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Features of Mast

l Mast (derrick) is generally classified as A type, K type (open front type), tower type and mast type etc.

l A type mast: its leg section is rectangular or triangle shape, with better loading capacity and

stability, connected with pins between sections, installed at low level and erected or lowered down integrally by drawworks and A-frame.

l K type mast, namely open front mast, its cross section is a П shape truss structure, its both sides are composed of several pieces or segments, its back is rigid frame or pole system of truss, connected with pins or bolts between segments and members, may be installed at low level and erected or lowered down integrally by drawworks or hydraulic cylinder. It has the advantages of convenient installation and teardown, excellent rigidity.