Method and system for detecting and locating pipe line leakage

Claim 1

A SYSTEM FOR DETECTING AND LOCATING LEAKAGE IN A BURIED PIPE LINE INSTALLATION INCLUDING A PRODUCT CONVEYING PIPE AND A CASING SURROUNDING SAID PIPE IN CONCENTRIC SPACED RELATION TO PROVIDE AN ANNULAR SPACE BETWEEN SAID PIPE AND SAID CASING, SAID SYSTEM COMPRISING A PLURALITY OF STAND PIPES SPACED LONGITUDINALLY OF SAID INSTALLATION, EACH STAND PIPE BEING CONNECTED TO SAID INSTALLATION, MUNICATION WITH SAID SPACE AND EXTENDING TO GROUND LEVEL, AN AIRTIGHT REMOVABLE COVER FOR EACH STAND PIPE, A VAPOR SENSITIVE SWITCH IN EACH STAND PIPE ADJACENT SAID SPACE, AN INDICATING MEANS IN EACH STAND PIPE ADJACENT SAID INDICATOR, SAID SWITCHES SERVING TO ENERGIZE SAID INDICATING MEANS AND SAID CENTRAL INDICATOR, A COMPRESSED AIR SUPPLY CONDUIT CONNECTED TO SAID SPACE, A PRESSURE REDUCING VALVE IN SAID CONDUIT, A BY-PASS AROUND SAID REDUCING VALVE, A SHUTOFF VALVE IN SAID BY-PASS, A DRAIN TANK, A DRAIN PIPE CONNECTING SAID SPACE AND SAID TANK AT A POINT LONGITUDINALLY SPACED FROM THE CONNECTION OF SAID SUPPLY CONDUIT, A SUMP, A DISCHARGE FROM SAID TANK TO SAID SUMP, A FLOAT VALVE IN SAID TANK FOR CONTROLLING FLOW OF LIQUID FROM SAID TANK TO SAID SUMP, AN AIR LIFT PUMP IN SAID SUMP, A PRESSURE RELIEF VALVE CONNECTED TO SAID TANK ABOVE THE LIQUID LEVEL AND AN AIR PIPE CONNECTING SAID RELIEF VALVE AND SAID SUMP.