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Why is inches of water column used to measure gas pressure instead of psig?

A. It is a more precise measurement.
B. Gas manifold pressures are too small for accurate measurement in PSI.
C. Gas pressures must be accurately set for correct operation.
D. All of the above.

Answer :

Inches of water column is preferred for gas pressure measurement because it provides more accuracy and precision than psig, and gas pressures must be set accurately for proper operation in sensitive applications.

The inches of water column (WC) measurement is commonly used to measure gas pressure because it provides a more accurate and precise measurement than pounds per square inch gauge (psig). Gas manifold pressures are typically too small for accurate measurement in PSI, which is better suited for high-pressure systems. In addition, gas pressures must be accurately set for correct operation, especially in sensitive applications such as in medical devices or laboratory equipment. Inches of WC can provide a more precise measurement, allowing for more accurate adjustments and control of gas pressure. Therefore, the answer is D, as all of the above reasons contribute to the preference of inches of WC for measuring gas pressure.

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