overflow standpipe diameter

[fishmaven]

Your flow rate is going to be determined by the return pump you use. If you feel that the drain tube will be FILLED by the water going through the tube, then a bigger tube should be used. If the level of the tank is determined by the overfow box rather than the height of the tube, the set-up would run even without a tube, by just placing a sponge over the hole.

It's not just the size of the bulkhead that determines the flow... if there's just 1/2 inch of water in the oveflow box the rate is different than if the box were full of water. Pressure has something to do with this also...

 

[Infblue]

thanks everyone!

 

[CHOMPERS]

Just thinking (ouch), will the larger pipe cause girgling because of more water flow or let let the air flow back out better?

Dr Joe

.

The gurlging is caused by air injestion. The idea of the larger stand pipe is to provide water flow up to the one inch limit of the fitting while at the same time allowing the escape of air before it is sucked down the plumbing.

 

[Potts050]

The gurlging is caused by air injestion. The idea of the larger stand pipe is to provide water flow up to the one inch limit of the fitting while at the same time allowing the escape of air before it is sucked down the plumbing.

Is it not possible to solve the gurgling problem by venting the drain plumbing?

 

[hillbilly]

Is it not possible to solve the gurgling problem by venting the drain plumbing?

Of course.

 

[hillbilly]

Your flow rate is going to be determined by the return pump you use. If you feel that the drain tube will be FILLED by the water going through the tube, then a bigger tube should be used. If the level of the tank is determined by the overfow box rather than the height of the tube, the set-up would run even without a tube, by just placing a sponge over the hole.

It's not just the size of the bulkhead that determines the flow... if there's just 1/2 inch of water in the oveflow box the rate is different than if the box were full of water. Pressure has something to do with this also...

Yes, but in the end, the size of the bulkhead does determine flow. Only so much water is going to flow out the one inch bulkhead at a time. It doesn't matter if you have a four inch standpipe, the water still has to flow out that one inch bulkhead. However, I see what you're saying.