New York Low Pressure Boiler COF Practice

In what increment should a gauge measuring up to 5 psig be calibrated?

1. 1/10 inch increments

2. 1/4 inch increments

3. 1/5 inch increments

4. 1/2 inch increments

The correct answer is: 1/5 inch increments

The calibration of a gauge that measures up to 5 psig requires precise increments to ensure accurate readings. When a gauge has a maximum reading of 5 psig, the increments must allow for sufficient detail to discern pressure changes easily and precisely within that range. Calibrating in 1/5 inch increments allows for a clear division of the scale that can effectively represent the pressure variations. For example, with a total scale of 5 psi, using 1/5 increment means the gauge will be marked at 1, 2, 3, 4, and 5 psi. This provides clear visibility and easy interpretation of the gauge readings. Using increments that are too large, such as 1/2 inch, would lead to a lack of precision since significant changes in pressure might not be easily discernible. Each increment needs to facilitate accurate monitoring and control of pressure, which is crucial in low-pressure boiler operations for safety and efficiency. Therefore, 1/5 inch increments ensure that the gauge provides a suitable level of detail needed for proper usage.