What is an example of a device that provides backsiphonage protection?

What is an example of a device that provides backsiphonage protection?

• A. Thermal expansion tank
• B. Double check valve
• C. Pressure regulator
• D. Air gap

Answer: (D)

An air gap is an example of a device that provides backsiphonage protection because it creates a physical separation between the supply water system and a potentially contaminated source. This separation prevents any reverse flow of contaminated water back into the potable water supply due to siphonage, which can occur during conditions of negative pressure in the water system. The air gap is typically established by maintaining a vertical distance between the highest point of the water supply outlet and the flood level of the receiving vessel. This configuration ensures that even if there is a sudden drop in pressure that could cause siphonage, there is no direct path for contaminants to enter the clean water supply. By effectively providing this separation, the air gap is a critical component of backflow prevention, particularly in situations where hazardous materials may exist. Its simplicity and reliability make it a widely recognized method for ensuring the safety of potable water systems.

An air gap is an example of a device that provides backsiphonage protection because it creates a physical separation between the supply water system and a potentially contaminated source. This separation prevents any reverse flow of contaminated water back into the potable water supply due to siphonage, which can occur during conditions of negative pressure in the water system.

The air gap is typically established by maintaining a vertical distance between the highest point of the water supply outlet and the flood level of the receiving vessel. This configuration ensures that even if there is a sudden drop in pressure that could cause siphonage, there is no direct path for contaminants to enter the clean water supply.

By effectively providing this separation, the air gap is a critical component of backflow prevention, particularly in situations where hazardous materials may exist. Its simplicity and reliability make it a widely recognized method for ensuring the safety of potable water systems.