Tips of nails never get coated as they are away from the Pipe.Free to expand as well as vibrate at one end. Increasing rapping efficiency.Design can be accommodated in any framemake.The sharp nails possess higher corona generating ability as compared to any other emitting electrode geometry.The desired corona level can be achieved by welding desired amount of nails on the pipe.The desired corona field can be produced by welding nails of desired lengths.The desired field strength can be achieved by welding the nails at a par-ticular angleCorona generates at lower voltage which increases the level of useful power being fed to the ESP.