Turbine Runner & HVOF Coating

TURBINE REPAIR & HVOF COATING Shop at HEW was established in April, 2008, in technical collaboration with a Swiss Company, for repairing & refurbishing of Pelton Wheel Runners of 100MW capacity, a number of which is being used for generating power in the Hydro Power Plants at BASPA (H.P) and VISHNUPRAYAG (Uttarakhand), which are owned by Jaiprakash Power Ventures Ltd.

This repairing is done by grinding off the cavities formed on the Runner Buckets, followed by filling with special welding & machining on 5-axis device, supplemented by grinding efforts followed by Tungsten Carbide coating carried out thru’ HVOF Process, by a 6-axis operated Automatic Robot, which increases the life of the Runners by 300%. A properly repaired & coated Runner will last three (3) seasons, whereas an uncoated Runner will not last more than one (1) season.

Till date, HEW has repaired & recoated about 38 Runners belonging to both the above sites so far. Presently we are turning out at least Eight (8) nos. Runners per year, duly repaired & coated and are aiming at increasing our capacity to Ten (10) Runners per year.

Now onwards, HEW is developing facilities for separate dedicated HVOF coating of water eroded Francis Turbine runners, for which a new coating chambers in under commissioning.