New York Low Pressure Boiler COF Practice

What is the effective stop for a gauge?

1. The maximum pressure point

2. The indicating point at zero

3. The last calibration point

4. The average operating pressure

The correct answer is: The indicating point at zero

The effective stop for a gauge is identified as the indicating point at zero. This point is critical because it serves as a reference for accurate pressure readings. When the gauge is calibrated, it should read zero when there is no pressure in the system. This zero point ensures that any pressure reading above that is accurate and reflects the true pressure within the system. Having a proper zero calibration is essential for assessing the operating conditions and ensuring safety in boiler operation. In contrast, the other answer choices do not represent the effective stop for a gauge. The maximum pressure point refers to the highest pressure the gauge can register, which is important for understanding gauge limits but does not serve as a baseline for measurements. The last calibration point is relevant for determining the accuracy of the gauge after it has been calibrated, but it does not indicate the starting point for measurements. The average operating pressure provides insight into typical operational conditions but is not the reference point from which pressure measurements are derived.