dart pump question

hillegom · #1 02-09-2009, 02:06 AM

Your artist's impression is good.
Would you be able to go all the way vertical and then tee, and then go straight into each sea swirl?

sphelps · #2 02-09-2009, 02:14 AM

Where did you get that 1 elbow equals one foot of head pressure?

christyf5 · #3 02-09-2009, 02:40 AM

Quote:

Originally Posted by sphelps

Where did you get that 1 elbow equals one foot of head pressure?

You know, I have no idea where I got it originally but I have seen it perpetuated throughout various forums. Is this not the case??

Aquattro · #4 02-09-2009, 02:47 AM

Quote:

Originally Posted by christyf5

You know, I have no idea where I got it originally but I have seen it perpetuated throughout various forums. Is this not the case??

got it from me. 1 90 elbow puts an extra foot's worth of head into a circuit. Or close enough to calculate for our needs.

Of course now that I try to find where I got that from, I can't, and find other sites that tell me 4ft for a 90 at 1" ID...sigh

sphelps · #5 02-09-2009, 03:04 AM

Quote:

Originally Posted by Aquattro

got it from me. 1 90 elbow puts an extra foot's worth of head into a circuit. Or close enough to calculate for our needs.

Of course now that I try to find where I got that from, I can't, and find other sites that tell me 4ft for a 90 at 1" ID...sigh

Yeah that's not even close to being accurate. First it depends on water level height difference, flow rate, pipe diameter and pipe length but if you really wanted to estimate it would be closer to 3 elbows to create one foot of pressure provided the correct pipe size is used. The bigger the pipe diameter the less impact elbows have on head pressure.

Lance · #6 02-09-2009, 02:17 AM

Quote:

Originally Posted by hillegom

Your artist's impression is good.
Would you be able to go all the way vertical and then tee, and then go straight into each sea swirl?

Christy, if you were to go vertical and then tee of as Hillegom says, you would be getting at least 1700 gph flow out of the dart, that is taking into account one gate valve, one union coupling, 6" vertical, 8' horizontal, 6 elbows. This from the RC head loss calculator.

christyf5 · #7 02-09-2009, 02:41 AM

Quote:

Originally Posted by Lance

Christy, if you were to go vertical and then tee of as Hillegom says, you would be getting at least 1700 gph flow out of the dart, that is taking into account one gate valve, one union coupling, 6" vertical, 8' horizontal, 6 elbows. This from the RC head loss calculator.

Oh cool. I still don't get the reason for the gate valve?? Dumb it down for me

Lance · #8 02-09-2009, 03:13 AM

Quote:

Originally Posted by christyf5

Oh cool. I still don't get the reason for the gate valve?? Dumb it down for me

The gate valve enables you to match the water being pumped back to the tank with the water draining into the sump. And if you have a gate valve on the drain line as well, it makes it easy to turn off the drain water for whatever reason: repairs, feeding, etc.

christyf5 · #9 02-09-2009, 03:14 AM

Quote:

Originally Posted by Lance

The gate valve enables you to match the water being pumped back to the tank with the water draining into the sump. And if you have a gate valve on the drain line as well, it makes it easy to turn off the drain water for whatever reason: repairs, feeding, etc.

Got it! Thanks

Lance · #10 02-09-2009, 03:20 AM

Also by using the gate valve you can set your return flow to whatever you want.If you find the flow is too much from the pump just close the valve until you get it where you want it. Sequence pumps actually run quieter and last longer when under less load.