DEVICE FOR DETECTION OF CHANGE OF PRESSURE IN PIPE LINE Russian patent published in 1999 - IPC

FIELD: instantaneous contanctless obtaining of information pertaining to unauthorized changes of pressure in oil and gas transportation pipe lines. SUBSTANCE: device has takeoff unit consisting of pipe union connected with space of pipe line, shut-off member connecting pipe union with takeoff tube and measuring instrument. Takeoff unit is located at the beginning or at the end of pipe line. Free end of takeoff tube is blanked off and surrounded with shield having hole. Located opposite this hole is hole of shielded unit inside which detector is mounted under hole; this detector is connected with measuring instrument located beyond shield unit. Detector may be connected with measuring instrument through measuring circuit whose elements are shielded against detector and surrounding medium to protect it against effect of uniform not to be monitored. Hole of shielded unit should be sealed up to ensure stable operation of detector and measuring circuit connected with it. EFFECT: avoidance of use of expensive materials, special consumption of power and assembly jobs; enhanced reliability and sensitivity of measurements. 3 cl, 3 dwg