Atlas Copco GA 11+ Instruction Book page 77

Instruction book
Air receiver
Install the air receiver (to be purchased separately) in a frost free room and on a solid level floor,
suitable for its mass.
The air receiver must be fitted with a correctly sized and approved safety valve that is directly
connected with the vessel. At the bottom of the vessel, a drain needs to be installed to collect the
condensate.
For normal air consumption, the volume of the air net (receiver and piping) can be calculated
from:
V = (0.25 x Q
c
V = volume of the air net in l
Q = free air delivery of the compressor in l/s
c
P = compressor air inlet pressure in bar(a)
1
f = maximum cycle frequency (recommended: 1 cycle/30s)
max
ΔP = difference between unloading pressure and loading pressure in bar
T = compressor air inlet temperature in K
1
T = air receiver temperature in K
0
Moving/ lifting
The compressor can be moved by a lift truck using the slots in the frame. Take care not to
damage the bodywork during lifting or transport. The transport bolts cannot be removed until the
unit is on its fixed and final position. Reinstall these each time the unit is moved.
Make sure that the forks protrude the other side of the frame. The compressor can also be lifted
after inserting beams in the slots. Make sure that the beams cannot slide and that they equally
protrude the frame. The chains must be held parallel to the bodywork by chain spreaders in order
not to damage the compressor. The lifting equipment must be placed in such a way that the
compressor is lifted perpendicularly. Lift gently and avoid twisting.
Precautions for water-cooled compressors
Water flow and pressure to be adjusted depending on local conditions.
For cooling water quality, see section Cooling Water Requirements in this instruction book.
A water shut-off valve and a water drain valve should be installed by the customer in the
compressor water inlet pipe and outlet pipe. If water shut-off valves at the compressor water inlet
and outlet pipe are installed, a safety device with set pressure according to the maximum cooling
water inlet pressure (see section Reference conditions and limitations in this instruction book)
has to be installed between the compressor water outlet pipe and shut-off valve.
When operating the unit, the operator must ensure that the cooling water system cannot be
blocked. The above mentioned applies also to the energy recovery cooling water system.
2920 7118 31
x P x T ) / (f x ΔP x T
1 0 max
In case of units equipped with the Lifting Device Option, it is not allowed to lift the
compressor if the canopy parts or lifting supports are not completely installed. When the
compressor is being lifted, it is forbidden to come under the load or to perform maintenance
activities on it.
)
1
75