Connect The Pump Inlet; Connect The Pump Outlet - Edwards E2M28 Instruction Manual

4.8 Connect the pump inlet

Take note of the following information when connecting the pump to the vacuum
system. Refer to
▪ For optimum pumping speeds, ensure that the pipeline connected to the inlet-port
is as short as possible and has an internal diameter not less than the inlet-port
diameter.
▪ Support the vacuum pipelines to prevent loading of the coupling-joints.
▪ If necessary, incorporate flexible bellows in the system pipelines to reduce the
transmission of vibration and to prevent loading of coupling-joints. If you are using
flexible bellows, ensure that bellows are used which have a maximum pressure
rating which is greater than the highest pressure that can be generated in the
system. It is recommended that manufacturers flexible bellows are used.
▪ Use a suitable inlet catchpot if pumping condensible vapours or if using the pump
for very dusty applications.
▪ Ensure that sealing surfaces are clean and scratch-free.
Connect the vacuum system to the inlet-port
11). To make this connection:
▪ Connect to the NW25 flange supplied: use the NW25 centring-ring and O-ring
supplied.
▪ Remove the NW25 flange and connect to the 1 inch BSP threaded hole.
▪ Use an NW25 to 28 mm bore tube adaptor available as an optional accessory, refer
to

4.9 Connect the pump outlet

WARNING:
Connect the pump outlet to a suitable treatment plant to prevent the discharge of
dangerous gases and vapours to the surrounding atmosphere. Use a catchpot to
prevent the drainage of contaminated condensate back into the pump.
The exhaust system must be configured so that the maximum pressure at the pump
outlet does not exceed 0.5 bar gauge (1.5 bar absolute, 1.5 x 10
throughput.
We recommend fitting an oil mist filter to the pump outlet in the following
circumstances:
▪ When using the pump with the gas-ballast control open.
▪ When operating the pump with an inlet pressure greater than 10 mbar for
extended periods.
▪ When frequently pumping down from atmospheric pressure.
The mist filter will trap the oil exhausted from the pump: the oil can be reused if it is not
contaminated.
To connect the pump to the outlet accessories or to the exhaust treatment plant:
▪ Connect 15 mm internal diameter vacuum or plastic hose to the outlet nozzle
(Figure: General view of the pump on page
A37310880_V - Installation
Accessories on page 44
Pump inlet adaptor on page
for details of the accessories mentioned below.
(Figure: General view of the pump on page
47.
11).
Page 26
5
Pa) at full pump