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

Chapter 19
Technical specification for electro-mechanical plants,
equipments and accessories for Raw water Intake pumping
station.
19.1 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 vertical wet pit type pumping sets with accessories to be mounted
on the Raw Water Intake Well and Gangway along with other equipments, field
testing, operation and maintenance etc. as per the technical specification and other
terms and conditions. The vertical wet pit type Raw Water pumping sets will serve
as the intake pumps of the 8 MLD water treatment plant of GSWSP Phase III.
Source and Pump House :
The source of water shall be Umiew Dam reservoir of Greater Shillong Water
Supply Scheme, Intake well cum Pump house is proposed to be constructed at the
reservoir bed in the identified location at some distance from the bank. Vertical
pump sets shall be installed in the intake well of R.C.C. construction within the
water body of the reservoir, mounting the same on the floor of the Intake well cum
Pump House connected through a gangway of 4m width to be constructed from the
bank. 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 3 nos. vertical wet pit pumps of identical type for the present
phase and the same shall be operated as two pumps in parallel conditions of any
combination and shall deliver the station flow of 8 MLD in 20 Hrs. of operation by
2 pumps. Raw water shall be transported from the intake pumping station to the
intermediate stage pumping station through a requisite size MS rising main pipe
having approximate length of 750Rm.
DTS : Detailed Tender Specification. Page 181