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

The different levels in the reservoir well and the proposed RCC Sump at
intermediate stage pumping station have been indicated in the document based on
which the Bidder shall calculate the pump working heads at different conditions. To
calculate the frictional head loss in straight pipe, Hazen William’s formula taking
‘C’ value as 100 shall be considered. In order to estimate the frictional head loss for
bends, curves, valves, specials etc. in the Raw Water rising Main an increment of
20% on the calculated frictional head loss of the rising main shall be considered.
The system may also demand for solo pump operation in varying level conditions of
the reservoir and the pumps shall be suitable for solo as well as parallel operation.
The pump duty point shall be considered at the individual pump flow of the
combined station flow by 2 pumps working at lowest water level 1562.00m of the
reservoir which shall lie at 0.5m above the C/L of inlet port to be fixed at
1562.50m. However the pumps shall be suitable for continuous operation both solo
and 2 pumps in parallel mode at the above LWL condition and maximum HWL
condition of the reservoir at 1577m and in between.
The intake well cum pump house shall have a provision of installing 3 more vertical
pump sets so as to feed the raw water to the additional Water Treatment Plant to be
constructed adjacent to the present one. The existing rising main of 500mm dia.
shall transport the raw water in the present and future demand. Thus in future, there
shall be an additional pump battery of 3 pump sets having 2 working and 1
standby system to take feed of raw water from the proposed single intake well to
meet both for the present and future demand as stated above.
19.2 Scope of electro-mechanical works.
The Scope of Work covers selection, manufacture, testing at manufacturer’s works,
supply and delivery to store at project site properly packed for transportation on
F.O.R site basis, receiving at store and site including loading and unloading at all
terminal points, safe storage, installation, pre-commissioning activities, trial run,
commissioning, field testing, operation and maintenance for a period of 3 months of
the plant with all associated equipments and ancillaries. All electro-mechanical
components of the pump house including pumps, motor, starters, H.T./L.T. Panel
boards, pipes, valves and specials, overhead crane and trolley etc. shall be under the
scope of this tender. Both suction and delivery valves inside the pump house shall
be butterfly valves with motorized actuator and position indicator. Arrangement of
feeding H.T./L.T., 3 phase A.C. Power supply to the H.T./L.T. Panel Board in the
Pump House shall not however be under the scope of this tender and the same shall
be arranged separately by the employer/owner. Civil construction of the intake well,
pump house and gangway over the reservoir from the bank to the pump house
DTS : Detailed Tender Specification. Page 182