Humboldt HM-4160 FlexPanels - Manual (Page 22)

Applying Initial Cell Pressure
The following steps should be followed when applying the initial cell pressure
before starting back pressure saturation.
1) If the sample length is being monitored take a reference reading before
applying pressure to cell.
2) Turn the selection valve (A1) to the pressure position.
3) Lift the Toggle Valve (T1) and check the pressure setting of the pressure
regulator (R1).
4) Those systems with a Master Control Panel can read the pressure on the
Digital Display.
5) Adjust the Pressure Regulator to a pressure between 2 and 5 psi
(14 - 35 kpa).
6) Turn either the External Valve (E1) or Burette Valve (V1) to the open position.
7) Open the Cell Pressure Valve on the Cell and the Cell will now
be pressurized.
Flushing Triaxial Cell Drain Lines
The following steps should be followed to flush air out of the Triaxial Cell
drainage lines or any air trapped during sample set up.
To flush the Base:
I) Turn the Selection Valve (A2) to the Vent position.
2) Turn the External Valve (E2) to the External position.
3) Open the Triaxial Cell's Base Drain Valve, which is connected to the
tube leading to the FlexPanel.
4) Open the Triaxial Cell's Base Drain Valve, which is not connected to the
Flexpanel so water can flow through the Base Valves and flush air bubbles
out of the Base Drainage Lines. If a transducer is connected to the Base
Drainage Valve it will need to be vented so water can flow through it
5) When it appears that all the air is out of the drainage line close the Valves
being used to flush the Base Drain Lines.
To flush the Top:
6) Turn the Selection Valve (A3) to the vent position.
7) Turn the External Valve (E3) to the External position.
8) Open the Triaxial Cell's Top Drain Valve, which is connected to the
tube leading to the FlexPanel.
9) Open the Triaxial Cell's Top Drain Valve, which is not connected to the
Flexpanel so water can flow through the Top Drain Lines and flush air
bubbles out of the Top Drainage Lines. If a transducer is connected to the
Top Drainage Valve it will have to be vented so water can flow through it.
10) When it appears all the air is out of the drainage lines close the Valves
being used to flush the Top Drain Lines.