Boiler Cleaner


The Kränzle boiler cleaning system was developed with the assistance of experienced operators in the boiler cleaning industry.  It allows one–man operation and guarantees a very high grade of cleanliness without doing any damage to the boiler tubes.

Due to the nature of the fuels and the decreasing quality of coal, a coal fired boiler will require more regular cleaning (approximately 2000 hours of operating or less) to maintain a reasonable thermal efficiency of the heat transfer surfaces.

Please Note: Soot blowers do not clean the fireside of the boiler.  They only remove scale and soot from the second pass tube plate and tube ends.

Maintaining a scheduled cleaning program for boilers is essential to reduce fuel costs, to prevent blockage of the second pass tubes, which will cause overheating of the stoker and low steam pressures.

Because soot has five times the insulating value of asbestos, the heat transfer loss in a dirty boiler rises dramatically as the layer of soot builds up.

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The effect of Soot and Scale

Soot and Scale Build Up   Heat Loss          Increased Fuel Costs

0.8mm                              12%                            2.5%

1.6mm                              24%                            4.5%

3.2mm                              47%                            8.5%

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Equipment required

  • Kränzle Quadro 800 TST cold water high pressure cleaner supplying water at 13,6L/minute at 250 bar with 10m hose, gun, lance and Turbokiller lance.
  • Kränzle Boiler cleaning kit with Hydro-head and pre-rinsing nozzles
  • Foot valve connected to the machine allows hands free activation of the unit.
  • Additional high pressure hose to feed the pre-rinsing nozzles and hydro-head into the boiler tubes.


  • One man operation without physical strain (see photographs)
  • No noise
  • No dust, thus eliminating a huge health hazard
  • Reduction of cleaning time by up to 70%
  • Low purchase price versus return
  • Low Maintenance costs
  • The cleaning kit also provides the customer with our rotating nozzle lance which is very effective in cleaning flues, back and front tube plates.

Steps in cleaning boiler tubes

  • Prepare for cleaning by ensuring that all electrical gear in the path of the water is covered. Place plastic across the width of the boiler so that the dirty water does not splash on the walls.
  • Ensure that the oil level of the pump is correct.
  • Before connecting the water hose to the pump ensure that it is clean water and the water pressure is sufficient and open water flow to pump.
  • Connect the Starlet Gun and Turbokiller rotating nozzle to the high pressure cleaner, hold the trigger in until all the air has been removed and the water is running freely.
  • Clean the front and rear tube plates and then remove the Starlet Gun and Turbokiller.
  • Connect the high pressure cleaner hose to the foot valve switch and those from the foot switch to the tool being used.
  • Connect the pre-rinsing nozzle to suit the correct diameter of the boiler tube.
  • Measure off the hose to the length of tube and mark with stopper – this is where the hose must stop so as not to go out the other end.
  • Insert the pre-rinsing nozzle into the boiler tube and activate the machine by depressing the foot switch.
  • Feed the hose and nozzle along the length of the tube.
  • The loose scale and soot will be expelled from the tube by the water flow coming out of the nozzles. Once the water is clear move on to the next tube.
  • Once the section has been cleaned with the pre-rinsing nozzle, remove and connect the Hydro-head with suitable sized cutters fitted.
  • Repeat the process with the Hydro-head to remove the remaining scale build-up.
  • This process is followed until all the boiler tubes are cleaned.
  • Cover the stoker matt with plastic. Re-connect Starlet Gun and Turbokiller clean the flue, second pass tube plate and re-clean front and rear tube plates.
  • The Kränzle Quadro together with the sandblasting kit is the suitable combination to prepare the boiler for the 3-year statutory inspection.  The sandblasting process is a dust-free application that uses the water under pressure to propel the sand.
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