1.Description
1.1 DD center latch casing elevators are convention square center door elevators to handle pipes in oil and gas drilling operation.
1.2 DD center door square drill pipe elevators made from high quality alloy steel with both advanced technology and heat treatment. The center latch square casing elevators are verified by strength test and NDT referred to ANSI/ASTM A487.   center latch square casing elevators can handle taper shoulder casing pipe from 4 1/2in to 14in O.D. .at the temperature minus 20℃. The rating loads are as follows: 1350kN, 2250kN, 3150kN
1.3 The 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.
1.4 DD center latch square casing 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.

2.Structural
Type DD center latc square casing elevators are center door elevators, they consist of two main bodies, latch, pins, shield and etc. The two main bodies (right body and left body) are jointed by the hinge pin; the latch is fitted to left main body and can be rotated around it. The latch is equipped with spring with which the latch can be back to its original position. The shield is fitted to latch and can be recovered to the position paralleled to latch with the force of spring. When close the elevator, the shield can enter into the bock of the right body to lock itself. When open the elevator, pull shield and the shield can be discharged from the block in right body, and pull on, the latch can be discharged from right body, and then the elevator is opened. When close the elevator, only to pull the two handles of the elevator toward each other until the latch and shield return to the close position with the force of spring, the elevator is closed. To avoid injure, the elevator is equipped link block. 

3.Specifications for center latch square casing elevator
 Specifications of DD certer latch casing elevators:

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Company Introduction

Xi'an KINGWELL OILFIELD MACHINERY Co., Ltd. (KINGWELL) is a highly reputable supplier for oilfield equipment and services to Oil & Gas industries and provides complete solutions.

With over 10 years developing, we were developed from the beginning drilling service to manufacture factory who produce OCTG, drilling tools, DST tools and Solid control products.

KINGWELL have experienced team, stronger enough to meet any challenge, we do believe honest is the base of business and cooperation; our aim is to build solid relationship with any part of honest. kingwell can provide highly efficient services to its clients resulting in accurate and timely deliveries at the best prices. Our products have been exported to Europe, American and Middle East.