Operating instructions

INTRODUCTION
1-4 15 Apr 11
ACD-1500Degasser
MAJOR COMPONENTS
The degasser (Figure 1-3) consists of a spray tank, electric motor-driven centrifugal pump, impact
plate, electrical control panel (optional), vent, and exhaust blower. These components are
described in the following paragraphs.
Spray Tank
Fluid dispersed at high velocity by the impact plate spreads across the interior surfaces of the
spray tank. The tank’s shape encourages release of entrained gas from the mud.
Centrifugal Pump
Fluid is drawn into the degasser from the bottom of the mud tank by the centrifugal pump. The
pump is driven by the main electric motor at the top of the degasser through a gear unit that
transmits the motor’s rotation to a shaft extending downward to the pump. The shaft is supported
by two bearings that control the shaft movement in both axial and radial directions. Clamping
collars installed on the shaft ensure that minimal thrust is applied to the vertical shaft.
Impact Plate
Fluid pumped upward through the riser by the centrifugal pump strikes the circular impact plate,
which disperses the fluid horizontally into the spray tank. Its slotted mounting holes permit vertical
positioning of the impact plate to vary the gap between the top of the riser and the plate. Serrated
tabs ensure positive setting of the gap at six locations. After properly positioning the impact plate,
tightening the attaching hardware secures the plate to a fitting at the top of the spray tank.
Electrical Control Panel (Optional)
If equipped with an electrical control panel, three-phase AC electric power is connected inside the
control panel to supply power to the main motor and exhaust fan motor. If equipment is supplied
without the control panel, electrical connections are terminated at the main motor and fan motor.
A customer-supplied starter box must then be connected to the motors to supply power.
In addition to the START and STOP switches used to turn the machine on and off, the optional
control panel contains a power contactor, provisions for connecting external controls and
indicators, and other electrical components. Both motors are protected by thermal overloads to
shut down the power in case of excessive current draw.
Vent
Aided by the exhaust fan, liberated gas flows upward through the vent and exits the flange at the
top of the vent. A backdraft damper on the outside of the vent pipe permits entry of ambient air to
mix with the gas and facilitate gas extraction. Opening of the damper is facilitated by the exhaust
fan.
Exhaust Blower
The exhaust blower aids in removing potentially hazardous gases from the degasser. The outlet
flange should be connected to a suitable pipe to convey the liberated gases to a safe location.