Thread: Math, Vac Performance

I wonder about the lift a vac motor produces. I think a vac motor can always reach its peak lift in time on any hose length under 200'.

A thought on performance, "Lift Time".

Will more air flow improve my lift time?

Will I have more air flow with the power of lift?

Lift power gives better air flow when a wand makes contact to wet carpet.

Math:

More hose will delay lift time and air flow, a 20% delay in lift time and air loss leads to a 50% reduced performance.

I would guess... I lose about 10% lift time and air flow on first 25' of 2" hose using 1 - 3 stage vac, a 25% loss in performance.

With a hose run of 100' 2" hose, I lose up to 25% lift time and air flow using one vac. this is then a 60% loss in performance.

Using 2 vacs with 3 stages in parallel, I will gain a % of lift time back and % of air flow,

With adding more motors (parallel) to my system will incress air flow to maintain a peke lift performance.

Originally Posted by CCWorks

I wonder about the lift a vac motor produces. I think a vac motor can always reach its peak lift in time on any hose length under 200'.
Remember 50 ft of 2 inches hose has over than 1 cubic feet, and 1 cubic feet can hold 7.45 gallons of water, so 200 ft of hose will be over 28 gallons of water if you add the recovery tank another 12 gallons we talk 40 gallons, now if you have motors on parallel, you will empty the air of the tank a lot quicker than the motors on series set up.
A thought on performance, Lift Time.

Will more air flow will improve my lift time?
Yes, it will improve a little bit
Will I have more air flow with the power of lift?
yes a little bit, but the most important thing is you will keep the air flow at its peak, because the friction won't affect it so much, and because the lift is the strength of pulling in we put it in that way, specially when the wand is down.

Lift power gives better air flow when I make contact with wand to wet carpet.

Math:

More hose will delay lift time and air flow, a 20% delay in lift time and air loss lead to a 50% reduced performance.

I would guess I lose about 10% lift time and air flow on first 25' of 2" hose using 1 - 3 stage vac, a 25% loss in performance.

With a hose run of 100' 2" hose, I lose up to 25% lift time and air flow using one vac. this is then a 60% loss in performance.

Using 2 vacs with 3 stages inparallel I will gain a % of lift time back and % of air flow,

With adding more motors (parallel) to my system will incress air flow to maintain a peke lift performance.

really nice post, too much to say about it.

Greg & Locko;

Extractors generate a fixed amount of lift at the machine.

Each 25' or 50' length of vac hose drops the lift depending on airflow.

2" hose has 1/4th the loss of 1.5" hose. That is why it is used on TM's and long hose runs for portables.

Each hose length decreases the lift,
which decreases the Airflow.

Adding a vac motor increases the Airflow, regardless of being in series or parallel.

The key is the maximum lift available at the wand lips,
with the wand on the wet carpet.

Here is a good article on lift and airflow written by my friend,
Steve Brandt, former president of Hydramaster:

http://www.icsmag.com/Articles/Featu...00f932a8c0____

Larry

What I want to know is...

I take a **lift reading at the machine, the **lift reading shows 100 **lift with no air flow.

I add a pipe to the same machine with a length of 1000 feet, It does not matter the diameter, 1, 2 or 6 inches. The pipe has only air.

Now I stop all the air flow, take another **lift reading at 1000 feet out. I should get the same **lift reading of 100.

So... my point is, if I plug the air flow, no matter the length of the pipe, in time, I should see the same amount of **lift.

Pipe is not a flex hose.

**Lift is suction power

Cobb,
with A HIGHER LIFT MACHINE, you will have more lift at the wand always
after 100 ft of hose my eclipse lost from 22 hh to 19 hg, still it is a lift after 100 ft of hose. and i can tell thise, the carpet come out cleaners with gilde or not glide, and drier if you use an unglided wand.

lift decrease if you don;t have enough airflorw, or let me say like this, youj need to evacuate the air from the vacuum chamber and the line real quick, otherwise you won;t have enough lift. you get lift when you have no air on the lines and chamber.

When I add more hose, I will lose air flow to resistance / friction.

Increased air flow rates over your normal air flow rate will also add more resistance / friction on the same amount of hose.

Higher air flow rates and the hose length will bring down air flow.

Lift power will help pull the air though the hose, higher lift power will increase the air flow rates.


Go figure

Very complicated right!

22 hg vary sometimes 21.5 hg, not big deal. if i tell you how i did it, you will se more machine with the same thing, still i don't think is the best set up on the planet, but it is really powerful.
22 hg and 120 cfm
one cord you need to plug it to a 20 amps and another to 15 amps.
working fine.
still i can do some improvements but i am tired of that.