Environmental Engineering Reference
In-Depth Information
Cause:
Chlorine residual is too low
Corrective action:
Increase contact time and/or increase chlo-
rine feed rate.
symptom 2.
•
Chlorinator has low chlorine gas pressure.
Cause:
Insufficient number of cylinders connected to the system
Corrective action:
Connect enough cylinders to the system so
the feed rate does not exceed recommended withdrawal rate for
cylinders.
Cause:
Stoppage or restriction of flow between cylinders and
chlorinator
Corrective action:
Disassemble the chlorine header system at
the point where cooling begins, locate the stoppage, and clean
with solvent.
symptom 3.
•
Chlorinator has no chlorine gas pressure.
Cause:
Empty chlorine cylinders or cylinders not connected to the
system
Corrective action:
Replace the empty cylinders or connect the
cylinders.
Cause:
Plugged or damaged pressure-reducing valve
Corrective action:
Repair reducing valve after shutting cylinder
valves and decreasing gas in the header system.
symptom 4.
•
Chlorinator will not feed any chlorine.
Cause:
Dirty pressure-reducing valve in the chlorinator
Corrective action:
Disassemble the chlorinator and clean the
valve stem and seat; precede the valve with a filter/sediment
trap.
Cause:
Chlorine cylinder hotter than the chlorine control appara-
tus (chlorinator)
Corrective action:
Reduce the temperature in the cylinder area;
do not connect a new cylinder that has been sitting in the sun.
symptom 5.
•
Chlorine gas is escaping from the pressure-reducing
valve.
Cause:
Ruptured pressure-reducing valve main diaphragm
Corrective action:
Disassemble the valve and diaphragm; inspect
the chlorine supply system for moisture intrusion.
symptom 6.
•
Chlorine feed rate cannot be maintained without icing
of the chlorine system.
Cause:
Insufficient evaporator capacity
Corrective action:
Reduce feed rate to 75% of evaporator capacity;
if this eliminates the problem, then the main diaphragm of the
pressure-reducing valve is ruptured.
Cause:
The external pressure-reducing valve cartridge is clogged
Corrective action:
Flush and clean the cartridge.
