2-Pack Analyzer System
4–6 4900002256 rev. B 4-13-21
Tostartupthesamplebypassstreamonprocesssample
1. Ensure the low pressure flare or atmospheric vent header shut-off
valve is opened for the bypass flow effluent from the SCS.
2. Open the sample supply port shut-off valve.
3. Open the bypass flow meter metering valve to establish sample flow
from the sample probe and set the metering valve to the specified
value.
4. Confirm that the sample supply pressure under flowing conditions is
set to the approximate specified pressure.
Tostartuptheanalyzeronprocesssample
1. Ensure the low pressure flare or atmospheric vent header shut-off
valve is opened for the sample flow effluent from the SCS.
2. Open the sample flow meter metering valves to the approximate
specified flow for each measurement cell.
3. If required, adjust each sample pressure regulator to the specified
setpoint for each measurement cell.
Do not open the cell flow meter at this point.
Make sure that no liquid, solids, etc. are flowing through the
bypass valve by viewing the flow meter. If substances are
present, shut down the system and purge the lines.
Although the exact supply pressure setpoint is not critical, the
pressure at the sample system should be within 5 PSIG of the
specified supply pressure setpoint. There may be a difference
between the pressure readings at the sample tap and inside the
SCS due to the pressure drop in the sample transport line under
flowing conditions. If the pressure at the SCS under flowing
conditions is not sufficiently close to the specified setpoint, it will
be necessary to readjust the pressure regulator setpoint at the
field pressure reducing station to provide the required supply
pressure with the specified sample bypass flow.
This procedure can be completed during the system warm-up
process.
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