METHOD FOR TESTING OF PNEUMATIC SYSTEM AIR-TIGHTNESS Russian patent published in 1997 - IPC

FIELD: instruments. SUBSTANCE: method involves putting space ship to vacuum-chamber, which is connected to leakage detector, connecting vacuum chamber to inner chamber of compartment, pumping vacuum chamber and compartment down to minimal rest pressure of vacuum chamber, pumping weighed flow of testing gas of Q_tw to compartment, measuring change in concentration ^∧C_tw(com) of testing gas in vacuum chamber with respect to weighed flow which is supplied to compartment, finishing supply of weighed flow of testing gas of Q_tw to compartment, starting supply of this weighed flow to vacuum chamber, measuring change in concentration ^∧C_tw(vac)(c) of testing gas in vacuum chamber with respect to weighed flow which is supplied to vacuum chamber, when vacuum chamber and inner chamber of compartment are connected, disconnecting vacuum chamber and inner chamber of compartment, measuring change in concentration ^∧C_tw(vac)(d) of testing gas in vacuum chamber with respect to weighed flow which is supplied to vacuum chamber, when vacuum chamber and inner chamber of compartment are disconnected, finishing supply of weighed flow of testing gas of Q_tw to vacuum chamber, connecting vacuum chamber and inner chamber of compartment anew, filling pneumatic system with testing gas, measuring change in concentration ^∧C_syst(c) of testing gas in vacuum chamber caused by small-scale leakage in units and pipes of pneumatic system when vacuum chamber and inner chamber of compartment are connected, disconnecting vacuum chamber and inner chamber of compartment, measuring change in concentration ^∧C_syst(d) of testing gas in vacuum chamber caused by small-scale leakage in units and pipes of pneumatic system when vacuum chamber and inner chamber of compartment are disconnected. This results in possibility to judge pneumatic system air-tightness Q_syst by ratio of measured values. EFFECT: increased precision of testing.