Effectively Clean Tanks and Reactors

Choose the right equipment to avoid costly contamination problems.

By Anthony Wood, Spraying Systems Co.

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Six steps may provide significant benefits:

1. Reduce use of heated water. Hot water is costly but frequently is viewed as a necessary evil to remove some residues. However, increasing impact often can often get the job done and cut or eliminate the need for hot water.

2. Minimize "striping." Vessel cleaners provide 360° coverage. However, the solid stream sprays don't overlap as they rotate, so there's a small distance between the sprays and thus a so-called striping effect. The greater the distance the nozzles are from the vessel walls, the greater the distance between the sprays. The best way to minimize striping is to use a four-nozzle hub rather than the standard two-nozzle hub. This will cut striping in half.

3. Change spray head position. Use an adjustable ball fitting to clean vessels in sections. Clean the top half of the vessel, then lower the device and clean the bottom half of the vessel or change the angle to clean difficult locations.

4. Decrease the number of cleaning cycles. Simple adjustments to pressure and flow may enable a reduction in the number of cycles needed for thorough cleaning. To increase impact and cleaning efficiency it's far more effective to increase flow than pressure. Doubling flow rate boosts impact as much as 100%; doubling pressure only provides 40% more impact.

5. Recirculate. Do you spray and drain? Check into recycling your cleaning solution if you aren't using hazardous materials and your water is debris free.

6. Activate cleaning with the flip of a switch. Hard piping your vessel cleaner in place can save time and reduce labor costs. Consider permanently installing the device if the material or its temperature won't damage the cleaning equipment.


ANTHONY WOOD is a tank cleaning specialist at Spraying Systems Co., Wheaton, Ill. E-mail him at Anthony.wood@spray.com.


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