Water Connection For Water-Cooled Units - Gardner Denver L Series Original User And Service Manual

7.3 Water connection for water-cooled
units
DANGER
Risk of live threatening diseases. If open
cooling towers are used in the cooling water
circuit, it is possible for legionella
(Legionella pneumophila) and other bacteria
to grow and spread.
 The growth and spread of bacteria must
be prevented by corresponding service
and water treatment methods.
CAUTION
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.
NOTICE
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.
The cooling-water circuit is completely installed in the
screw compressor system.
The water connections are as follows:

Water inlet:

Water outlet:
Permissible cooling-water data:

Cooling-water pressure:

Min. cooling-water inlet temp.:

Max. cooling-water inlet temp.:

Cooling-water outlet temp.:
The cooling-water requirement at maximum operating
pressure:
L90(RS) W
L110(RS) W
L132(RS) W
∆T:
Cooling water outlet temperature =
cooling water inlet temperature + ∆T
∆p:
Cooling water outlet pressure =
cooling water inlet pressure + ∆p
This data is based on fresh water and the cooling-water
quality recommended by Gardner Denver (see
Section 7.3.1). 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.
Compressed air outlet temperature = cooling water inlet
temperature + (13 to 16 °F).
NOTICE
Wherever possible, the cooling-water outlet
temperature should be below 122 °F, in order
to prevent excessive precipitation of limestone
fur.
13-25-639 v00 Page 28
1 1/4 – 11 ½ NPT
1 1/4 – 11 ½ NPT
33 gal/min (@ ∆T=25°F, ∆p = 21 psi)
24 gal/min (@ ∆T=31°F, ∆p = 12 psi)
45 gal/min (@ ∆T=22°F, ∆p = 31 psi)
145 PSI
41 °F
95 °F
133 °F