MTS Model 286-30 Pore Pressure Intensifier - Manual (Page 33)

Operating Procedures
286.30 Pressure Intensifier Operation 33
Procedure:
1. Open the Intensifier Fill valve several turns counterclockwise.
2. Check that the Reservoir Return valve is fully closed.
3. Set up the PPI’s electronic controller for operation in the displacement
control mode.
4. At the PPI’s controller equipment, turn on low hydraulic pressure.
5. At the displacement controller, cause the pressure intensifier’s piston rod to
slowly stroke to the lower end of it’s travel (piston fully retracted, zero
displacement position, zero command). This is done by means of the Set
Point control on the controller.
As the pressure intensifier’s piston retracts, fluid from the reservoir is drawn
into the pressure intensifier.
6. Close the Intensifier Fill valve.
7. Open the Reservoir Return valve two turns.
8. At the displacement controller, cause the pressure intensifier’s piston rod to
stroke slowly upward (extension, positive command) while observing the
reservoir for air bubbles. This action forces any air out of the intensifier.
When air bubbles cease to appear, stop the motion of the pressure
intensifier’s piston rod.
Note If air bubbles are still evident when the pressure intensifier’s piston
reaches the top of its stroke (full extension), repeat steps 1, 2 and 5
through 8.
9. Fully close the Reservoir Return valve and open the Intensifier Fill valve
two turns.
10. At the displacement controller, cause the pressure intensifier’s piston rod to
slowly stroke downward again until it is at about 10% of its full-scale stroke
range (10% extended). This action positions the piston in preparation for
pore fluid to flow to and pressurize the sample.
11. At the external controller equipment, turn off hydraulic power to the Pore
Pressure Intensifier.