New York Low Pressure Boiler COF Practice

What component protects a boiler from the expansion and contraction of connected steam mains?

1. Control valves

2. Expansion joints

3. Flexible hoses

4. Pressure regulators

The correct answer is: Expansion joints

The correct answer is expansion joints because they are specifically designed to accommodate the expansion and contraction of connected steam mains. When steam is generated and transported through the piping, it heats up and causes the pipes to expand. Conversely, when the steam cools, the pipes contract. Expansion joints are installed in strategic locations to absorb these movements, thereby preventing stress and potential damage to the boiler and piping systems. Control valves are used for regulating the flow and pressure of steam, but they do not absorb the physical movements caused by thermal expansion. Flexible hoses are also useful for connecting piping but are typically not designed for the same level of pressure or thermal expansion absorption as expansion joints. Pressure regulators might control the pressure within the system, yet they do not address the mechanical stresses from contractions and expansions of the piping. Thus, expansion joints serve a crucial function in maintaining the integrity and longevity of the boiler system through changes in temperature and pressure.