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vacuum pump not tractor
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mdm1 View Drop Down
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Joined: 12 Sep 2009
Location: Onalaska, WI
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    Posted: 21 Mar 2025 at 12:10pm
This is not tractor related but I know there are people on here with tons of info all around. If you use an axillary tank with a vacuum pump can you increase the vacuum. If the pump is rated for 3.5 CFM will that increase with the use of the tank or will that be it? This is in relation to a vacuum filter system for maple syrup. Thanks for any and all replies! (Hope there are some)
Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK!
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jaybmiller View Drop Down
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Joined: 12 Sep 2009
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Points: 24221 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jaybmiller Quote  Post ReplyReply Direct Link To This Post Posted: 21 Mar 2025 at 1:14pm
No.....3.5 CFM is the max. 3 and a half cubic feet per minute. Having a bigger storage tank doesn't gain you more CFM.

Think of it this way... well pump rated for 6 GPM, makes NO difference if you're pouring water into a pail or bathtub... the 'rate' is still only 6 GPM.
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mdm1 View Drop Down
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Joined: 12 Sep 2009
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Points: 2660 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mdm1 Quote  Post ReplyReply Direct Link To This Post Posted: 21 Mar 2025 at 1:32pm
Thanks that's what I had thought. 
Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK!
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It won’t make a higher level of vacuum, and at steady state operations it won’t be pumping down any quicker, cfm is cfm.

What it might provide is a little surge. Like if you pumped the tank down, then opened the valve to the rest of the system there would be a surge, how much would depend on the size of the tank compared to the rest of the system. Probably of no use.
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Points: 5925 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DaveKamp Quote  Post ReplyReply Direct Link To This Post Posted: 21 Mar 2025 at 8:55pm
The challenging thing about working with vacuum systems, is that the moisture content of anything IN the vacuum can have a dramatic effect on how effectively your system will be.

The general description of vacuum systems fall into three categories... 'low' vacuum, 'high vacuum', and 'ultra high vacuum'.  What you're doing probably falls in the 'low vacuum' realm... 

The difference between each range, has to do with what's really happening, and some vacuum generating systems are effective in low, some in medium, and some in high, but a high-vacuum pump will not be efficient or effective in low-vac circumstance, and a low-vacuum pump won't be effective at the high vacuum range.

low-vacuum pumping is generally referred to as 'roughing', and the distinguishing circumstance is moisture.  At standard atmospheric pressure, water boils at 212F...

When water boils, it is changing from a liquid, into a gaseous state, and in the gaseous state, it occupies 1700 times' it's original volume.  That means 1 cubic foot of water, expands to 1700 cubic feet of space.

When you take a volume of atmosphere, or some material that's been in atmospheric exposure, there's moisture.

Water boils at a much lower temperature when the atmospheric pressure is lower (pronounced 'in a vacuum'.).  When you pull atmospheric air down to about 27 inches of mercury, water boils at room temperature.  As you pull it down towards 30 inches, it drops rapidly to a boiling point of -90F.

When 'roughing', you'll pull a vacuum for a short time, and once you reach the point where moisture in the volume starts to boil off, the vacuum pump will just have to keep pulling volume, and you won't achieve any more vacuum UNTIL the water has all boiled off.   This is why, if you're working on charging up a new air conditioning system, you'll have a roughing pump on the system, and it'll go from standard atmosphere to say... a half inch of mercury or so, and just stay at that level for two days.  It SEEMS like nothing's happening, but in reality, moisture inside all that plumbing is boiling off, and getting pulled out slowly by the roughing pump.  Eventually, if there's no 'leaks', pressure will start dropping again, and you'll get into the 'high vacuum' range.

Without knowing more about your setup, I can only guess that your system has lots of volume, and lots of moisture with which to contend.   If that's the case, running two roughing pumps in series (one through the other) gains you nothing, but if you run two in parallel, you might be able to increase your evacuation RATE, at least, until you reach a pressure limit.

Your pump's pressure limit is a combination of it's design efficiency/capacity, and it's ability to stay sealed.  IF you have an oil seal on the pump's rotor shaft, and that seal starts leaking oil into the vacuum chamber at say... 3in-Hg, then you'll have very little ability to pull it down farther.
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mdm1 View Drop Down
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Joined: 12 Sep 2009
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Points: 2660 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mdm1 Quote  Post ReplyReply Direct Link To This Post Posted: 22 Mar 2025 at 4:53am
Thanks for the replies. Our system is very basic. What it amounts to is 2 buckets with the bottom cut out of the top one. Filters are between the buckets and the vac is connected to the bottom bucket. Pour syrup into the top turn on the vac and the syrup is pulled through the filters into the bottom bucket. My son bought a vacuum pump that is to small and that is the reason for the question. 
Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK!
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Les Kerf View Drop Down
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A vacuum 'storage' tank is necessary on a dairy milking system so as to allow changing milkers on one cow without having the other milkers all fall off. We run ours at about 15" Hg.
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Originally posted by mdm1 mdm1 wrote:

Our system is very basic. What it amounts to is 2 buckets with the bottom cut out of the top one. Filters are between the buckets and the vac is connected to the bottom bucket. Pour syrup into the top turn on the vac and the syrup is pulled through the filters into the bottom bucket. 


THANKS --- you have just given me an idea as to how to speed up the excruciatingly slow process of gravity-feeding dirty engine oil through a filter.

As for vacuum and tanks, what someone already said about the "surge" is dead on.

I have RedLine Vacuum-over-Hydraulic brakes on all of our trailers that don't have air brakes.

There are big vacuum tanks under the neck of each trailer and also on the trucks --- BIG vacuum tanks.

Without these tanks under vacuum, we wouldn't get the immediate black-top grabbing response at the wheels.

Remember, no matter how quick and stout the pump, you can never have more than 29-inches Mercury; my gauges usually show 27" or 28" 
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