waterflow question

[Montana]

when you calculate the water flow in the tank are you taking the volume from the tank and sump or just the tank.

[StirCrazy]

Originally Posted by Montana

when you calculate the water flow in the tank .

read what you just said . the water flow in the tank, so yes you just use the tank.

Steve

[Montana]

sorry maybe i did not ask the question right, If i have a 150 gal tank 100 gal sump and i want to cycle the water 40 times the volume an hour, should it be 40 times the 150 or 250 combined, Just wondering on how big of a pump to get.

[Ruth]

It's usually calculated on the tank volume so in your case base it on the 150g.

[StirCrazy]

Originally Posted by Montana

sorry maybe i did not ask the question right, If i have a 150 gal tank 100 gal sump and i want to cycle the water 40 times the volume an hour, should it be 40 times the 150 or 250 combined, Just wondering on how big of a pump to get.

you would be looking at a pump or pumps that will give you between 7000 and 8000 gph which would give you your 6000 gph after head loss (based on average setups..)

Steve

[Ruth]

IMO that is a lot of flow going through your sump. A lot of people will use a closed loop or in tank powerheads such as Tunze or Seio or Maxijets to give more in tank flow. With that much flow it is also hard to control microbubbles coming back to your display.
For example on my 190g tank I have a closed loop being run by a sequence hammerhead pump (5800gph), 2 Tunze stream 6200 (5300gph X 2) and my return is a quiet one 5000 (1400gph). It gives me roughly 95 times turnover without accounting for any head loss in the pumps which won't be that much as everything is under my tank.

[StirCrazy]

Actualy Ruth it isn't that bad at all, I have 4000gph going through a 33 gal sump, which gives a 121 times turn over just for the sump. if you look at his it would only be a 60X turn over in the sump with 6000gph. If you design it right there won't be bubbles or anything making it through.

Steve