API SPEC 4F

Abstract

This specification states requirements and gives recommendations for suitable steel structures for drilling and well servicing operations in the petroleum industry, provides a uniform method of rating the structures, and provides two Product Specification Levels (PSLs). <br>This specification is applicable to all new steel derricks, masts (including masts with guy lines and service rig masts), substructures, and crown block assemblies with a date of manufacture after the effective date of this specification. <br>Annex A provides a number of standard Supplementary Requirements (SRs) that apply only if specified by the purchaser. Annex B is an informative Annex to assist in an understanding/application of this API specification. Annex C is an informative Annex regarding the API Monogram Program and the API Monogram marking requirements. Annex D is an informative Annex providing guidelines to assist the Purchaser with purchasing equipment manufactured to the requirements in this API document.