with tension-relief of the weld by means of detachable members, e.g. divided tensioning rings, bolts in flanges

Full Title

Non-disconnectable pipe joints, e.g. soldered, adhesive, or caulked joints ( joints for rigid pipes of plastics F16L47/00) > Welded joints > with arrangements preventing overstressing > with tension-relief of the weld by means of detachable members, e.g. divided tensioning rings, bolts in flanges