Here is a link to a pump selection program based on total head pressure. you must put in the length, size of pipe, number of fittings and offsets, number of valves and click solve and it will give you the head pressure and flow rate at the output. Just follow the directions at the top of the page below the search block and you will find an advanced sizing article, as well as the link to the pump size program.
http://www.reefs.org/library/pumps/
Here is another link for pump sizing, head loss, easy way to tell if you have selected the correct pump.
http://www.reefcentral.com/calc/hlc2.php
http://www.reefs.org/library/pumps/
Here is another link for pump sizing, head loss, easy way to tell if you have selected the correct pump.
http://www.reefcentral.com/calc/hlc2.php
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