tank suction

J

JFife

Member
hey guys,


I have been reading up on this, and before i make my move i want to make sure i am doing this correct.

I am setting up a boxvan with 2 PW's, both 4@3000 belt driven, one TS1511, and one a Giant pump. Just got it hooked up today, and they are not drawing water from the tank properly. Rowlett suggested i get a Flowtech pump at HD, but after reading up a little it seems like i just need to raise the tank up 2ft off the floor of the truck and gravity will do the rest. What do you think?? I'd sure appreciate any advise as soon as possible, unfortunately i have to work tomorrow and need to solve this problem by noon.

Thanks fellas,

jon fife
 
They should draw even tho the supply outlet is below the pump a little,mine is a good 8 in. below my pump and it will suck the tank dry.By running two pumps your supply line should be 1,1 1/2 or 2 in. hose as to not strave each pump which will happen if using to small of a supply line.
 
The type and size of the hose is real important. ou must have suction type hose that does not flatten out with suction. Braided poly hose or pvc pipe works good The grey pipe is better than the white. It should be at least 3/4 inch inside diameter whwather it is hose or pipe.
 
In general belt-drive pumps have 6" of vacuum which will lift water at least 6 feet. Direct-drive pumps have 1/2" or less of vacuum so they will only lift water 1' maximum.

A 1/2" supply hose has a capacity of 8 gpm so you need a supply of at least 3/4" reinforced hose to ensure adequate supply to both pressure washers. Elevating the tank above the inlet of the pumps will give you a gravity head that will give a flooded state to the pump head and prevent any possibility of cavitation. Ensure the mounting is more than adequate for the dynamic weight of an unbaffled tank or lower the pressure washers.

Hope this helps? Cheers.
 
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