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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19.25 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 25kg/cm 2 and seat pressure shall be of 20kg/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 />
19.26 MSDF Enlarge/Radial Tee.<br />
Suitable CIDF Enlarger/Radial Tee having with stand capacity of hydrostatic<br />
pressure of 20kg/cm 2 shall be provided each pump delivery branch as necessary.<br />
19.27 Rubber Expansion joints.<br />
To relieve the pumps from pipe line stresses as well as for ease of dismantling and<br />
fitting of pump assembly during maintenance, R.E. joints shall be provided to each<br />
pump discharge branch, after the pump discharge flange. The RE joints shall be of<br />
suitable size (minimum 200mm. N. B.), single bellow, steel reinforced rubber. The<br />
hydrostatic test pressure of the R.E. joints shall be 25kg/cm 2 . The flanges should<br />
match to those of adjoining valves flange / pump discharge flange. The R. E. joints<br />
shall be complete with long stud holding arrangements of steel etc. as necessary.<br />
19.28 Pressure Relief valve for rising main.<br />
To relieve the rising main from excess pressure, spring loaded pressure relief valve<br />
shall be provided to the rising main outside the pump house with necessary by pass<br />
arrangement so that in case of excess pressure within the rising main beyond the<br />
preset limit developed if any due to any reason what so ever, the pressure is<br />
automatically balanced by release of water through by pass etc.<br />
19.29 Air release valve for common delivery manifold.<br />
The common delivery manifold shall be provided with one number double throat<br />
Air release valve for Automatic entry of Atmospheric air to break the negative<br />
pressure within the manifold as soon as all the pumps are stopped.<br />
DTS : Detailed Tender Specification. Page 206
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