Quincy QGS 40, Instruction Book, Page: 64 / 132

Instruction book
62 2920 7101 22
• Δ p = Pressure drop in bar (recommended maximum: 0.1 bar (1.5 psi))
• L = Length of the pipe in m
• Q
c
= Free air delivery of the compressor in l/s
• d = Inner diameter of the pipe in mm
• P = Absolute pressure at the compressor outlet in bar
It is recommended that the connection of the compressor air outlet pipe is made on top of the main air
net pipe in order to minimise carry-over of possible condensate residue.
4. Ventilation: the inlet grids and ventilation fan should be installed in such a way that any re-circulation
of cooling air to the compressor is avoided.
The maximum air velocity through the grids is 5 m/s (16.5 ft/s).
The maximum air temperature at the compressor intake is 46 °C (115 °F) for gear driven units and 43
°C (109 °F) for belt driven units. (minimum 0 °C / 32 °F).
The required ventilation capacity to limit the compressor room temperature can be calculated
as follows:
Q
v
= 1.06 N/ ∆ T for versions without dryer
Q
v
= (1.06 N + 1.3)/ ∆ T for versions with dryer
• Q
v
= Required ventilation capacity in m
3
/s
• N = Shaft input of compressor in kW
•
Δ T = Temperature increase in the compressor room in °C
5. The drain pipes to the drain collector must not dip into the water of the drain collector. Any flow back
must be avoided. Oil/water separators to separate the major part of the oil from the condensate to
ensure that the condensate meets the requirements of the environmental codes are available.
6. Control module with monitoring panel.
7. Position of the main cable entry. Power supply cable to be sized and installed by a qualified
electrician.
To preserve the protection degree of the electric cubicle and to protect its components from
dust from the environment, it is mandatory to use a proper cable gland when connecting the
supply cable to the compressor.
8. Provision for inlet and outlet of the energy recovery system (system is optional).
9. The air receiver (optional) should be installed in a frost-free room on a solid, level floor For normal
air consumption, the volume of the air net (receiver and piping) can be calculated as follows:
V=(0.25 x Qc x P1 x To)/(fmax x ∆ P xT1)
• V= Volume of the air net in l.
• Qc= Free air delivery of the compressor in l/s
• P1= Compressor air inlet pressure in bar absolute
• fmax= Cycle frequency =1 cycle/30s
•
Δ P= P unload - P load in bar
• T1= Compressor air inlet temperature in K
• To= Air receiver temperature K
10. To prevent feedback of exhaust air to the cooling inlet, sufficient space should be foreseen above the
unit to evacuate the exhaust air.