A method for detecting loss of SF6 gas from electrical utility apparatus determines a molar ratio of gas in a container at an initial time and of gas in the container at a subsequent time. Measurement of temperature is determined by averaging ambient temperature and temperature of the surface of the container. The initial values of pressure and temperature define the initial value of n as follows: n.sub.o=P.sub.gas o/T.sub.gas o The value at a subsequent time is n.sub.n=P.sub.gas n/T.sub.gas n T...

A method and apparatus of diagnosing leakage in a fluid power system including a fluid supply line operatively connected to a plurality of valves which are connected to a plurality of actuators. Flow signals generated by a flow sensor disposed in the supply line are processed to obtain fluid consumption over time values and signals used to change the state of the plurality of valves are processes to determine a plurality of episodes. Each of the plurality of episodes corresponds to a pressurizat...

A method for determining the presence of a leak in a water heater unit comprising a storage tank is presented. The present invention involves mounting one heating sensor on the lower half of the tank and another heating sensor on the upper half of the tank. Readings from both sensors are taken and compared to determine if the water heater tank has reached a steady state; if so, the cooling rate of the tank is determined. This cooling rate is compared to the historical natural cooling rate of the...

A leak detecting system for a transpiration purge system including a fuel tank 1 and a canister 13 includes a jet pump 8, which leads the atmosphere into the fuel tank 1 using a return flow of excess fuel of fuel pumped to an internal combustion engine, internal pressure measuring means 15, and fuel volume detecting means 18. After intaking air via pressurizing means for a predetermined time, the leak detecting system judges that a leak is present when a holding pressure measurement value in a s...

Apparatus for performing leak testing on products is disclosed. Specifically, the present invention includes a method, system, and apparatus for performing an adaptive leak test on products under test.

A first mirror and a second mirror are disposed in such a manner that their reflective surfaces are parallel and face toward each other. A mark is drawn between the first mirror and the second mirror. An image of the reflections of the mark in the first mirror and the second mirror is captured with a camera. Calibration of the camera system is performed based on the image.

The present invention relates to a sensor apparatus configured to detect the presence of a gas, such as a tracer gas and a leak detection apparatus configured to detect the presence of a tracer gas and indicate the location of a leak. The leak detection apparatus may further be configured to quantify the leak rate at the leak location.

A cutting tool whose surface is coated with a composite hard layer formed by chemical vapor deposition and having excellent wear resistance and chipping resistance. The cutting tool contains a substrate whose surface is coated with a composite hard layer containing an inner layer including one or more layers of titanium carbide, titanium nitride, titanium carbonitride, titanium carboxide, and titanium oxicarbonitride, and an outer layer including at least one alumina layer. The alumina layer con...

A method of performing normal moveout (NMO) correction and stacking of a common-midpoint (CMP) gather of seismic traces in a manner that avoids NMO stretch is disclosed. A CMP gather without NMO correction is modeled as the sum of a series of short overlapping time intervals whose center times follow the NMO curve as it changes with offset. The sample values contained in these intervals are solved simultaneously by performing a statistical fit to the CMP gather based on this model. A CMP stacked...

A lost motion link for allowing selective control of the throttle valve of a vehicle engine between accelerator pedal linkage and speed control system linkage comprises: an elongated body having an enclosed longitudinal passage dimensioned to receive an enlarged cable terminus, an integral flange for pivotally mounting the body to the throttle valve actuator, and a restricted portion of the longitudinal passage entraining the terminus in the body.