Evoqua Wallace&Tiernan 50-200 Series, Manual

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50-200 EVAPORATOR FOR CHLORINE
WT.050.200.001.UA.IM.0814
47
EVOQUA W3T98237
d. Disconnect the ammonia union (19) at the bottom chlorine inlet (47).
e. Unbolt (23) and remove the chlorine inlet (47) fromt the bottom of the
cylinder (30).
f. Disconnect the four cylinder mounting bolts (26) beneath the evaporator
water tank (29). Remove the cylinder (30) from the hot water tank (29),
using the two lifting brackets (see Dwg. 50.200.150.010).
g. Remove the external scale, etc. Verify that the inside of the cylinder is free
of residue.
h. Weigh the cylinder. (Exclude the internal riser, top flange, brackets, bolts,
nuts, gaskets, and down-drop pipes.)
i. If the present weight is 10 or more pounds less than the original tare weight
(stamped on the cylinder), scrap the cylinder and replace it with a new
one.
NOTE: Exterior corrosion indicates improper maintenance of the cathodic
protection system. Interior corrosion usually indicates the presence of mois-
ture in the cylinder.
j. Clean, inspect, and replace, as necessary, the hot water tank, temperature
switch sensing bulb, overflow outlet, and cathodic protection anodes. If
there is any doubt about any component, replace it.
k. Replace the new or re-tested cylinder (30) into the hot water tank (29) with
a new bottom gasket (28, Dwg. 50.200.060.010). Install four bolts (26).
l. Reassemble per steps (n, h, and e) “In-Place” Cleaning of Evaporator Cyl-
inder Procedure (paragraph 4.12).
4.14 Operational Inspection of the Pressure Relief Systems
Perform an operational inspection of the pressure relief system before completely
re-assembling the evaporator exterior piping. Make the following checks on
the pressure relief systems during “in-place” cleaning at the five-year inspec-
tion of the chlorine cylinder.
WARNING: TO AVOID THE RELEASE OF CHLORINE INTO THE ATMOSPHERE,
DO NOT REMOVE EITHER PRESSURE RELIEF SYSTEM WHILE THE EVAPORA-
TOR IS PRESSURIZED. BEFORE ATTEMPTING TO SERVICE THE PRESSURE
RELIEF SYSTEM, FOLLOW STEP A IN PARAGRAPH 4.12.
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