Uv flow queation

[roggy23]

Please see attached.. I mainly wanna know best way to get 251 gph thru currently set up uv.. replace my 951 sicce uv pump currently installed, adjust currently placed valve, or add a valve before uv and adjust valve that way? Will a 251 gph sicce pump even rise 4.5 feet? Thanks all

 

[vetteguy53081]

I use a ball valve on mine for flow rate control

 

[JNalley]

Please see attached.. I mainly wanna know best way to get 251 gph thru currently set up uv.. replace my 951 sicce uv pump currently installed, adjust currently placed valve, or add a valve before uv and adjust valve that way? Will a 251 gph sicce pump even rise 4.5 feet? Thanks all

the backpressure will prohibit flow through the rest of the line, so yes, a valve after the UV will reduce flow through the UV all the way back to the pump. Though more and more I'm considering DC returns as a better option because there's no valve needed...

 

[roggy23]

the backpressure will prohibit flow through the rest of the line, so yes, a valve after the UV will reduce flow through the UV all the way back to the pump. Though more and more I'm considering DC returns as a better option because there's no valve needed...

So I'm ok the way I have it just gotta close the valve up a bit.

 

[JNalley]

So I'm ok the way I have it just gotta close the valve up a bit.

correct, you'll be fine with how you have it, though, because you're going horizontal on the UV make sure the top of the UV is at least 15 degrees higher than the bottom of the UV so air bubbles can easily escape, getting air trapped in a UV is not good.

 

[Shirak]

I am confused.. Is there just one pump and you are using it as the return pump and sending it all through the UV?

To answer your other question. A pump rated for 251gph will not pump 251gph at 4.5' of head pressure. Half that if you are lucky... You need to look at the pumps flow ratings at different head pressures to find one that will work. Most people just oversize them as it's easy to dial it back but if you buy one that's not strong enough there is nothing you can do except buy a larger one.

 

[JNalley]

I am confused.. Is there just one pump and you are using it as the return pump and sending it all through the UV?

To answer your other question. A pump rated for 251gph will not pump 251gph at 4.5' of head pressure. Half that if you are lucky... You need to look at the pumps flow ratings at different head pressures to find one that will work. Most people just oversize them as it's easy to dial it back but if you buy one that's not strong enough there is nothing you can do except buy a larger one.

whoa, I only looked at the drawing and it read 951GPH, I didn't realize he had 251 typed out >.< yeh... that's not enough flow...

 

[Mywifeisgunnakillme]

add a flow meter or collect water going in the tank and calculate the flow rate. use the bigger pump too.

 

[Mywifeisgunnakillme]

if you only have one pump for the return and want to control flow to the UV with it, but also have more flow to the tank, you can look at my build thread for the 50 gallon.

 

[roggy23]

I am confused.. Is there just one pump and you are using it as the return pump and sending it all through the UV?

To answer your other question. A pump rated for 251gph will not pump 251gph at 4.5' of head pressure. Half that if you are lucky... You need to look at the pumps flow ratings at different head pressures to find one that will work. Most people just oversize them as it's easy to dial it back but if you buy one that's not strong enough there is nothing you can do except buy a larger one.

I have 2 pumps..1 vectra for return the other is a 951 gph sicce pump... the plumbing goes from sicce pump in sump up into main display

 

[roggy23]

whoa, I only looked at the drawing and it read 951GPH, I didn't realize he had 251 typed out >.< yeh... that's not enough flow...

I have a 951 gph pump not 251...was considering getting a small pump but im just gonna lower flow to uv via valve shown

 

[roggy23]

Would I put the flow meter before or after uv? I have an apex el so maybe I can add a flow meter

 

[Mywifeisgunnakillme]

Would I put the flow meter before or after uv? I have an apex el so maybe I can add a flow meter

Should not matter. More important i believe is that it is away for corners in a long straight run.

 

[roggy23]

if you only have one pump for the return and want to control flow to the UV with it, but also have more flow to the tank, you can look at my build thread for the 50 gallon.

How can I see your build?

 

[Shirak]

What is the water volume of your system and what are you looking to do with the uv ? Algae/Dino or fish parasites?

 

[roggy23]

What is the water volume of your system and what are you looking to do with the uv ? Algae/Dino or fish parasites?

180g. 40 watt...tried it at 951 gph but still got algae so now I'm just gonna lower it to prevent parasites hopefully.
I am fighting dinos the right way atm.. these dinos aren't in water column so uv is useless I guess.