API SPEC 6A: 2018 [paper]

API SPEC 6A Specification for Wellhead and Christmas Tree Equipment, 21st Edition

Includes Errata 1 (2019), Errata 2 (2020), Errata 3 (2020), Errata 4 (2021), Errata 5 (2024), Errata 6 (2024), Addendum 1 (2020), Addendum 2 (2021), Addendum 3 (2022), and Addendum 4 (2024)

This document defines technical requirements for wellhead and Christmas tree equipment used in petroleum and natural gas industries, covering:

• Performance, design, and materials
• Testing, inspection, and welding
• Marking, handling, storage, and shipment
• Purchasing, repair, and remanufacture

Exclusions: Field use, testing, and repair are not covered.

Applicable Equipment Includes:

• Wellhead components: Flanges, gaskets, connectors, valves (gate, plug, ball, actuated), casing/tubing hangers, chokes, actuators, safety valve assemblies.
• Tree assemblies: Surface (SSV), underwater (USV), and boarding shutdown valves (BSDV).

Key Definitions:

• Service conditions: Pressure, temperature, and material class for wellbore constituents.
• Operating conditions: Defined for equipment functionality.
• Product Specification Levels (PSL): Four PSL designations specify technical quality requirements for different applications.

This standard ensures interchangeability, safety, and reliability in wellhead and tree equipment.

API SPECIFICATION 6A