movable Car Washing - "What Psi and Gpm Do I Need For Optimum Efficiency?" He Asked

If you want to run an effective mobile car wash business, there a few things you need to know. Not long ago I was asked a very good query by just such a car cleaning specialist. He wanted to know what pressure rating, Psi or pounds per quadrate inch and what Gpm (Gallons per Minute) would be the most effective in his operations? Let's take a look at this because this is a very prominent question.

We all the time chose the 4.5 gallons per minute, 10-12 hp skid units, later we went to 5 Gpm and 17 Hp, then many franchisees as they bought supplementary units for more market work went 3500 Psi and 22-25 Hp.

3000 Psi

You see, if you are doing absolutely big jobs you going to need more water, giving you more cleaning units, and they also control hydro-twister type attachments much better. For those you need 6 to 7 gallons per wee to absolutely run optimum, and you can clean concrete about as fast as you can walk, like mowing a lawn with a expert grade lawn mower with sharp blades and state-of-the-art technology.

Nevertheless, when it comes to ageement cleaning, it is all the time an issue with water supply. If you have a big flat bed trailer with a 500 - 1000 gallon tank you can get away with using more gallons per minute. We had our units set up where we could take the 4.5 gallons per minute, adjust the theory to put out only two or 3 gallons per wee under 1500 Psi for clean cars, and then ramping it up to 3000 Psi at 4.5 gallons per wee when we are cleaning trucks.

Some of our units had dual hoses and dual wands for cleaning lots of cars on car lots, in this case we would bypass the coils, and divide the water, that way each of the wands/guns got 2.25 gallons per minute. But to voice the right pressure you have to swap out the tips at the end of the guns they don't let as much water out.

And after a while it gets fairly complicated, so you need an operator that knows what they are doing, and you can't lose the tips, which does happen with quick disconnects malfunctioning, bad O'rings (remember the Space Shuttle) sometimes they pop off, especially over time as the quick disconnect brass fittings fail, and even the stainless steel quick disconnects don't last forever.

These are certainly wear-able parts, have spares with you in your glove box or tool box, and o'rings, extra-tips, or "you'll be sorry later" guaranteed! No one likes soggy socks and shoes when pressure washing - be prepared, be Usmc tough.

So, in summary;

If you're going to wash trucks go with 4.5 gallons per wee and 3000 Psi with attended 12 hp skid unit on a hot-water pressure washer.

If you are going to just clean cars, go with a 5.0 hp Honda motor with a normal pump and do your work at in the middle of 1500 and 2200 Psi - and look for water volumes of 2.4 gallons per minute, 23 gallons per minute.

movable Car Washing - "What Psi and Gpm Do I Need For Optimum Efficiency?" He Asked

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