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Valve to throttle flow in a force main

Valve to throttle flow in a force main

Valve to throttle flow in a force main

(OP)
I have a grinder pump station where an automatic sampler will be required to sample the effluent from the station.  Since the sampler needs "non pressurized" flow and a stream of about 15gpm, the manufacturer's rep has recommended a loop be constructed immediately at the start of the force main.  

It's a 3-inch force main and the loop will be a 1.5 inch PVC going right back into the wetwell, which will be throttled through the use of a valve to achieve the desired 15gpm.  The manufacturer's rep has recommended just using a pvc ball valve in this case, but I'm not sure what other options I might have.  Normally we wouldn't use a ball valve in wastewater applications but perhaps it's OK on a bypass loop such as this?

RE: Valve to throttle flow in a force main

Why not put the sampler at the discharge location?  You can drop it down the manhole or whereever the forcemain ends.

I wouldn't be really keen on making a bypass loop like you are talking.  15gpm bypass will really hurt the efficiency of your grinder pump.

RE: Valve to throttle flow in a force main

Why don't you just get a sampler that can do the job. This model can take a sample from a pressurized line:

http://www.bvssamplers.com/BVS_Info.pdf

RE: Valve to throttle flow in a force main

(OP)
semo, the reasons for not sampling at the discharge location are that it's three miles from the project site, and the discharge is mixed with other wastes.

bimr, I spoke with the folks at BVS, sounds like this is another option, albeit more expensive.  Options are always good...thanks!

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