New York Low Pressure Boiler COF Practice

When is a valve body made of cast iron permitted for use?

1. On low pressure water boilers

2. Never on high temperature water boilers

3. Always in commercial applications

4. Only for residential boilers

The correct answer is: Never on high temperature water boilers

A valve body made of cast iron is permitted for use in certain applications due to the material's properties. Cast iron is known for its strength and durability, making it suitable for low-pressure systems where temperature and pressure are not excessively high. Specifically, the use of cast iron valve bodies is typically restricted in high-temperature water boilers because the material's brittleness at elevated temperatures can lead to failures. In high-pressure or high-temperature scenarios, the integrity of the valve body may be compromised, resulting in safety hazards. Therefore, the choice to state that cast iron is never permitted on high temperature water boilers reflects the need for safer materials, like bronze or stainless steel, that can withstand these conditions. Other options might suggest various scenarios where cast iron could be acceptable, but they do not adequately address the critical limitations posed by high temperatures and pressures that affect the material's performance and safety. Thus, the assertion that cast iron valve bodies are never permissible for high-temperature water boilers is accurate and aligns with safety standards in boiler operation.