© Edwards Limited 2011. All rights reserved. Page 27
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Installation
A705-40-880 Issue B
3.10 Connect the pump-inlet and outlet
If your pump is part of an ATEX system, refer to the ATEX System instruction manual if you will pump toxic,
flammable or explosive gases.
Take all necessary safety precautions when you pump toxic, flammable or explosive gases. If you do not,
there will be a danger of injury or death to people.
Ensure that your system can provide adequate gas ballast and/or inlet purge to dilute toxic gases to safe
limits. If you do not, there will be a risk of emission of dangerous gases.
3.10.1 Connect the pump-inlet to your process system
Note: Flame arrestors suitable for use with the pump are available as accessories: refer to Section 7.4.
When you connect the pump to the process system:
Support process pipelines to stop the transmission of stress to pipeline joints.
You must be able to isolate the pump from the atmosphere and from your process system if you have pumped
or produced dangerous chemicals.
Ensure that the loads on the pump-inlet flange do not exceed the limits specified in Figure 5.
To get the best pumping speed, ensure that the pipeline which connects the process system to the pump is as
short as possible and has an internal diameter not less than the pump-inlet.
Use a flexible connection in the pipeline from the process system to the pump to reduce vibration and stress
in the system pipelines.
Use the following procedure to connect the pump-inlet to your process system. Do not allow debris to get into the
pump during installation. Refer to Figure 1.
1. The pump-inlet has an inlet filter:
If you install the pump in a new process system, leave the filter (4) in the pump-inlet (3) to prevent the entry
of weld particles or other debris into the pump. You will remove the filter in Section 5.5.
If you install the pump in an existing process system which you are sure does not contain any debris which
could damage the pump, remove the filter (4) from the pump-inlet (3).
2. Use four suitable bolts to connect the pump-inlet to your process system. Use a suitable PTFE gasket to seal the
connection. We recommend that you use the gasket type specified in Section 2.11.
Obey the safety instructions given below. If you do not, the installation may not be safe, and there
may be a risk of injury or death to people.
Do not exceed the load limits on the pump-inlet flange as specified in Figure 5. If you do, there
will be a risk of leakage of process gases from the pump, or of damage to the pump.
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