초록 ▼

A method and apparatus for quickly determining leakage in pressurized fluid receptors. Pressure determinations are made substantially immediately following the completion of the filling of the item to be tested with the pressurized fluid without the need for a stabilization period. The complete deca

A method and apparatus for quickly determining leakage in pressurized fluid receptors. Pressure determinations are made substantially immediately following the completion of the filling of the item to be tested with the pressurized fluid without the need for a stabilization period. The complete decay curve is calculated from the pressure determinations. A time constant is determined from the curves defined when no leakage is present and is utilized in determining the leakage rate whenever the two curves defined by the pressure points provide different end pressure values. The determinations may be made by conventional microprocessor-based instrumentation to provide a substantial increase in the rate of conducting fluid leakage tests.

대표청구항 ▼

The method of testing fluid receptors for leaking comprising the steps of: providing pressurized fluid into a chamber of the fluid receptor; isolating said chamber subsequent to provision of the fluid thereinto; sensing the pressure of the fluid in said isolated receptor; sequentially determining th

The method of testing fluid receptors for leaking comprising the steps of: providing pressurized fluid into a chamber of the fluid receptor; isolating said chamber subsequent to provision of the fluid thereinto; sensing the pressure of the fluid in said isolated receptor; sequentially determining the sensed pressure at at least four different times during a stabilization period following the isolation of the chamber during which period the pressure in said isolated chamber changes exponentially due to a stabilization of the pressurized fluid therein toward a substantially constant value; calculating from a first group of at least three successive pressure determinations a first end pressure to which the fluid pressure should change after infinite time and calculating from a second, subsequent group of at least three successive pressure determinations a second end pressure to which the fluid pressure should attain after infinite time; comparing said first and second calculated end pressures and determining a differential therebetween; determining a characteristic of the exponential curve defining the rate of the pressure change due to the stabilization of the pressurized fluid; and calculating the leak rate from the value of the determined characteristic and the determined pressure differential.