Manufacturing : How we build your rigs API / American Petroleum Institute Specifications   All New Rig Components   NorthStar's Manufacturing Plants   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 oilfield drilling and workover equipment to the guidelines for API Spec 4-F and are in the application process.

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