Fx5 Owners: Flow Testing @ Different Heads?
- Thread starter Jgray152
- Start date
If i may inject a thought here:
The type of pump, more specifically, the impeller design of the pump needs careful consideration.
The loose, expeller vane set-up normally found in aquarium pumps does have limitations.
Granted, I admit, my expertise comes from the fire service but pumps are pumps and water is water.
Pumps can be designed to specifically combat certain head heights but not all pumps perform the same.
Water gains or loses 5psi/10ft of elevation. This isn't a big deal for pumps designed for gpm. It is a big deal for pumps designed for gph.
Just offering some different angles to this conversation, hope it stires some thought.
Respectfully,
FireMedic.
The type of pump, more specifically, the impeller design of the pump needs careful consideration.
The loose, expeller vane set-up normally found in aquarium pumps does have limitations.
Granted, I admit, my expertise comes from the fire service but pumps are pumps and water is water.
Pumps can be designed to specifically combat certain head heights but not all pumps perform the same.
Water gains or loses 5psi/10ft of elevation. This isn't a big deal for pumps designed for gpm. It is a big deal for pumps designed for gph.
Just offering some different angles to this conversation, hope it stires some thought.
Respectfully,
FireMedic.
The Fx5 uses an enclosed vane impeller. Much more efficient than open van impellers used on most filters.
So I was reading THIS and it does seem that the positive suction head does increase the discharge head compaired to a pump that has a zero to negitive suction head and a positive discharge head.
Its basically telling you to get the Total Discharge Head (TDH) you need to subtract the Suction Head from the Discharge Head. Not including fittings which increase the head. So on paper, The fx5 could be use with a Suction and Dischage head of equal distance of 30'. Not taking into considerations for friction loses and elbows.
Thanks Chompers. Now I am just wondering why filter manufactures put the max discharge head on their filters specs.....
If the Fx5 has a max discharge head of 10' then they must be talking (Assuming) about a suction head at zero ft right?
So I was reading THIS and it does seem that the positive suction head does increase the discharge head compaired to a pump that has a zero to negitive suction head and a positive discharge head.
Its basically telling you to get the Total Discharge Head (TDH) you need to subtract the Suction Head from the Discharge Head. Not including fittings which increase the head. So on paper, The fx5 could be use with a Suction and Dischage head of equal distance of 30'. Not taking into considerations for friction loses and elbows.
Thanks Chompers. Now I am just wondering why filter manufactures put the max discharge head on their filters specs.....
If the Fx5 has a max discharge head of 10' then they must be talking (Assuming) about a suction head at zero ft right?
I believe that canister filters are much more efficient as far as headloss because the intake creates a siphon. I think that the siphon in the intake is very important to the flow because when you hook a canister to a sump and have the output in the tank you get an amazing flow reduction, with the same height. On my 75 gallon tank (about 6 feet from floor to top) a magnum 350 (with micron cartridge, bluebonded, and various other medias I stuff into the empty spaces installed) I get about 300 gph of flow. Now, if I hook it to the sump and put the outflow in the tank, I get just about 120gph. I think that canisters rely A LOT on the fact that gravity is on their side as far as inflow.
