Description And Operation; Pump Unit; Water Inlet; Air Inlet - Wilhelmsen Ships AIRCLEAN 32 User Manual

DESCRIPTION AND OPERATION

E.2
E.2.1

Pump unit

The pump unit comprises a single acting pump powered by a double acting air motor. An air shuttle
valve that changes the air direction when the piston reaches the end positions controls the air motor.
E.2.2

Water inlet

The connection is marked "Water". Use a water supply hose with minimum diameter as specified in
enclosure 2 "Dimensioning of water- and air inlet". It is recommended to connect a low-pressure hose
of minimum 3 meters length to the water inlet of the unit to prevent shock in the water system.
The suction head capacity of the pump is reduced with increasing temperatures. Increased supply pres-
sure may therefore be required when pumping hot water. The suction line must be free from leeks.
Claw couplings are not suitable for suction lines with pressures below atmospheric pressure.
E.2.3

Air inlet

The air connection is marked "Air". Use air supply hose with minimum diameter as specified in enclo-
sure E.2 "Dimensioning of water- and air inlet". Do not fit valves, fittings etc. with less diameter than
specified in enclosure E.2. If regulation is required at the unit, it is recommended to fit a full-bore ball
valve and use this for throttling the air supply. If you are going to use an air pressure regulator it must
be plentiful dimensioned for the airflow.
E.2.4

Chemical dosing

A high-pressure injector fitted between the high-pressure pump outlet and the high-pressure hose may
dose chemicals. You may need to turn down the water pressure by throttling the air motor to achieve
that the injector will work properly. We recommend to disconnect the injector when not in use because
it "steals" pressure.
E.2.5

Cleaning procedures

Hot water, if available, will always give the best result and reduces the need for chemicals. The follow-
ing procedures are recommended to get the best result when working with detergents:
- Apply the detergent with a wide-angle spray. Start at the bottom and move upwards. The spray
distance should be approximately 40 cm.
- Leave the detergent to work approx. 3 minutes, or according to the manufacturer's instructions.
However, do not let detergent dry on the surface.
- Start cleaning from the bottom and move upward. This prevents water to run down and dilute
detergent below. The spraying distance should be 10 – 30 cm.
- When cleaning is completed, wash down from the top to prevent stains. Use water generously.
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