Arrangements made to continue pumping out stored water
With the water level at Mettur Dam continue to recede below 30 feet, pumping of water to the A.V. Raman Valve Tower is still carried out by three submergible motors and one horizontal centrifugal motor.
The three powerful electric motors at the tower, two with 135 HP capacity and one with 175 HP capacity, pump about 21 million litre of raw water from the dam and convey it to the online booster station at Karumalai Koodal through two pipes.
The process was carried out since the tower’s inception in 1952. However, when the water level at the dam falls below 30 feet, raw water does not reach the tower for pumping and water has to be fed into the tower’s tank.
Hence by installing motors at the dam, water is pumped and fed into the tank. Officials said that the system was earlier followed in 1986 and 2002, when the dam level was too low for drawing water.
“It is almost two months now that water was drawn and fed in the tank for pumping. If a motor is non-functional, back up motor is already in place and hence we can ensure continuous supply,” added the official.
Officials said that with the pulling power of the 135 HP capacity motors fallen, one was replaced with 175 HP capacity motor on Thursday and the other would be replaced shortly.
They added that if the water level continues to recede, submergible motors will continue to function and there would be no hindrance to the water drawing capacity.
The scheme was initially designed for 12 MLD in 1952 but the motors were upgraded in 1980 for drawing additional quantity of 15 MLD.