API 661, Petroleum, Petrochemical, and Natural Gas Industries - Air-Cooled Heat Exchangers, is a standard developed and released by the American Petroleum Institute (API) that provides requirements for the design, fabrication, inspection, testing, and shipping of air-cooled heat exchangers for use in the petroleum, petrochemical, and natural gas industries. This standard was originally published in 1992, with the most recent 7th Edition being released in July of 2013.
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- API 620 - Design and Construction of Large, Welded, Low-Pressure Storage Tanks
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- API RP 573 - Inspection of Fired Boilers and Heaters
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- API RP 575 - Inspection Practices for Atmospheric and Low Pressure Storage Tanks
- API RP 576 - Inspection of Pressure-Relieving Devices
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- API RP 578 - Material Verification for New and Existing Assets
- API RP 580 - Risk Based Inspection (RBI)
- API RP 581 - Risk Based Inspection Technology
- API RP 583 - Corrosion Under Insulation and Fireproofing
- API RP 584 - Integrity Operating Windows
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- API RP 75 - Safety and Environmental Management System for Offshore Operations
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- API RP 934 - Materials and Fabrication of Heavy Wall Pressure Vessels for High-Pressure Hydrogen Ser
- API RP 939-C - Guidelines for Avoiding Sulfidation (Sulfidic) Corrosion Failures in Oil Refineries
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- International Organization for Standardization (ISO)
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