Figure 6-3 - Water-Cooled Heat Exchanger Coolant Requirements - Gardner Denver VST110 Operating And Service Manual

KW Model
All VST110-180A
* Flows exceeding "Maximum Water Flow" will cause severe erosion and will void unit warranty.
Figure 6-3 – WATER-COOLED HEAT EXCHANGER COOLANT REQUIREMENTS
The water supply shall be capable of delivering the flow/temperature combinations shown in Error!
Reference source not found., page Error! Bookmark not defined., at a minimum pressure of 40 psig (2.8
bar) - the water flow rates shown are approximate and a guide to sizing of piping, cooling tower and other
water system equipment.
The maximum allowable supply water pressure is 150 psig (10.3 bar) and the maximum allowed
[package] outlet water temperature is 110°F (43°C). If a water supply with a temperature lower than 60°F
(16°C) is used, heat transfer areas of the coolers may be fouled due to low water flow velocities, resulting
in poor cooler performance and shortened operational life.
All the required hardware, mechanical and electrical connections have been made at the Gardner Denver
factory. Regular maintenance is required to keep the interior core areas free from dirt and other fowling
agents. In order to protect package components that are in contact with the cooling water from attack by
corrosive or fouling agents, we recommend that the cooling water meet the following quality standards:
Total Dissolved Solids (TDS) ....................
Iron ..........................................................
Total Hardness .........................................
Silica ........................................................
Oil and Grease .........................................
Sulfate .....................................................
Chloride ...................................................
Nitrate ......................................................
Corrosivity ................................................
It is strongly recommended that a reputable, local firm be contracted to evaluate the quality of water
available and recommend corrective and/or preventive steps to meet our requirements.
Hex head zinc anodes are used in the return bonnet (opposite end to the water pipe connections) of heat
exchangers to provide internal water system corrosion protection. These anodes should be inspected
periodically and replaced when the zinc has been reduced to about 1/2 inch (13 mm) in length.
WATER FLOW REGULATING VALVE (OPTIONAL HARDWARE). – This device is used to adjust the
flow of cooling water in proportion to its temperature. It's a normally closed (two-way) valve which opens
once the thermostatic bulb senses a predetermined water temperature level and then continues to
modulate water flow to maintain water temperature – within a 2° F to 5° F span. The package piping
provides a permanent bypass line (1/4" tube) around the flow regulating valve to ensure water flow
around the sensing bulb when the valve is in the closed position – it does not provide a complete shutoff
of water flow.
AIR & OIL COOLER (Series Water Piping)
Water flow requirements at
various inlet water temperatures
(gpm)
60° F 70° F 80° F
36.7 46.9 65.0
13-17-605
Maximum
Water Flow
90° F
(gpm) *
106.0 106.0
<500 ppm
<2 ppm
<60 ppm
<25 ppm
<5 ppm
<50 ppm
<50 ppm
<2 ppm
Langelier Index between 0 to1
Page 55
Approximate (total) water
pressure drop @ 90° F
water flow
(psi)
36.9