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

Characteristic curves:
Characteristic and system curves for the pumps shall be supplied to a reasonably
large scale which shall show the capacity of the pumps under single and multi
pump operation at the duty point.
When tested through their complete range of workable heads at the maker's works,
all the pumps shall give results which conform to the curves submitted with the
Tender. Curves showing pump efficiency and kW. loading shall also be included.
Performance test:
Each pump shall be tested at the manufacturer’s premises for the full operating
range of the pump. Pump performance shall be within the tolerance limits specified
in the relevant standards. The contractor shall furnish the guaranteed values of
discharge and efficiency for the total head at duty point for each pump.
Electric Motors.
Supply Voltage and Characteristics for Motors:
All unless otherwise specified, LT motors shall be squirrel cage motor and the
motor shall be suitable for the following.
Supply voltage : 415 Volts, 3 Phase, 50 Hz AC
supply
Voltage variation : 10%
Frequency variation : 5%
Combined variation of Voltage & Frequency : 10%
All motors shall be foot / flange mounted squirrel cage induction type and shall be
capable of developing at least 10% more power than demanded by the pump or
driven equipment over its entire range of safe operation.
Motors shall be continuous maximum rated as per IS:325 and IS:4722 (latest
edition) and preferably be designed for low starting current and smooth acceleration
except for cases where the driven equipment characteristic demand otherwise.
Motors shall be of 4/6/8 pole design fitted with ball .roller bearings and provided
with one or more terminal boxes large enough to accommodate armoured PVC
insulated aluminium conductor of appropriate ratings.
GTS : General Technical Specification. Page 154