities or when the pump is stopped and a velocity of 3.5 ft/sec or greater is then required to resuspend the deposited solids.
A small to medium size pumping station with pumping intermittently, the desirable force main velocity would be 3.5 to 5 ft/sec.
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