Edwards ATEX 1 EHR, Instruction Manual

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A750-04-880 Issue F
Page 24 © Edwards Limited 2012. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
INSTALLATION
3.10 Connect the sealing liquid and seals flush pipelines
Connect the sealing liquid and seals flush system pipelines to the pump in accordance with the requirements shown
in the corresponding detail A, B or C of
Figure 1 .
Note that:

On ATEX Category 2 pumps configured for internal seals flush supplies or ATEX Category 3 pumps, you must
connect a sealing liquid supply pipeline to the pump.

On ATEX Category 1 and 2 pumps configured for external seals flush supplies, you must connect a sealing
liquid supply pipeline and seals flush liquid supply pipelines to the pump.
Refer to the System Manual for the sizes and locations of the sealing liquid and seals flush supply and drain ports.
3.11 Connect the pump inlet and outlet
3.11.1 Introduction
Take note of the following when you connect the pump process inlet and outlet:

For optimum pumping speeds, ensure that the pipeline connected to the process inlet is as short as possible.

The pipelines must have an internal diameter not less than the pump inlet/outlet diameter.

Support the pipelines to prevent loading of the inlet/outlet joints on the pump. The loads on the inlet and
outlet must not exceed the maximum loads specified in
Table 14 .

Use a suitable inlet trap or filter to prevent the entry into the pump of particles larger than those specified
in
Table 2 .

The inlet and outlet seals used must be compatible with the sealing fluid used, with the substances pumped,
and with the process/operating conditions.
3.12 Connect the process inlet
Use a suitable gasket as a seal and connect the pipeline from your vacuum system to the process inlet on the pump.
The gasket you use must be made of a material which is compatible with the process.
WARNING
Edwards cast iron pumps are treated with a corrosion inhibitor. To avoid contamination flush with
a suitable fluid.
WARNING
On an ATEX Category 2 pump configured for internal seals flush supplies and on an ATEX Category 3
pump, your system design must ensure that the sealing liquid supply cannot be interrupted when
the pump is operating
WARNING
On ATEX Category 1 and 2 pumps configured for external seals flush supplies, your system design
must ensure that the sealing liquid supply and the seals flush liquid supplies to the pump seals
cannot be interrupted when the pump is operating.