Why Different Hz Frequency In Headloss Charts?

[drummereef]

Can someone help me with this.... I've been looking into a couple Pan World Pumps as a return for my 180g build. On the headloss/flow charts there are different curves for 50hz and 60hz. It is a fairly significant loss of head with the 50hz curve. Which one should I be looking at, 50 or 60?

Thanks!

 

[Heinz]

its a matter of speed, 60 is a little faster, therfor moves more water,

in europe is 50 in the US is 60 so it depence where you from

 

[sjm817]

60Hz is 20% faster than 50Hz. If the "wet" part of the pump is the same, it will pump more with the faster motor speed.

 

[drummereef]

Thanks guys! I figured as much since US standard is nominal 120v at 60hz. Japan's standard is 100v / 50hz where Pan World comes from - thus the second curve. The standard for most of Europe is 220v / 50hz from what I understand which is confusing about the difference in voltage there. Especially when you are looking at head loss charts. lol.

Good thing I have an EE in the family.

If anyone wanted to know or care, here's a good list of power standards around the world.

http://www.kropla.com/electric2.htm