| 摘要 |
To recondition standardised bung barrels, of one-piece blow-moulded plastics such as polyethylene, the upper cover (4) is cut off mechanically across the barrel axis and separated from the barrel body (2) with a cut (8) under the welded seam (9) holding the cover in place. The cut ring surface (10) of the barrel body (2) is worked to give a smooth welding surface, and the barrel body (2) is cleaned. The cut edge (10) of the barrel body (2) is calibrated, and an upper cover (4) with a filling/emptying bung and ventilation bung is welded to the calibrated cut edge (10) of the barrel body (2) form the new barrel. The welded seam is smoothed, and the barrel is tested for pressure holding and sealing. For a wide throat barrel, a throat ring is welded to the cut edge (10) with a lower projecting flange edge with a smaller dia. than the barrel dia. The welded seam is finished and the barrel tested for sealing. |
