Piping; Ventilation - Edwards EOSi Series Instruction Manual

6.3 Piping

The vacuum distribution and piping system, including the pump and all related
components, must be designed in accordance with generally accepted engineering
practises. For example, inlet pipe work should slope away from the pump. Incorrectly
designed distribution systems can cause the damage to the pump. Exhaust pipes should
be installed in such a way that they do not create additional back pressure on the pump.
The exhaust pipes should be installed sloping away from the pump.
A drip leg with a drain point provision is given in the pump to prevent the condensate to
go back into the fluid reservoir.
Take precautions to prevent the installation of the pipes in a strain with the pump.
Use sufficient pipe diameter for the vacuum network. The combination of restrictive
pipe diameter and long pipes can create a pressure drop. For the single pump
installation, keep the diameter of the pump inlet as far into the process as possible.
We recommend to install an isolation valve at the inlet of the pump to isolate the pump
from vacuum distribution and piping system before you do the maintenance.
The discharge air can have temperature up to 120 °C (248 °F), make sure that the pipes
can take this temperature.

6.4 Ventilation

Install the inlet grids and the ventilation fan to prevent the recirculation of the cooling
air to the inlet grating of the pump. The air velocity to the grids must not be more than 5
m/s.
The maximum air temperature at intake opening at the intake opening is 46 °C (115 °F),
(minimum 0 °C / 32 °F).
Refer to
Ventilation alternative 1 and 3: The necessary ventilation to limit the pump room
temperature is calculated from:
Q = SF * P
v
Where,
Q = necessary cooling air flow (m³/s)
v
SF= Service factor of Motor (-)
P = Nominal motor power of the pump (kW)
nom
dT= Temperature increase in the pump room (°C)
Ventilation alternative 2 and 4:
The fan capacity should match the pump - fan capacity at a pressure head equal to the
pressure drop caused by cooling air ducts.
Maximum permitted pressure drop in ducting before or after the pump = 10 Pa.
6996022910_B
6996022910_B - Installation
Figure: Installation proposal.
/ (1.21 * dT)
nom
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