Chandler Engineering AMETEK 7200, Инструкция по эксплуатации

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2-20 SECTION 2 – OPERATING INSTRUCTIONS
back into the accumulator as the cement expands during the test, and allowing
approximately 50 - 75 cc water to be pushed out of the accumulator and into the
underside of the diaphragm, to compensate for cement shrinkage during the test. Quickly
remove the plug from the H
2
O Confining Pressure port on the lower end cap of the CHA
vessel, and connect the water-filled H
2
O Confining tubing to this fitting, and tighten the
fitting to seal it.
17. Close the oven door and preheat the oven, to the desired test temperature, but only up to a
maximum temperature of 90°C (a safe limit for pre-heating, since the cell will be opened
later).
18. Mix the cement slurry to be tested according to API Spec. 10, and condition it as desired
in an atmospheric consistometer at the test temperature. For tests at 90°C or above,
condition the cement at 90°C, to prevent vaporization of the water.
19. Open the oven door, pour the cement sample into the sample tube of the vessel, nearly to
the top (to within approximately 6 mm (
1/4” ) of the top).
20. With a lubricated O-ring installed in the upper end cap, place the upper end cap, RTD,
and wafer assembly in place on top of the sample tube, with the RTD (covered with the
heat-shrink TFE tubing) going down into the cement slurry.
21. Then, before purging air and applying pressure, you must:
a.
Make sure that the lower end cap is centered in place in the lower arm (Item 17 on
the #7200-1010 CHA Vessel assembly drawing).
b. Pull plunger knob (Item 19) out and rotate 90° to let it press against the vertical bar
of Item 17.
c. Rotate the upper arm (Item 18) into place above the upper end cap. The plunger
should fall into place in the slot of the vertical bar of Item 17.
d. Rotate the hand knob (Item 24) CW (clockwise) and tighten until it is tight (by hand
only), tightly clamping the CHA Vessel in place, in the stand, ready to contain
pressure.
This is important to prevent injury, since the arm and stand are part
of the CHA vessel, and necessary to contain pressure!
22. Connect the tubes to the H
2
O Fill/Purge port and Pore Pressure port of the CHA Vessel,
and tighten to seal them.
23. Close the oven door, and change the Oven Temperature Set point to the desired test
temperature.
24. Slowly open the 3-way valve on the CHA front panel to the FILL CELL TOP position,
and allow the low-pressure water to slowly fill the top of the vessel above the cement and
metal wafer (baffle).
25. Then, slowly open the H
2
O PURGE valve to slowly let water fill all of the top chamber
above the cement, out through the H
2
O PURGE valve, until it exits the H
2
O PURGE
tubing coming out of the back CHA instrumentation cabinet and purges all air from that
volume (length of 1/8” -OD translucent PFA tubing connected to the H
2
O PURGE
connection on the back of the CHA cabinet, with the open end routed to a beaker, so that
you can see any air bubbles being purged). Then, close the H
2
O PURGE valve.
26. Turn the 3-way valve to the CLOSED position.
27. Open the H
2
O Confining Valve, and adjust the H
2
O Confining Pressure to either the
desired test pressure, or some initially lower pressure (using the H
2
O Confining Pressure
regulator).
28. See the previously discussed Type 1, Type 2, or Type 3 Experiments for how to conduct
the desired experiment. If you are conducting a Type 3 Experiment, see its discussion for
running either a Procedure 1 or a Procedure 2. Set the H
2
O Confining Pressure and Gas
Injection Pressure to the desired test pressures, according to the type of test you wish to
conduct.