Sample Conditioning System
Hardware Installation and Maintenance Manual 4
–7
5. Confirm that the pressure regulator at the field pressure reducing
station is closed (adjustment knob turned fully counterclockwise).
6. Confirm that all sample system shut-off valves are closed.
7. Confirm that the sample bypass and analyzer flowmeter 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 system drawings in
Appendix A.
5. Blow sample through the sample transport tubing to flare or safe
vent to ensure that dirt or liquids are not in the sample tubing.
6. Reconnect the sample transport tubing and set the pressure
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.
Do not overtighten 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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