standard, titled "Brazed Aluminum Plate-fin Heat Exchangers," provides essential requirements for the mechanical design, materials, fabrication, and testing of these exchangers in the petroleum and natural gas industries. GlobalSpec Key Technical Guidelines technical summaries industry responses
, here are the critical operational and design limits established by API 668: Temperature Gradients: Designs must accommodate stream fluctuations of plus or minus 1 raised to the composed with power C per minute and transient changes of up to 60 raised to the composed with power C Maximum Temperature Differences: api 668 pdf
Official copies of API standards are not typically free. You can access them through these official channels: Full PDF and hardcopy versions are available at the API Publications Store Read-Only: titled "Brazed Aluminum Plate-fin Heat Exchangers
API provides free, read-only access to certain safety-related standards in their IBR Reading Room American Petroleum Institute | API material selection criteria mentioned in this standard? api 668 pdf