Functional sequence

The Shock Pulse Generator was developed in 2009 and since then has proven its outstanding performance. As with manual explosion cleaning processes, the Shock Pulse Generator cleans the boiler by shock waves. The shock waves are created by fast combustion of a mixture of burnable gas (Natural Gas or Methane) and air. Contrary to manual processes, the combustion is carried out automatically and outside of the boiler, in a pressure resistant device. The resulting supersonic shock wave is introduced into the boiler by means of a valve and a discharge nozzle. The combustion gas, the boiler tubes and walls are put into a short oscillation, so that deposits, i.e. slag and fly ash, are cleaned off.

Function and Cleaning Effect

The following steps are performed during one cycle:

  • Filling of combustion chamber with methane / natural gas and air
  • Mixing of gases in combustion chamber
  • Ignition by glow plug
  • Opening of piston, releasing discharge valve
  • Injection of shock pulse into the boiler
  • Short shock pulse cleans heating surfaces, removing slag and fly ash
  • Mild boiler cleaning without damage to boiler tubes


Shock Pulse Generators are manufactured in Switzerland, from special high pressure and high temperature resistant stainless-steel qualities and other high quality components. Shock Pulse Generators are CE-certified as pressure equipments of Category III (SPGr10) resp. Category IV (SPGr16). The Shock Pulse Generator SPGr is available as two different types, SPGr10 and SPGr16. The technical information of both types can be found in the following table

Shock Pulse Generator SPGr

Technical data

Technical data SPGr