Sample Conditioning System
SCS Overview Manual 3
–7
7. Confirm that the sample bypass and analyzer flow meter control
valves are gently closed (adjustment knob turned clockwise).
Tostartupthefieldpressurereducingstation
1. Disconnect the sample transport tubing at the SCS and temporarily
run to a new, safe location (vent or flare).
2. Open the low pressure flare or atmospheric vent header shut-off
valve, if applicable, for the relief valve vent from the field pressure
reducing station.
3. Slowly open the sample probe process shut-off valve at the sample
supply tap.
4. Slowly open the pressure regulator at the field pressure reducing
station (adjustment knob turned clockwise) and set the pressure
regulator to the specified pressure. Refer to the analyzer system
drawings.
5. Blow sample through the sample transport tubing to flare or safe
vent to ensure that dirt or liquids are not collected in the sample
tubing.
6. Reconnect the sample transport tubing and set the pressure or the
regulator to the specified pressure.
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 shut-off valve in the SCS.
3. Open the bypass flow meter control valve to establish sample flow
from the sample probe and set the flow meter control valve to the
specified value. Refer to the analyzer system drawings.
Do not overtightened the control valves or damage could occur.
The process sample at the sample tap may be at a high pressure.
Use extreme caution when operating the sample probe isolation
valve and field pressure reducing regulator.
The low pressure flare or atmospheric vent header shut-off valve
must be “car-sealed” open and tagged as a relief valve vent so
that this valve will not be closed unless the SCS is not in
operation.
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