Wallace & Tiernan SERIES V-2000, Manual

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WT.025.055.004.UA.IM.0814
MANUAL CHLORINATOR - 3000LB/24HR
EVOQUA W3T109620
2.16 Injector Arrangements For Intermittent Start-Stop Operation
If the gas feeder is to be operated intermittently in conjunction with a pump
or other equipment, this is usually accomplished by one of the following:
• Two-inch injectors with three-way shut-off valves may be fitted with so-
lenoid valves as shown in Dwgs. 25.100.006.122, 25.100.006.142, and/or
25.100.006.152 in this section. Material for this purpose is furnished only
when specifically listed in the order.
• Other injectors may be shut off by means of an electrically operated valve
in the water supply line to the injector. In this case, flexible polyethylene or
rigid PVC pipe is recommended for a minimum of three feet immediately
upstream of the injector. This should reduce corrosion of metal pipe and
components (valves, pump impellers, etc.) caused by diffusion of chlorine
solution during shut-down periods.