Installation for controlling the sealed condition of water-gas heat exchangers for industrial furnaces

An installation for leak testing water/gas heat exchangers fitted to an industrial furnace, said furnace having at least one assembly formed by means for extracting hot gas present in a given zone of said furnace, a water/gas heat exchanger for cooling said hot gas, and a reinjecting device for reinjecting said cooled gas into a zone of said furnace situated downstream from said zone from which said hot gas was extracted, the installation, comprising:

• a first sampling device for sampling said hot gas at a first plurality of points each situated upstream from a heat exchanger and two-port valves allowing said sampling to be performed;
• a second sampling device for sampling said cooled gas at a second plurality of points each situated downstream from a heat exchanger and two-port valves allowing said sampling to be performed;
• a regulating device for regulating the respective pressures of said hot gas and said cooled gas downstream from said sampling devices;
• a three-port valve for selecting said hot gas or said cooled gas and applying the selected gas to a hygrometer;
• and
• a device for informing an operator of the results of an analyses performed by the hygrometer and for enabling the operator to compare the degree of humidity of said hot gas and of said cooled gas for each of the heat exchangers.