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Avoid Excessive Tubeside and Shellside Water Velocities
To prevent damaging vibration and erosion, do not exceed the flow rates listed below.
Model
Max. Blowdown Flow Rate
X43
X46
X66
X69
X89
Do Not Allow Make-up Water to Be Heated Above 140°F to avoid:
a. severe shellside scaling of the XC Heat Exchanger
b. liberated dissolved gases which corrode and erode the exchanger, valves, piping
and deaerator inlet.
Maintain and adjust the proportional control valve so it will properly proportion makeup
to blowdown – to stop overheating of makeup. Replace damaged rubber diaphragms
(of the proportional control valve) because undamaged diaphragms are essential for the
proper operation of the proportional control valves.
Avoid Contaminating the Make-up with Chloride Ions from Water Treatment
Systems
This can cause stress corrosion of stainless steel tubes in the XC Heat Exchanger.
Water treatment systems (Zeolite softeners and demineralizers) are regenerated with
sodium chloride and hydrochloric acid. If not adequately back-washed before returning
to service, these systems will heavily contaminate the make-up water with chloride
ions. Chloride ions, together with the low pH water from the treatment systems may
cause stress corrosion of the stainless steel tubing of the XC heat exchanger, resulting in
premature failure.
The water treatment system operator should measure the output water (using
conductivity meters, cells, etc.) to verify that a regenerated system is adequately back-
washed before returning the water treatment system to service.
10
2 gpm (7.6 lpm)
4 gpm (15.1 lpm)
9 gpm (34.1 lpm)
14 gpm (53.0 lpm)
22 gpm (83.3 lpm)
Max. Make-up Water Flow
Rate
48 gpm (182 lpm)
48 gpm (182 lpm)
130 gpm (492 lpm)
130 gpm (492 lpm)
180 gpm (681 lpm)
Sentry Equipment Corp
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