PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
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Chapter 22<br />
Technical specification for laying of Gravity Main and Feeder Main<br />
22.1 Introduction.<br />
The clear water gravity main and feeder main shall consists DI pipes of size ranging<br />
from 1000mm to 100mm which shall convey water from the water treatment plant<br />
to different zonal reservoirs for a total length of 58063Rm..<br />
22.2 Scope of work.<br />
Scope of work includes survey, layout, design, engineering and laying of clear<br />
water gravity main & feeder main DI pipelines of sizes 1000mm to 100mm for<br />
a total length 58063Rm from water treatment plant to different zonal reservoirs. The<br />
sizes and length of DI pipes covers under the contract are :<br />
1000mm - 2976 Rm<br />
900mm - 7724 Rm<br />
750mm - 2800 Rm<br />
300mm - 9530 Rm<br />
250mm - 12170 Rm<br />
200mm - 9047 Rm<br />
150mm - 13270 Rm<br />
100mm - 546 Rm<br />
In laying of the gravity main and feeder main, the requirement of DI pipes in<br />
random length of 4 to 7m will be supplied by the department from its Godown at<br />
Mawphlang including all specials and fittings like bends, flanges, expansion joints<br />
and valves viz. Sluice Valves for the main, sectionalizing and scouring of the line<br />
and also Air Valves, for fitting and fixing by the Contractor. Providing pipe<br />
supports and anchor block wherever is necessary is within the scope of the tender.<br />
Detailed design and drawings clearly showing the plan and L-Section of the gravity<br />
main indicating the location of valves, air valves and anchor block etc. including<br />
structural drawings of anchor block, valve chamber are required to be submitted.<br />
The work can be started only after the approval of the design & drawing by the<br />
engineer-in-charge.<br />
Taking delivery and transportation of pipes, valves, which are issued as per<br />
free issue of materials from the PHED Store at Mawphlang transporting them<br />
to work site and custody of the same till completion of erection and<br />
commissioning. The Contractor shall be responsible for proper accounting of these<br />
material and return the surplus material if any to PHED stores as per direction of<br />
Engineer-in-charge.<br />
DTS : Detailed Tender Specification. Page 257
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