The American Petroleum Institute (API) typically revises standards every 5–10 years. Given that the last major edition was 2021, a 2024 update is possible but .
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As of my latest update, the official API 661 (Air Cooled Heat Exchangers) standard is still primarily in the 2021 edition. The 2024 edition has not been formally released by the American Petroleum Institute. If you have seen a reference to "API 661 2024," it may be a future release, a draft, or a typo. This post explains how to get the correct current version and what to look for in a future update. Everything You Need to Know About API 661 (2024 PDF) – Is It Released? If you work in oil refining, petrochemicals, or power generation, you know the importance of API Standard 661 . This is the definitive global standard for Air-Cooled Heat Exchangers (ACHEs). The 2024 edition has not been formally released