1.Description

⑴DDZ(T) type center latch bottleneck drill pipe elevators for Top Drive are convention bottleneck center latch elevators to handle pipes in oil and gas drilling operation.

⑵DDZ type center latch bottleneck drill pipe elevators for Top Drive are made from high quality alloy steel with both advanced technology and heat treatment. The elevators are verified by strength test and NDT referred to ANSI/ASTM A487. The elevators can handle taper shoulder drill pipe from 3½EU to 6⅝IEU O.D., at the temperature minus 20℃. The rating loads are as follows: 2250kN, 3150kN, 4500kN and etc.

⑶The sizes of contact surface between elevator and elevator link or between elevator and pipes conform to the specifications of Principal Contact Surface Size for Hoisting Equipment in SY/T 5288 and API Spec 8C.

⑷center latch bottleneck for Top Drive drill pipe elevators have been strictly Volumetric Radiographic Tested and Surface NDE and Verification tested and Ex-work tested, every technical parameters and properties of the equipment offered to customers are in accordance with the specifications of API Spec 8C and SY/T 5035 Elevator link, Elevator and Manual Tong.

⑷The compositions and their representing meanings of DDZ(T) center latch bottleneck drill pipe elevators for Top Drive :

2.Structural

⑴DDZ(T) center latch bottleneck drill pipe elevators for Top Drive Series are constructed in two halves of bodies, latch, latch lock (type 1), or shield (type 2), latch pin, hinge pin, and other spare parts. The two bodies are hinged by hinge pin; the latch is jointed to one body by latch pin and can be rotated around it. The wrench spring is fixed to the latch and can be functioned as restoring. Latch pin and hinge pin are retained by snap spring, which is easy for assemble for disassemble. Shield and wrench spring of type 1 elevator are stationed on latch by shield pin, and the shield can be used to close or open elevator with the force of wrench spring. Latch lock and wrench spring of type 2 elevator are stationed on the latch by bolt. With the force of wrench spring, the latch lock can hook the lock pin of to close the elevator safely. Every elevator has been equipped with two link blocks at both end, such can prevent the elevator fall off from elevator link in lifting operation.

⑵To use the type 1 elevator, pull outward the shield, the upper slope of 45º separate from the body it attached, and pull outward on, the latch can separate from the latch cam of the other body, and then the elevator is opened for operation. To use the type 2 elevator, pull outward the handle of the latch lock, the hook separate from the lock pin with the force of small wrench spring, and pull outward on, the latch can separate from the latch cam of the body, and then the elevator is opened for operation. When close the elevator, grasp the two handle of the two halves body and pull them together, the latch will automatically hook the latch cam, or the shield will press latch or latch lock will hook the hook pin, the elevator will be closed and locked tightly. Then the operation of ascending or descending can be carried out.3.Specifications for center latch bottleneck drill pipe elevator for Top Drive.

⑶Chart for specifications of DDZ center latch bottleneck drill pipe elevator for Top Drive :