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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Codes and standards:<br />
The design, manufacture and performance of the centrifugal pumps specified here<br />
in shall comply with the requirements of the latest edition of the applicable codes<br />
and standards.<br />
Standard Title<br />
IS 6595 Horizontal centrifugal pumps for clear cold and fresh water<br />
IS 9137 Code for acceptance tests for centrifugal, mixed flow and axial<br />
pumps<br />
IS13537/ ISO 5199 Technical specification for centrifugal pumps - Class 2<br />
ISO 5199 Standards of the Hydraulic Institute of USA.<br />
Design requirements:<br />
The pumps shall be capable of developing the required total head at rated capacity<br />
for continuous operation. The contractor shall match his pumps to the system -<br />
Head curve, and the pumps shall operate satisfactorily within the operating range.<br />
The pump shall have a stable head capacity curve, i.e. the total head-capacity curve<br />
shall be continuously rising towards the shut off.<br />
The material of the various components shall conform to relevant section of IS.<br />
Performance requirement for the pumps shall be guided by the data specification<br />
sheets.<br />
The power characteristic shall be non overloading and preferably flat for flows<br />
higher than the best efficiency flow (BEP).<br />
The required pump NPSH at duty point shall be at least 0.5 metres less than the<br />
available NPSH. The pump shall be designed to work with a least two metres<br />
suction lift.<br />
Pumps must be suitable for operating alone or in parallel over the entire operating<br />
range. The pumps shall operate satisfactorily at any point between the maximum<br />
and minimum system resistance, wherever system resistance curve is specified or at<br />
the end of pump performance curve, with respect to the NPSH available at the<br />
lowest permissible suction water level.<br />
The pump rotational speed shall be selected taking into consideration the NPSH<br />
available. The pump RPM. shall be such that the suction specific speed shall be<br />
limited to 8500.<br />
GTS : General Technical Specification. Page 147
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