Water Distribution

Front 1

What are 2 reasons for installing a control valve on the cold supply to the Hot water tank?

Back 1

1) to turn of water to tank should it be necessary to drain or replace it.

2)to isolate the Hot Water supply to repair faucets and replace washers

Front 2

Why must cold water always enter the bottom of the tank on a HWH?

Back 2

The cold water enters the bottom of the tank to ensure it doesn’t mix with hot water at the top of the tank.

Front 3

What is the purpose of a sacrificial Anode?

Back 3

Reduced corrosion due to electrolysis

Front 4

Why are gas and electric tanks heavily insulated?

Back 4

To prevent or minimize heat loss

Front 5

What coatings must be applied to the steel tank to prevent corrosion?

Back 5

Galvanized coating, glass or stone lining

Front 6

Why is a T&P pressure valve required on a Hot Water Tank?

Back 6

To prevent a Hot Water tank from exploding due to water flashing to steam and resulting in 1700 times expansion in volume .

Front 7

State 2 advantages of an electrically heated tank?

Back 7

1) noiseless

2)more choice of location

Front 8

Name 4 areas of domestic hot water tank installations to which NPC code applies:

Back 8

A)The cold water supply must have a shut off near the tank

B) T&P valve shall be located within 6” of the top of the tank

C)A device to shut of the electricity of gas shall be installed when the water reaches the desired temperature

D)Every pipe that conveys water from the Temp,Pressure or combined relief valve must meet specified requirements

Front 9

What size shall a discharge pipe from a T&P valve be?

Back 9

Same size as the inlet

Front 10

Where should the outlet terminate?

Back 10

No more than 300mm (12”) above the floor

Front 11

What alteration may be made to a T&P valve?

Back 11

None! ****

Front 12

What device is installed to prevent a Hot Water Tank from exploding ?

Back 12

A T&P relief valve

Front 13

What is meant by thermal lag on a Hot water supply line?

Back 13

Thermal Lag is undesirable time required to wait for hot water at the faucet outlet

Front 14

What can be done to prevent a T&P valve from liming up?

Back 14

Use plastic coatings on sensing elements and installing the T&P valve in a vertical position

Front 15

At what temp do disable plugs melt?

Back 15

210•F

Front 16

How should a T&P valve be sized ?

Back 16

According to burner input ratings.

Front 17

What is a corporation Main Stop?

Back 17

Underground valve Hot Tapped into the city water supply underground to send potable water to the Curb Cock.

Front 18

What is a corporation Main Stop composed of?

Back 18

Brass or Red Bronze

Front 19

What is the goose neck or settlement loop for and what is it made of?

Back 19

Prevent breakage due to earth heaving. Made of soft copper (K or L), connected by brazing, compression or flare fittings.

Front 20

What’s a Curb cock made of?

Back 20

1/4 turn Plug valve made of red brass or bronze

Front 21

Minimum size of water service line?

Back 21

3/4”

Front 22

What type of Valve is the main shut off?

Back 22

Gate or Ball Valve

Front 23

Where is a drain required?

Back 23

Lowest point on 1” or larger water distribution lines.

Front 24

What is the purpose of the bypass?

Back 24

To service the meter without shutting off water

Front 25

How many valves are needed for a bypass?

Back 25

3

Front 26

What is the piping downstream of shut off called?

Back 26

Water distribution

Front 27

On what fixtures are isolation valves mandatory?

Back 27

Water closets

Front 28

Min size supply line to a fixture?

Back 28

3/8”OD

Front 29

Maximum length of a connector hose ?

Back 29

2 1/2’feet

30”

/ 750mm

Front 30

What type of flow pattern is a T&P valve?

Back 30

Angle like a Globe

Front 31

Minimum size of relief/Blow Off tube?

Back 31

3/4” and shall not reduce in size

Front 32

Can Relief Tubes have valves installed on its end or on its length?

Back 32

**** No

Front 33

When is a drain pan for a hot water heater required?

Back 33

When installed on a wood sub floor, ceiling space or suspended from the ceiling

Front 34

Min dimensions of a drain pan :

Back 34

2” wider on all sides, and 1” deep

Front 35

Minimum drain size?

Back 35

2x larger than T&P discharge

Front 36

Name the two types of hose bibs

Back 36

Frost free ( stem) and w/ stop and waste valve

Front 37

Define velocity and pressure

Back 37

The rate at which fluid flows and the force exerted to the walls of the pipe

Front 38

What effect does unreamed pipe have on the flow of water in a pipe?

Back 38

Causes turbulence

Front 39

When does water hammer occur?

Back 39

When water is forced to change direction or stop suddenly

Front 40

List 3 ways to prevent water hammer

Back 40

A) use shock arresters

B) Open Valves Slowly

C)Air Chambers

Front 41

List 4 causes of Water Hammer

Back 41

A) quick closing valves

B)Sudden changes in direction

C) Temperature differences in liquids

D)Water stopping suddenly

Front 42

How do you recharge an air chamber ?

Back 42

Drain the system and refill

Front 43

What 5 things must be known in order to size a water supply system?

Back 43

A) Total developed length of a water service pipe

B)minimum static pressure of at the property line?

C)Length of distribution pipe, from building isolation to the furthest fixture served

D)water pressure at highest fixture served

E) Total Hydraulic Load

Front 44

The minimum working pressure at the fixture ____________

Back 44

Confirms to manufacturers specifications

Front 45

The Maximum working pressure at the fixture never exceeds________________static pressure.

Back 45

550KpA

Front 46

What table would you find the fixture unit value for a urinal with a direct flush valve?

Back 46

Sizing of water distribution systems with urinals for direct flush valves

Front 47

When sizing multiple water closets with direct flush valves , does the furthest WC from the distribution supply have the largest or smallest load?

Back 47

Largest (40)

Front 48

What is the minimum air Gap on a lavatory?

Back 48

1”

Front 49

How must the water supply to lab sinks be protected from Back flow?

Back 49

Approved Backflow Preventer

Front 50

How would you find the hydraulic load, fixture units for a commercial Dishwasher?

Back 50

Manufacturers recommendations

Front 51

How would you find the hydraulic load for a 1/2” hose wye?

Back 51

Use hose bib, 1/2” private use fixture unit total from table 2.6.3.2.A. Times two.

Front 52

Potable water system AIR pressure test:

Back 52

700 KpA for 2hrs

Front 53

Good luck

Back 53

Bitch

Front 54

List 2 sizes of automatic urinal flush tanks

Back 54

3 gallon

5 gallon

Front 55

List 2 types of pressure balancing valves

Back 55

diaphragm and cartridge

Front 56

List 3 types of temperature sensing valves

Back 56

Bi Metal spring

Paraffin cartridge

Volatile liquid filled bellows

Front 57

Primary use of pressure balanced valves in a residence?

Back 57

Tub and shower valves

Front 58

Temperature sensing device will deliver water at a maximum temperature of ______•F

Back 58

120•F

Front 59

Which valve has the fastest reaction to temperature change?

Back 59

Paraffin cartridge

Front 60

An inline automatic trap delivers a spurt of water when:

Back 60

The faucet opens and closes

Front 61

What term is used to describe water piping inside a building?

Back 61

Distribution piping

Front 62

What is the metric equivalent to pressure expressed as?

Back 62

KPA

Front 63

What is the minimum size of a water meter?

Back 63

5/8”

Front 64

What does a water meter do?

Back 64

Measures volume of water passing through

Front 65

List 2 types of materials to make an automatic flush tank

Back 65

Vitreous China

Stainless steel

Front 66

Which is the most commonly used type of meter?

Back 66

Positive displacement

Front 67

What is the primary use of a turbine meter?

Back 67

Monitor device for large flow volume

Front 68

Why do water meters have to be electrically grounded?

Back 68

To prevent injury to workers

Front 69

How far must any meter be from entrance ,wall or grade wall?

Back 69

12”

Front 70

For a 5/8” water meter, how much space is required between adapters ?

Back 70

12”

Front 71

What is installed on domestic water lines to prevent condensation?

Back 71

Insulation

Front 72

Provisions shall be made to protect the water distribution system from the adverse effects of _______ _______

Back 72

Water Hammer

Front 73

Water distribution system must be capable of meeting _______ demands.

Back 73

Peak

Front 74

What two methods can be used to maintain temperature in a hot water line that is longer than 30m

Back 74

Recirculation

Heat trace

Front 75

A newly installed part of a potable water distribution system shall be _________ before the system is put into operation.

Back 75

Cleaned

Front 76

List 4 main components of a urinal flush tank

Back 76

Isolation valve

Fill valve

Siphon

Discharge piping

Front 77

Which of the four main components of an automatic urinal flush tank controls the frequency of the flush?

Back 77

Fill valve

Front 78

Which valve family does the fill valve belong to?

Back 78

Needle valve

Front 79

3 common trap primers

Back 79

Flush valve

Inline

Pressure drop

Front 80

An online automatic trap delivers a spurt of water when:

Back 80

The faucet opens and closes

Front 81

Why are atmospheric ports on the discharge of an inline trap primer not considered to be an approved air Gap?

Back 81

Openings are not the minimum 1”

Front 82

Blended water controls are also called ______valves or ______valves.

Back 82

Mixing

Tempering

Front 83

The maximum allowable temperature of water to be delivered from a mixing valve is _____•F, but a temperature of ____•F is recommended

Back 83

120•F

100•F