API Standard 661 (Petroleum, Petrochemical, and Natural Gas Industries—Air-Cooled Heat Exchangers) was reconfirmed in July 2024, verifying the seventh edition as the current, active standard. It establishes strict requirements for the design, fabrication, and testing of air-cooled heat exchangers, often used in conjunction with ASME Section VIII for mechanical integrity. The 2024 reconfirmed standard is available for purchase in PDF and hardcopy formats from technical document retailers. Purchase API Std 661 (R2024) at Accuris AI can make mistakes, so double-check responses Copy Creating a public link... You can now share this thread with others Good response Bad response 3 sites API Std 661 (R2024) Most Recent - Accuris Standards Store Full Description. This standard gives requirements and recommendations for the design, materials, fabrication, inspection, testing... Accuris Standards Store API Std 661 (R2024) Most Recent - Accuris Standards Store Petroleum, Petrochemical, and Natural Gas Industries - Air-cooled Heat Exchangers, Seventh Edition. standard by American Petroleum... Accuris Standards Store API STD 661:2013(R2024) - Intertek Inform Jul 30, 2013 —

Tubes in single-pass or the last pass of multi-pass condensers must slope downward at least 10 mm/m (1/8 in./ft) toward the outlet.