How many feet of head are equivalent to one PSIG?

One PSIG (pounds per square inch gauge) is equivalent to 2.31 feet of head because it measures the pressure exerted by a column of water. This relationship is derived from hydrostatic pressure calculations, where the pressure at a given depth in a fluid is determined by the weight of the fluid above that depth.

In calculating the equivalent head in feet of water, the formula used is:

[

\text{Head (ft)} = \frac{\text{Pressure (psi)} \times 2.31}{\text{Specific weight of water (lb/ft}^3\text{)}}

]

Given that the specific weight of water is approximately 62.4 lb/ft³, when you convert 1 PSIG, you arrive at about 2.31 feet. This figure is critical for water operators, as it helps in understanding how pressure translates into water column heights, which is essential for system design and operation.

This knowledge allows operators to effectively gauge and manage the pressures within their systems, ensuring proper water distribution and system functionality.