New York Low Pressure Boiler COF Practice

What is the minimum dial arc on a 2-1/4" gauge?

1. 180°

2. 270°

3. 360°

4. 90°

The correct answer is: 270°

The minimum dial arc on a 2-1/4" gauge is indeed 270°. This measurement is important as it indicates the range over which the dial displays readings. A 270° arc provides sufficient scope for accurately representing pressures or temperatures in low-pressure boiler operations, allowing for a clear visualization of the actual readings without overcrowding the dial face. Using a gauge with a dial arc of at least 270° helps ensure that fluctuations in pressure can be easily interpreted. This is particularly relevant in applications where precise control is necessary for safety and efficiency. A gauge with a smaller arc would not provide the same level of detail, potentially making it harder to assess the operational parameters of the system effectively. In contrast, options like 180° or 90° would restrict visibility and could lead to inaccuracies in readings, while a full 360° dial may not be necessary for the operational requirements of low-pressure systems. Hence, a 270° arc strikes a balance between clarity and functionality.