On Sat, 26 Jul 2003 13:40:24 GMT, graham wrote:

I am having to replace my nursery pro pump, I need something that will
deliver around 600gph to the top of a 6 ft water fall with 1in tubing. I am
looking at the OASE Nautilus 30 as a replacement, am I on the right track or
not



Below is a rough guide on rating a pump.

You can calculate the effect of the pipe on the flow using the chart at
http://www.plumbingsupply.com/flowchart.html. At 600gph down 100ft of
pipe you would loose 6.02psi. For 30ft this is about 2psi, multiply
this by 2.3 to get the height, this gives us 4.6ft, add this to the
height of the waterfall and we get 10.6 feet.

Note the tables are for smooth plastic pipe and if you are using pipe
that isn't smooth inside it will slow the flow dramatically.

So assuming you have 30 foot of 1 inch pipe you need a pump that can
deliver 600 gallons per hour at a head of 10.6ft.

I don't know the Nautilus 30 (I'm in the UK) but the Nautilus 3000
would only be pumping 56gph at this height, 385gph at 6 foot so if
these are the same pump then no, it won't manage. Look at something
like the Otter Maximus 5000, Tetra GPX7000, Blagdon P8000 or Laguna
Power Jet 7000. The Tetra one is 235 watts so not very efficient
compared to the Otter at 95 watts. The pumps are just ones I have got
on my shortlist for the waterfall here, no doubt there are others. The
NMautilus 6000 would do as would the Aquarius 5000E.

Hope this is useful, it's only a guide though and in the end it's your
choice.

--
Regards - Rodney Pont
The from address exists but is mostly dumped,
please send any emails to the address below
e-mail ngps07 (at) infohit (dot) fsnet (dot) co (dot) uk