Gardner Denver L Series Original User And Service Manual page 33

Environmental hazard! As a result of leakage in oil/water coolers, some oil may get into
the cooling water circuit.
The following items must be noted for operation of water-cooled screw compressor systems:
 Cooling water must not be discharged indiscriminately into public waste-water and drain
systems. Uncontrolled overflow of oil-separator basins into public waste-water systems
must be prevented.

Waste-water law provisions must be carefully adhered to.
The cooling water must be drained if there is a danger of frost occurring or in case of a prolonged
shutdown of the screw compressor system. Always perform maintenance, servicing and repair work
carefully. Dismantled bundles of pipes have to be checked for integrity before being reinstalled. In the case
of even the slightest damage, replace the pipe bundle. Always use new seals when carrying out assembly
work.
Connect the compressor to the cooling water network
The compressor is fully assembled at the factory. The connection to the cooling water network
should be made with a flexible line, that is, a compressed air hose or compensator.
Use only connections that are the correct size.
1. Ensure that the lines can be connected with no tension.
2. Connect the connection line to the cooling water inlet and outlet of the compressor.
3. Shut-off valves must be installed at the cooling water inlet and cooling water outlet.
4. Secure hose lines.
Cooling water inlet and cooling water outlet:

USA/CANADA version: 1 1/2" NPT

European version: EN 10226-1 Rp 1 1/2

Permissible cooling water data Max. cooling water pressure: 10 bar / 145 psi

Min. cooling water inlet temperature: 5°C / 41°F

Max. cooling water inlet temperature: 42°C / 107°F

Max. cooling water outlet temperature: 57°C / 134°F
Δp [psi]
P [KW]
160
200
250
290
Chart 5-1: Cooling water requirement at maximum power and (ΔT = 10K)
Δp:
Cooling water outlet pressure = Cooling water inlet pressure - Δp
This data is based on fresh water and the cooling-water quality recommended by Gardner
Denver. Please contact Gardner Denver if the cooling-water data diverges from this.
The flow of cooling-water for the water cooler at commissioning can be adjusted by means of
a manual control valve.
Wherever possible, the cooling water outlet temperature should be below 57°C / 135°F, if possible, in
order to prevent excessive lime sediment.
V [gal/min]
13 39.6
16 47.5
19 52.8
34 60.7
13-25-640 v00
CAUTION
NOTICE
NOTICE
Page 33