Schlumberger Industries

Solutions Services Systems France S.a.

Jean-Pierre Campain

Sylvain Janssen

Jacques Fournier

Gerald Marcy

Bernard Dumont

Sylvan Janssen

Degassing system for a hydrocarbon dispenser

A metering system, for metering a volume V.sub.o of compressed gas supplied under high pressure from a first tank to a second tank, includes a first duct for supplying the compressed gas from the first tank to the second tank, the first duct having a pressure regulator providing a relatively high driving pressure P, and a first nozzle having a section S with an inner diameter located downstream of the pressure regulator and providing a downstream pressure p therefrom, the pressure regulator being controlled by the downstream pressure p to maintain driving pressure P so that the downstream pressure p remains less than 0.95 P. A second duct branches at one end from the first duct between the pressure regulator and the first nozzle and includes a second nozzle having a section s with an inner diameter smaller than the inner diameter of the section S of the first nozzle. An outlet of the second nozzle is maintained under relatively low pressure conditions, and a volume meter is connected to the outlet of the second nozzle for metering under low pressure conditions a volume v.sub.o of gas flowing through the second duct. The volume V.sub.o which flows to the second tank under such low pressure conditions is determined by V.sub.o =v.sub.o (S/s).

System for metering gas supplied under high pressure

The efficiency of hydrocarbon vapor recovery installations used in gas stations is measured. A system for measuring a yield of recovery for hydrocarbon vapors emitted from the tank of a vehicle as it is being filled comprises at least one box for carrying a nozzle inside and for placement over a filler neck of the tank. The nozzle is connected through a conduit to a device for evaluating the recovered hydrocarbon vapor, wherein the recovered vapor evaluation device is a gas meter and a following orifice.

System for measuring the efficiency of hydrocarbon vapor recovery

A tubular device is slid over a delivery nozzle hose. A hose connects the tubular device to a gas meter. As fluid is expelled from the nozzle into the atmosphere, atmospheric air is sucked into the gas meter so that its volume can be measured for comparison with the volume of the expelled fluid.

Method and apparatus for measuring the volumetric efficiency of systems

A positive-displacement fluid flow measuring system, especially for hydrocarbon fuel dispensers. The measuring system comprises, in addition to a positive-displacement meter per se, a correction system for correcting the loss of head in the meter. The correction system comprises a differential pressure detector responsive to the difference between the pressures at the inlet and the outlet of the meter. The displacement of the membrane enables an external motor to be coupled to the shaft of the meter by means of the plates.

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Clamart, France

Jean-Pierre Campain