Manufacturing : How we build your rigs API / American Petroleum Institute Specifications   All New Rig Components   Manufacturing Plant   Our Engineering Process   Rig Training and Support	API Spec 4-F / American Petroleum Institute Specifications API Spec 4-F covers drilling and well servicing structures: Derricks, Masts, Crown Block Assemblies, and Substructures We manufacture oil and gas drilling equipment and oilfield workover equipment to API Spec 4-F.

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