Pump flow rate questions (physics)

[Sean Clark]

This is false, see below.

Ok, fair enough. I'll get back to my physics classes.

 

[JNalley]

Correct, if we are assuming that the length of the pipe is the same in each tank that's above the water

Well, it wouldn't be, right? The display is in the same location let's say 14 ft above on the second floor, so let's also say that the reservoir is 30" deep. If you place the pump at the bottom of that 30" vs the top of that 30" you've knocked off 2 feet or so of plumbing, which in my mind makes for less loss...

 

[edd59]

size of pipe, length, fittings and typ of pipe [corrugated or smooth] all effect head pressure

 

[TMB]

Well, it wouldn't be, right? The display is in the same location let's say 14 ft above on the second floor, so let's also say that the reservoir is 30" deep. If you place the pump at the bottom of that 30" vs the top of that 30" you've knocked off 2 feet or so of plumbing, which in my mind makes for less loss...

Normally you would be right, however in this case the head pressure doesn't begin until the water rises above the tank level it's sitting in.

 

[edd59]

Well, it wouldn't be, right? The display is in the same location let's say 14 ft above on the second floor, so let's also say that the reservoir is 30" deep. If you place the pump at the bottom of that 30" vs the top of that 30" you've knocked off 2 feet or so of plumbing, which in my mind makes for less loss...

head pressure starts at water surface

 

[JNalley]

Normally you would be right, however in this case the head pressure doesn't begin until the water rises above the tank level it's sitting in.

head pressure starts at water surface

Thanks! this I did not know

 

[KStatefan]

This is false, see below.

That equation is to find head loss due to friction in a pipe.

 

[KStatefan]

The reason is that the larger pipe has more water weight in it causing a significant increase in head pressure.

 

[Dburr1014]

head pressure starts at water surface

Yes, water surface. Doesn't matter if the pump is in 1 for of water or 100 feet of water. What matters is above the surface, that is head pressure.

 

[TMB]

OK after revisiting this I stand corrected. @KStatefan and @Sean Clark are right, my apologies to you both. Flow volume will remain the same, velocity will be reduced.

 

[KStatefan]

OK after revisiting this I stand corrected. @KStatefan and @Sean Clark are right, my apologies to you both. Flow volume will remain the same, velocity will be reduced.

No apologies needed this forum is here for people to learn. I am do not know much about anything reef related except water flow.

 

[Sean Clark]

OK after revisiting this I stand corrected. @KStatefan and @Sean Clark are right, my apologies to you both. Flow volume will remain the same, velocity will be reduced.