Cause analysis of oil leakage from bearing boxes of boiler auxiliaries and remedial method thereof have been analysed and summarized

emphasizing the method for improving the structural design of packing units. It is considered that the design and installation of built-up labyrinth packing

oil-retaining ring plus oil-introducing ring

as well as stationary combined packing unit to be simple and convenient

needing no adjustment

having good sealing effectiveness

basically not requiring maintenance

being worth to be popularized.