Patent ID: 6547435
Filing Date: 2003-04-15
Classification: F17D,G01M

Abstract:
Device for monitoring a temperature distribution or temperature anomalies of at least one pipe surrounded by an annular space for underground gas accumulators in a longitudinal direction of the at least one pipe, wherein the at least one pipe is in the form of an ascending pipe or a supply pipe, the device comprising:a fiber-optic sensor cable freely suspended in an interior of the pipe; the fiber optic sensor cable having an outer end passed via a pressure-proof sealing to an exterior of the at least one pipe; a measuring unit for feeding radiation impulses and for receiving a Raman backscatter radiation, wherein the outer end is connected to the measuring unit; a device for a temporary relief of pressure in at least one of the annular space and the pipe, wherein a first temperature profile is determined before the temporary relief of pressure and a second temperature profile is determined after the temporary relief of pressure, and wherein leakage is evaluated based on a difference between the first and second temperature profiles.