Question

Any water system that prevents dissipation of building pressure back into the water main shall be provided with an approved, listed, and adequately sized ________ or other approved device?

1) valve
2) pump
3) tank
4) pipe

Answer 1

The correct option 1) is valve, which is a backflow prevention device used in water systems to prevent dissipation of building pressure into the water main.

Step-by-step explanation:

The correct answer is option 1) valve. Any water system that prevents dissipation of building pressure back into the water main is commonly provided with an approved and listed backflow prevention device, which is a type of valve. This valve, often called a check valve or backflow preventer, ensures that water does not flow backwards into the main supply, potentially contaminating it. Such devices are critical in maintaining water quality and protecting the integrity of the water supply system.

In context to the information provided about water systems and pumps, a pump can be used to provide the necessary pressure to move water through a system, as in the example of pumping water to a house located uphill. However, to prevent backflow, specifically a valve designed for this purpose is required in the system. Air-filled tubes near water faucets, also known as air chambers or water hammer arrestors, are used to cushion the water pressure and prevent water hammer, protecting the plumbing.