J
jd_75g
Guest
I have a CS100 HOB Overflow box (800gph) and a Mag 9.5 for my return. How do I determine which PVC to go with? Will 1" pipe to the job?
J
jd_75g
Guest
Originally Posted by pbnj
http:///forum/post/3006204
1" drain and 3/4" return will work just fine.
Thanks...how do you figure that out? Is there a formula you should use?
http:///forum/post/3006204
1" drain and 3/4" return will work just fine.
Thanks...how do you figure that out? Is there a formula you should use?
natclanwy
Active Member
Google "Headloss Calculator" it will tell you what the flow rate of a given pump is after headloss and head friction have been subtracted then you can compare that to the flowrate of your overflow. Overflows have a standard drain rates 1"= 600gph, 1.25"=900gph, 1.5"=1200gph aproximatly these numbers can change depending on the plumbing used and how much head is on the drain with HOB overflows its always going to be on the low side because there is no head pressure feeding the drain.
FYI be cautious with the CPR overflows they have a high failure rate and be sure you are using the aqualifter pump with it. Without it you are guarenteed to have a flood. Also be sure and clean the tubing for the aqualifter regularly and clean the overflow on a regular basis. I don't know if it is an option but if you can I would exchange it for a U-tube style overflow they are much more reliable and much cheaper than the CPR overflows.
FYI be cautious with the CPR overflows they have a high failure rate and be sure you are using the aqualifter pump with it. Without it you are guarenteed to have a flood. Also be sure and clean the tubing for the aqualifter regularly and clean the overflow on a regular basis. I don't know if it is an option but if you can I would exchange it for a U-tube style overflow they are much more reliable and much cheaper than the CPR overflows.
J
jd_75g
Guest
Originally Posted by natclanwy
http:///forum/post/3006287
Google "Headloss Calculator" it will tell you what the flow rate of a given pump is after headloss and head friction have been subtracted then you can compare that to the flowrate of your overflow. Overflows have a standard drain rates 1"= 600gph, 1.25"=900gph, 1.5"=1200gph aproximatly these numbers can change depending on the plumbing used and how much head is on the drain with HOB overflows its always going to be on the low side because there is no head pressure feeding the drain.
FYI be cautious with the CPR overflows they have a high failure rate and be sure you are using the aqualifter pump with it. Without it you are guarenteed to have a flood. Also be sure and clean the tubing for the aqualifter regularly and clean the overflow on a regular basis. I don't know if it is an option but if you can I would exchange it for a U-tube style overflow they are much more reliable and much cheaper than the CPR overflows.
My overflow has a flow rate of 800gph and the mag 9.5 with 4' head is 800gph, so think I am good there. I just don't get how you determine the size of PVC
http:///forum/post/3006287
Google "Headloss Calculator" it will tell you what the flow rate of a given pump is after headloss and head friction have been subtracted then you can compare that to the flowrate of your overflow. Overflows have a standard drain rates 1"= 600gph, 1.25"=900gph, 1.5"=1200gph aproximatly these numbers can change depending on the plumbing used and how much head is on the drain with HOB overflows its always going to be on the low side because there is no head pressure feeding the drain.
FYI be cautious with the CPR overflows they have a high failure rate and be sure you are using the aqualifter pump with it. Without it you are guarenteed to have a flood. Also be sure and clean the tubing for the aqualifter regularly and clean the overflow on a regular basis. I don't know if it is an option but if you can I would exchange it for a U-tube style overflow they are much more reliable and much cheaper than the CPR overflows.
My overflow has a flow rate of 800gph and the mag 9.5 with 4' head is 800gph, so think I am good there. I just don't get how you determine the size of PVC
natclanwy
Active Member
There is a table somewhere that gives the drain rates for a given size of pipe, I just always remember that 1" is 600gph and every .25" bigger = +300gph. These drain rates are ball park figures for piece of pipe with zero head pressure and a continous straight piece of pipe. If there are any bends or valves in the plumbing this will reduce the drain rate. If you are draining out of the bottom of a 3' tank then you have head pressure and it will increase the drain rate.
On your overflow you will need to use 1.25" pipe for the drain on your overflow in order to achieve 800gph.
On your overflow you will need to use 1.25" pipe for the drain on your overflow in order to achieve 800gph.
pbnj
Member
I think you're over-analyzing the PVC issue. Your return flow rate doesn't have to match your overflow exactly. Just being in the range is sufficient.
A 1" drain and 3/4" return will work just fine.
By the way, as long as you have an aqeduate-sized sump and a float switch for your pump, you can never flood with a CPR overflow box, or any other overflow box for that matter.
A 1" drain and 3/4" return will work just fine.
By the way, as long as you have an aqeduate-sized sump and a float switch for your pump, you can never flood with a CPR overflow box, or any other overflow box for that matter.
pbnj
Member
Originally Posted by salt210
http:///forum/post/3007343
that statement was made to caution the OP about potential problems
I'm with ya...
http:///forum/post/3007343
that statement was made to caution the OP about potential problems
I'm with ya...