The primary objective of API 579 is to ensure safety while optimizing maintenance costs. Historically, inspection codes (like API 510, API 570, and API 653) provided acceptance criteria, but they lacked detailed methodologies for complex damage mechanisms. API 579 fills this gap by providing rigorous, engineering-level calculation procedures.
is a standard titled “Fitness-for-Service” (FFS) . It provides methodologies to evaluate whether pressurized equipment (vessels, piping, tanks) containing damage or flaws can continue operating safely.
A pressure vessel wall thinned by corrosion from 0.5″ to 0.3″.
: The standard is applicable to a wide range of equipment, including but not limited to pressure vessels, piping, and storage tanks. It is used for both new and existing equipment.
Performed by qualified engineers using more refined data and standard equations. It is less conservative than Level 1, often allowing equipment to stay in service that might otherwise fail a Level 1 check.

Api 579-1 ★
The primary objective of API 579 is to ensure safety while optimizing maintenance costs. Historically, inspection codes (like API 510, API 570, and API 653) provided acceptance criteria, but they lacked detailed methodologies for complex damage mechanisms. API 579 fills this gap by providing rigorous, engineering-level calculation procedures.
is a standard titled “Fitness-for-Service” (FFS) . It provides methodologies to evaluate whether pressurized equipment (vessels, piping, tanks) containing damage or flaws can continue operating safely. api 579-1
A pressure vessel wall thinned by corrosion from 0.5″ to 0.3″. The primary objective of API 579 is to
: The standard is applicable to a wide range of equipment, including but not limited to pressure vessels, piping, and storage tanks. It is used for both new and existing equipment. is a standard titled “Fitness-for-Service” (FFS)
Performed by qualified engineers using more refined data and standard equations. It is less conservative than Level 1, often allowing equipment to stay in service that might otherwise fail a Level 1 check.