API SPEC 4F pdf download Specification for Drilling and Well Servicing Structures 8 Design Specification Specification for Drilling and Well Servicing Structures 1 1 8.1 Allowable Strength 8.1.1 General The steel structures shall be designed in accordance with the Allowable Strength Design code in ANSI/AISC 360-1 6, except as further specified in this standard. ANSI/AISC 360-1 6 shall be used...