Replies

1. 
   BarryO | Oct 16, 2006 07:44am | #1

   'depends on the CFM of the tool and the diameter of the hose.  Contractors run nail guns on this length all the time, but their CFM is alot lower.  harbor Freight has 1/2" hose in 50' lengths; maybe that's big enough in diameter(?)

1. 
   mapleman | Oct 16, 2006 09:07am | #2

   Hi Barry,

   I believe my hose is 3/8" diameter. Before I invested in 1/2" hose, I think i would run a dedicated line underground with galvanized pipe (copper pipe seems to have gone through the roof lately). However, even this would run over $100 for the pipe. I have plenty of 3/8" hose to span the distance, just wondering in advance what if any problems there may be.

   Lee

1. 
   daryl | Oct 16, 2006 05:01pm | #3

   I'm no expert, but I do recall reading somewhere that you can run almost as much hose as you want; it's considered an extra tank. It was part of a paragraph saying use extra air hose, and never run an extension cord.

2. 
   BarryO | Oct 16, 2006 11:42pm | #8

   I have plenty of 3/8" hose to span the distance...

   You could run two 3/8" in parallel, if you have alot of hose.  That would have more internal cross section than a 1/2".

1. 
   mapleman | Oct 17, 2006 04:16am | #9

   Hey Gang,

   Thanks for all of the great ideas. I'm going to give it a shot, worst case scenario, I will have to lug the compressor closer. I'm only spraying at 45 psi, so even if I get some pressure drop at the gun I am assuming I could turn up the regulator some?

   Lee

2. 
   jako17 | Oct 16, 2006 06:58pm | #4

   You will get a drop in psi with small diameter ,long runs of hose and large cfm.It works the same as thin ext cords and large amperage saws etc.More significant may be the the tendency for condensation in the line. You can fit a pressure guage and regulatir on the gun to combat and see the effect.This is how body shops maintain critical pressures at the gun 

1. 
   MikeHennessy | Oct 16, 2006 10:14pm | #6

   More importantly, you get a drop in cfm. You can make up for it a bit by using a "pig" -- a relativel inexpensive compressed air tank near the working end of the line.

   Mike HennessyPittsburgh, PA

1. 
   Mumda | Oct 16, 2006 11:05pm | #7

   That's a great idea!

3. 
   Mumda | Oct 16, 2006 08:30pm | #5

   Maybe you can buy one of those $35 ten gallon air tanks and add it to the hose near the spray gun? At least you'd have something useful for your investment after the job is done.

4. 
   Troy | Oct 17, 2006 05:59am | #10

   This is strictly second hand but I seem to remember that you need to be extra careful with moisture when you have longer runs of hose. You might consider adding a moisture filter close to the end of the hose. I talked to a sales rep for moisture filters for the guys who paint and sand blast on the Golden gate bridge and they have to becareful with the very long runs of compressed air pipe and hoses for the equipment they are using. Of course they are going with much longer lengths of pipe and hose but they are not spraying laquer on fine hard woods either. I am sure you will be fine just remember that when compressed air cools the moisture condenses out of the air.

   Troy

1. 
   mapleman | Oct 17, 2006 08:30am | #11

   Hi Troy,

   Thanks for the advice. You are the second poster to mention condensation in the line, which I never really gave any thought to. I believe I have a spare regulator/water trap laying around. I think I will turn the pressure all the way up at the compressor, then regulate it closer to the gun with my spare.

   Lee

5. 
   JeffHeath | Oct 17, 2006 11:23pm | #12

   Lee

   I just finished painting a trailer outside with the same setup, with 100 feet of 3/8" rubber hose with absolutely no problems at all.  I didn't want to get my good hvlp setup full of paint, cause I use it to spray furniture, so I bought one of those inexpensive setups, and it worked great.

   Jeff

6. 
   art | Oct 17, 2006 11:36pm | #13

   I regularly spray with 100 ft of 3/8 hose plus about 25 ft of pipe using a conventioal (Binks) gun with no problems. Set the pressure at the compressor to a level that gives you good results.   Art

1. 
   user-202342 | Oct 18, 2006 03:50am | #14

   there is a 5 psi drop with 3/8 hose for ever 50 foot.

1. 
   dgreen | Oct 18, 2006 04:17am | #15

   At what flow rate? How did you arrive at this figure? The ultimate result of shielding men from the effects of folly is to fill the world with fools. -- Herbert Spencer (1891)

1. 
   user-202342 | Oct 18, 2006 05:09am | #16

   by putting a pressure gauge at each end .

1. 
   dgreen | Oct 18, 2006 05:49am | #17

   At what flow rate? At zero flow the guages will read the same. At anything other than zero flow the drop will depend on the cfm. The ultimate result of shielding men from the effects of folly is to fill the world with fools. -- Herbert Spencer (1891)

2. 
   tinkerer2 | Oct 18, 2006 05:54am | #19

   oops, I missed your reply, Sorry.

3. 
   tinkerer2 | Oct 18, 2006 05:52am | #18

   but you still need to know the flow rate.  Obviously if there is no flow the difference is  zero.  To check your accuracy you need to switch the pressure gauges being sure the flow is the same.