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Thanks Chris, I am pulling from the bottom of the tank, so that could very well be what happened to mine. I am going to set up this year to pull from the top of the tank.


Thanks again,

Jeff

How do you pull from the top of the tank? What happens when the solution level in the tank drops down?

You could use a pvc tube to go into the tank and cut 1/2 of the side open about an inch above the bottom and plug the bottom of the tube so it pulls from an inch above the bottom of the tank so less trash gets into the suction line or use a large strainer that will hold up to the chems.

I wonder if it would be possible to find a strainer that would hold up to the chems that we could put the TSP into and then place it in the tank. A 'tea bag' effect I suppose. Get the effect of the TSP without the solid particles building up, just remove the bag when its time for new TSP. Even pulling from the top it would help keep the tank clean because it seems that stuff NEVER goes away. I dont know how feesable it is but I suppose I will start looking into it. Sorry for the shame-less roof cleaning in Cleveland and Columbus Ohio link. I couldnt think of a creative way to put it in there.

-- Edited by mmcgue at 17:34, 2009-02-02

Raystown Roof Cleaning wrote:

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Hey Chris, or anyone else using the air powered diaphragm pumps. I have a Yamada 15 NDP. Bought in the Spring of last year and used it all Summer with no real issues,...EXCEPT one. First off it is being run at 11 cfm and 90 psi. Pushing through 200' of 5/8" hose. Now and then it will just stop pumping,(especially if the flow of fluid is off for very long) ...remedy is to hit the little button on the side of the pump. It seems to be an air problem of sorts because it will also restart pumping by simply shutting the air supply on/off. Kinda' irritating. I am NOT running the recommended pulsation dampener, not sure if it holds some sort of back pressure or what. Just wondering if anyone else has had this issue.


Jeff

-- Edited by Raystown Pressure Washing at 06:31, 2009-01-11

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Just want to refresh this topic, in case others experience the same problem. I think I found the problem, there is a valve called a shuttle valve that needs to be installed just before the pump to properly direct the air so the pump will not stall when you stop and start the flow of fluid. Haven't got it yet, but does anyone here have any experience with these valves on a pneumatic diaphragm pump? There are three ports, and it's like a basic tee fitting with a ball bearing inside. Not sure yet exactly how it gets plumbed inconsidering the third port. The Yamada NDP series is supposed to have a no-stall valve but from what I've found out they're not fool proof, and this shutle valve is the remedy. I guess it basically shuts the air on and off with the ball bearing sliding from side to side inside the valve. Which does explain why the pump would always restart by just turning the air on/off manually. Here is what it looks like:

Shuttle Valve Example

Jeff

 

-- Edited by Raystown Roof Cleaning at 05:23, 2009-01-27

-- Edited by Raystown Roof Cleaning at 09:56, 2009-01-27

Raystown Roof Cleaning wrote:

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Raystown Roof Cleaning wrote:

---

Hey Chris, or anyone else using the air powered diaphragm pumps. I have a Yamada 15 NDP. Bought in the Spring of last year and used it all Summer with no real issues,...EXCEPT one. First off it is being run at 11 cfm and 90 psi. Pushing through 200' of 5/8" hose. Now and then it will just stop pumping,(especially if the flow of fluid is off for very long) ...remedy is to hit the little button on the side of the pump. It seems to be an air problem of sorts because it will also restart pumping by simply shutting the air supply on/off. Kinda' irritating. I am NOT running the recommended pulsation dampener, not sure if it holds some sort of back pressure or what. Just wondering if anyone else has had this issue.


Jeff

-- Edited by Raystown Pressure Washing at 06:31, 2009-01-11

---

Just want to refresh this topic, in case others experience the same problem. I think I found the problem, there is a valve called a shuttle valve that needs to be installed just before the pump to properly direct the air so the pump will not stall when you stop and start the flow of fluid. Haven't got it yet, but does anyone here have any experience with these valves on a pneumatic diaphragm pump? There are three ports, and it's like a basic tee fitting with a ball bearing inside. Not sure yet exactly how it gets plumbed inconsidering the third port. The Yamada NDP series is supposed to have a no-stall valve but from what I've found out they're not fool proof, and this shutle valve is the remedy. I guess it basically shuts the air on and off with the ball bearing sliding from side to side inside the valve. Which does explain why the pump would always restart by just turning the air on/off manually. Here is what it looks like:

Shuttle Valve Example

Jeff

 

-- Edited by Raystown Roof Cleaning at 05:23, 2009-01-27

-- Edited by Raystown Roof Cleaning at 09:56, 2009-01-27

 

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Jeff, we just live with it.
It don't happen all that much, and we simply push the button, or turn the air supply on and off when it does.
I guess it can be irritating if cleaning roofs alone ?
But our ground men are familiar with this quirk, and solve the problem quickly the few times it does happen.
We do not use a pulsation damper either.
300 feet of 5/8 hose dampens the pulsations quite nicely.

 

Raystown Roof Cleaning wrote:

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I hear ya' about the dampener Chris, that's the way I figured it as well. Yea, I yell at my ground man to but I still don't like it. Some of the guys have mentioned oiling the air, think I will try that. The Cajun Cleaning guys hit my issue right on with their description of a stuck shuttle valve in the pump. Jeff

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Yamada insists we should have an air filter inline before the roof cleaning pump, but we don't.
We do bleed our air compressors every day of water.
Let us know about your experiences IF you do go to the valve arrangement ?
Our pumps do it sometimes, but not enough for us to worry about.
The POLY pumps seemed to stall more then the Kynar roof cleaning pumps we use.