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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Butterfly valve for individual pump discharge branch and common header.<br />
The Butterfly valves shall be CSDF ling wafer type, P.N., conforming to<br />
IS:13095. The seat pressure shall be 25kg/cm 2 and the body pressure shall be<br />
30kg/cm 2 . The valve shall operate smoothly and steadily in both directions, free<br />
from flow induced vibrations. It shall provide tight shut off closure and shall be<br />
suitable for frequent operations as well as for throttled duty condition. The valve<br />
disc should rotate 90 from full open to full close position. The valve disc shall be<br />
solid stream lined slab design and to have minimum head loss. The seal ring shall<br />
be replaceable type and to be bolted on the body. The rubber seal on the disc must<br />
be of easy replaceable type with the facility of replacement at site. The valve of<br />
both individual pump branch and common header shall be CIDF and of suitable dia.<br />
subject to minimum 200mm. and 300mm. respectively for individual pump branch<br />
and common header. Operational arrangement of the Butterfly valves shall be with<br />
motorized actuator with inbuilt gear box and providing with extended spindle with<br />
suitable yoke so as to operate the same by the operator standing at ground / floor<br />
level.<br />
Non-return Valves.<br />
The N. R. valves shall be of suitable dia. (minimum 200mm.), CSDF, single door,<br />
suing check type which shall be provided with each individual pump discharge line.<br />
The body pressure shall be of 30kg/cm 2 and seat pressure shall be of 25kg/cm 2 . The<br />
Non-return valves shall have ample thickness and the disc shall be of non slam type.<br />
The disc of the valves properly weigh balanced to prevent pump against the valve<br />
body while in operation.<br />
The valves should pass through a hydrostatic test for minimum 30 minutes duration.<br />
MSDF Enlarge/Radial Tee : Has been detailed elsewhere in this document.<br />
Rubber Expansion joints : Has been detailed elsewhere in this document.<br />
Pressure Relief valve for rising main : Has been detailed elsewhere in this<br />
document.<br />
Air release valve for common delivery manifold : Has been detailed elsewhere in<br />
this document.<br />
Erection, testing and commissioning, operation and maintenance : Has been<br />
detailed elsewhere in this document.<br />
Small Power, lighting distribution and illumination system : Has been detailed<br />
elsewhere in this document.<br />
DTS : Detailed Tender Specification. Page 277
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