API - American Petroleum Institute Engineerstore.org is your source for standards and specifications from the American Petroleum Institute (API), available in hardcopy or PDF download. The American Petroleum Institute (API) is a leader in the development of petroleum and petrochemical equipment and operating standards covering topics that range from drill bits to environmental protection. These embrace proven, sound engineering and operating practices and safe, interchangeable equipment and materials. Many have been incorporated into state and federal regulations and adopted by ISO for worldwide acceptance. API distributes more than 200,000 publications each year. The publications, technical standards, and electronic and online products are designed to help users improve the efficiency and cost-effectiveness of their operations, comply with legislative and regulatory requirements, and safeguard health, ensure safety, and protect the environment. Most Popular Titles From API: API Std 650 Welded Tanks for Oil Storage, 11th Edition, Includes Addendum 1 (2008), Addendum 2 (2009), Addendum 3 (2011), Errata (October 2011) API Std 1104 (R2010) Welding of Pipelines and Related Facilities - 20th Edition, Includes Errata 1 (2007) and 2 (2008) API Std 653 Tank Inspection, Repair, Alteration, and Reconstruction, Fourth Edition, Includes Addendum 1 (2010), Addendum 2 (2012) ANSI/API 570 Piping Inspection Code: Inspection, Repair, Alteration, and Rerating of In-Service Piping Systems (includes addendas) API RP 500 (R2002) Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division I and Division 2 API Std 2000 Venting Atmospheric and Low-Pressure Storage Tanks: Nonrefrigerated and Refrigerated, Includes Errata (1999) API Std 520 Sizing, Selection, and Installation of Pressure-relieving Devices in Refineries, Part I - Sizing and Selection, Eighth Edition ANSI/API Spec 5L Specification for Line Pipe, Forty-fourth Edition, Includes Errata and Addendums 1 (2009), 2 (2010), and 3 (2011) API Std 620 Design and Construction of Large, Welded, Low-Pressure Storage Tanks, Eleventh Edition, Includes Addendum 1 (2009), Addendum 2 (2010), and Addendum 3 (2012) API RP 1007 Loading and Unloading of MC 306 / DOT 406 Cargo Tank Motor Vehicles