Static and Rotational
Static - spray balls deliver a solid stream of spray and do not provide full coverage for cleaning. Rotating nozzles, on the other hand, spray the entire surface of the tank and provide more penetration for removing stubborn soils. There are three different types of rotational spray nozzles:
Free spinning - This cleaning device is driven by the pressure of the water. The head of the nozzle rotates faster as the pressure increases. These nozzles clean best at low pressures of 40 to 60 psi and are perfect for small to medium size tanks.
Controlled rotation – The rotation of this nozzle is controlled by an internal turbine and it contains no gears. The slower rotation provides more impact and better spray coverage for removing very difficult soils. These nozzles can also be run at higher pressures, which will not affect the speed of the rotation.
Gear-controlled – These types of nozzles provide the highest impact and are excellent for cleaning large tanks. The nozzle rotates on two axis points, which allows it to sweep the entire circumference of the tank interior. This assures every spot will be cleaned.