standards / manuals / guidelines for small hydro development - AHEC

v) History registers of various machines duly recorded with all the abnormalitiesobserved on the machine and details of action taken to provide a guide line for futuremaintenance exercise must be maintained at the power station.vi) Logging of the performance characteristics of the power plant on daily basis recordingall the abnormalities and misbehaviors (if any) of the total plant observed during itsgeneration programme from one maintenance exercise to another.4.0 GUIDELINES FOR MAINTENANCE OF SMALL HYDROPOWER STATIONSIn most of small hydro plants preventive maintenance approach is preferred over otherapproaches. Following inspection checks are done in this type of maintenance:• Daily checks• Weekly checks• Monthly checks• Quarterly checks• Half yearly checks• Annual inspection and maintenance of components of plants• Capital Maintenance4.1 PREVENTIVE MAINTENANCE OF HYDRO TURBINE & AUXILIARIES4.1.1 Daily Checks1. Foundation parts and Expansion Joints:• Checks for any leakage in draft tube manholes, spiral casing manhole, expansionjoint.2. Vaccum Breaking Valve:/ Air Admission Valve• Checks the working of both vaccum breaking valve and see that there is noabnormality in the springs, seats etc.3. Water Seal and Air Seal:i) Checks the position of water leakage of the water seal and see that there is noexcessive splashing and water level do not rise in top coverii) Note water pressure of water sealing /under sealing.4. Turbine Guide Bearing:i) Checks the oil level(stand still machine /running machine)ii) Note the temp. of bearing and check that the temperature of oil and guide beaing padsare within limits.iii) Note the maximum and minimum temperature and compare with readings of theprevious day.iv) Checks for any oil leakage from the bearing housing and check that oil is flowingabove the bearing pads.5. Guide Apparatus:• Check any leakage from GV servomotor and its pipingAHEC/MNRE/SHP Standards/ E&M Works – Guidelines for Operation and Maintenance of Small Hydropower Station 17