I. This kind of mast is equipped with self-elevating raising device and raised & lowered in sections with power of drawworks or hydraulic wire-line winch. It is applicable for offshore drilling platform or limited areas.
II. Its space and height meet the need of installing top drive.
III This kind of mast conforms to API Spec. 4F and is applied API monogram on them.
Model Description: 1. “JJ”denotes mast. 2. “450”expresses max. Static load and the unit of weight is 10KN. 3. “/45” implies the effective working height of the mast (m). 4. “ZJ”means bootstrap mast.