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US 2003/0080552 A1Published application
Multilayer tube with butt weldable end and welding method for a multilayer tube
AssigneeNupi S.p.A.
InventorMassimo Genoni
Life of this patent
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AssigneeNupi S.p.A.
InventorMassimo Genoni
Estimating the term…
A weldable plastic tube (10) has at least one end designed to be butt welded and designed for the conveyance of a fluid producing a drop in mechanical resistance of said weldable plastic. The tube comprises an internal layer (12) for protection of the plastic of the tube from contact with the fluid conveyed and adjoining said welding end has a terminal section permanently covered with an external reinforcing sleeve (13) also of weldable plastic to participate in the butt welding of the tube. The sleeve has a thickness such as to make the mechanical resistance of the tube section nearest the welded end at least equal to the mechanical resistance of the tube not in contact with the fluid when in contact with the fluid in the welding zone which will be without the internal protective layer.
Weldable plastic tube having at least one end designed to be butt welded and designed for the conveyance of a fluid producing a drop in mechanical resistance of said weldable plastic and comprising an internal layer for protection of the plastic of the tube from contact with the fluid conveyed and with a terminal section of the tube adjoining said welding end permanently covered with an external reinforcing sleeve also of weldable plastic to participate in the butt welding of the tube with the sleeve having a thickness such as to make the mechanical resistance of the tube section nearest the welded end when in contact with the fluid in the welding zone without the internal protective layer at least equal to the mechanical resistance of the tube not in contact with the fluid.
Method for the realization of a butt connection at the end of a weldable plastic tube designed for conveyance of a fluid producing a drop in mechanical resistance of said weldable plastic and which therefore comprises an internal layer for protection of the plastic of the tube from contact with the fluid conveyed comprising the steps of:
Weldable plastic tube designed for the conveyance of a fluid producing a drop in mechanical resistance of said weldable plastic and comprising an internal layer for protection of the plastic of the tube from contact with the fluid conveyed, the tube having at least two lengths joined together by butt welding of respective ends, each of said respective ends having a terminal section permanently covered with an external reinforcing sleeve also of weldable plastic to participate in the butt welding of the two lengths of the tube, the sleeve having a thickness such as to make the mechanical resistance of the tube section nearest the welded end when in contact with the fluid in the welding zone without the internal protective layer at least equal to the mechanical resistance of the tube not in contact with the fluid.
Dependencies are inferred from the claim text.