Abstract: A filling pistol for the filling under pressure of an object essentially with nitrogen. The filling pistol has a housing with an inlet opening connectable to an air source, such as an air compressor, to supply air to the pistol. A separation device is incorporated downstream of and connected to the inlet opening to obtain essentially nitrogen-rich gas. An outlet opening is connected to the separation device and is connectable to the object to supply nitrogen-rich air from the filling pistol to the object. The separation device is provided between the air inlet and the nitrogen outlet of an exchangeable separation cartridge. An operating element sets the filling pistol to an operating condition to fill the object with nitrogen-rich air.

Abstract: A filling pistol for the filling under pressure of an object essentially with nitrogen. The filling pistol has a housing with an inlet opening connectable to an air source, such as an air compressor, to supply air to the pistol. A separation device is incorporated downstream of and connected to the inlet opening to obtain essentially nitrogen-rich gas. An outlet opening is connected to the separation device and is connectable to the object to supply nitrogen-rich air from the filling pistol to the object. The separation device is provided between the air inlet and the nitrogen outlet of an exchangeable separation cartridge. An operating element sets the filling pistol to an operating condition to fill the object with nitrogen-rich air.

Abstract: An iron roughneck has a pair of upper jaws carrying pipe gripping dies for gripping tool joints. The jaws have recesses formed on each side of the pipe gripping dies to receive spinning rollers. By positioning the spinning rollers in the upper jaws at the same level as pipe gripping dies, the spinning rollers are able to engage the pipe closer to the lower jaws and thus can act on the tool joint rather than on the pipe stem.