Terms

Question 1

Back flow

Answer 1

entry of contaminant into potable water system

Question 2

Gravity backflow

Answer 2

backflow when potable supply pipe receives contamination from source above potable line.

Question 3

Backpressure backflow

Answer 3

occurs when pressure in contaminated system within cross connected system is greater than the pressure in the potable system.

Question 4

Back siphonage backflow

Answer 4

Occurs within cross connected system, when a vacuum is formed in the potable system, drawing contaminated fluids.

Question 5

7 ways trap seals could be lost

Answer 5

Siphonage, momentum, oscillation, backpressure, evaporations, capillary action, cracked pipe.

Question 6

aeration

Answer 6

saturate water with dissolved air to drive out other gases. high oxygen content will tend to convert other adverse items to less harmful forms.

Question 7

6 ways municipal surface water is treated

Answer 7

aeration, precipitation, settling, sand filtration, sterilization,

Question 8

Galvanic action

Answer 8

Corrosion due to connection of two different metals (copper/galvanized). Electrons flow from one material to the other, creating a short-circuited battery. Reactions only take place when water is introduced to the 2 different metals.