Abstract
Double link elevators ETAD-50 and ETAD-80 having an automatic gripping device have been developed by AzINMash for clutching and clamping tubing strings and drill pipes and for holding in suspension a column of pipes during hoisting operations for major oil well repairs. The elevator ETAD consists of chasis, detachable grip, stops, a closing device, and two safety locks. Its advantages include: use of a single elevator, reduction of weight, convenience of handling of pipe, less movement of maintainence personnel, and longer service life. The technical parameters of ETAD are compared to EKhL, EZN, and EB type elevators and it is shown that ETAD increases labor productivity over the bulky EB type elevator.
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