1. The upper support of the mast is installed when the inclined angle is more than 20°, which can make sure the stability of the mast. When it is in 90° condition, the mast is vertical. The maximum inclined angle of the mast is 45°. Minimum adjustment angle for every time is 5°. When it is in 45° condition, the maximum lifting force is 40metric ton.

2. The mast is matched with hydraulic telescopic casing, and then the mast is conformed to API 4F, which is suitable for API Range 2 DP and API Range 3 casing pipe.

3. Max. stroke of the top drive is 15,000 mm (49 ft). Crane is not used for the installation of the auxiliary support, only 5T forklift is adopted.

4. The headroom of the substructure is 2500mm, meeting the needs of the installation of 28-21 BOP and four-way joint.  

5. The design and manufacture conforms to API SpecQ1, 4F, 7K, 8C, 16C and APIRP500, performing the standard of GB/T 30216-2013 and GB1589-2016. The design idea of people orientated is adopted, intensifying the methods of safety protection and inspection to meet the needs of HSE regulation.