API SPec 4F-2020 (2023) PDF

Full title and description

API SPEC 4F:2020 — Specification for Drilling and Well Servicing Structures, Fifth Edition; includes Addendum 1 (2023). This specification sets requirements and provides recommendations for the design, manufacture, inspection, marking and rating of steel derricks, portable masts, crown block assemblies and substructures used in drilling and well servicing operations.

Abstract

This document provides a uniform method of rating drilling and well-servicing structures and defines two product specification levels (PSLs). It covers structural design loads, materials, fabrication, inspection and testing, marking, and purchaser-specified supplementary requirements. Informative annexes provide guidance on purchasing, monogram marking, and application. The 2023 addendum updates referenced design code alignment and clarifications to the 2020 edition.

General information

• Status: Current / Active (5th edition with Addendum 1 issued 2023).
• Publication date: 1 June 2020 (base standard); Addendum 1 published August 2023.
• Publisher: American Petroleum Institute (API).
• ICS / categories: 75.180 (Equipment for petroleum and natural gas industries); 77.140 (Iron and steel products).
• Edition / version: 5th Edition (2020) with Addendum 1 (2023).
• Number of pages: Core specification approximately 65–66 pages; Addendum 1 is a short adjunct (2 pages).

Scope

Applies to new steel drilling and well-servicing structures (derricks, masts, substructures and crown block assemblies) manufactured after the effective date of the specification. It defines minimum technical and quality requirements, design loads and rating methods, inspection and marking requirements, and optional purchaser-specified supplementary requirements (SRs). The addendum clarifies references and aligns certain design provisions with current steel design codes.

Key topics and requirements

• Definitions and classification of structure types (derricks, masts, portable masts, service rig masts).
• Design principles and required design loads (static, wind, service/load combinations) and rating methodology.
• Material specifications, welding and fabrication quality requirements.
• Product Specification Levels (PSL) that set differing technical and QA requirements.
• Inspection, testing, nondestructive examination and acceptance criteria.
• Marking, documentation and API Monogram program guidance for eligible equipment.
• Annexes with supplementary requirements (SRs) and buyer guidance (informative annexes on purchasing and monogram marking).

Typical use and users

Used by drilling contractors, rig manufacturers and fabricators, purchasers (operators and service companies), inspection and certification bodies, engineering consultants and classification societies to specify, design, fabric- ate, inspect and rate drilling and well-servicing structures. It is referenced in procurement documents, equipment design records and routine inspection regimes.

Related standards

Commonly referenced and related documents include other API specifications and recommended practices for drilling equipment and lifting/hoisting systems (for example API Spec 7K, API Spec 8A, API RP 9B and API Spec 5 series), national steel design codes and ISO standards for fixed steel offshore structures. ISO 19902 and various API RPs and Specs are often cross-referenced.

Keywords

drilling structures, well-servicing structures, derrick, mast, crown block, substructure, API Spec 4F, rating, product specification level, PSL, inspection, API Monogram, addendum 2023.

FAQ

Q: What is this standard?

A: API SPEC 4F:2020 is the American Petroleum Institute specification that establishes minimum requirements for the design, manufacture, inspection and rating of drilling and well-servicing steel structures; the 5th edition is dated 2020 and includes Addendum 1 issued in 2023.

Q: What does it cover?

A: It covers structural design loads and rating methods, materials, fabrication and welding requirements, inspection and testing, marking, and purchaser-specified supplementary requirements and includes informative annexes to aid purchasing and monogram use.

Q: Who typically uses it?

A: Drilling and well-servicing rig designers and manufacturers, drilling contractors, operators, purchasing/specification engineers, inspectors and certifying bodies use the specification to ensure equipment meets industry-accepted minimum safety and performance criteria.

Q: Is it current or superseded?

A: The 5th edition (2020) with Addendum 1 (2023) is the current published version; users should apply the base 2020 text together with the 2023 addendum where applicable. Check API publication notices for any later amendments.

Q: Is it part of a series?

A: Yes—API publishes many equipment-specific specifications and recommended practices for drilling and production equipment (e.g., API Specs and RPs covering hoisting equipment, drill-string elements and wire rope) and 4F is the API document focused specifically on drilling and well-servicing structures.

Q: What are the key keywords?

A: drilling structures, well-servicing, derrick, mast, crown block, rating, PSL, API Monogram, fabrication, inspection, Addendum 1 (2023).