Chemical injector and ratios - Supplies & Equipment

So I tested my chemical injector and pump today to check my house mix ratio. I went from a 4gpm pump to 5.5 gear drive on a gx390 using a 2.1 hi-draw 3-5gpm injector with 50/50 mix of 12.5%. After washing a few houses with the new pump I noticed the mix not working the way it used to…had to soap a second time a few times even on siding with light mildew and algae.

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So this is what I came up with in my test:

200 feet of hose. 5.5gpm GP pump/gx390. 2.1 hi-draw 3-5gpm injector. One gallon jug marked at 1 cup intervals up to 16 cups. M5DS tip. I pulled the trigger for 30 seconds into a 5 gallon bucket with my injector line in the one gallon “soap” jug. After 30 seconds I had 3.3 gallons and pulled 3.5 cups of “soap”

3.5x2=7 cups of soap drawn in 1 minute
3.3 gallons in bucketx2=6.6gpm=105.6cups in 1 minute minus 7 cups of soap=98.6 cups

98.6 / 7 = 14 to 1 injector ratio…if I was using a 50/50 mix 12.5/2=6.25 / 14 = .45% hitting the wall which explains why it wasn’t working very well.

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Would a 20% 5-8 injector work better for my set up? This pump is putting out 6.6gpm…I tested it twice…same results. If I drew straight 12.5 then .89% would hit the wall which would be better. Just looking for some thoughts here. I think I tested everything correctly.

If you’ve ever talked to a pump technician or sales engineer about ordering the right pump for your application, you know they typically ask many questions. That’s because they see the pump not only as a device for moving fluids but as they main component in a network of equipment and product attributes that all have to work together to maintain flow throughout the processing system.

As you can imagine, using the wrong pump for your application can lead to processing slowdowns or shutdowns. Just as costly, the wrong pump can result in inconsistencies in product or the wrong product altogether. That’s why pump representatives ask for information about your application.

Pump experts at CSI consider five key factors for pump size in sanitary applications in food, dairy, beverage, and pharmaceutical applications. In this article, we explain why the factors are so important.

While even more factors must be considered, these are the top five:

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1. Differential Pressure
2. Fluid Temperature
3. Viscosity
4. Flow Rate
5. Density