[SEL] O.T. O.T. Need Help On Water Flow Problem

[kevin armstrong]

hello Paul,
Pascals law is " pressure is equal and undiminished in hydraulic circuit" 
but when you fit holes to it you get pressure drop due to the water flowing 
out the holes, 1/4"  holes are to big, 1/16th" would be better. work out the 
area of a 1/4" hole multiplied by the number of holes is would be more than 
the 1/2" pipe in.


Kevin & Lorraine Armstrong
Collectors of old things
Perth
WA
Australia
Vintage Tractor & Machinery Association member
V.C.C. of WA. member
k_armstrong at arach.net.au
www.oldengine.org/members/armstrong

----- Original Message ----- 
From: <paulmaples at sbcglobal.net>
To: <sel at lists.stationary-engine.com>
Sent: Wednesday, June 03, 2009 10:41 AM
Subject: [SEL] O.T. O.T. Need Help On Water Flow Problem


> Folks I need to apply equal amounts of water at 16 locations around a 
> rectangular square made if 1/2" pvc pipe. (8 locations down each side and 
> none on ends)
>
> The length of each side of the rectangle is 111" and the ends are 27".
>
> http://s52.photobucket.com/albums/g36/wheelterrapin/?action=view&current=diagram.jpg
>
> One man told me to drill 1/4" holes at each of the 16 locations but I 
> argued with him that the first few 1/4" holes located closest to the input 
> of the water would get more water than the rest and he said it would 
> not.....well they did. The first 4 holes on each side of the PVC closest 
> to the inlet of the water shot out streams of water about 4" long and the 
> last holes, the ones furthest away from the inlet of the water just 
> dribbled water.
>
> I am only drilling holes down the length of the rectangle and none on the 
> ends. The PVC pipe size is 1/2" and as stated above the length of each 
> side is 111" long.
>
> I use a 5/8" water hose (it only has a 1/2" bore size) to bring water to 
> the inlet of the rectangle. The bore size of the 1/2" pvc pipe is .485", 
> almost 1/2".
>
> The water flow rate is 5 gpm per minute coming out of the end of the 5/8 
> hose.
>
> Can someone tell me how to plumb the rectangle in order to achieve an 
> equal flow of water at each of the 16 drilled hole outlets. I would assume 
> I will have to start out with small holes closest to the inlet and 
> gradually get bigger towards the end opposite the inlet of the water. I 
> just want the water to dribble out and not shoot out in streams and I 
> need, as close as I can get it, equal amounts coming out at each of the 16 
> drilled locations.
>
> At each of these 16 locations there is a tomato plant. I am trying to 
> calculate how long to leave the water on in order to be able to supply 1" 
> of water to each plant as the tomato plants require 1" of water weekly and 
> more during the hot months.
>
> I will appreciate any and all help on this.
>
> Thanks,
>
> Paul
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