During a new pipe installation leak test, what is the preferred method for measuring makeup water volume?

• A. Calibrated makeup reservoir
• B. Flow meter
• C. Gauge
• D. Bucket with measurements

Answer: (A)

During a leak test, you need to know exactly how much water is added to the system as makeup to maintain or reach test pressure, so the volume measurement can be tied to the test results. A calibrated makeup reservoir provides a known, verifiable amount of water added to the line because its capacity and scale are precise, and all makeup water passes through it. This setup minimizes measurement uncertainty and makes it straightforward to document the exact volume used, which is essential for calculating leak rates or validating the test.

A flow meter could track the rate of water flow, but you’d have to integrate that flow over time and ensure the meter accounts only the makeup water, which adds complexity and potential error. A gauge measures pressure, not volume, so it doesn’t tell you how much water was added. A bucket with measurements is prone to spills, reading errors, and is impractical for large-volume tests, making it far less reliable for formal documentation.