Figure 6-2 - Water-Cooled Heat Exchanger Coolant Requirements - Gardner Denver VS200-250B Operating And Service Manual

The ventilation system for the air-cooled package relies on positive back pressure to cool the heat
exchanger. Make sure that the enclosure panels that surround the heat exchanger area are closed
during compressor operation, or the compressor discharge temperature will reach shutdown
levels quickly.
WATER-COOLED HEAT EXCHANGERS – Optional water-cooled cores (brazed-plate type) are
available. Both cores are of a counter-current and cross-flow design. The cooling water is fed to the
cores in a series arrangement – it passes through the air core first and proceeds through the oil core
before exiting the package. Please refer to Figure 6-3, page 48 for estimates of requirements.
KW Model
200 VS200A
250 VS250A
* Flows exceeding "Maximum Water Flow" will cause severe erosion and will void unit warranty.
Figure 6-2 – WATER-COOLED HEAT EXCHANGER COOLANT REQUIREMENTS
The water supply shall be capable of delivering the flow/temperature combinations shown in Figure 6-2,
Page 47, 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 ..................................................
AIR & OIL COOLER (Series Water Piping)
Water flow requirements at
various inlet water temperatures
(gpm)
60 F 70 F 80 F
56 64 75
64 73 85
13-18-614
Maximum
Water Flow
90 F
(gpm) *
91 150
104 150
<500 ppm
<2 ppm
<60 ppm
<25 ppm
<5 ppm
<50 ppm
<50 ppm
<2 ppm
Langelier Index between 0 to1
Page 47
Approximate (total) water
pressure drop @ 90 F
water flow
(psi)
19
24