Plumbing

Question 1

What are the different types of plumbing pipe, from thickest to thinnest?

Answer 1

Type K
Type L
Type M

Question 2

What is the most common pipe type for supply water?

Answer 2

Type L

Question 3

What is the most common pipe type for condensate lines?

Answer 3

Type M

Question 4

What is Type DWV used for?

Answer 4

Drain & vents

Question 5

What is a blue roof?

Answer 5

A roof where water ponds on the roof by choking the drain system so as to not overwhelm the sewer system

Question 6

What are the pros of using copper piping?

Answer 6

It has more friction

Question 7

What are the cons of using copper piping?

Answer 7

It costs more

Question 8

What are the pros of using plastic piping?

Answer 8

It is cheaper

Question 9

What are the cons of using plastic piping?

Answer 9

It has less friction

Question 10

What are the 3 main types of valves?

Answer 10

Gate, globe and check

Question 11

Where would you see a vacuum breaker in plumbing?

Answer 11

Backflow preventer

Question 12

When is a gate valve used?

Answer 12

Maintenance as it provides no resistance to the system

Question 13

When is a globe valve used?

Answer 13

Typ faucet valve and adds resistance, but at end of plumbing line

Question 14

When is a check valve used?

Answer 14

Backflow preventer

Question 15

Where is a check valve often used?

Answer 15

At the entry to building to ensure if negative pressure is present, there isn’t waste water contaminating the municipal supply

Question 16

What is the formula for determining water pressure?

Answer 16

P = 0.433 x H

Where P = Pressure in psi
0.433 is a unit conversion constant
& H = height from water supply to fixture

Question 17

What is the minimum pressure for fixtures?

Answer 17

4 PSI to 20 PSI

Question 18

What is the typical water main pressure?

Answer 18

50 PSI to 75 PSI

Question 19

What is Blackwater?

Answer 19

Water that has human and food waste

Question 20

What is Greywater?

Answer 20

Waste water that has not been in contact with human or food waste

Question 21

Where might you see an expansion loop?

Answer 21

Hot water piping

Question 22

How do we size pipes?

Answer 22

Pressure and flow

Question 23

What is the water temperature for kitchen and laundry supply?

Answer 23

140F

Question 24

What is the water temperature for a shower?

Answer 24

110F

Question 25

What is the water temperature for handwashing?

Answer 25

105F

Question 26

What unit type should we use to determine there is enough pressure and flow being provided?

Answer 26

Fixture Units - NOT GPM

Question 27

What do traps do?

Answer 27

Provide a water barrier to prevent vent gas coming out of the fixture

Question 28

Where can laundry waste water be used?

Answer 28

Irrigation

Question 29

Where can bathing waste water be used?

Answer 29

After treatment, in the toilet

Question 30

What is a ‘soil stack’?

Answer 30

Human waste vent line from toilet

Question 31

What is a ‘waste stack’

Answer 31

Grey water vent line

Question 32

What is a ‘vent stack’

Answer 32

Vent line that runs parallel to the drainage stack to prevent waste water from higher floors going into the vent line

Question 33

What is a ‘perc test’?

Answer 33

Test to see how long it takes for water to be absorbed

Question 34

What is considered a shallow well?

Answer 34

A well less than 25’ deep

Question 35

What are the 4 types of plastic pipes?

Answer 35

ABS
PE
PVC
PVDC

Question 36

What is the difference between a 1-pipe and 2-pipe system?

Answer 36

2 pipe system adds a return line so that water delivered at the end is the same temp that is delivered first

Question 37

How do you prevent water hammering?

Answer 37

Surge Arrestors

Question 38

What are the 3 reasons to use plumbing insulation?

Answer 38

To keep heat in
To keep coolth in
To prevent condensation