Chandler Engineering AMETEK 7200, Инструкция по эксплуатации

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2-4 SECTION 2 – OPERATING INSTRUCTIONS
Fill Cell Top / Closed / Fill Accumulator valve
This 3-way (open, closed, open) manual ball valve is used to block or allow low-pressure
H
2
O (water) into the instrument.
After first lowering the H
2
O CONFINING PRESSURE to a pressure lower than the lower-
pressure H
2
O SUPPLY PRESSURE (by turning the H
2
O CONFINING PRESSURE
regulator knob fully counterclockwise (CCW) to reduce the pressure), to prevent damage to
the lower-pressure gauge, the valve is manually turned to the FILL ACCUMULATOR
position to fill the bladder accumulator with water. A check valve is between this valve and
the lower-pressure H
2
O SUPPLY PRESSURE gauge, to prevent backflow and protect the
gauge from over-pressure.
During test setup (first lower the PORE PRESSURE to a pressure lower than the H
2
O
SUPPLY PRESSURE, by opening the H
2
O PURGE valve), the valve is manually turned to
the FILL CELL TOP position to fill the top portion of the CHA vessel, above the cement and
rubber “wafer” (baffle), and fill the PORE PRESSURE gauge and tubing up through the H
2
O
PURGE valve with water, purging any air from that portion of the instrument.
During the test, and during any assembly/disassembly or removal of the CHA Vessel and
Stand, this valve must be manually CLOSED to prevent continued pressurization of the
system downstream of the valve, and to prevent over-pressurization of the low-pressure H
2
O
SUPPLY PRESSURE gauge by the high-pressure of the water in the accumulator (which is
pressurized by the N2 gas flowing from the H
2
O CONFINING PRESSURE regulator and
FLOW METER).
Pore Pressure gauge
This 0 – 3000-psig (0 – 20700-kPa) dial pressure gauge indicates the PORE PRESSURE at
the top of the cement sample column in the CHA Vessel.
H
2
O Purge valve
This 2-way (open/closed) manual needle valve is used to hold pressure and contain fluids in
the CHA Vessel or allow release of the PORE PRESSURE from the top of the cement
sample in the CHA Vessel. This valve is opened during test setup, to fill the PORE
PRESSURE gauge and tubing up through this valve with water, purging any air from that
portion of the instrument. It is also opened to relieve pressure from the CHA Vessel and
instrument at the end of a test, before disassembly or removal of the CHA Vessel and Stand.
During the test, this valve must be closed to contain the PORE PRESSURE at the top of the
cement sample in the CHA Vessel.