pump plumbing question?

[ghostrida3]

ime tring to plumb my return pump back to the aquarium. its a mag 9.5 the pump outlet is.75". the manufacture recommends doubling the pvc wich would mean i would nd 1.5" pvc right? am i reading this wrong? obviously the 1.5 doesnt fit and theres no adabter to make it so. how do i do this or am i reading this wrong.

 

[silverwolf72]

I would just stick with the 3/4". I doubt that doubling the output size is going to gain you that much.

 

[AZDesertRat]

Go with at least 1". The friction loss is much less so you will increase the pumping volume due to less head pressure against the pump.

 

[chase33]

I don't know if they have fittings that will bring a 3/4" up to a 1 1/2", but they do have 3/4" to 1 1/4", 3/4" to 1", 1" to 1 1/2" and 1 1/4" to 1 1/2". These are called reducers or bushings and you can get them at HD. You could connect the 3/4" PVC to a 3/4" to 1" bushing. Then you would connect the 1" end of the bushing to a 1" pvc. At this point you could go with the 1" pvc or connect it to a 1" to 1 1/2" bushing. After you've connected the 1" side the other end is 1 1/2" and ready to connect to a1 1/2" pvc. HTH

 

[ghostrida3]

i found an adapter today at the hardwarestore that increased it to 1.5 and screwed right on to the mag 9.5 outlet. ive already got it plumbed, per the calculator i should b able to get about 738 gph into the tank w/ the 1.5" pipe. ille try it out tommorow and let u know how it goes. i was gonna build my closed loop w/ 2" but i think the 1.5 is as big as ime gonna take it. the pvc looks pretty ugly in the tank right now, i guess it will blend in once it gets the purple stuff growin on it.

 

[GuySmilie]

Yeah....that purple stuff..... :lol2:

 

[silverwolf72]

Maybe I'm confused but wouldn't the extra weight of the volume of water counter act the fact that there is less friction? 1.5" @ 3' height has a volume of 65.325 compared to a volume of water of 3/4" @ 3' is 15.904?

 

[gabe3d]

<a href=showthread.php?s=&postid=9662172#post9662172 target=_blank>Originally posted</a> by silverwolf72
Maybe I'm confused but wouldn't the extra weight of the volume of water counter act the fact that there is less friction? 1.5" @ 3' height has a volume of 65.325 compared to a volume of water of 3/4" @ 3' is 15.904?

No, most of the head pressure is made by the water directly above the outlet (gravity is only vertical). There is a slight impact on the water directly surrounding the column of water above the outlet but it can be ignored for our simplistic calculations.