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How strong are typical shop vacuums? Answered

As in, how many mmHG would it be able to sustain consistently if there are no losses from the hose. I want to know since I want to substitute an expensive lab grade pump with something I already have if it can do the same job. I primarily intend to use it to filter water from an iron oxide powder (I want the oxide so I can try my hand at making some thermite).


For what it's worth, my shop vac will pick up sizable rocks, carpets, and I strongly suspect cats (though the cats have never been willing to risk being near it so that experiment has not been tried).

Try it, as it really depends upon what particle-size your powder is and your filter.
What's the lab-pump, diaphragm?


The lab pump is one I don't have, hence the use of a shopvac.

Back to what I said before, it depends upon what particle-size your powder is and your filter. A shop-vac will do the job, but arrange the rest to suit it.


why not evaporate most of the water off and leave it in the sun to dry??


7 years ago

Shop vacs com in all sizes and powers, from whimpy little things to honkin monsters that can suck the water out of your basement. Just depends on what you want and how much you have to spend.

My shopvac would eat that up. It's pretty powerful.

Why not just pour your slurry into a cone filter and let gravity extract most of the water, then spread the powder and let evaporation extract the rest?

.  http://en.wikipedia.org/wiki/Vacuum_cleaner#Suction
.  Most home/shop vacs are low-pressure/high-volume devices. Most lab vacuum pumps are high-pressure/low-volume devices. Whether or not your shop vac will work depends on your filter media, viscosity of oxide slurry, &c.


Also most home/shop vacuums use the air they suck in / blow out to cool the engine. So, if you almost block the airflow, the vacuum might overheat.