Evoqua Wallace&Tiernan 50-200 Series, Manual

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WT.050.200.001.UA.IM.0814
50-200 EVAPORATOR FOR CHLORINE
44
EVOQUA W3T98237
(3) Leave the evaporator outlet valve shut for approximately 30 minutes.
Under these conditions, most of the liquid chlorine will be forced back
to the supply tank through the inlet nipple and the remaining liquid
will be evaporated by the heat of the water bath. At the end of this
period, shut the valve at the tank car or the ton container, immediately
open the evaporator chlorine outlet valve, and run the chlorinator to
exhaust the gas in the evaporator and the gas and liquid in the inlet
line. When the evaporator pressure gauge reads zero, the chlorine
outlet valve may be closed. If the evaporator pressure gauge shows
pressure after the outlet valve has been closed for several minutes,
repeat the above procedure until the evaporator pressure gauge reads
zero with outlet valve closed. Then turn off power to the control system
and alarm units. If no standby evaporator is being used, shut down the
chlorinator. Remove the enclosure and the associated hardware.
b. Drain water from the water tank by opening drain valve (17). See drawing
50.200.060.010.
c. Remove cap plug (57) from top of water tank.
d. Through the port hole located on top of the hot water tank, examine
the visible exterior of the chlorine cylinder with a flashlight. Inspect the
surface. If signs of pitting or corrosion are evident, proceed to paragraph
4.13, Five-Year Inspection.
WARNING: TO AVOID SEVERE PERSONAL INJURY DUE TO INHALATION
OF CHLORINE, USE AN APPROVED GAS MASK AND BE PREPARED TO
RECONNECT UNION QUICKLY IF THERE IS ANY SIGN OF PRESSURE
IN THE GAUGE LINE.
CAUTION: Do not disturb the threaded joint between the pressure gauge and
the protecting oil-filled capsule. Any loss of oil will result in a faulty indication
by the pres sure gauge.
e. Remove the temperature gauge (97) bulb from the well in the cylinder
flange (30). Put on an approved-type gas mask before proceeding. Dis-
connect the pressure gauge (87) and the chlorine inlet and outlet piping
through the unions (19) on the top of the cylinder.
f. Remove the upper cylinder flange cover plate from the cylinder (30) and
attached parts. Note the orientation of the chlorine inlet and outlet pipes.
CAUTION: Do not lose or misplace any of the nuts or brackets when disas-
sembling the upper flange.
g. Examine the interior of the cylinder. Because residues vary widely, it is
not possible to describe exactly what may be found. However, it may be
expected that the upper portion of the cylinder will be lined with a reddish-
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