SUBJECT : Rules of thumb for pumps 2-7

If you want to know a pumps capabilities, the rules are simple. Look at the manufacturer's published pump curve. The problem is that you do not always have the curve available. Pump companies test their pump to determine its performance, they have no need for general guide lines or "rules of thumb."

Over the years I've accumulated many of these rules to help me estimate pump performance. Here are a few of them:


These numbers assume that the lubricating oil is not being contaminated by water from one or all of the following sources:

An automobile engine running at 1750 rpm. would cover about 100,000 miles (160,000 kilometers) every 2000 hours (83 days in the life of a constantly running pump ). Auto manufacturers recommend changing their automatic transmission oil every 25,000 miles ( 40,000 kilometers)




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