April 2011
Beginner to intermediate
264 pages
8h 24m
English
Content preview from Practical Centrifugal Pumps
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130 Practical Centrifugal Pumps
Therefore, it is necessary to forward the bid request only to those vendors whose bids
will be seriously considered if their pumps meet all the requirements.
6.4 Bid review/analysis
A clear and comprehensive specification enables a purchaser to compare the bids on an
equal basis. The exceptions made by the vendors need to be weighed and factored against
the desired features and prices offered.
An analytical approach demands a tabulation of bids to ease the comparison of the offers.
This is typically classified into the following.
Hydraulic performance
• Percentage of rated flow to the flow rate at BEP
• Pump numbers – specific speed and suction specific speed
• NPSH-r, NPSH-a margin (at rated and maxim ...
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