Class 5 Boiler Practice Exam

What is the pressure equivalent of one inch of water column?

1. 0.036 psig

2. 0.1 psig

3. 0.25 psig

4. 1 psig

The correct answer is: 0.036 psig

One inch of water column is commonly used as a measurement of pressure in various applications, especially in HVAC systems and other fluid dynamics contexts. The equivalent pressure in pounds per square inch gauge (psig) can be calculated using a standard conversion factor. The conversion factor states that one inch of water column is equivalent to approximately 0.036 psi. This means that when measuring pressure, one inch of water column corresponds to a pressure of about 0.036 psig. Recognizing this conversion is essential for operating and maintaining equipment that relies on pressure measurements. Understanding the specific pressure equivalent helps technicians ensure that systems are operating within safe and efficient parameters. Thus, knowing that 1 inch of water column equals roughly 0.036 psig provides clarity and accuracy in pressure monitoring.