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Pond aeration compressor hot

F

Fred Werring

Well-known Member
Got a Thomas 2660 wobl piston pump for pond aeration, and it runs hot...hot enough you cant touch it.

I've read a few places that if you restrict the intake, it will run cooler.

Seems counter-intuitive to me, but I don't know.

Wouldn't think I've got a restriction on the output side, running 1/2" line to 8 8" long air stones.

Thoughts?

Thanks

Fred
 
I would not restrict either the output nor input on a piston pump, better to bleed off.

What is discharge pressure and CFM running?
 
(quoted from post at 19:12:58 07/11/16) Got a Thomas 2660 wobl piston pump for pond aeration, and it runs hot...hot enough you cant touch it.

I've read a few places that if you restrict the intake, it will run cooler.

Seems counter-intuitive to me, but I don't know.

Wouldn't think I've got a restriction on the output side, running 1/2" line to 8 8" long air stones.

Thoughts?

Thanks

Fred
Click to expand...

I never thought of it like that but if you restrict the intake the compression "heating" would/could decrease. So, perhaps it would run cooler. However, it is also pumping less air and consuming electrical power working against the intake side vacuum.

You could put a pressure gage on the discharge line after the pump. Without line loss and air stone restriction you would measure approximately the water head pressure. Water head pressure is equal to the depth of the air stones to the top of the water, divided by 2.31 Psi per foot of depth. For example, assume your pond is 10 foot deep and the air stones sit on the bottom. We have 10ft / 2.31 ft/Psi = 4.3 Psi water head pressure.

If you are not good a math, just pull the air stones up on the bank and read the pressure gage.

Many of those installations have the air pump in an enclosure to reduce noise. Without air flow across it the pump will run hot.
 
Looking at the manual, there are 2 different models of 2660 compressor. One is rated for 40 PSI, the other 35 PSI. A gauge would tell if it is being over pressured.

Sense it is also a vacuum pump, restricting the intake would reduce the pressure, but first you need to know where the pressure is at, and if it is over pressure, determine why.

The manual also says the max ambient temperature is 100F. Where is the pump located? Does it have a good supply of free air? If it is in the sun or hidden under a cover, it may be exceeding the ambient.
manual
 
Restriction causes the pump to work ia a partial vacuum. thus less air to pump. When you put your hand over the nozzle of a vacuum cleaner, the motor speeds up dramatically because it has less air to put through its pump. Jim
 
I thought about restriction of the intake, but was then concerned that the airflow might help cool the pump, thus went with bypass on outlet.
 
The volume through the stone might be restricted. putting a pressure gauge on it at the pump might be good. Jim
 
At sea level, air weighs 14.7 psi.......The pressure differential when at a full 30" of vacuum. That's less than half of what it runs when pressurizing
for this application as I read herein. Less work, less amperage, less loss, less heat.
 
I was hoping you guys were going to tell me they always ran hot, and not to worry.

Oh well

Troubleshooting time

Thanks

Fred
 
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