Tank Cleaning Nozzles
Tank cleaning nozzles generally have small internal passages and outlet orifices. Therefore, it is advisable to install a filter in the inlet line to avoid clogging due to particulate in the feed line.
Selection of proper tank cleaning nozzle
One of the questions we deal with regularly when discussing tank washer selections with customers is, “How much liquid flow is required to clean a tank?” That’s not an easy question and in the same league with “How many horsepower does a car need?” As in many situations, the answer is, it depends. While you will ultimately need to be the judge for your specific applications, the following guidelines should be helpful.
How big is the tank?
You know the volume, but think in terms of interior surface area and distance between the walls. If you compare a spherical tank and a tall “silo” tank of the same capacity, you could come up with substantially different answers. Begin your analysis by calculating the interior surface area (it doesn’t have to be very precise for elliptical tank heads, etc.) and the longest distance that the nozzle will have to spray from its mounting position.
What is the nature of the cleaning function?
Think about what you’re trying to wash out of the tank. Is it simply a liquid residue that has to be rinsed away? Is there solid material that has to be knocked off the walls? Are there mineral deposits? Some residues are more difficult than others.
What is the chemical action of the cleaning solution?
Water may be fine for washing out molasses, but it probably won’t do the job for something oily. Alkali cleaners will help with many products, but won’t help with mineral deposits. The cleaner should soften, dissolve or otherwise break down the soil in the tank to move the process along.
How congested is the interior?
A mixer with large internal blades and paddles will require a much different approach than a clear space.
Factors in nozzle installation
In defining your tank cleaning nozzle installation, be sure to observe the following four parameters:
1) Rinsing effect – a function of flow rate
Determine the required liquid flow rate by trial and error as a function of the applied pressure and the liquid’s ability to clean the dirt from the tank’s surface.
- As the nozzle head revolves, it should cover the entire area to be cleaned with an effective amount of cleaning liquid.
- In comparison with rotational cleaners, static spray balls require roughly twice as much liquid flow.
- Remember: Your drain must be able to handle whatever you’re putting in the tank.
2) Force of impact – helps strip off crusty dirt
The force of impact depends upon:
- Adherence to the optimal operating pressure range for the type of nozzle in use;
- The right cleaning radius and volumetric flow for the size of tank in question;
- Concentration of the spray jets on the most badly soiled areas, e.g., 270° up or down.
3) Proper positioning – for optimal targeting
- In case of internal obstacles, either use several nozzles or place the nozzle at different locations.
- Slowly rotate any mixing blades or the like during the cleaning process.
- See next page for nozzle positioning assistance.
4) Application suitability – ensures safe operation
- When using any type of plastic spray nozzle, there exists the potential for static charge buildup which can create the possibility for a potential problem in some applications.
- For all tank applications involving combustible gas, flammable liquids, and/or other potentially explosive materials, please consult with technical person prior to purchasing tank cleaning nozzles.
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