F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
F16L13/00—Non-disconnectable pipe joints, e.g. soldered, adhesive, or caulked joints
F16L13/02—Welded joints
F16L13/0218—Welded joints having an inner or outer ring
F16L13/0227—Welded joints having an inner or outer ring having an inner ring
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Butt Welding And Welding Of Specific Article
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