Good article on CFM, Waterlift. |
Post Reply | Page 12> |
Author | |
Johnsmith808
Groupie Joined: 22/December/2007 Status: Offline Points: 40 |
Post Options
Thanks(0)
Posted: 23/December/2007 at 5:20pm |
This is a very informative article about the debate over cfm and waterlift:
http://www.hydramaster.com/inside/articles/articles2.asp It's interesting to notice that truckmounts have lifts in the 13-15" Hg range, which is equivalent to around 175"-225" waterlifts, yet at cfm's around 300-500 or so. So when you consider running a portable with vacuums in a series, say 2-3 stage vacs, you will get upwards of 220" of waterlift, but the cfm will drop down to 90 or so. When you run vacs in parallel, the waterlift will be around 140", which is around 10" Hg, but the cfm will then be at 200. It would appear that running these vacuums in parallel would closer mimic the balance of cfm and waterlift that truckmounts use, but of course scaled back to portable levels. When vacs are run in a series, the lift is as high as truckmounts, but the cfm is proportionately far lower, thus throwing the balance off. As the article pointed to, only recently have more become aware of this balance. Of course there have obviously been some who have been pioneering this understanding for many years, but the great majority haven't been listening, including your's truly I must admit. Edited by Johnsmith808 - 23/December/2007 at 5:22pm |
|
Sponsored Links | |
FriendlyHammer
Master Carpet Cleaner Joined: 08/July/2007 Location: United States Status: Offline Points: 1383 |
Post Options
Thanks(0)
|
Imagine you made a machine with 1,000,000 inches of waterlift and only 1 cfm. It would sell like hotcakes, but it wouldn't clean a darn thing.
|
|
Ed Valentine
Carpet Cleaning Specialist Joined: 14/September/2004 Location: United States Status: Offline Points: 770 |
Post Options
Thanks(0)
|
Wonder where they learned that??????????? (!!!!)
merry Christmas; Ed Valentine cross-american corp. |
|
Johnsmith808
Groupie Joined: 22/December/2007 Status: Offline Points: 40 |
Post Options
Thanks(0)
|
Would glides work better on a system running in a series or parallel?
|
|
John L
Carpet Cleaning Guru Joined: 29/November/2004 Location: I'm Right Here! Status: Offline Points: 4013 |
Post Options
Thanks(0)
|
Buy something F A S T and make some loot..!
|
|
Johnsmith808
Groupie Joined: 22/December/2007 Status: Offline Points: 40 |
Post Options
Thanks(0)
|
Just when I think I understand this whole cfm and waterlift thing, I
have another question. Say you run a machine with dual 3 stage
vacs in parallel or in a series. Would running in parallel be
better than running in a series for every hose length?
Say the numbers are Parallel= 140" waterlift and 200 cfm Series = 220" waterlift and 95 cfm Which would do better with 15 ft of hose? 25? 50? |
|
Johnsmith808
Groupie Joined: 22/December/2007 Status: Offline Points: 40 |
Post Options
Thanks(0)
|
I just got an explanation of where vacs in series or parallel would be
beneficial. I'm sure you guys already know this, but please be
patient.
I was told that vacs in a series would be better with low pile, commercial type carpet. I would think that would be because the seal is pretty good at the wand, so lift would come more into play. Vacs in parallel would better suite thicker, residential carpet, due to the seal not being as tight, thus airflow being better. Does that sound about right? |
|
FriendlyHammer
Master Carpet Cleaner Joined: 08/July/2007 Location: United States Status: Offline Points: 1383 |
Post Options
Thanks(0)
|
Parallel. |
|
FriendlyHammer
Master Carpet Cleaner Joined: 08/July/2007 Location: United States Status: Offline Points: 1383 |
Post Options
Thanks(0)
|
Perhaps, but if you've ever seen that carpet, I would think you would wonder what the difference is. That pile is so thin that "pile" is almost an oxymoron. Sure the seal is strong, but how much water can you get in 1/8 of an inch of carpet? |
|
FriendlyHammer
Master Carpet Cleaner Joined: 08/July/2007 Location: United States Status: Offline Points: 1383 |
Post Options
Thanks(0)
|
The shorter the better. Don't go above 50 feet with parallel. And 25 feet in series. I'm sure others have their opinions, but that's mine. Frankly, I would only use more than 20 feet if I were doing stairs or upholstery that couldn't be reached with a shorter hose. |
|
Johnsmith808
Groupie Joined: 22/December/2007 Status: Offline Points: 40 |
Post Options
Thanks(0)
|
Thanks Friendly. I think I'm going to go ahead and turn my
machine into parallel vacs. I'm also going to make the intake on
the recovery tank 2" instead of 1.5. Shouldn't be too hard.
Of course I would then need to run 2" hose.
Yesterday I did a job using 15 feet of hose, and it dried faster than any job I've done recently. It was actually easier to work with 15 feet of hose than 25 feet for the most part as well. The only reason I use 50 feet sometimes is so I don't have to carry the machine upstairs on a two story house. Now I plan on getting a continuous piece of 50 feet 2" hose and running the machine in parallel. And for one story units, I'll stick with the 1.5 inch 15 foot house. Would 2" on such a short hose even matter? |
|
Johnsmith808
Groupie Joined: 22/December/2007 Status: Offline Points: 40 |
Post Options
Thanks(0)
|
Would adding a 3rd 3 stage in parallel for 125" lift and 300 cfm be a
good balance? Or would the lift be a little low for that amount
of cfm. Should I just stick to 2 3 stage in parallel for
125" lift and 200 cfm?
|
|
John L
Carpet Cleaning Guru Joined: 29/November/2004 Location: I'm Right Here! Status: Offline Points: 4013 |
Post Options
Thanks(0)
|
Add it.. I did on my Recoil.. Faster dry times..
|
|
Johnsmith808
Groupie Joined: 22/December/2007 Status: Offline Points: 40 |
Post Options
Thanks(0)
|
Sounds good! Thanks.
|
|
Post Reply | Page 12> |
Tweet |
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Welcome to KleenKuip.com's Professional Carpet Cleaners Discussion Forum!