Goal: Build a wrap around spray bar for the entire top of my 180 gal tank. There will be 1 foot gap in the back for an over flow box. If my math is correct that is 180 inches of spray bar. Since I will be splitting up the return, it will be 90 inches per spray bar.
Background info: My pump is a Mag Drive 18 which is rate for 1800 gph. After head loss I would say I have about 1200 gph left. From the pump, there will be a T to split the flow into two returns.
According to Hoppy formula for spray holes below is what I came up with. Is this correct?
Forumla: spray bar holes diameter is equal to or less than 0.8 times the pipe inside diameter divided by the square root of the number of spray bar holes.
Spray holes diameter///// Pipe inside diameter///// Number of spray holes///// Holes spacing at 90in - # Holes Per Inch
1/16" 0.06/////////////// 3/4" 0.75//////////////////// 92////////////////////////////// 1.02
3/32" 0.09/////////////// 3/4" 0.75//////////////////// 41////////////////////////////// 0.46
1/8" 0.13/////////////// 3/4" 0.75//////////////////// 23////////////////////////////// 0.26
1/16" 0.06/////////////// 1" 1.00//////////////////// 164////////////////////////////// 0.81
3/32" 0.09/////////////// 1" 1.00//////////////////// 73////////////////////////////// 0.46
1/8" 0.13/////////////// 1" 1.00//////////////////// 41////////////////////////////// 0.46
I'm leaning toward using 3/32" holes with 1" pipe. I will probably won't use the full 73 but more like 60 holes. My question is will this work with my flow being split at the T? Or do I need to reduce it more?
Last, what angle do I aim the spray: straight down, 45 degree, or horizon to the surface? I was thinking alternating between the 45 degree and 22.5 degree to ensure no dead space in the tank.
Background info: My pump is a Mag Drive 18 which is rate for 1800 gph. After head loss I would say I have about 1200 gph left. From the pump, there will be a T to split the flow into two returns.
According to Hoppy formula for spray holes below is what I came up with. Is this correct?
Forumla: spray bar holes diameter is equal to or less than 0.8 times the pipe inside diameter divided by the square root of the number of spray bar holes.
Spray holes diameter///// Pipe inside diameter///// Number of spray holes///// Holes spacing at 90in - # Holes Per Inch
1/16" 0.06/////////////// 3/4" 0.75//////////////////// 92////////////////////////////// 1.02
3/32" 0.09/////////////// 3/4" 0.75//////////////////// 41////////////////////////////// 0.46
1/8" 0.13/////////////// 3/4" 0.75//////////////////// 23////////////////////////////// 0.26
1/16" 0.06/////////////// 1" 1.00//////////////////// 164////////////////////////////// 0.81
3/32" 0.09/////////////// 1" 1.00//////////////////// 73////////////////////////////// 0.46
1/8" 0.13/////////////// 1" 1.00//////////////////// 41////////////////////////////// 0.46
I'm leaning toward using 3/32" holes with 1" pipe. I will probably won't use the full 73 but more like 60 holes. My question is will this work with my flow being split at the T? Or do I need to reduce it more?
Last, what angle do I aim the spray: straight down, 45 degree, or horizon to the surface? I was thinking alternating between the 45 degree and 22.5 degree to ensure no dead space in the tank.