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

Chapter 23
Technical specification for electro-mechanical Plants,
equipments and accessories for Clear water pumping station.
23.1 Intent and Requirement.
Intent :
The intent of the tender is to select, manufacture, testing at Manufacturers’ works,
supply and delivery in duly packed condition F.O.R project site, installation,
commissioning of horizontal split casing pumping sets with accessories installed in
the Clear Water pumping station with other equipments, field testing, operation and
maintenance etc. as per the technical specification and other terms and conditions.
The horizontal split casing Clear Water pumping sets shall be installed to lift
4.36Mld of water to the storage reservoir under Zone XII.
Source and Pump House :
The source of water shall be the storage reservoir at 6 th Mile, Upper Shillong which
shall receive and collect the water transmitted from the WTP which is about 13Km
away. The Clear Water RCC Sump and Pump House is proposed to be constructed
near the storage reservoir. Horizontal split casing pumping sets shall be installed in
the Pump House. Under the scope of this tender the electrical control switches
H.T/L.T. Board, indication and metering, instrumentation etc. shall be housed in the
Pump House to be constructed for the purpose.
Present Phase and Future Phase Requirement :
There shall be total 2 nos. horizontal split casing pumps of identical type for the
present phase and the same shall be operated as one pump and shall deliver the
station flow of 4.36 MLD in 20 Hrs. of operation by 1 pump. Raw water shall be
transported from the Clear Water pumping station to the storage reservoir for Zone
XII through a 300mm DI rising main pipe having approximate length of 6570Rm.
The different levels in the proposed RCC Sump at clear water pumping station and
the storage reservoir of Zone XII 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 Clear Water rising Main an increment of
20% on the calculated frictional head loss of the rising main shall be considered.
DTS : Detailed Tender Specification. Page 271