Texas Commission on Environmental Quality (TCEQ). Class C Water License Exam

What type of water tank uses compressed air to provide pressure?

1. Elevated tank

2. Hydro pneumatic tank

3. Gravity-fed tank

4. Storage tank

The correct answer is: Hydro pneumatic tank

A hydro pneumatic tank uses compressed air to provide pressure for the water it contains. This type of tank is specifically designed to store water in a way that maintains a constant pressure, making it ideal for various applications such as irrigation systems, water supply systems, and general plumbing applications. The air pressure in a hydro pneumatic tank forces water out of the tank and into the distribution system when needed. In contrast, elevated tanks rely on gravity to create pressure by being situated at a height, and storage tanks serve primarily as reservoirs without any specific pressure mechanism. Gravity-fed tanks utilize the natural pull of gravity to draw water down to the point of use, while elevated tanks rely on their height to provide pressure through gravitational force aligned with the water distribution system. Therefore, the unique mechanism of compressed air in hydro pneumatic tanks is what distinguishes them as the correct answer for this question.