Sprayers

 
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Old 03-11-2009, 12:50 AM   #21
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Re: Sprayers


I ended up with the 1500, just used it for the first time today with the fine finish kit. Shot a 2 car garage. Pretty sweet machine, I found you can shoot a wall or two and knock it down pretty much right away with out the walls being primed. Just don't let it sit to long or those seams will suck the moisture right up and produce an uneven finish. The customer was so intriged he took over and shot half the thing. He knocked down a little too. And it still turned out pretty darn good. I'm doing a straight trade for a camper, so he wasn't to worried about it to begin with.

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Old 03-30-2009, 07:32 PM   #22
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Re: Sprayers


If anybody is interested my dad has retired and we have an old tankless compressor that he sprayed ceilings with for years, as far as I know it works good. I plugged it in and it ran like always. Don't know what it would be worth. It has a 1 1/2 hp baldor motor, the frame has two larger wheels and two smaller swivel wheels. It is located in Denver CO. rcracerrick@yahoo.com
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Old 04-26-2009, 01:18 PM   #23
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Re: Sprayers


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Originally Posted by mollie27 View Post
Surging material flow is the biggest problem. Hose diameter and length along with material viscosity are the primary variables. By design the pump has a pressure relief spot when pressurizing from one side to the other. I can elaborate but will have to think about that a bit. Having a long, large diameter hose helps even out the flow. Or Flo, however surging may still occur. Stator tube pumps (spray rig, Kodiak) give you a constant flow, regardless of hose size and length. I have heard good things about the RTX 1500 peristaltic pump. Another thing that helps even flow is th use of the fan spray tip extension made by Graco or Benron. The fine thread one fit right on my preying mantis hopper pistol. Being able to adjust the mud thickness in the barrel and using a dedicated compressor for the pump make it more user friendly that the manufactured units.
Dredging up an old thread:

The large diameter hose should have especially helped with keeping the pressure up that came out of the end of a long hose. But could much of the surging have been because of the number of diaphragms in the pump, and their configuration?

I built a good sized tree sprayer unit once, using a diaphragm pump. I thought it might make more sense than the tree sprayer piston pumps I was familiar with. Some engineers from FMC said the pump wouldn't work for what I wanted, due to what they call 'slippage' - not positive enough displacement in the diaphragms for the material volume and pressures I wanted. I looked at the pump's specs and decided the slippage was too minimal for it to not work well. It worked fine. But maybe for you, the slippage created was too much, because of eg. material thickness?

I went with a pump that had 4 diaphragms, configured in a circle. I thought it might give smooth operating/delivery, which it did. It was smoother than the piston pumps I was familiar with - 3 piston pumps, which in turn were smoother than the 2 piston pumps. Lots of pulsating in the handle with the 2 piston pumps.

It also helped that I 'over-sized' the pump - never needing more than ~80% of what the pump could deliver. It helped maintain a constant pressure, which helped give a constant feed. Maybe a master of the obvious statement, but I've seen people underbuild systems.

Last edited by JustMe; 04-26-2009 at 01:21 PM. Reason: clarification
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