conform to API Spec 4F

The mast (derrick)FYPE can supply include A type, K type, tower type and mast type etc.

A type mast:

Its leg section are rectangular or triangle shape, with better loading capacity and stability, connected with pins between sections, installed at low level and erected of lowered down integrally by drawworks and A-frame.

K type mast:

Namely front opening mast, its transverse section is a II shape truss structure, its both side are built up of several pieces or segments, its back are rigid frame or pole system of truss, connected with pins or bolts between segments and members, may be installed at low lever and erected of lowered down integrally by drawwork or hydraulic cylinder, have the advantage of installation and teardown convenient and excellent rigidity.