PROCESS TESTING TIGHTNESS OF HEAT INSULATING CRYOSPACE AND GEAR FOR ITS IMPLEMENTATION Russian patent published in 1998 - IPC

FIELD: cryogenic technology, test of vacuum systems for tightness. SUBSTANCE: cryospace is vacuumed to specified vacuum depth at constant rate of pumping. Tightness test is carried out by way of comparison of current pressure P₂ with specified vacuum depth P₁. During comparison cryospace is vacuumed with pumping rate S, where S=Q_o•K/P₁,, Q_o is permissible flow of inleakage at working vacuum depth, Pa•m³/s; Q₁ is inleakage flow at pressure P₁ in tight cryospace, Pa•m³/s; coefficient K = Q₁/Q_o. Pressure in cryospace either grows which indicates lack of tightness or decreases which indicates tightness. Gear for implementation of process includes vacuum pipe-line having two parallel lines, one of them housing diaphragm of carrying capacity and the other one - shutting fittings. Vacuum gauge is arranged in pipe-line that connects pumping means with cryospace. EFFECT: enhanced reliability of process and efficiency of gear. 2 cl, 2 dwg