standards / manuals / guidelines for small hydro development - AHEC

Sl. No. Description Periodicity Remarksdry.6.02 Check the gasket between oil cooler & oil Yearlybath & between air cooler & stator frame.Gaskets to be replaced if required.6.03 When the shutdown exceeds 10 days, water As requiredfrom coolers is to be drained and the coolerskept dry.6.04 Coolers are to be immediately attended to as On flooding of This is to safe guardgiven above at 6.03.the unit. failure on subsequentcommissioning of the6.05 Normally upto 10% of the cooling tubes ofcoolers can be plugged, if required.7.00 UPPER BRACKET / LOWER BRACKETAs requiredunit.Temperature of thebearing pads/ statorwinding to be taken inview while pluggingtubes of the coolers.7.01 External inspection & tightening of the lock Once in 3nuts in the radial jacks, if required.months7.02 Check fixing of the generator cover plate Once in 3months7.03 Check all fasteners of Upper and lower air Once in 3baffles.months7.04 Check the value of air gap between air YearlyThese gaps are to bebaffles and rotor.compared withoriginal values duringerection andmaintained as such, ifrequired.7.05 Clean the brackets of dirt & dust. Yearly Cleaning can be donemore often if possible.7.06 Check fastening between upper bracket & Yearlystator and foundation plates.7.07 Check foundation bolts tightening for stator Yearly& lower bracket.7.08 Check all fasteners for locking / tightness Yearly8.00 Brake pipe line8.01 Record air pressure available at brake panel. Every shift Record on log sheet8.02 Check thickness of brake pad As required Record to bemaintained along withnumber of braking inthe period with Airpressure used forbraking.8.03 Measure:i) Time for unit to come braking speedDuring firstspinning / yearlyRecord be kept. Incase if this time hasAHEC/MNRE/SHP Standards/ E&M Works – Guidelines for Operation and Maintenance of Small Hydropower Station 32