Will an equal length -12AN flow more/less/similar to 2 -6AN lines?

I find one site that states flow is directly proportional to the ID of the lines. Suggesting that 2 -6AN would flow similar to 1-12AN.

Yet I find another that says Area = Pi * Radius^2 which would indicate that the -12 has a greater area and flows more than than 2 -6's?

 

2x diameter = 4x area, exactly.

 

You are correct. The -12 hose has twice the area of 2 -6 hoses.

 

Or, to explain it in terms of pizza. Something everybody can understand

 

Do the math- double the diameter, quadruple the area. 2' diameter pizza (1' radius) vs. 4' diameter pizza (2' radius). Area = pi x square of radius.
2' pizza - 3.1416 x 1 x 1 = 3.1416
4' pizza - 3.1416 x 2 x 2 = 12.5664 (4 x the 2' pizza)

 

sounds delicious!

 

Don't go by hose sizes....measure the ID of the actual hose fittings, which are always smaller than the hose sizes, and all hose makers are not the same, nor are their fittings.

Although I did see someone post ages ago that just because a pair of hoses may calculate as the same area as a larger single...does not mean they flow the same. Can't recall his reasons though...might have been due to surface friction etc within the pipe ?

Interesting calculator here...Certainly putting numbers into this, a pair of small hoses flows nowhere near a single larger hose at the same pressure usng -6 and -12 as comparisons.

https://www.copely.com/tools/flow-rate-calculator/

 

This is more what I was getting at. I meant in terms of fluid flow rate through the lines, which is superior and by how much.

Looking at that fluid flow calc. It seems the larger line is leaps and bounds better?

-6 hose at 12 ft and 3 bar = 5.9 lpm 354lph (x2 708lph)
-10 hose at 12 ft adn 3 bar = 32.76 lpm 1965lph
-12 hose at 12ft and 4 bar = 57 lpm 3420lph

using 3/8 for -6 or 9.53mm.
using 5/8 for -10 or 15.88mm
using 3/4 for -12 or 19.05mm.

Feel like I did something wrong.

Reason I ask is guys seem to be getting more out of these AEM380 pumps by running separate -8 lines from each pump to each rail. Than guys merging -8 lines into a single -10 or -12 line. I'd think it would be the other way around.

This guys at a steady 13.5v and trapping 182 in a 3000lb setup. Yet others run out MUCH sooner with dual AEM's and "Y" in the system with a single larger line.

 

The numbers from the calculator do seem far too dramatic. But presumably there is some science/physics behind them.

Unless you were making a **** ton of power on methanol or something though...-12 feed line does seem a tad excessive.

Although I would do a -12 from tank to pump as it's just a gravity feed, via a suitably large filter for each pump.

 

I also remember reading somewhere that hard line flows more than rubber in same size. Something about friction. So I would guess a lined rubber hose would flow more than pure rubber hose. So how much difference? Anyone else care to enlighten us?
Aleck