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Our Founders Website -> Locate A Certified Roof Cleaner | Roof Cleaning Institute Of America -> Roof Cleaning Pictures -> In compressors think cfm not psi
Post Info TOPIC: In compressors think cfm not psi
AODpumpman


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In compressors think cfm not psi
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Why does a 1 HP compressor put out 100 psi and a 10 HP put out 100 psi. What is the difference? The difference is SCFM or Standard cubic feet per minute. SCFM is the Gallons per minute of air. When you are looking at the purchase of a compressor, look at SCFM delivered at 100 PSI. Equipment like air diaphragm pumps need a givin SCFM of air to work at there suggested capacity. If you supply less SCFM of air than they want they will either work slowely or not work of all. I hope this was helpful.  Steve

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Steve Weirich
Apple Roof Cleaning Tampa FL (813) 655-8777


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Thanks Steve !
I use the Yamada 1/2 inch pumps with 11 cfm at 90 psi Compressors.
I noticed a big difference using a 18 cfm compressor.
The 18 cfm compressor has a 30 gallon air tank.
The 11 CFM has only 9 gallon air tank.

What do you think of the idea of using a larger air tank on a  compressor  ?
The torpedo compressors we use have only 9 gallon capacity.



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SP Cleaning


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Hey Chris, Hope all is well in Tampa. I went to buy the Big Dawg compressor from HF in Pineville NC on Mon. They had 4 in stock but would not sell them. cry I was told they are on hold (Recall) till further notice. All they could tell me was there was a part missing?? confuse I was not happy, but purchased the wheelbarrow style they had on sale for $399. plus I had a 20% off coupon. I also purchased the 3/8 Versamatic Poly pump w/ teflon diaphragm $124. from Dultmeier. I just got it yesterday. This will get me started. I told HF to let me know when the compressors will be available again. When it is available, I will go get one, as well as order the Yamada I mentioned last week. I figure the setup I just got will make a great backup for ROOF CLEANING to the 18cfm compressor/Yamada pump combo I will soon get. Thanks again for all the help, Time and effort you put in to this forum.

Chris


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Roof Clean USA Georgia 229-227-0000


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Thank You Steve,

Your expertise will be very valuable to the new and veteran roof cleaner looking to get an air diaphragm pump or upgrade to one in the future as opposed to other less reliable methods of pumping roof cleaning agent to its intended destination.

Roof Clean USA loves the ALL-FLO 3/8" KV-038 in Kynar and Viton.


ALL FLO KV- 038 pump with viton and maxpass pic.gif


This pump has the amazing MAXPASS valve that allows up to 1/4" undissolved solids to pass thru with ease, unlike other air pumps which clog, this valve is "PURE GENIUS"

This pump is so reliable we are TRULY amazed, pumps up to 9 Gallons Per Minute and is virtually STALL FREE.

Our open flow tests confirm 6.8 gallons per minute open hose (no nozzle restriction) at 200 feet of 5/8" hose and 1/2" Manifold on a Titan reel.

Put a O degree with a # 30 Orafice and this pump will shoot 30-35 feet without breaking a sweat.

This pump is well thought out, easy to field repair with basic tools, and is priced right.


All that adds up to more work getting done with less down time.

Thanks STEVE of ALL-FLO, for being a LEADER in your field and for being kind enough to become a member of Roof Cleaning Institute OF America and to be thoughtful enough, from a technical support standpoint answer our roof cleaning pump questions.

This is what I call CUSTOMER SERVICE, good ol fashioned USA style.

ALL-FLO Air Diaphragm PUMPS Rock!

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AODpumpman


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Hello Chris:

I think I have figured out how to answer questions with Dave's help.

A larger air tank works like a storage area for air. A larger tank will allow for more SCFM to be delvered to a pump for a short period of time until the extra air that was stored by the tank was used up. I will try to explain better by an example. Say you have a pump that can run at full speed at 10 cfm and your compressor that is mounted to your tank can deliver 5 cfm. A small tank say 1 Gallon may allow you to run the pump at 10 cfm for 5 seconds and a large tank may allow you to run the pump for 30 seconds. As you can see the larger tank did help but for only a limited amount of time. My guess is that a larger tank in the roof cleaning business may be of some benefit if you only are cleaning a section of roof for 30 seconds then close the nozzle and do some other work. If you are cleaning for more than 30 seconds your pump will slow down to the 5 cfm usage. (I did not do any math with this example so the times are not exact)

When I have some extra time i will have to figure out how to do the math. I did know how to calculate it out at one time.

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Steve Weirich
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