Equipment Operation
Safety Manual 4
–3
Intermittent Operation
Toisolatethemeasurementcellforshort‐termshutdown
The analyzer can be isolated from the primary sample bypass section for short-
term shutdown or maintenance of the analyzer while allowing the sample
bypass flow to continue in a steady-state mode.
1. Close the sample flow meter metering valve (adjustment knob
turned clockwise) for each measurement channel. Do not
overtighten the metering valves or damage could occur.
2. Allow any residual gas to flow out of the measurement cells.
3. Close the low pressure flare or atmospheric vent header shut-off
valve for the effluent from each measurement cell.
ToisolatetheSCSforshort‐termshutdown
The SCS can be isolated from the process sample tap for short-term shutdown
or maintenance of the SCS without requiring the shutdown of the field pressure
reducing station.
Due to the high pressure of the process sample, it is advisable to
allow the sample bypass flow to continue during short-term
isolation of the analyzer. Continuing sample bypass flow allows
the field pressure regulator to continue normal operation without
possible overpressure and activation of the relief valve in the
event the pressure regulator leaks when the downstream flow is
discontinued.
Never purge the analyzer with air or nitrogen while the system is
powered up.
If the system will not be out of service for an extended period, it
is advised that power remain applied to the sample transport line
electric tracer, if applicable, and the sample system enclosure
heater.
Process samples may contain hazardous material in potentially
flammable and/or toxic concentrations. Personnel should have a
thorough knowledge and understanding of the physical properties
and safety precautions for the sample contents before operating
the SCS. Refer to “Potential Risks Affecting Personnel” on
page 2-5 for more information.
To Next Page
Loading...
Need help?
General
