| 摘要 |
<p>A power tong construction (10) in particular designed to annul compulsory forces that may arise within the tong construction during makeup/breakout operations of pipe joints in a string of pipes, is shown. The power tong construction (10) is one unit having a main frame (4) carrying a torque tong (2) and a backup tong (1). The main frame (4) is located on a drill floor on board a vessel or fixed installation, and is moveably arranged in guide rails. The torque tong (2) is loosely suspended and "floatingly" arranged in the power tong construction (10), said power tong (2) thereby having a limited freedom of motion in all directions in the horizontal plane and vertical plane, and has means to counteract external rotation and annulment of compulsory forces, when the power tong makes up/ breaks out pipe joints, arranged between the power tong (2) and the main frame (4).</p> |
