Tubing's effect on pump performance
The
size of tubing and length of tubing can also
affect pump performance. First, the size of
tubing must be correct or the water flow will
be restricted, reducing the efficiency of the
pump.
The
demonstration below illustrates this point.
All three of these containers collected the
discharge from a 700 GPH pump for 10 seconds.
On the left 3/8" tubing was used. In the
middle, V^ tubing was used and on the right,
3/4 " tubing was used. Clearly, flow was
restricted from using the small tubing sizes.
The
following chart should be used to select tubing
appropriate for each pump size. It shows the
maximum flow rate for each size of tubing.
| Max
Water Flow in Gallons/Hr |
Inside
Diameter of Tubing |
| 300 |
1/2" |
| 720 |
3/4" |
| 1200 |
1" |
| 2000 |
1
1/4" |
| 3000 |
1
1/2" |
| 4800 |
2" |
| 6000 |
2
1/2" |
| 9000 |
3" |
| 12,000 |
4" |
Second,
the length of the tubing must be considered
because of friction inside the walls of the
tubing. A rule of thumb is that ten feet of
tubing is the equivalent of one foot of head
height.
Courtesy
Aquascapes Design Incorporated
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