dart pump question

christyf5 · #1 02-08-2009, 10:48 PM

the 6' is vertical but by the time it comes out of the pump and then goes up and tees off to each sea swirl theres a whole lotta elbows.

Quote:

Originally Posted by wolf_bluejay

First, it is 12' of "head" that the pump stops working at, NOT 12' of pipe, and the frictional losses depend heavily on the pipe size. 1.5" pipe is more than enough for a dart.
Second, are you counting each output elbow of the sea swirl as a inline elbow. You should be counting each elbow in the "path" to the tank.

IE: if your return splits into 8 lines and each has an elbow, you really only have 1 elbow between the pump and the tank.

BTW: I had a dart, and now a snapper and I do love those pumps.

wow this was like another language to me. the return was basically splitting into two lines each having a crapload of elbows. Heres an artistic rendition of what I'm talking about. Yes I know my talent is pretty impressive

I will be using 1.5" pipe, I'm thinking spa flex will likely be the way to go anyways as hillegom mentioned, there will be less friction. As for the elbows that are actually part of the sea swirl, I had totally forgotten about those.

Thanks for the help guys, keep it going if you have any other suggestions! I've been living in submersible mag pump land for the past 5 years, its as far as I can think

Lance · #2 02-09-2009, 12:16 AM

Quote:

Originally Posted by christyf5

the 6' is vertical but by the time it comes out of the pump and then goes up and tees off to each sea swirl theres a whole lotta elbows.

wow this was like another language to me. the return was basically splitting into two lines each having a crapload of elbows. Heres an artistic rendition of what I'm talking about. Yes I know my talent is pretty impressive

I will be using 1.5" pipe, I'm thinking spa flex will likely be the way to go anyways as hillegom mentioned, there will be less friction. As for the elbows that are actually part of the sea swirl, I had totally forgotten about those.

Thanks for the help guys, keep it going if you have any other suggestions! I've been living in submersible mag pump land for the past 5 years, its as far as I can think

Christy, I would suggest a gate valve between the sump and the pump and another on the return line. Very handy for setting your flow just how you want it.

Lance · #3 02-09-2009, 12:19 AM

Quote:

Originally Posted by Lance

Christy, I would suggest a gate valve between the sump and the pump and another on the return line. Very handy for setting your flow just how you want it.

EDIT: That should read a gate valve on the drain line and one on the return line. You don't need one between the sump and the pump.

hillegom · #4 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 · #5 02-09-2009, 02:14 AM

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

christyf5 · #6 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 · #7 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

Lance · #8 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 · #9 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 · #10 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.