Specifications for Package Water Treatment Plant
Ref: Schedule of Rates, MJP, Pune Region, 2012-2013
Designing (aesthetically), providing,fabricating Package Water Treatment Plant at the shop, transporting to site,
installing, testing and commissioning at the site, giving necessary one month's free test and trail run with guarantee for
one year, etc. complete Prefabricated Package Water Treatment Plant comprising following :
1) Rapid mixing channel in M.S. sheets and M.S. baffle.
2) Flocculator not less than 10 minutes detention, in M.S. prefabricated box,flocculation being achieved either by glass pebbles of graded size or PVC tetrapod or equivalent arrangement to ensure good floc formation.
3) Plate or tube settlers of not less than 30 minutes detention in M.S. prefabricated box, the plates / tubes mounted in the
settler basin with inclination of not less than 60 degree to horizontal.
4) Rapid sand gravity filter in M.S. prefabricated box with filter sand not less than 500 mm thick, supported on false floor below with polypropylene nozzles spaced at not more than 500 mm centres in either direction.
5) Backwashing, inlet facilities only shall be provided. Department shall provide either ESR giving 8 to 10 M head at
filter nozzles or backwash pump, having flow rate of 0.6 Cum per minute per square metre of filter bed. (Limit upto
5.0 M. from W.T.P. face)
6) All civil works for foundation, consisting of raised RCC platform above G.L. or walls in B.B. masonry or UCR masonry
shall be provided as per needs at site.
7) Bypass in the form of pipes or M.S.channels included in the design,effecting bypass of such new tank and
filter individually or both. (Limit upto 5.0 M. from W.T.P. face)
8) The entire M.S. fabricated tank provided with FRP lining (5 mm thick) to inside face in contact with water epoxy painting- two coats with one coat of primer on outside. The thickness of plates employed shall not be less than 6 mm
9) Alum dosing and mixing arrangements to be provided in twin tanks, each of 8 hours capacity, capable of importing
does of 20 ppm with 5% solution. The alum tanks provided with a dose in steps of 5 ppm and entire unit mounted
on the top of flocculator / settler box, in the form of prefabricated structure, with access platform and ladder. Alum boxes
with FRP lining (5 mm thick) inside and epoxy paint two coats with one coat of primer on outside.
10) Both flocculator and settling basins provided with hopper bottom with slope not less than 45 degrees to the horizontal drain pipes and valves provided to both flocculator and settling basin.
11) Flow ratings to conform following parameters :
a) Velocities in channels not to exceed 0.6 M./Second.
b) Velocities in filter outlet pipes and valves not to exceed 1 M./Second.
c) Velocities in interconnecting pipe and controls not to exceed 1M./Second.
d) Backwash with air : Not required.
e) Backwash with water : Not less than 0.6 M./ Sqm. of filter bed area in filter box.
12) Free board for all units not less than 300 mm
