Kentucky Boiler Practice Exam

What is the allowable percentage above the MAWP that supplemental pressure devices must control?

1. 15%

2. 21%

3. 30%

4. 25%

The correct answer is: 21%

The correct answer of 21% is significant because it aligns with the established safety and operational standards for pressure vessels and boilers. In the context of supplemental pressure control devices, such as safety valves, it is crucial that these devices activate at a pressure that provides an adequate safety margin above the Maximum Allowable Working Pressure (MAWP). Setting the allowable percentage at 21% ensures that there is a robust buffer to prevent overpressurization, which could lead to catastrophic failures or safety hazards. This percentage reflects a balance between safety and operational efficiency, allowing operators to maintain control over pressure levels without the risk of compromising the integrity of the boiler or pressure system. In industrial applications, adhering to this 21% threshold helps to protect both personnel and equipment, reducing the likelihood of accidents associated with high-pressure systems. This standard is typically derived from engineering best practices and regulatory requirements, cementing its importance in pressure management protocols within the industry.