Damcos LPU: Emergency Operation of LPU V.2 Service Manual
February 2017 SM 8000-100-01 Ed 04
81
LPU-S
Note! This procedure applies to fail-close actuators.
For Fail-open actuators please contact Emerson Process Management.
Emergency opening of single acting actuator with hand pump
1. Connect hand pump P-line with B-line quick connection at the LPU.
2. Connect hand pump T-line with T-line quick connection at the LPU.
With suction to T and pressure to B the shuttle valve will change over and prevents the oil from
flowing to tank.
3. Operate hand pump and actuator will open.
4. Disconnect hand pump
Emergency closing of single acting fail-close actuator
1. Open cross-over valve on actuator and let it stay open until the required position is reached.
2. When the valve is fully closed, the shuttle valve will be reset.
Emergency opening of single acting fail-open actuator
1. Open cross-over valve on actuator and let it stay open until the required position is reached.
2. When the valve is fully closed, the shuttle valve will be reset.
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