Final answer:
According to the ASME Boiler and Pressure Vessel Code, a boiler with over 500 square feet of heating surface requires at least two safety valves. While the statement might be false as the number of safety valves depends on the boiler's size and design rather than strictly three or more, for large boilers, multiple safety valves are indeed a standard requirement.
Step-by-step explanation:
True or false: In a coil type (fire tube) boiler over 500 sq ft must have three or more safety valves. According to the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code, a boiler with an over 500 square feet of heating surface requires at least two safety valves. The exact number might be more, depending on the boiler's design and capacity, as well as additional safety considerations dictated by the code or operational needs.
In general, safety valves are crucial components of a boiler system as they act as a fail-safe to prevent over-pressurization, which can lead to boiler failure or explosions. The ASME code has specific sections detailing requirements for boiler components, including safety valves. It is important to adhere to these guidelines to ensure the safety and functionality of the boiler.
For large boilers, having multiple safety valves is mandatory, as it ensures that there are sufficient outlets for steam or pressure release in emergency or over-pressure conditions. The exact requirements for the number of safety valves can be found by referring to the pertinent sections of the ASME code relevant to the type and size of the boiler.