Piping expert witnesses practice in a variety of fields, including industrial process systems, oil and gas pipelines, power plants, and commercial building infrastructure. Some of the most common specialties include pipe stress analysis, pressure vessel design, corrosion and materials, welding, leak investigation, and code compliance. They can opine on the effects of design defects, improper installation, inadequate maintenance, corrosion, vibration, and overpressure on piping failures and safety.