Category: API 661

Winterization in accordance with API 661 Annex C may need to be considered by designers when air cooled heat exchangers are operating in climatic extremes. In order to prevent operating problems in-situ, a temperature safety margin should be added to the critical process temperature to determine the specified minimum tubewall temperature....
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A new Stream Analysis Method option is available in Xace® 6 to model flow bypassing in air-cooled heat exchangers with larger gaps at the edge of the bundle than those required by the API 661/ISO 13706-1:2005 standard. The heat transfer and pressure drop of the bundle can be less than predicted...
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