Minnesota Boiler License Practice Exam

Is 2.3 feet of water or 27 inches equal to 1 pound per square inch of pressure?

1. Yes

2. No

3. Only if the water temperature is above 212 degrees Fahrenheit

4. None of the answers given

The correct answer is: Yes

The statement that 2.3 feet of water or 27 inches is equal to 1 pound per square inch of pressure is indeed correct. This relationship is based on the hydrostatic pressure formula, where pressure exerted by a column of liquid is directly proportional to the height of the liquid column and the density of the liquid. In this case, water has a specific weight of approximately 62.4 pounds per cubic foot. When calculating the pressure at the base of a 2.3-foot column of water, it can be determined that this height translates to roughly 1 pound per square inch. The conversion from feet of water to pressure in pounds per square inch is defined through the understanding that 1 psi is equivalent to a column of water 2.3 feet in height. Therefore, despite variations in temperature, the fundamental relationship based on hydrostatic principles remains valid, affirming the accuracy of the 2.3 feet of water (or 27 inches) equating to 1 psi. In practical applications, this information is essential for boiler operators to gauge system pressures effectively.