CompAir EO40/0001, User Manual

CompAir Limited

page 22

When the compressor is piped into an existing

rigidly fixed compressed air main the length of pipe

between the compressor delivery flange and the

nearest fixed support should be at least 3 m. This

connecting pipe must include a 90° bend of 0.3 m

minimum radius with a straight vertical length of pipe

of at least 1.2 m between the compressor delivery

flange and the bend.

When an aftercooler is installed in a system

incorporating an air receiver, the aftercooler should

be between the compressor and the receiver. If a

non-return valve is incorporated, this should be

upstream of the aftercooler. If the aftercooler is

positioned close to the compressor the connecting

pipework will normally be in the form of an inverted U

loop and one vertical leg of the loop must be at least

1.2 m in length. The connection between the

aftercooler and the air receiver must be arranged as

in the previous paragraph.

It is essential that all pipework is made and installed

so that it is not constrained or distorted when

connected to the compressor, aftercooler or user's

pipework. Use 90° bends with 0.3 m minimum

radius. Do NOT use elbows.

Where the installation includes a water cooled

intercooler and/or aftercooler, valves must be

installed in the water inlet and outlet pipes to allow

the compressor and the aftercooler to be isolated

from the water supply. If the compressor is to

operate under automatic start/stop control the

isolating valves on the inlet pipes should be solenoid

operated and the solenoids interconnected with the

compressor starter. This will ensure that the water

supply is cut off when the compressor shuts down

or is on standby.

If the compressor is operating under air governor

control fit 'Iockshield' valves in the water inlet pipes

to the intercooler and aftercooler to allow control of

cooling water flow. This is particularly important in

multiple installations.

Where necessary the cooling water system must be

protected to prevent freezing.

If the compressor is connected into a central cooling

system check that the cooling water is of good

quality.

Whenever cooling towers are used in the water

cooling system expert advice must be sought

regarding the precautions to be taken to prevent the

development of harmful bacterial growth which could

cause a health hazard.

On installations equipped with individual cooling

towers the power supply to the water pump and the

cooling tower fan must be interlocked with the

compressor starter. The operation of the cooling

tower fan should also be controlled by a suitable

thermostat fitted in the cooling tower sump.

It is recommended that the pipe from the

condensate valve should lead to the disposal

system by way of an open drain or tundish so that

valve operation may be observed.

If an air dryer is installed with the compressor it

should be located downstream of the air receiver.

Bypass valves and piping should be fitted so that

the dryer may be isolated for servicing. If the dryer is

of the desiccant type a prefilter and an afterfilter

must be incorporated, particularly if used with a

lubricated compressor.