Pipe and Tubing Recommendations
A pump's description may provide a
discharge size of 3/4", 1", or some other size. However, this does not mean
that you should use this size of tubing or pipe for the discharge. Some pumps
come with a step down outlet to allow you a choice when selecting the tubing
size to connect to the pump. There are several variables for determining the
plumbing size for your pond. The " How to Select a Pump" section of
the web site will help you when sizing the plumbing for your application.
As a general rule you can use the
following pipe sizes for the average pond:
- For pumps with flows up to 300 gph use 1/2" tubing
- Flows from 300 to 600 gph use 3/4" tubing
- Flows from 600 to 900 gph use 1" tubing
- Flows from 900 to 2200 gph use 1 1/4" tubing
- Flows from 2200 to 3500 gph use 1 1/2" flexible
- Flows from 3500 to 5000 gph use 2" flexible PVC
- Flows from 5000 to 12000 gph use 3" flexible PVC
When connecting a submersible pump in the pond bottom with a flow rate above 2000
gph you may want to use 1 1/4" tubing to come out of the
pond (to allow you to easily pick up the pump for cleaning the
inlet) and then connect this tubing to a larger size flexible
PVC pipe (which is not quite as flexible as tubing) to gain
more flow from the pump. When connecting (for instance) 1 1/4"
tubing to 1 ½" flex PVC pipe you will need a 1 1/2"
coupling, 1 1/2" x 1 1/4" FPT bushing, and a 1 1/4"