Backyard Aquaponics
A place to discuss aquaponics

im going home tonight and holding a 50mm pressure and DWV 90 together, i dont think the curve would be too different. :wacko:

DWV = Drain waste vent - i.e. stormwater pipe.

3 years now 24/7 and still hasn't been cleaned yet

Thanks.. so my suspicion was correct that the D WAS DRAIN...

Part of the uncertainty with Pressure is that there are various thicknesses.. ie. Pressure capacities..

I would think that the difference between the DWV and the top "pressure" pipe would be Measurable....

How nice to be enthusiastic and make the same structure of bends and lengths for DWV and Pressure and then measure the difference..
This little black duck could not be bothered..
..
.

I.do wonder.. we will all likely support the pump we have and thus the historically more popular device will win out and the possibly BEST pump will be discounted because there were few votes..

In any case.. how do we rate. "Other"

SORRY.. I can't see how the poll can be justifiable..

It's like Miele DishWasher owners claiming their machine is the outstanding best - naturally because they bought it at massively higher price and would never say they were duped.. (until they have to pay the cost of spare parts)
Ie. The Haier owner won't respond, because they will be embarrassed by their cheap choice..

And... sorry... what is the value in ReVoting, if not than to distort the result. ..
..
.

Nope.

Some people are never happy....

Over time pumps that are good cheap, reliable and efficient will be used by more people so get more votes I'm guessing... What do you mean by the BEST pump? The most efficient? The most reliable? The cheapest? Different people have different goals in what they consider makes something the best..

Its to do with the ratio of the radius of curve to the diameter of the pipe.

In a pressure pipe 90 degree bend its basically an immediate right angle curve with the radius of the curve equal to half the diameter of the pipe. Gives a ratio of R/D=0.5

In DWV the radius of the curve is roughly equal to the diameter pipe so a ratio of R/D=1.

Makes a big difference in how water flows through the bend.

I was trying to think of at least a reasonable analogy for this but after a few beers this is what you get.

You go to an aquatic amusement park and go on the water slide; there are two. One has a number of turns in it in which the radius is reasonably large and has few joins on the sections. Off you go; the ride is fast with a few minor bumps which slow you down (or at least give you a little discomfort).
The second has sharper turns and more joins; the ride is slower because you are being bounced off the roof and the walls. You end up at the bottom with bruises and dislocations.

Its a popularity contest.

The value of re voting is that someone buys a pump and they are wrapped with it so they vote for it. Then it blows up, then they don't get decent customer service or the second one blows up or they get round to measuring the flow and find its not as advertised and then they measure the current and find its more than advertised and then they want to change their vote.

Especially that last bit of the second ride which goes straight down with a right angle bend at the bottom.

Absolute cracker of a post, well done sir!

buuuuut, if the slide has tighter turns, shouldnt they be able to get away with less joins, especially in the bends?

you do like to confuse me.

Just think about this:



How would you like the ride to end? A 90 degree bend at the end or a series of 15 degree bends until you get to the horizontal run out.

"buuuuut, if the slide has tighter turns, shouldnt they be able to get away with less joins, especially in the bends?

you do like to confuse me."

Yav I would be really happy with a pipe bender (as in for a flowed manifold or air induction to a turbo) for PVC (in a manner of speaking). Structurally the gentle curve with no joins is both better for gas flow and stronger.
Once you start to introduce eddys ie joins and cause a rapid and violent flow shift, as in tight bends energy is expended.
Water consists of a number of dipoles (you can make them alter) but basically they like to stick together. Tossing them round expends energy.

I have no reason to try and confuse you; you should just go with the flow.

lol sleepe, damn, thats where i went wrong.


stuart, that depends on the end result that i am after, if i want more height i would go with the sharp 90, if i want my legs to remain unbroken, the longer bend.