how to figure pvc size for pump output

[siropa]

I've ordered a dart to use for circulation. It has a 2" input and 1.5" output. Is there some guide on how to calculate the output size of the the pipe? Say if i'm going to have 4 jets off of the pump, i'd assume using 1.5" all the way to the tank would result in too little flow. Should the 1.5" pipe be reduced down to 3/4" or 1" closer to going back into the tank?

 

[KDodds]

You could use either, with 4 points, depending on teh veolcity you want. What's the estimated GPH?

 

[siropa]

I'd guess with head loss around 3000 gph, but that wouldn't include losses do to pipe friction.

 

[KDodds]

So, roughly 750gph per output (depending on individual run resistance), I think you'll probably want to go 3/4", 1" might be a little too dispersed (lower velocity) giving you less "push" the further away from the return point you go.

 

[siropa]

So would you do a 1.5" source line close to all 4 outputs then do the reducer to the tank? or should the 1.5" line be reduced down as well as it gets farther from the pump?

 

[KDodds]

I'd tee it close to the output to 1", then tee the 1" to 3/4", but that's just me.