topconker
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« on: July 09, 2012, 07:46:13 AM » |
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OK, I'll admit this is a dumb question but could do with a bit of advice about air compressor fittings.
I've got a Draper 50 litre compressor marked as model CT 241 which is fitted with a bayonet type connector which I think is 1/4" which is fine to run a small air drill etc but really need a larger bore for an impact hammer etc. and would like to chgange the bayonet fittings as they are expensive to buy for the rest of my air tools.
I've been told the connectors come in 2 sizes, 1/4" and 3/8" but surely airlines are 1/2" so I'm a tad confused.
Can anyone explain in single syllables what I should fit?
Cheers,
TC
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tbone
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« Reply #1 on: July 09, 2012, 07:01:25 PM » |
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The connector sizes you quoted are not hose sizes, they refer to the thread size of the fittings.
If your using 1/4" BSP fittings, the hose could be 6mm, 8mm or 10mm I.D.
13mm I.D is ready available and uses 1/2" BSP fittings.
Increasing the bore size of the hose will allow more air flow (CFM) whilst maintaining pressure (PSI) but will affect the cycling of the compressor.
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NO I WON`T. aye ok then, i will
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topconker
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« Reply #2 on: July 09, 2012, 07:27:34 PM » |
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Thanks Tbone, so should I change the fittings to 3/8"
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The most precious thing you can give your kids is your time.
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tbone
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« Reply #3 on: July 09, 2012, 07:56:54 PM » |
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I`m not that up on air compressors, but the first thing to look at is the CFM ratings.
Check the ratings for the tools you wish to use, then check that your compressor is capable of meeting them at the specified PSI. All air tools will give the CFM rating in their literature.
CFM is Cubic Feet per Minute, this is the amount of air the compressor can supply.
PSI is Pounds per Square Inch and is the pressure that the air is supplied at.
If your compressor CFM matches the highest CFM of the air tools you wish to use, but your finding a `lack of power`, then increasing the hose bore will allow more air through, but it`s worth checking your compressor spec first.
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NO I WON`T. aye ok then, i will
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tbone
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« Reply #4 on: July 10, 2012, 08:21:50 AM » |
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Now, the next step involves some math`s so bare with me  To work out air flow through an orifice we multiply the orifice area (inches squared) by pressure (psi). To find the area we multiply the radius squared by Pi ( Pi = 3.14). So its radius x radius x 3.14 = area in square inches x PSI = CFM. Easy aint it Now for the example.... I picked this at random, but a Sealey tools 3/4" impact wrench requires 7 CFM @ 90 PSI the area of a 1/4" orifice is 0.049 in2 0.049 x 90 (psi) = 4.41 CFM Clearly the 1/4" is not allowing enough airflow to run my example air tool. Lets up the hose size to 3/8" that has an area of 0.1103 in2 0.1103 x 90 (psi) = 9.927 CFM More than enough to run the air wrench, even allowing for pressure drop (which I wont go into for fear of over complicating things) |
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NO I WON`T. aye ok then, i will
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topconker
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« Reply #5 on: July 10, 2012, 09:34:46 AM » |
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PHEW!!!!!!!!!!!!!!!!!!!!!
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The most precious thing you can give your kids is your time.
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merv
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« Reply #6 on: July 10, 2012, 03:23:30 PM » |
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PHEW!!!!!!!!!!!!!!!!!!!!!
PHEW indeed he just blew my mind,fair play tbone you lost me  |
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Why do every five minute job take all day, and
if it can go wrong it will go wrong
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tbone
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« Reply #7 on: July 10, 2012, 04:51:20 PM » |
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PHEW!!!!!!!!!!!!!!!!!!!!!
PHEW indeed he just blew my mind,fair play tbone you lost me Aww, you say the sweetest things mate |
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NO I WON`T. aye ok then, i will
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topconker
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« Reply #9 on: July 10, 2012, 06:15:12 PM » |
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LOL Bandit.
I've spoken to the techie people in Draper who tell me I can't change the connector from a 1/4" to 3/8" BSP fitting anyway so b=ggered what to do now.
Can I just not use a larger bore pipe?
TC
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The most precious thing you can give your kids is your time.
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tbone
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« Reply #10 on: July 11, 2012, 05:21:48 AM » |
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Well you can replace your connector, ring them back up n tell them I said so As I mentioned before, the 1/4 & 3/8 that you are quoting are thread sizes and not hole sizes. To change to a 3/8" PCL connector would be a simple matter of using a converter connection,1/4" male end and 3/8" female end. There is no point in changing the connector though as you will not increase the bore size, they are all around 5mm. Your only option is to increase the hose size, but as said before, it will affect the running cycle of the compressor. |
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NO I WON`T. aye ok then, i will
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voodoo
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« Reply #11 on: July 11, 2012, 08:56:03 PM » |
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Ah missed this thread earlier....I run 2 different airlines 1 for my Sprayguns thats a 8mm Hose & my Airtools ie Impact Gun & DA sanders runs a 10mm hose....really notice the difference if I plug in the wrong hose lol but kept is simple & have all 1/4 connectors as made up my own hoselines.....Voodoo....
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English by Birth..Biker by choice....
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topconker
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Posts: 85
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« Reply #12 on: July 12, 2012, 08:07:50 AM » |
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Thanks guys,
Decided to keep the 1/4" connector size and will change it from the bayonet type to a PCL connector which will mean I can run all my tools.
Will also look at up sizing the hose.
Like all things, it's never as simple as you think at first.
Cheers,
TC
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The most precious thing you can give your kids is your time.
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steven brock
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« Reply #13 on: July 19, 2012, 07:01:13 AM » |
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Ah that makes sense I wondered why my 23CFM compressor didn't work that well on my air sander  new hose today then..... |
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steel wasn't invented to make bloody staples with!
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