Minnesota Boiler License Practice Exam

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Valves and fittings on feedwater piping must supply feedwater at what percent of Maximum Allowable Working Pressure (MAWP)?

106%
125%
175%
200%

The correct answer is: 125%

Valves and fittings on feedwater piping are required to be designed to handle at least 125% of the Maximum Allowable Working Pressure (MAWP). This is a safety measure that ensures the integrity of the system under various operating conditions, including potential pressure fluctuations that can occur during operation. Feedwater systems are critical since they supply water to the boiler, and any failure in this component could lead to significant operational issues and safety hazards. The 125% standard is based on recognized engineering practices and codes that aim to bolster safety margins and reduce the risk of failure. Thus, designing valves and fittings to this percentage provides assurance that they can withstand typical pressures encountered in service, including those resulting from potential water hammer effects and other transient pressures. This approach is consistent across various boiler codes and standards, reinforcing the importance of robust safety protocols in boiler operation and maintenance.