Tunze 1073.04 Piping and head loss

[MisterP]

My question is this, the 1073.04 has 3/4" inlet and outlet correct?

So must I use a 3/4" pipe to return the water?

I ask because I am using a 1" pipe for return and was unsure if this was acceptable. If this is acceptable would I lose more or less head based on the change in diameter of the pipe?

Again I planned to use 2 of these pumps with (2) 1" returns planning to get about 900gph for a 112 gal tank with 40 gal sump (20 of the sump is a refugium with its own very small pump to take water from the main sump to the fuge).

 

[rvitko]

I think it would work and should deliver the flow assuming a total head of less than 5ft keeping in mind a 90 degree elbow adds 1ft. I am not sure how the 1" will affect it, my guess is it would be a wash, while their is less resistance, their is also less "cling" so the water can slip back just as easily if you picture the water sort of climbing the pipe. Basically it can more easily go up the pipe but it can also more easily fall back down.

 

[MisterP]

Ok, so to be specific I will have right at 5 ft of vertical head loss with at most (2) 90 degree bends. Should I use a 3/4" or 1" line here? Will this pump deliver at least 400 gph based on these requirements?

 

[rvitko]

5ft + 2 90s or 5 ft including 2 90s? 5 ft plus 2 90s is 7ft of head and the pump will deliver only about 150 gph, if it is 5ft total including the 90s (3ft of pipe plus 2 90s) you should be fine. If possible I would stick to 3/4", that is what the pump is rated for, I cannot be sure what affect 1" would have but assume it would be negligible. Also, if you are using rigid pipe the whole length, including attachment to the pump, be aware of two possible issues. For one, you will have more noise, second, PVC fittings are tapered and if over tightened into the pump, you will crack the pump. The best solution is to use the included barbs and a short length of hose to connect to the rigid pipe.

 

[MisterP]

Thanks. Looks like I may need a different pump.