6 | Baker Hughes
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Shutoff Test – Any unit with Underpressure Protection
1. Close upstream and downstream block valves and vent line
pressure on inlet and outlet sides. Slam Shut should trip
closed when venting.
2. Slightly open the upstream block valve, introducing line
pressure, and monitor the downstream piping for any
leakage.
3. Go through the ‘Resetting the Slam Shut’ procedure for
Slam Shut reset.
Alternate Shutoff Test #3 – Any unit with Underpressure
Protection (See Figure 7)
1. Must have a ball valve installed in the Slam Shut sense line.
2. Close the Slam Shut sense line ball valve and vent the
tubing. Slam Shut will then trip closed.
3. Re-connect the tubing and open the sense line ball valve.
4. Close the downstream block valve and vent the downstream
piping, and monitor the downstream piping for any leakage.
5. Go through the ‘Resetting the Slam Shut’ procedure for
Slam Shut reset.
Testing Regulator Shutoff with Integrated Slam Shut
When testing for regulator shutoff (lockup), the Slam Shut
must be in the open position during the shutoff test. Follow the
procedures below to ensure that the Slam Shut remains in the
open position. Refer to the Flowgrid IOM for regulator shutoff
procedures.
For the Overpressure Protection Only version of the Slam Shut:
1. Close the upstream and downstream block valves and vent
the line pressure
2. If the Slam Shut is not already in the open position, follow
the ‘Resetting the Slam Shut’ procedure to open the Slam
Shut.
For any Slam Shut version with Underpressure Protection:
1. Close the upstream and downstream block valves and vent
the line pressure.
2. Connect a pressurized bottle into the Slam Shut Sense Port
and apply a constant pressure above the Underpressure set
point (and below the Overpressure set point if applicable).
(See Figure 5).
3. Follow the ‘Resetting the Slam Shut’ procedure to open the
Slam Shut.
Start-up and Operation
With Mooney Flowgrid Slam Shut units, it is recommended that
the overpressure protection adjustment screw be turned fully in
(clockwise) & the underpressure protection adjustment screw be
turned fully out (counter-clockwise), prior to setting the Flowgrid
regulator. Follow the steps from the Flowgrid regulator IOM for
regulator Startup and Operation. For Slam Shut startup and
operation, follow the steps below:
Establish Set Point for Overpressure Protection Unit:
1. Close the upstream and downstream block valves and vent
the line pressure.
2. Verify that the Overpressure Protection adjustment screw is
turned fully in (clockwise) and the Underpressure Protection
(if applicable) is turned fully out (counter-clockwise).
3. Connect a pressurized bottle into the Slam Shut Sense Port
and apply the desired Set Point pressure. (See Figure 2).
4. Turn the adjustment screw out (counter-clockwise) slowly
until the Slam Shut trips closed.
5. Disconnect the pressurized bottle and re-connect the Slam
Shut sense line.
6. Follow the ‘Resetting the Slam Shut’ procedure to open the
Slam Shut.
Establish Set Point for Underpressure Protection Unit:
1. Close the upstream and downstream block valves and vent
the line pressure.
2. Verify that the Underpressure Protection is turned fully out
(counter-clockwise).
3. Connect a pressurized bottle into the Slam Shut Sense Port
and apply the desired Set Point pressure.
4. Turn the adjustment screw in (clockwise) slowly until the
Slam Shut trips closed.
5. Disconnect the pressurized bottle and re-connect the Slam
Shut sense line.
6. Follow the ‘Resetting the Slam Shut’ procedure to open the
Slam Shut.
