lesson 11

Question 1

What is cross connection in plumbing?

Answer 1

• a plumbing connection
• through which contaminants
• from drains, sewers or waste pipes
• can potentially enter drinkable water supply

Question 2

What is a direct cross connection

Answer 2

when drinkable water system is directly connected to drain, sewer, or non potable water supply

Question 3

True or false: non potable pipes/sewer pipes are permitted above food prep/food storage areas

Answer 3

false

Question 4

What are the 2 ways of back flow?

Answer 4

• back pressure

- back siphonage

Question 5

What is back pressure?

Answer 5

• increased pressure from non potable pipes

- pushes unclean water into potable pipes

Question 6

What is back siphonage?

Answer 6

• decreased pressure in potable pipes

- allows non potable water to enter into potable pipes

Question 7

What is the only reliable back flow prevention device?

Answer 7

air gap

Question 8

What should be the length of the air gap?

Answer 8

• at least 2x the diameter of water inlet

- no less than 1 inch

Question 9

How must a horse bib type vacuum breaker be attached?

Answer 9

-must be screwed onto threat faucet

Question 10

True or false - hoses installed on sinks can be submerged in water

Answer 10

false

Question 11

What is the function of an atmospheric vacuum breaker

Answer 11

to prevent back flow from back pressure/back siphonage

Question 12

When is the double vent check valve used?

Answer 12

• on soda carbonators
• to prevent backflow of carbonated water
• into water supply pipes

Question 13

Why must carbonated water not get into pipes?

Answer 13

• it is acidic
• may cause pipes to erode
• may cause metal poisoning

Question 14

How does doubled vented check valve work?

Answer 14

-allows co2 to escape into air during backflow

Question 15

8 pieces of equipment requiring back flow prevention

Answer 15

• urinals
• potato peelers
• garbage grinders
• water closets
• steam tables
• ice machines
• dishwashers
• sinks

Question 16

What is the function of an air break?

Answer 16

• no direct connection
• between sewage systems
• and drains from equipment which has anything to do with food

Question 17

True or false - an airbreak is not required at hand wash sinks

Answer 17

true

Question 18

Where must indirect sewer connections be located?

Answer 18

• w/in 2 feet of equipment

- inlet side of grease interceptor

Question 19

Equipment requiring indirect waste connections

Answer 19

• sinks
• fridges/freezers
• ice makers/storage bins
• steam tables/kettles
• dipper wells

Question 20

Where does grease interceptor need to be installed?

Answer 20

• waste line from pot washing sinks
• floor drains
• food scrap sinks
• scullery sinks
• scraper section of commercial dishwasher

Question 21

How much grease should interceptors be removing?

Answer 21

-at least 90 %

Question 22

True or false: fats, oils, grease are prohibited from being discharged into public sewers

Answer 22

true

Question 23

Types of vacuum breakers

Answer 23

• hose bib type vacuum breaker

- atmospheric vacuum breaker

Question 24

What are vacuum breakers?

Answer 24

devices intended to protect against backflow

Question 25

Difference between air gap and air break

Answer 25

Air break: unobstructed vertical distance through the air separating food related equipment and drain pipes

Air Gap: unobstructed vertical distance through air separating inlet of potable water from potentially contaminated source