Have you ever measured real water pump output flow rate?

Gary,

Manufacturers ratings are based on an unrestricted flow with little to
no resistance from the piping.
In other words, they use very large pipes for the size of the pump
outlet. Normally more than double the size of the pump outlet!

I would have guessed wrong. I thought that the pump would be tested with the
same size hose that the connection called for. This is misleading..!! Makes
it tough to choose a pump properly. I will stow this tid-bit of information
for my next installation.

aquacare





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"Aquatic-Care" verbositized:

Gary,

Manufacturers ratings are based on an unrestricted flow with little to
no resistance from the piping.
In other words, they use very large pipes for the size of the pump
outlet. Normally more than double the size of the pump outlet!

I would have guessed wrong. I thought that the pump would be tested with the
same size hose that the connection called for. This is misleading..!! Makes
it tough to choose a pump properly. I will stow this tid-bit of information
for my next installation.

I would venture to guess that a Maxi-Jet's flow rate at the given
height for their test is done using the Maxi-Jet output feeding
directly into a 1-1/2 inch to 2 inch standpipe.

I used all 1 inch tubing for most of my reef plumbing and it made a
BIG difference, especially on the feed from the sump up to the tank.
A 3/4 inch hose, after about 3 months of use, even with monthly
cleaning, really seems to slow down quite a lot.

If you check in the dishwasher section of your hardware store, you
will find a black neoprene reducer with two hose clamps to bring you
from the output size of the Maxi-Jet up to 1 inch PVC. I have not
found one yet that goes from the output size up to 1-1/4 or I would
have gone that route instead.

Another alternative is a rubber grommet placed into a PVC pipe cap on
the lower end of your vertical lift tube. This would be slid over the
Maxi-Jet's output fitting.

You've probably heard me say this before, but keep the current in your
tank with the natural flow of the water. In north America this is
counterclockwise, down under (Australia) it is clockwise.

TTUL
Gary

You've probably heard me say this before, but keep the current in your
tank with the natural flow of the water. In north America this is
counterclockwise, down under (Australia) it is clockwise.

TTUL
Gary

The natural flow of water? A fish tank is too small to exhibit Coriolan
tendencies. If you are refering to something else, please explain...

"Ed Greco" wrote in message ...
The natural flow of water? A fish tank is too small to exhibit Coriolan
tendencies. If you are refering to something else, please explain...

http://www.physics.ohio-state.edu/~d...du/newcor.html :-)

The natural flow of water? A fish tank is too small to exhibit Coriolan
tendencies. If you are refering to something else, please explain...

http://www.physics.ohio-state.edu/~d...du/newcor.html :-)

I think what he is saying is that even though those forces exist, they do not exist in a
large enough scale to really effect a fish tank.

and they may or may not, I have not spent the time trying to figure it out, I do have a
125 gal grow out pond that spins "backwards" and it does so with ease so my vote as if it
mattered, is for the volume of water we have, this will not effect pump performance. if
you read the section 5.2 in your link it might explain this a little.

--
Richard Reynolds

Hi Ed

Actually its Coriolis Force, named after its discoverer
Gustave-Gaspard Coriolis in 1835.

It has been proven to affect all bodies of liquid regardless of size!

Drain your sink of less than 1/2 gallon or flush your toilet of 1.6
gallons, these are much smaller than the majority of aquaria.

Ascher H. Shaprio proved the effect again in 1962 at MIT and Lloyd
Terfethen did the same at the U of Sydney in 1965.

In an aquarium, the effect may be miniscule, but it is still there
just the same. So why not keep your aquarium flowing with the natural
order of things, rather than trying to go against mother nature.

As an aside, a major contractor built a rather large fountain and did
not take into account Coriolis Force or the Curvature of the Earth.

When the fountain was filled, water did not pour over the length as
intended, but flowed only out the center. With the greater part of
the water at the apex of the counterclockwise rotation. Of course,
this was a very large fountain too.
However, the same effects would be found in even the smallest
fountain, but to such a reduced degree that it would probably not be
noticable without the most accurate test equipment.

The moon also plays a very miniscule part on our aquaria. On large
public aquaria a difference of as much as 1/2 inch can be noted
between neap tide and full tide. On a large body of water, the water
level in a large aquarium can be determined with fair accuracy using
either the Rule of Twelves or the Rule of Sevens.

TTUL
Gary