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How many crack growth law options are included in Signal FFS?
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Quest Integrity Group engineers will be involved in the API 2013 Spring Refining andEquipment Standards Meeting April 22-26 in Las Vegas, Nevada. We maintain involvement with API standards such as API 579-1/ASME FFS-1 to ensure our software and services are in compliance with these industry standards and that we offer leading technology solutions to our clients.

Quiz Answer: 4

April 2013

Did you know?
Signal Fitness-For-Service uses the FAD method to predict safe versus unsafe crack-like flaws.

The failure assessment diagram or FAD is the most commonly used method of assessing crack-like flaws. The FAD enhances linear elastic fracture mechanics (LEFM) assessments by incorporating ductility. The FAD extends the crack stability assessment to structures experiencing both brittle and ductile fracture. The FAD is a plot with a limiting curve and points representing the structure of interest. The curve lies on a plot where the x-axis represents the load ratio (Lr) and the y-axis represents the toughness ratio (Kr).

For a particular surface breaking crack size of length 2c and depth a, an Lr - Kr point is computed and plotted on the FAD. A point falling under the limiting curve is considered acceptable or safe. A point falling on the curve is considered critical. A point falling outside the curve is considered unacceptable or unsafe. Signal FFS automatically calculates the acceptability of known flaws and computes limiting flaws sizes and crack life estimates.

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