PACKAGE : I Bid Document VOLUME : II - Public Health Engineering

19.9 Packing for Transportation.
All parts shall be properly boxed, crated or other wise protected for transportation
and handling. Exposed machine finished surfaces shall be thoroughly greased
before packing.
The Bidder shall fill up the check list and submit with the offer.
19.10 Technical specification for the drive motors.
1. Codes & Standards : The motors shall be conforming to the following IS
specification :
IS : 325, 2223, 1231, 4691, 2540 & IEC : 34 & 72 : AC induction motor.
2. Electrical System :
Voltage : 6600 V, 10%
Frequency : 50 HZ 5
%
Combined variation : 10%
AC Supply
System Neutral : Directly earthed
3. Design & Operational requirement :
The drive motor shall be squirrel cage, induction type with vertical solid shaft
having a degree of protective of IP – 55 with CACA, self radial ventilation type
encloser. The rating of the motors shall be selected considering the max BKW of
the pumps at 6%
frequency variation. As the pump is designed to develop the
required pressure at a speed of 1400 Rpm corresponding to a motor speed when
connected to a power system with a frequency of 47.50 Hz., the motor capacity
shall have ample margin of power to take care in the event of sudden increase in the
input power to pumps, when speed suddenly shoots up as a result of sudden
fluctuation in the frequency of power system to the upper limit of 51.50Hz. In
worst operating condition whichever is higher subject to the condition that the
above rated motor shall satisfy the requirement of the pumps at all working
conditions otherwise higher rating motor should be selected to satisfy the demand.
Adequacy of motor power shall also be checked with the pump input power
required during solo pump operation in the event of tripping of the other pump(s)
operating in parallel. The motors shall be suitable for rotation in both direction.
DTS : Detailed Tender Specification. Page 194