Requirements:Gravel projection apparatus from company ERICHSEN (4 passage Saint-Antoine, Rueil Malmaison),reference VDA 508. This appliance has to be modified in order to be able to fit to tested part withcorrect angle and position.• Gravel is made of cast iron, ROCKWELL hardness 61 to 65 with sharp edge and an averagediameter of 4 to 5 mm.• Open 10mm the gravel opening• Feed the apparatus with 500g +/- 1g of gravel• Turn on the appliance• The time between the ejection of the first and the last gravel must be 10s +/- 1s. Adjustment to bedone through feeding speed setting of the gravel.Testing Procedure for the Condensers• Base settings:o Pressure: 1 baro Gravel weight: 500go Distance: 349 mm