060201a Water Distribution Flow and Water Heaters

Question 1

What is the reason for having a recirculation line on a hot water distribution line?

Answer 1

To supply hot water to the furthest fixtures immediately

Question 2

Ballcock valves come in all shapes and sizes. What is the most important factor about them?

Answer 2

They must be of the anti-siphon type

Question 3

Installing a check valve on a water service near the house shut-off valve…

Answer 3

Creates a closed water system

Question 4

Psi and time limit for testing a water distribution system?

Answer 4

100 psi for 2 hours

Question 5

Maximum pressure at the fixture in a water distribution system?

Answer 5

550 kPa (80psi)

Question 6

A meter bypass must be installed if the meter is…

Answer 6

Larger than 1 1/4”

Question 7

Minimum water service pipe?

Answer 7

3/4”

Question 8

Best form of backflow prevention?

Answer 8

Air gap (2x spout diameter no less than 1”)

Question 9

An air break must be a minimum of…

Answer 9

1 pipe diameter or minimum 1”

Question 10

Ideal test for potable water lines?

Answer 10

Water test (100 psi for 2 hours)

Question 11

Max lead content when soldering water distribution lines?

Answer 11

0.2%

Question 12

Minimum amount of shut offs when constructing a bypass?

Answer 12

3

Question 13

A recirculation line is required when the run of pipe exceeds _____ or _____.

Answer 13

30 metres or 4 stories

Question 14

In buildings other than single family or multi family dwellings these should be placed on every fixture, or at least located to isolate the water serving that room?

Answer 14

Isolation valve

Question 15

Expansion tanks are required on these kind of water distribution systems?

Answer 15

Closed system

Question 16

The addition of a check valve in a water distribution system would make the system a…

Answer 16

Closed system

Question 17

This type of copper may not be bent

Answer 17

Type M

Question 18

These kind of valves should be used when constructing a bypass because their full flow design reduces pressure loss?

Answer 18

Gate or ball valves

Question 19

Most commonly installed water meter size for residential water use measurement?

Answer 19

5/8”

Question 20

5/8” meter spacing requirement?

Answer 20

12” (300mm)

Question 21

3/4” water meter spacing requirement?

Answer 21

14” (350mm)

Question 22

What temperature should a hot water heater be set at?

Answer 22

140°F (60°C)

Question 23

Where should the temperature and pressure relief valve be placed on a hot water heater?

Answer 23

Within 6” of the top of the tank

Question 24

All dip tubes have a small hole in the top side called this?

Answer 24

Anti-siphon hole

Question 25

What is the purpose of the anti-siphon hole in the top of the dip tube?

Answer 25

Prevents hot water from being siphoned out during interruption in the cold water supply

Question 26

Maximum and minimum height off the ground of a hot water heater pressure relief valve outlet pipe?

Answer 26

12” max 1” min

Question 27

A better type of relief device incorporates a __________ or _____ _____ that opens at a temperature of ___ °C ?

Answer 27

Bellows, bimetal disc, 99°C (210°F)

Question 28

The control found on most gas-fired hot water heaters incorporates a thermostatic sensing element into its operation. The thermostatic sensing element is of what design?

Answer 28

Rod and tube

Question 29

This must be installed on the cold water supply if a hot water tank is supplied with cold water near the bottom?

Answer 29

Vacuum breaker

Question 30

Maximum temperature allowed in a hot water tank?

Answer 30

210°F (99°C)

Question 31

An energy cut-off (ECO) can be used instead of a __________ ?

Answer 31

Temperature relief valve

Question 32

Hot water tanks are usually rated for a maximum working pressure of _____?

Answer 32

150 psi