This is a website that offers comprehensive information including videos, applets, an extensive Glossary as well as tips on pump design. The entire material is also collated and written down in the form of a free-to-download ebook. The notes are not very involved from a mathematical aspect and has turned out to be a pleasant and interesting read.
You may get a warning about malware from this website. However, I've been exploring the website and nothing seems to have happened yet. This is definitely, a great source of information on pumps and the physics behind it's functioning as well as design. The site tries to provide you complete background theory as well to enable you to understand pump design and also provides links to good material in other sites, including those of manufacturers.
Check out > http://www.pumpfundamentals.com
See the section All About Pumps : A collection of web sources related to Pumps, including fundamental concepts, Industry news and very interesting technical magazines and newsletters that offer free digital subscriptions.
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