Ferrule--type fitting for sealing an electrical conduit in a well head barrier

A ferrule-type fitting for forming a fluid-tight seal between an insulated electrical conductor extending from outside a well to a wellhead barrier and a rigid tube that projects outside the wellhead barrier, the rigid tube surrounding the electrical conductor and, extending through the wellhead barrier for routing of the electrical conductor, said ferrule-type fitting comprising:

• a tubular body fitting with an elongated opening sized and shaped to fit around the rigid tube, said opening including a conical counter bored section adjacent to one end for forming a gap between said body fitting and the rigid tube, said body fitting including an outer threaded surface on said one end;
• a ring shaped ferrule bushing formed of a material softer than the material of the rigid tube, which has the tendency of returning to its original shape after being deformed, said ferrule bushing being sized and shaped to fit around and directly contact the rigid tube and interface said conical counter bored section with said gap;
• a nut fitting including threaded inner surface for engaging the outer threaded surface of said body fitting and a shoulder for engaging said ferrule bushing, wherein said shoulder engaging said ferrule bushing so that said ferrule bushing is deformed to engage and crimp the rigid tube for providing a fluid-tight seal between the inner surface of the rigid tube and the insulated electrical conductor after said nut fitting is tightened onto said body fitting, and wherein said ferrule bushing is not hard enough to permanently engage the rigid tube, but returns to its original shape so that it can be removed from the crimped rigid tube when said nut fitting is loosened and removed from said body fitting.