Abstract: The invention relates to a method for internal cleaning of pipes or tubes by inserting and propelling a projectile into and through respectively said pipe or tube by means of pressurized fluid, whereby the projectiles are fed one by one, in a direction generally transversal in relation to a firing direction, through an open side (16) of a housing (8) to a chamber (15) of the housing (8), whereupon a pressurized fluid source (50) is brought into communication with the chamber for discharging the projectile from the chamber (15) and for inserting the same into said tube or pipe through a nozzle, whereby the invention is characterized in that when a projectile has been fed into the chamber (15) the housing (8) is pivoted from a loading position to a firing position for bringing its open side (16) into alignment with the nozzle and thereby to coincide with the firing direction.