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Post Info TOPIC: What's the difference?


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This is probably a question for Lori,but I'm sure there'll be someone else that would know too.What's the difference between a demand pump and a bypass pump?Which is the better of the two for cleaning roofs as that'll be all I'll be cleaning?Thanks

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Oh yeah...I see that the delavan pumps have an 1/2" inlet/outlet,right?Do ya'll just cut and connect the 1/2" to the 5/8" hose?I know that the 5/8" is better,right?Thanks again

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deleted due to being wrong. see below for correct answers!


-- Edited by Midtown on Tuesday 16th of March 2010 04:25:43 PM

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 By-pass pumps route the liquid back into the supply tank when the application line is shut off. It eliminates the need for a demand switch because its flowing constantly. A by-pass valve is needed to operate this way.I don't use electric pumps but I've asked in the past why people use the demand switch rather than the by-pass.

Jeff

-- Edited by Raystown Roof Cleaning Central PA 1-800-236-0322 on Monday 15th of March 2010 01:52:12 PM

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If you're using an electric pump (which we do, fatboy), it doesnt really make sense to have a bypass. Also, I've heard that if you do use a bypass with an electric pump, it can burn up the motor if it runs bypassing to long. I have not tested this, but what would be the point?

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Does anyone have actual experience with a by-pass electric system?

Jeff

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Raystown Roof Cleaning
Central, Pa

(814) 644-1396 or 1-800-236-0322

Roof Cleaning Central Pennsylvania

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I appreciate it.I've only seen one site that had the two.I saw it this morning and thought I'd ask before purchasing one

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I have a delavan on demand pump that I use for roof cleaning. On demand basically means that when I open the ball valve the pump starts pumping and will shut off when I close the valve. So the pump only runs when the ball valve is open.

I have a 12 volt bypass pump that I use in by biodiesel operation. The pump has an internal bypass. What that means is when I turn the pump on it starts pumping regardless of the nozzle being opened or closed. If the nozzle is closed the biodiesel will circulate within the pump. As soon as I open the nozzle the pump will transfer the biodiesel out of the pump through the hose into my truck tank. The pump runs continously until I shut it off with the pump switch.

12 volt electric pumps usually have a short duty cycle. If you are using a 12 volt pump for roof cleaning I would use an on demand pump. If you use a bypass pump you will probably exceed the duty cycle and run the risk of burning up the pump.

Charles

-- Edited by cweman on Wednesday 17th of March 2010 11:00:37 AM

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Charles,

Great Info i always Knew we should go with the Demand but never knew why!

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on demand cool! I'm buying tomorow!

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Thank you Charles!And,I gotta say,Oorah to you for using biodiesel!!!!I'm wanting to get a diesel van for my business and I'd LOVE to run it off of old fastfood grease.....Hey,to come and think about it now,they'll be smalling McDeez fries instead of TSp...lol.....seriously,I think that's awesome!

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