What is the minimum gauge size for a non-mercury gauge of magnitude 3 psig?

The minimum gauge size for a non-mercury gauge of magnitude 3 psig is 2-1/4 inches. This size is significant because it allows for accurate readings and ensures visibility of the readings under operating conditions.

Gauges serve an important role in monitoring pressure, and their size has direct implications on their readability and accuracy. While smaller gauges could theoretically be used, they may not provide the precision needed for safely monitoring pressures in high-pressure systems. A 2-1/4-inch gauge strikes a balance between compactness and functionality, offering a clear and readable measurement without being unwieldy.

In terms of design and specifications, other sizes may either be too large, offering unnecessary bulk or too small, risking the accuracy of readings. Therefore, the choice of a 2-1/4-inch gauge is based on standards that prioritize safety and effectiveness in pressure measurements.