3.14 Install additional safety equipment (optional)
WARNING
If your Process Tool/control system needs to know the total flow rate of
nitrogen to the iH system for safety reasons, install suitable measurement
equipment in the nitrogen supply pipeline.
WARNING
If you use the nitrogen purges to dilute dangerous gases to a safe level, ensure
that the system shuts down if the nitrogen supply to the iH system fails.
If the sensors or microprocessor fail, the total flow rate of nitrogen displayed or output by the
iH system may be incorrect. If you need to know the total flow rate of nitrogen to the HCDP
pump for safety reasons, you should therefore fit suitable measurement equipment in the
nitrogen supply pipeline. If you fit a rotameter, ensure that it is suitable for use with nitrogen
and that it is correctly calibrated.
If the nitrogen supply to the iH system fails, a warning message will be shown on the Pump
Display Terminal and will be sent to the Interface Module(s) connected to the iH system.
Ensure that your installation is configured so that it remains safe if there is a failure of the
nitrogen supply to the iH system.
If an alarm condition is detected (and the iH system is not configured to 'run til crash': see
Section 5.11) the iH system will shut down automatically. You must ensure that your
installation remains safe if the iH system shuts down automatically.
3-18 iH Dry Pumping Systems
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