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Ms. Shannon Ullmann 970-384-9060
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Photo 0313 Added Jan 12 '07 |
 Photo 01 |
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Photo 0247 Added Jan 26 '07 |
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Dec 19 2006
As I mentioned on the phone the town of New Castle currently 4 water treatment units - 2 that run at 275gpm and 2 that run at 350gpm capacity. We will be adding a 5th unit to run at 350gpm. I believe the maximum chlorine feed rate that we will need when everything is running at full capacity will be about 96ppd. We will design the system to this but don't anticipate running it at this rate on a continuous basis (possibly as low as 7 ppd). Currently, operators say they change the single tank out once a month in the winter and twice a month in the summer.
The current chlorination system pulls
water from a clearwell via submersible pump (don't
yet have specs for this pump but I hope to have that info soon).
Chlorine rate is monitored by
wall mounted flow meters and sent to ejectors. At this point there
are 3 flowmeter-ejector setups. The solenoids are used for
chlorination feed control when
not all of the treatment units are operating. I
don't have the information for the solenoids yet. I have
attached photos showing the existing chlorination system for the
plant.
For
the system update, we would like to be able to control
chlorination based on how many treatment units are running and are
therefore anticipating a total of 5 flowmeter-ejector (1 for each
treatment unit to be turned on or off depending on if a unit is in
operation) setups rather than 3. Given the design chlorine feed rate
we are considering a 2-tank system - with automated switchover valve or
not will depend on the client. We will need 1 more regulator in the
event that we go to a 2-tank system.
As you can see from the photos, the ejector manifold, and flowmeter
areas are rats-nests. We would like to mount and manifold ejector
piping and flowmeters onto the walls, similar to the what you've done
with Boulder.
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Dec 19 2006 Assuming the flow in Photo 00 to be to the right and up into the ejectors, the solenoids are indeed on the outlet of the ejector. This is a BAD thing. The downstream side is the low pressure side and the reason the ejector has a check valve integral to it. When the water supply is shut off, the two check valves (Superior Equipment) are used to keep water from going back into the gas line and fouling the Rotameter and the Regulator. When both sides are open and the differential causes flow, there is a vacuum there and no water pressure on the ejector check valves. These are the only two design conditions! So, inlet can be shut off THEN outlet can be shut off. Never the outlet first and NEVER the outlet only! As I thought, they're using $300 solenoids, unnecessarily. 1/2" brass solenoids and 1/2" PVC ball checks on the inlet side would suffice. These lines go up and then down? Was it siphoning? A Vacuum breaker might be needed. Cl2 gas not absorbed by the filter effluent flows can get to levels where they will cause corrosion in the lower parts of the plant. If clearwell rises and falls, it acts like a piston and pumps air out when it rises. I have a customer that pumps about 500 cubic feet of moist, chlorinated air into his pipe gallery every time his clearwell fills, which is several times a day. Conduit for the pumps carries the gas to the MAIN MCC for the Plant, upstairs, which is highly rusted! Needs individual outside vent. |
| I'll make up some sketches of the ejector and remote metering panels, etc. |
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Ms. Shannon Ullmann 970-384-9060
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