Here is an article that I found. If anyone has built a spray bar and has had problems with too much flow at the first point of holes drilled and less pressure at the end of the bar ere is a great solution.>
by scottn-at-fluffrag.Eng.Sun.COM (Scott Nye)
Date: 22 Jan 92
Newsgroup: alt.aquaria
In article <1992Jan20.232943.16118-at-kronos.com> richb-at-kronos.com (Rich Braun) writes:
>enenkel-at-cs.toronto.edu (Robert Frederick Enenkel) writes:
>>Just a word of warning. Enlarging spray bar holes doesn't necessarily do
>>what one might naively expect it to. I drilled out the holes on the spray
>>bar of one of my Eheim 2034's. This filter comes with a 1" diameter spray
>>bar with about 1/8" holes. Unmodified, it shot the water straight out of
>>the holes. I drilled them out to 1/4". Ooops.
>
>The area of a hole increases with the square of the diameter. So instead
>of doubling the amount of area for water flow, you quadrupled it. Given
>my 1/16" holes, therefore, it would probably be foolhardy for me to
>immediately drill them all out to 1/8". Drilling out every other hole to,
>for example, 3/32" would be safer. Then if that wasn't enough, drill out
>the rest of the holes to 3/32"; then if more is needed, drill every other
>one out to 1/8". In things political, go liberal; in things physical,
>go conservative. ;-)
If the spray bar is long relative to its diameter, you make the holes
closest to the water supply largest, then proceed to the points on the
bar farthest from the supply. The holes at the points farthest from
the water supply should be the smallest.
Just think of a long heating duct in a house. The duct is usually tapered
so that the end is smaller. This maintains even flow out of all the ducts.
Scott Nye
scott.nye-at-sun.com
by scottn-at-fluffrag.Eng.Sun.COM (Scott Nye)
Date: 22 Jan 92
Newsgroup: alt.aquaria
In article <1992Jan20.232943.16118-at-kronos.com> richb-at-kronos.com (Rich Braun) writes:
>enenkel-at-cs.toronto.edu (Robert Frederick Enenkel) writes:
>>Just a word of warning. Enlarging spray bar holes doesn't necessarily do
>>what one might naively expect it to. I drilled out the holes on the spray
>>bar of one of my Eheim 2034's. This filter comes with a 1" diameter spray
>>bar with about 1/8" holes. Unmodified, it shot the water straight out of
>>the holes. I drilled them out to 1/4". Ooops.
>
>The area of a hole increases with the square of the diameter. So instead
>of doubling the amount of area for water flow, you quadrupled it. Given
>my 1/16" holes, therefore, it would probably be foolhardy for me to
>immediately drill them all out to 1/8". Drilling out every other hole to,
>for example, 3/32" would be safer. Then if that wasn't enough, drill out
>the rest of the holes to 3/32"; then if more is needed, drill every other
>one out to 1/8". In things political, go liberal; in things physical,
>go conservative. ;-)
If the spray bar is long relative to its diameter, you make the holes
closest to the water supply largest, then proceed to the points on the
bar farthest from the supply. The holes at the points farthest from
the water supply should be the smallest.
Just think of a long heating duct in a house. The duct is usually tapered
so that the end is smaller. This maintains even flow out of all the ducts.
Scott Nye
scott.nye-at-sun.com
