Which instrument is commonly used to measure pressure during a tightness test?

Which instrument is commonly used to measure pressure during a tightness test?

• A. Pressure gauge or digital manometer
• B. A compass
• C. A dial thermometer
• D. A moisture meter

Answer: (A)

Measuring pressure directly is essential in a tightness test because the goal is to verify the vessel can hold the applied pressure without a drop that would indicate a leak. A pressure gauge or digital manometer is built to read the actual pressure (or pressure differential) inside the system, giving a numeric value you can monitor over time to detect even small changes. During a tightness test you apply a known pressure and watch for any decrease; having a precise, real-time pressure reading makes it possible to determine whether the vessel is indeed tight. A digital manometer can offer higher precision and data logging, which is helpful for documenting stability over the test period. Other instruments aren’t suitable for this purpose: a compass measures direction, a dial thermometer measures temperature, and a moisture meter checks moisture content. None of these provide the pressure reading needed to assess tightness.

Measuring pressure directly is essential in a tightness test because the goal is to verify the vessel can hold the applied pressure without a drop that would indicate a leak. A pressure gauge or digital manometer is built to read the actual pressure (or pressure differential) inside the system, giving a numeric value you can monitor over time to detect even small changes.

During a tightness test you apply a known pressure and watch for any decrease; having a precise, real-time pressure reading makes it possible to determine whether the vessel is indeed tight. A digital manometer can offer higher precision and data logging, which is helpful for documenting stability over the test period.

Other instruments aren’t suitable for this purpose: a compass measures direction, a dial thermometer measures temperature, and a moisture meter checks moisture content. None of these provide the pressure reading needed to assess tightness.