This standard focuses on the design, construction, operation, maintenance, integrity management, and emergency response for both dense-phase (including liquid and supercritical state) and gas-phase carbon dioxide (CO2) related to pipelines and related appurtenances and facilities.

The provisions are applicable to onshore gathering and transmission pipelines and related facilities used to convey CO2 in gas- and dense-phase conditions. Offshore pipelines and sequestration facilities were considered in the development of this document to support these applications.

Carbon capture and sequestration involves collection, transportation, and storage of CO2; however, this document does not specifically address processes and procedures associated with capture, injection, utilization, or storage.

This standard gives requirements and recommendations for the mechanical design, materials selection, fabrication, inspection, testing, and preparation for shipment of brazed aluminum plate-fin heat exchangers for use in the petroleum, petrochemical, and natural gas industries.

This document helps to establish the technical basis for accurately using the double cantilever beam (DCB) test.API sponsored research on the methodology of continuous DCB testing. This work established the testing conditions of specimen design, arm displacement, chemical makeup of the aqueous test solution (composition and pH), time, and temperature. This has brought the state of the art to the point where the proper arm displacements can be selected for both NACE standard conditions and for fit-for-purpose conditions, thereby minimizing the number of invalid tests.

The rapidly expanding use of C-110 casing in the search for new supplies of oil and gas in sour formations has made it crucial to accurately characterize the resistance of such tubulars to sulfide stress cracking (SSC). This is best done by the DCB test, the only test that gives a numeric value from each specimen (other tests rely on the statistical analysis of fail/no-fail results, a process that does not give such rapid and precise ratings as does the DCB test). For this reason, the DCB test has gained wide acceptance since it was standardized by NACE in 1990.

This bulletin provides technical information that may be utilized when planning and selecting the type and design of wells associated with carbon capture, utilization, and storage (CCUS). The intent of this document is to provide the user with comprehensive information on the suitability of ordinary Portland cement (OPC) as a barrier in CCUS applications. This document is not intended to be an exhaustive or prescriptive tool; rather, it contains information to increase knowledge and assist industry in the safe and long-term reliability of OPC in CCUS applications The studies cited in this bulletin were performed with OPC that met the requirements of API 10A.

This publication addresses the design, operation, and maintenance of liquefied petroleum gas (LPG) storage facilities from the standpoints of prevention and control of releases, fire-protection design, and fire-control measures. The history of LPG storage facility failure, facility design philosophy, operating and maintenance procedures, and various fire-protection and firefighting approaches is presented. Since this publication supplements API 2510 and provides the basis for many of the requirements stated in that standard, it shall be used in conjunction with API 2510. In case of conflict, API 2510 shall prevail. Alternate designs are acceptable provided equal safety can be demonstrated.

The storage facilities covered by this publication are LPG installations (storage vessels and associated loading/unloading/transfer systems) at marine and pipeline terminals, natural gas processing plants, refineries, petrochemical plants, and tank farms. The following types of LPG installations are not addressed:

a)    underground storage, such as buried tanks, storage caverns, salt domes, or wells;

b)    mounded storage tanks;c)    refrigerated storage at pressures below 15 psi (104 kPa) gauge;d)    installations covered by NFPA Codes 58 or 59;e)    Department of Transportation (DOT) containers;f)    those portions of LPG systems covered by NFPA Code 54 (ASME Z223.1);g)    small installations with a single LPG tank of less than 2000-gallon capacity;h)    process equipment for LPG manufacture or treatment preceding LPG storage.

It should be noted that since the casing down which stimulation fluids are pumped is typically casing in MFHWs, this standard will henceforth only use the term “casing” instead of “casing or tubing”. This nomenclature is solely for the sake of convenience and concision; the testing protocols in this standard are equally applicable to casing and tubing connections.

The provisions of this publication pertain to new installations, but may also be used to review and evaluate existing storage facilities. The applicability of some or all of these provisions to facilities and equipment already in place or in the process of construction or installation before the date of this publication will have to be considered a case-by-case basis.

This standard describes a testing protocol for flare gas meters. This includes a discussion of the testing to be performed, how the test data should be analyzed, and how an uncertainty is determined from the testing of the meter. The standard does not include the general guidelines to flare gas metering that are covered under Chapter 14.10.

API RP 1646:2025 PDF

Please note that any addenda or errata may not be included in translated editions of this standard.This Recommended Practice, a key component of the API WorkSafe Program, provides the recommended minimum safety procedures for working at retail petroleum/convenience facilities. It also details how to develop a task specific Job Safety Analysis that should be completed before any work may begin.

This document also provides the user with a general awareness of safety issues associated with maintenance and construction work at retail petroleum/convenience facilities, including service stations. It also highlights many of the Federal OSHA requirements that may apply to maintenance and construction work in the retail petroleum/convenience business.

API Std 599:2025 PDF

This standard specifies the requirements for quarter-turn metal plug valves, including the lift plug type, for petroleum, petrochemical, and industrial applications.

This standard is applicable to:

This document addresses dynamic riser systems that are part of a floating production system (FPS). A dynamic riser is a subsystem in an FPS. For guidelines for design, construction, installation, operation, and maintenance of FPS, refer to API 2FPS and API 2T.

The provisions of this standard do not apply to the riser systems of mobile offshore drilling units (MODUs). For MODU riser design, refer to API 16Q.

API Std 561:2026 PDF

This standard specifies requirements and guidance for the design, specification, materials, refractory lining systems, fabrication, inspection, testing, and preparation for shipment of direct-fired heaters, including air preheaters, fans, and burners for general refinery service.