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drain hole size

drain hole size

drain hole size

(OP)
Hello all

one of our products maintains a water level of 1/2" when not in use. Looking at adding a slow type of drain hole(about 1/8" dia) in aluminum that will always be "peeing" while in use but will allow the remaining water to drain when not. Wondering if anyone has any knowledge of hole shape/size/dia data so this low head height water will drain without just covering over the hole due to surface tension of the water. Maybe the hole should be tapered? maybe a radius on the top edge? Trying to get a feel for any applications out there before testing....

RE: drain hole size

Maybe an off the shelf small NPT "muffler" like used on a vacuum pump or air tools, would have the desired effect of wicking out stagnant water, but also reducing "active" leakage better than an open hole. Will only work if it drips, meaning you might need to tie a string to it.

RE: drain hole size

Small holes tend to plug with debris easily. What is the problem with a larger hole?

RE: drain hole size

(OP)
a larger hole would cause loss of pressure in the chamber in question during use.

a micron filter we use upstream should negate this some but its still a concern..I agree.

Our options here are limited.

RE: drain hole size

Sounds like you need a drain line with a float valve.

RE: drain hole size

Sounds like a toilet to me??

RE: drain hole size

(OP)
Thanks everyone

I'll have to ponder the drain line with a float...

Am testing different shapes of small drain holes this week.

RE: drain hole size

I think MiketheEngineer may have been suggesting a P-trap, like you find under a sink. These are commonly used in condensate drain lines of A/C units. It allows water to drain freely but blocks any vapor flow as long as the pressure is greater than the liquid column height.

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