3.9 Connect the iH inlet to your vacuum system
Note: If required (that is, if you will use the iH system in an area subject to high RF (radio frequency)
emissions), connect the end of the iH earth (ground) cable to one of the bolts that you use to
connect the inlet-flange of the iH system to your process system. See Section 3.16.4 for more
information.
When you connect your iH system to your vacuum system, take note of the following:
•
To get the best pumping speed, ensure that the pipeline which connects the vacuum system to
the iH system is the minimum length possible and has an internal diameter not less than the iH
system inlet-port.
•
Ensure that all components in the vacuum pipeline have a maximum pressure rating which is
greater than the highest pressure that can be generated in your system.
•
Incorporate flexible pipelines in the vacuum pipeline to reduce the transmission of vibration
and to prevent loading of coupling-joints. We recommend that you use BOC Edwards braided
flexible pipelines.
•
Adequately support vacuum pipelines to prevent the transmission of stress to pipeline
coupling-joints.
•
On very dusty applications, use a low-impedance inlet-filter to minimise damage to the pump.
•
Incorporate a pressure gauge in the inlet pipeline, so that you determine that the iH system
operates correctly and (on iH600 systems) so that you can determine the correct booster start
delay (see Section 3.20.2). You can fit an Active Gauge Connection Kit accessory (see
Section 8.4.2) or an iH600 Pressure Control Kit accessory (see Section 8.4.3) for this purpose.
•
You must be able to isolate the iH system inlet from the atmosphere and from your vacuum
system if you have pumped or produced corrosive chemicals.
Use the following procedure to connect the inlet of the iH system to your vacuum inlet pipeline:
1. Remove the temporary cover or blanking plate from the inlet of the iH system. Retain the
nuts, bolts, washers and blanking plate for future use. Retain the temporary cover for future
use on non-contaminated pumps only.
2. Use the 'O' ring supplied and suitable nuts, bolts and washers (not supplied) to connect the
inlet-flange of the iH system to your vacuum system.
3-12 iH Dry Pumping Systems
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