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

Sterilisation : For sterilisation of the filtrate, chlorination with chlorine solution is
used.
The details of existing installations for all the six filters of 34.05 Mgd water
treatment plant are indicated below:
1. Raw water.
i) 600mm G.I. Flanged tail piece grouted into stilling chamber. 1 no.
ii) Flow meter comprising Mahindra Flow Transmitter having local
mechanically operated dial indicator and remote reading indicator
recorder and continuous integrator, remote instruments located in the
annunciator panel in the chemical house. 1 set
iii) MS shutter for shutting off flow to flash mixer and bypassing raw
water to filter inlet channel direct. 2 nos.
2. Chemical equipment
i) Alum agitator paddle of hardwood mounted on MS vertical shaft
suspended from gear box and rotating below in a GM bush grouted
into alum tank floor. Shaft driven through gearing by electric motor,
complete with starter. The details are : 2 sets
iii) 50mm C.I. rubber lined diaphragm valve for solution and sludge. 4 nos.
iv) PVC header pipe interconnecting solution outlets and connected
through PVC piping or rubber hose to dosing tank. 1 range
v) PVC header pipe interconnecting sludge outlets and connected
through PVC piping or rubber hose to drain. 1 range
vi) Stainless steel 50mm inlet float valve with PVC float and adjustable
stem for maintaining a constant level in the dosing tank at any preset
head 2 nos.
vii) Stainless steel taper needle valve operation by a float to adjust dosage
proportionate to raw water flow rate automatically. 2 nos.
viii) Lining of wetted surface of alum tank and alum dosing tank with
chlorinated rubber paint or bitumen. 1 item.
ix) Lime agitator paddle of MS arms mounted on a horizontal MS shaft
and fitted with hardwood paddle blades and lime lifting cups 1 set.
x) Lime agitator drive comprising electric motor with starter, coupled
through speed reducing gear-box to paddle shaft. Shaft provide with
stuffing box at wall entry point. The details are: 1 set.
DTS : Detailed Tender Specification. Page 233