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Thread ID: 83152	2007-09-21 06:53:00	Air Compresser Advice	rogerp (6864)	PC World Chat

Post ID	Timestamp	Content	User
593437	2007-09-21 11:13:00	I hope there aint a 75 psi restriction my Trader and one Titan run 85psi front and back. The 85psi is on a sticker on the door frame and in the handbook Other Titan has smaller wheels and runs 65 psi. And no problems blowing up with $110 compressor which is about 4 yrs old tedheath	tedheath (537)
593438	2007-09-21 11:39:00	250psi? That is definitely NOT a home handyman job. Is there a tyre place near you go & ask them. They will have professional gear. As an ex Electrician I did a lot of work with compressors. There will be a point where they will be fitted with 3 Phase motors & all the gear that goes with that. I never came across 250psi tho' !!! You don't mean K Pascalls do you? PJ Sorry, I have just checked now, and yes you are right, it is 250 kpa. Does that mean some of these smaller cheaper ones will be able to cope with it?	robbyp (2751)
593439	2007-09-21 22:19:00	Ah well then, if they quote it in KPa, it is metric, so it doesn't really matter what pressure it is. If it was at all critical, they would use real units. (Pascalls are sweets, the unit of similar name is too small to be seen in a pile of hundreds and thousands.)	R2x1 (4628)
593440	2007-09-22 03:30:00	Sorry, I have just checked now, and yes you are right, it is 250 kpa. Does that mean some of these smaller cheaper ones will be able to cope with it? 250kpa ~= 36psi so yeah an elcheapo compessor will do the job fine.	tweak'e (69)
593441	2007-09-22 05:58:00	To fill tractor tyres you need a reasonably big compresser unless you want to wait around for a long time. The little 12volt ones are useless for the job they would self destruct from overheating after a fairly short working life. Even a larger one takes a while as there is a large volume of air required. The one I use for my tractor is about as big as you can run off the normal domestic power supply.	CliveM (6007)
593442	2007-09-22 06:28:00	I thought one puts a fair amount of water into tractor rear tyres to effectively lower the C of Gravity, therefore a smaller compressor would probably do the job.	zqwerty (97)
593443	2007-09-22 10:16:00	look in the 'phone book for "ASH AIR (NZ) LTD"	jayal (1291)
593444	2007-09-22 12:33:00	I hope there aint a 75 psi restriction my Trader and one Titan run 85psi front and back. The 85psi is on a sticker on the door frame and in the handbook Other Titan has smaller wheels and runs 65 psi. And no problems blowing up with $110 compressor which is about 4 yrs old tedheath Oh yeah, tedheath. As usual does not have a clue.	JackStraw (6573)
593445	2007-09-23 00:14:00	The only time I remember tire pressures like 60-85 psi, was on the old "English" bicycles I had in the '60s . They had those skinny little tires that would beat the rims to death if they didn't have enough air in them . Bigger tires use a lot less air pressure . . my 33x12 . 50R15 tires use just 11 PSI on a full-sized Blazer (see it over there ( <- ) in the avatar . ) We use 150+psi for shop tools; air impacts, ratchets, pneumatic chisels/hammers and such, as less than 100 psi wouldn't cut the work load . Typically, adding water or antifreeze or sodium chloride solution to the tractor tires is for traction . I never felt it was for COG needs, but I can see that too . We had Bobcats with water/air, then we went to dense foam for weight and non-puncturability factor later on when rebar was a big problem and we lost a lot of site time with flats . We worked mostly in kitty litter/sand and with just air in the tires, they'd get stuck or just need to use too much power for motion in that environment . When we added the extra weight with the foamed tires, we never had much more traction or getting stuck in sand problems again . Sounds kinda strange to add weight to NOT sink into sand . . but that's the way it worked best . . right Metla? When buying a compressor, you need to consider two options, really . Do you need a lot of air at relatively medium pressure or a small amount (volume) of air at high pressure? If you want a LOT of flow, get a twin cylinder model with two, single-stage cylinders . If you want high pressure at relatively medium to low volume, then a two-stage dual cylinder model is best . The diaphragm (pancake) types are usually for roofing or cabinet contractors . . they are fast, light to carry and can make decent air flow, but not constantly level-use-wise . Nail guns and staplers aren't big on air draw, just a puff at about 75 psi every once in a while is good enough . Most hobbyist and home shop compressors are hybrids and MIGHT be two cylinders, one high pressure and the other high flow with the high flow precharging the high pressure cylinder and then into the tank . This fits a lot of cross-platform functions . If you are running an occasional air tool like an impact gun, then you need to heed the horsepower requirements of the tool . US rules require horsepower for each tool stated on the tool ID plate . I don't know about youse guys though . If you inflate the occasional tire, blow a little paint and clean your shop or equipment with an air blast, then almost any type of reliable compressor will work . If you can see the value of air use/compression horsepower, it's very simple . A high speed hand-held disc grinder can consume 8-10 horsepower . We call these "Dart" units with a 4 1/2 inch abrasive disc, one handed operation like a pistol . A 1/2 inch impact gun, needs usually about 3 horses . A 3/8 inch butterfly will pull about 7 horses to keep up with it . Spray painting requires about 2 horses . These values assume CONSTANT use . Bursts of use or time to wait needing to re-build pressure are all worthy considerations . I can get a 1/2 inch impact to take off a 5-lug tire with a 3/4 horse compressor . . if I am willing to wait between nuts, or maybe I can get one or two at a time and then wait for air to build again . Of course this depends on the capacity of the tank too . . . but the actual compressor is pretty much the deciding value factor here . Some units use a very small tank as they have enough flow and horses to keep up with whatever you might need . You will also maybe dim the neighbor's lights too . At 3 horses, you can pretty much pull 8 or 10 lugs in a pretty fair clip with little waiting for air to build . At 10 horses, I can build the Brooklyn Bridge and run a paint booth at the same time . . . . . well . . . close to it anyway! Just convert to horsepower or watts and it all makes a lot more sense . Fer instance, most home-type washing machines get along quite well on 1/2 to 3/4 horsepower . I have seen some smaller 1/3 horse units that will wash a towel or two and some ladies unmentionables without too much fuss . Add a terrycloth robe, a few pairs of jeans and some thick cotton socks and the horses go up . We haven't gone the ATU route yet . . but I imagine it's coming . I think 1 ATU is 14 . 7 lbs/psi . . right? PSI is the only factor we use . . and it's just easier for me at my age to not convert now . Lbs/PSI I also think is the correct nomenclature . . it's "pounds-per-square-inch" with the "lbs" for "pounds", but then again I am closer to England than youse guys anyway .	SurferJoe46 (51)
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