API Spec 6A is an International Standard that specifies requirements and gives recommendations for the performance, dimensional and functional interchangeability, design, materials, testing, inspection, welding, marking, handling, storing, shipment, purchasing, repair and remanufacture of wellhead and christmas tree …

API 6D and API 6A are both used as standards for valves in the oil and gas sector. API 6D is the standard for valves in pipelines, such as in rigs, platforms, skids and production plants. API 6A is the specification for valves used in wellhead equipment and Christmas tree accessories.

PSL stands for Product Specification Levels. PSL stands for Product Specification Levels. Pipes are used in different types of environments such as corrosive and non-corrosive. Pipes used in the severe corrosive environments required material that can withstand such process conditions.

PSL-3 Equipment meets all the requirements of API Spec 6A PSL-2 and: Restricts the tolerance of material chemistry. PSL-3G includes all the requirements of PSL 3 plus additional practices described in API 6A, Annex A. PSL-3G designates an additional gas-testing requirement for assembled equipment.

A standard developed for the American Petroleum Institute, the API 6A specification shares many characteristics with ANSI/ASME flanges. They are dimensionally similar, however their minimal design requirements for operating pressure begin in the 2000# class, which is derived from the ASME/ANSI 600# class.

API flanges are manufactured to resist corrosion, pitting, and cracking due to the stress of caustic solutions they are exposed to. This makes API flanges the only choice for refineries that handle substances such as oil and explosive gases, which require high pressure and temperature tolerances.

PSL-1 is a loose standard quality for line pipe, whereas PSL-2 contains additional testing requirement, stricter chemical physicals, along with different ceiling limits of mechanical properties, and require Charpy impact testing conditions.

API Specification 6A covers wellhead and tree equipment as follows: API Specification 6A Wellhead Equipment Valves, Chokes, and Actuators Plugs, Connectors, and Gaskets Other Equipment Casing and tubing heads (housings and adapters) Single completion valve Integral, blind, and test flanges Trees

ANSI/API SPECIFICATION 6A TWENTIETH EDITION, OCTOBER 2010 EFFECTIVE DATE: APRIL 1, 2011 CONTAINS API MONOGRAM ANNEX AS PART OF U.S. NATIONAL ADOPTION ISO 10423:2009 (Modified), Petroleum and natural gas industries—Drilling and production equipment— Wellhead and christmas tree equipment Special Notes

DEsigN, CoNstRuCtioN, MARKiNg FoR APi 6A vAlvEs BFE manufactures a complete line of qual- ity API 6A valves, and can provide the exact valves and actuators to meet the most de- manding application requirements.

We are pleased to announce the publication of the 21 st edition of Specification 6A, Wellhead and Tree Equipment. This new edition provides technical updates that have reached consensus within API’s Subcommittee on Valves & Wellhead Equipment and will now give industry consistent practices in these respective areas of the standard.