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Mixing sink
Herbicide holding tank 9.2 Public Health Significance of Cross-Connections 273
Potable town water
Recommended installation of
backflow preventer Figure 9.5 Paraquat in the water system.
Hose used for propane
tank purging cross- Fire
connected to private fire
hydrant
Recommended
backflow preventer
installation
Water main
pressure 65 psi
Figure 9.6 Propane gas in the
water mains. Conversion factor:
Explosion 1psi = 6.94 kPa.
