12
5 ALTERNATIVE HYDRAULICS
5.1 Alternative Schlumberger hydraulics (Figure 23)
As described in the Certificate but having all the Tatsuno hydraulic units replaced by
Schlumberger PAS hydraulic units. This hydraulic unit comprises a motor driven pumping
unit. with integral air separator and gas detector. feeding two meters and associated nozzles.
The maximum flowrate is approximately 55 litres per minute.
5.1.1 Pumping unit
Fuel is drawn in via a filter. through a check valve, into the rotary gear pump and then passes
through an air separating vortex. Fuel with a small amount of entrapped air then passes to the
main air separation chamber. Any remaining air is vented to atmosphere via an air vent check
valve and fuel is passed to the nozzle.
If the amount of air entrapped in the fuel passing through the pumping unit is greater than a
predetermined value the gas detector operates and causes the fuel flow to cease.
This pumping unit may be fitted in conjunction with any meter described in this certificate.
5.1.2 Meter
The Schlumberger SMIOO meter consists of two pistons which move horizontally and
transmit their movement to the pulser by means of crank pins. The meter adjustment is made
by adjusting the stroke of the pistons at one end. The meter adjustment wheels are covered and
sealed. The meter has a drive ratio of two revolutions per litre.
5.1.3 Pulser
As described in section 2.6.2.
5.1.4 Sealing (Figure 24)
5.1.4.1 Meter
The meter is sealed by means of a wire which passes through a loop in the serial plate, then
through a hole on the top cover and through concentric holes on the meter body and back
cover. It then passes through a hole in the meter body, a hole in the bottom cover. to the other
side of the meter and passes back to the loop in the serial plate. via a similar route described
above. and is then drawn taught and sealed.
A second wire passes through a screw on the cover of the calibration wheel and then through a
hole in the cover itself. It is then drawn taught and sealed.
The meter and pulser assembly are also sealed to a horizontal plate. A wire passes through all
the assembly fixing screws and a separate screw fixed to the plate. it is then drawn taught and
sealed.
(98 paginas)
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