Patent ID: 9297466
Filing Date: 2016-03-29
CPC Classification: E21B,F16K,F16L,Y10T

Claim Text:
1. A safety device for an oil or gas installation, said installation comprising one or more conduits for the transport of oil or gas, or one or more valves, wherein the safety device comprises: a first freezing device for forming a closing ice plug, which first freezing device comprises a spraying device that is configured to spray a freezing medium into the conduit or into the valve; and a second freezing device for maintaining the closing ice plug; wherein the first freezing device is substantially positioned in or around the conduit or the valve; wherein, in operation of the safety device, the first freezing device cools the conduit or the valve to such an extent that a closing ice plug is formed in the conduit or the valve by the freezing of a medium in the conduit or the valve; and wherein the second freezing device comprises a closed conduit device for transporting a freezing medium, and, in operation of the safety device, during a first time period the freezing medium is sprayed by the first freezing device in order to form the closing ice plug and during a second time period the formed closure is maintained by the second freezing device, and wherein during the second period the spraying of the freezing medium is halted.