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API 579-1/ ASME FFS-1 Fitness for Service on Wood-Fired Boiler Components

A Fitness-For-Service evaluation of a steam drum pressure of a wood-fired boiler was performed to API 579-1 / ASME FFS-1. The 30,000 pound boiler (120 psi) was overheated due to a loss of makeup water and a failure of a low-water cutoff control.

The API 579-1 standard contains very specific methodologies for evaluating pressure vessels that have been damaged or compromised due to operational or environmental factors such as fire, overpressure, corrosion, fatigue, and mechanical damage. Typical damage resulting from these factors includes pitting/loss of metal, embrittlement, residual stress, cracks, and reduced material properties. The net result is often reduced vessel integrity, shortened operating life, or even required repair/replacement.

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