Heat-exchanger group of BHEl Bhopal is manufacturing double tubed type Oil Forced Water Forced (OFWF) type Coolers for use in Transformers. These are designed and manufactured with special care for cooling of transformer Oil and prevent mixing of water in oil under any circumstances ie even in case of any tube failure. Hence the application is very critical. This is the most efficient & reliable cooling system for transformers.
HCM division has implemented new creative ideas & has put in effort to ensure manufacture and supply of quality & reliable double tubed OFWF Cooler. In this process special profiled ferrules are passed sequentially in the increasing order of their sizes to ensure smooth & uniform tube expansion throughout the length thus ensuring uniform metal to metal contact between inner & outer tubes.
Apart from ensuring the metal to metal contact of inner tube in outer tube by ferrule expansion, HCM group has also developed process to carry out the functional test to assess the heat transfer in the fluids flowing on tube side & shell side. This test is carried out by pumping water from both shell & Tube side of this exchanger. In this process temperature changes in the two fluids are measured using thermo-couples & the temperature variations are recorded in the recorder. This testing is witnessed by the representatives of manufacturing group, engineering & Quality Control.
These pro-active efforts by the team of quality circle no. 617 under the guidance of HOD manufacturing & engineering, has helped in ensuring supply of quality products and enhancing confidence in the products supplied.