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Plumbing/Gasfitting Period 2 (CND) > Plumbing Theory Period 2 (CND) > Flashcards

Plumbing Theory Period 2 (CND) Flashcards

1
Q

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

A

To supply hot water to the furthest fixture immediately.

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2
Q

If you were to rough in a bank of water closets, could you have one shut-off valve to serve the bank?

A

No, one valve is required per water closet.

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3
Q

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

A

They must be of the anti-siphon type.

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4
Q

What methods are used to drain the water in the distribution lines in an unheated building?

A

Slope the lines to a drain or blow out the lines.

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5
Q

Installing a check valve on a water service near the house shut-off valve, creates a?

A

Closed water system.

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6
Q

The only time you can inter connect public and private water system is ?

A

Never, it cannot ever be done.

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7
Q

When testing water distribution systems, the test will be an?

A

Air test at 100 psi for 2 hours.

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8
Q

The maximum pressure at the fixture in a water distribution system is?

A

550 KPag

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9
Q

A pressure reducing valve is needed when?

A

The pressure exceeds 550 KPag.

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10
Q

The higher the pressure in a water distribution system?

A

The noisier the flow.

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11
Q

Water meters are used for?

A

Metering water consumption, detecting leaks in the system, metering certain fixtures and billing purposes.

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12
Q

A meter bypass must be installed in the meter is?

A

Larger than 1-1/4”

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13
Q

What is the smallest size of service pipe allowed?

A

3/4”

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14
Q

What is the requirement for size when servicing more than one fixture with the water heater?

A

3/4”

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15
Q

What are the 3 requirements for using the simplified method of water sizing?

A
  • Separate water services
  • The total developed length of this water system measured from the most or furthest fixture to the property line is not more than 90m.
  • The minimum static pressure at the water service entry, usually the building isolation valve is not less that 200kpa.
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16
Q

The information needed for sizing water distribution system is?

A

Pressure at the building isolation, distance from the main to the farthest faucet.

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17
Q

The pressure at the curb cock will not be the actual pressure used for sizing because?

A

The minimum pressure at the building isolation must be atleast 200kpa.

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18
Q

When sizing the water service, you will?

A

Size is according to the total cold fixture units.

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19
Q

Residential instantaneous water heaters are designed for?

A

Low flow rates.

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20
Q

In gas fired hot water tank, the largest volume of hot water is located?

A

At the top due to the density factor.

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21
Q

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

A

150 psi

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22
Q

The electric hot water tank has?

A

An anode rod since it may be exposed to corrosive water.

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23
Q

Hot water tanks are sized according to the?

A

Number of building occupants

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24
Q

The lowest opening in a hot water tank is for?

A

Drain valve

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25
Q

The hot water tank dip tube is?

A

For directing the cold water down to the bottom of the tank.

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26
Q

The maximum temperature allowed in a hot water tank is?

A

210F or 99C

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27
Q

The discharge pipe on a temp. and pressure relief valve must drop down to within ______ of the floor.

A

12” or 300mm

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28
Q

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

A

A temperature relief valve.

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29
Q

A vacuum breaker on a bottom feed hot water tank Replaces?

A

The small hole drilled in the dip tube.

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30
Q

An indirect service hot water tank is usually heated by?

A

Hot water.

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31
Q

Upon entering an occupants home to unplug a floor drain, you notice that a cap has been placed on the hot water tank temperature and pressure relief valve, so you?

A

Inform the owner of the risk and ask to repair it

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32
Q

After completing an installation of a complete water distribution system you?

A

Flush all the lines, including the clothes washer and dishwasher lines.

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33
Q

Dual venting is a method of venting in which _______ trap seal(s) is/are protected by means of _______ vent pipe(s).

A

2 trap seals, 1 vent pipe.

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34
Q

Name 3 fittings that may be used for dual venting.

A

Double tee wye
Double wye
Side inlet tee wye (Bungalow fitting)

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35
Q

The waste pipes of dual-vented fixtures must connect at?

A

The same level.

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36
Q

The number of dual vents required for 16 similar fixtures is?

A

8.

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37
Q

True or False: Where dual venting is employed, the fixtures must be identical

A

False; The connection of the trap arms t the branch must be at the same elevation.

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38
Q

A flat vent is used when the vent must run _______ and _______ the flood level rim of that fixture.

A

Horizontal and Below

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39
Q

Two fixtures that use the flat vent are the ________ and the _______.

A

Kitchen sink and Bathtub.

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40
Q

When a flat vent is installed it must be equipped with a _______.

A

Cleanout.

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41
Q

The flat vent is sized as an ________ or _________ vent.

A

Individual or Dry vent.

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42
Q

The table that is used to size a flat vent is?

A

Table 2.5.7.1

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43
Q

A flat vent should change to the ______ position as soon as possible.

A

Vertical

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44
Q

True or False: There limitations on distance when using Table 2.5.7.1?

A

False

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45
Q

The correct term for a vertical rainwater pipe located inside a building is a?

A

Rainwater leader.

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46
Q

2 acceptable terms for rainwater pipes located outside a building are ________ and _________.

A

downspouts and rainwater leaders.

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47
Q

List 5 pipe materials that are acceptable for both above ground sanitary drainage and rainwater leaders.

A

ABS, PVC, CI, DWV Copper & Galvanized steel pipe.

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48
Q

Another name for an underground drainage system is?

A

Subsoil drainage

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49
Q

Weeping tile water preferably goes to the _______ instead of to the ________ sewer.

A

SOTRM SEWER instead of to the SANITARY sewer.

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50
Q

Name 5 methods for disposing of subsoil drainage.

A

Storm sewer, Combined sewer, Sanitary sewer, Sump pit, and Above ground (*on a splash pad, directed to a drainage ditch, directed to a catch basin)

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51
Q

When the weeping tile is to be connected to the sanitary building drain, a ________ and a _______ must be installed.

A

BACKWATER VALVE and a P TRAP must be installed.

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52
Q

A wet vent pipe acts as a/an _____ pipe and also as a/an ______ pipe.

A

WASTE pipe and also as a VENT pipe.

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53
Q

2 or more fixtures can be involved in a wet venting arrangement. When 3 or more fixtures are involved, the top fixture is considered t be __________ vented and the balance of the fixture in the group are considered to be _________ vented.

A

Dry Vented and Wet Vented

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54
Q

The primary purpose of wet venting is for?

A

Economy of piping.

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55
Q

A wet vent starts ________ of the first or highest connected fixture on a common vertical pipe.

A

Downstream

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56
Q

Yes or No: Do the fixtures involved in a wet venting arrangement need to be located on the same floor level?

A

No

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57
Q

The minimum size of a continuous vent is ?

A

1-1/4”

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58
Q

How is a wet vent sized?

A

Full size throughout.

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59
Q

Continuous vents are sized from table _______ and then cross referenced to table ______.

A

Table 2.5.8.3 and cross referenced to Table 2.5.7.1

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60
Q

The combined wastes from a lavatory and single compartment sink are used to wet vet a 3” water closet. The wet vent size should be ?

A

2”

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61
Q

The slope on a horizontal wet-vented waste pipe, 3” in size or smaller, is a minimum of?

A

1:50 or 1/4” per foot or 2%

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62
Q

When sizing the waste or soil pipe section between fixtures, using common vent, the pipe is classified as a/an ________ vent and is sized from table _____

A

An WET vent and sized from TABLE 2.5.8.1

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63
Q

When sizing the vertical portion of the wet vent, do not include the fixture unit load of the _______ connected fixture.

A

the LOWEST

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64
Q

To size a continuous vent, you must first determine the size of the vent according to table ______, then based on the largest trap size in the system, ensure that table _____ has been satisfied.

A

Table 2.5.8.3 and Table 2.5.7.1

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65
Q

The lowest connection on a vertical single story wet vent is?

A

Water Closet

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66
Q

Table 2.5.7.1 is used to size ?

A

All Vents.

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67
Q

A vent pipe that is used in conjunction with a circuit vent to provide additional air circulation between a drainage system is called a?

A

Relief Vent

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68
Q

A circuit vented branch is defined as the drainage piping between the ?

A

Relief vent and circuit vent.

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69
Q

A circuit vent connects to ?

A

The trap arm of the most upstream fixture

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70
Q

What is the maximum number of water closets that may drain into a circuit vented branch?

A

There is no maximum.

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71
Q

Where are circuit vented systems allowed to be installed?

A

Residential, Commercial, and High rise apartment buildings.

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72
Q

How are wet venting and circuit venting systems similar?

A

Both systems use the upper portion of a horizontal drainage pipe for venting multiple fixtures.

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73
Q

Is it permissible to drain 1-1/2” trap arms into a circuit vented branch that also serves 2” trap arms?

A

Yes, but only if the 1-1/2” trap arms are separately vented.

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74
Q

What is the maximum hydraulic load permitted to drain into a relief vent?

A

6 fixture units

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75
Q

What is the maximum hydraulic load permitted to drain into a circuit vent?

A

3 fixture units

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76
Q

What is the minimum size permitted for a circuit vented branch that serves 2” trap arms?

A

3”

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77
Q

What is the minimum size permitted for a circuit vented branch that serves only 1-1/4” trap arms?

A

2”

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78
Q

Which table is the National Plumbing Code is used to size a circuit vented branch?

A

Table 2.4.10.6B

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79
Q

What is the minimum size of a relief vent for a circuit vented branch that serves water closets?

A

1-1/2”

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80
Q

What is the minimum size of the wet portion of a circuit vent that has one lavatory draining into it, if the circuit vented branch serves water closet?

A

2”

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81
Q

Which Table in the National Plumbing Code is used to size circuit vents?

A

Table 2.5.8.3

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82
Q

When installing a relief vent on the horizontal portion of a circuit vented branch which of the following would be the best procedure?

A

Using a wye fitting with the outlet rolled above the horizontal centre line of the circuit vented branch.

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83
Q

Which article in the National Plumbing Code describes the requirements for circuit venting?

A

Article 2.5.3.1

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84
Q

Which article in the National Plumbing Code describes the restrictions on draining fixture into the circuit vent?

A

Article 2.5.4.5

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85
Q

Piping should be installed so their markings are __________ and ___________.

A

Facing up when installed in a trench and facing down when hung on hangers.

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86
Q

When installing pipe underground, the ditch should be _________________.

A

Smooth and without any high spots.

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87
Q

When placing any pipes under or through a foundation you should prevent the foundation from ____________.

A

Bearing any weight on the pipe.

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88
Q

When back filling a trench the first _______ mm should be done by hand using small compatible aggregate.

A

300mm

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89
Q

Can you use a sanitary tee on its back to connect on fixture drain to another?

A

No; A sanitary tee on its back can only be used to connect a dry vent.

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90
Q

Can you purchase a 2” expansion joint?

A

Yes; Expansion joints are manufactured in sizes 1-1/2” through 4”.

91
Q

Does ABS pipe expand more than PVC pipe?

A

Yes,

92
Q

The maximum trap arm length of a minimum size floor drain is ?

A

2.4m or 8ft

93
Q

The size of a cleanout is determined by the size of the _________ but does not need to be any larger than ____ for pipes over 4”.

A

Drainage pipe, 4”

94
Q

If you have a 4” building drain connected to a 3” soil stack, what would the size of the cleanout at the base of the stack be?

A

4”

95
Q

When you are uncertain if a bathtub trap will be accessible or not, what would be the solution?

A

Make the P-trap a solid joint style.

96
Q

What is the cheapest method of venting?

A

Stack vent is the most economical method. This wet vent method allows for one vent to serve many fixtures.

97
Q

Yes or No: Can you have two basins tied together by continuous waste system?

A

Yes; The can be 2 single sinks or basins on one trap using the continuous waste method.

98
Q

Can you have an 1-1/4” waste branch?

A

Yes; Table 2.4.10.6.B

99
Q

A wet vent will be sized according to what table?

A

Table 2.5.2.1

100
Q

If a fixture is not listed on Table 2.4.9.3, the size of the trap will determine it fixture units by using table?

A

Table 2.4.10.2.

101
Q

According t the NPC, to size a building drain, you must know the _________ and the __________.

A

The total fixture units and The amount of grade on the pipe.

102
Q

According to Table 2.4.9.3, the smallest P trap is ___ inch for one shower head.

A

1-1/2”

103
Q

How do you size a continuous vent?

A

Number of fixture units venting into it.

104
Q

How do you decide the size of the trap arm?

A

By either Table 2.4.9.3 or according to its fixture outlet pipe.

105
Q

Why is a material list so important for a job?

A

A list assists in tracking materials that are used or required on a particular job.

106
Q

Yes or No: Does a plumbing vent that is installed above the flood level rim of a fixture need to be leak tested?

A

Yes; The NPC says all DWV systems need to be tested for leaks.

107
Q

What is the minimum time required for a leak test using water?

A

15 minutes

108
Q

When pressure testing a drainage system, what is the tool needed to hold the pressure in the piping being tested?

A

A test plug.

109
Q

Grinds food to a pulp stage so that it is small enough to flow down the drain with the assistance of cold water?

A

Garbage grinder

110
Q

Prevents blocked drains by not allowing soap bars and other large objects to enter the drain.

A

A shower strainer.

111
Q

Provides janitors with a place to fil and empty floor washing pails.

A

Service sink.

112
Q

A residential garbage grinder has ___ load when connected to a kitchen sink.

A

No load.

113
Q

When a dishwasher is not located near the kitchen sink, the drain will have to be?

A

Individually supplied and installed complete with a P-trap, and it will by protected by a vent.

114
Q

What table is used to find a fixture unit rating for an automatic clothes washer?

A

Table 2.4.9.3

115
Q

The minimum size of a P-trap for a service sink is ?

A

2”

116
Q

The difference between a service sink and mop sink is?

A

A service sink is wall mounted and a mop sink is floor mounted.

117
Q

What is the minimum size of a P trap for a residential shower?

A

1-1/2”

118
Q

What is the minimum size of water supply required for a dishwasher?

A

1/2”

119
Q

Garbage grinder knives are made from?

A

Steel or stainless steel.

120
Q

What additional fixture should be supplied with clothes washers?

A

A floor drain

121
Q

Service sinks are generally made from?

A

cast iron

122
Q

Prebuilt showers have a __________ membrane.

A

Built-in waterproof membrane.

123
Q

2 common shower membrane materials.

A

PVC liner and Lead sheeting.

124
Q

2 names of garbage grinders?

A

Batch feed grinder and Continuous feed grinder

125
Q

Which is the safest grinder to operate?

A

Batch feed grinder

126
Q

Should hot or cold water flow through a garbage grinder when in operation?

A

Cold water should be ran through the grinder. But hot water breaks down the grease and allows it to cling to the pipe.

127
Q

On a batch feed grinder the control switch is located?

A

Internally.

128
Q

When installing a garbage grinder, the mounting ring has three screws that are meant for?

A

Drawing the flange snug to the base of the sink.

129
Q

When placing the flange of the grinder onto the sink, you should place it so the?

A

Writing or symbols face up to the person looking at it.

130
Q

Can you test the drain for leaks even if the power is not connected to the grinder?

A

Yes.

131
Q

What is the minimum size for a residential laundry stand pipe?

A

2”

132
Q

Before installing any fixture, the first step is to?

A

Open the box and check to see if all the parts and manuals are there.

133
Q

Before installing any fixture you must refer to the?

A

Manufacturers rough in book.

134
Q

To hold up a service sink a _______ is supplied.

A

Support bracket

135
Q

The height of a service faucet, from centre of the faucet to the floor is?

A

30”

136
Q

Mop sinks should have an opening in the floor for the fixture outlet of at least?

A

6” in diameter.

137
Q

What is the height of a shower head from the floor?

A

6’6” from the floor to the centre.

138
Q

What size of P trap does a residential garbage grinder require?

A

1-1/2”

139
Q

If a dishwasher were to have its own trap it would be?

A

1-1/2” in size.

140
Q

With the water supply tubing connecting the dishwasher, what 2 other components are required?

A

Isolation valve and Adapter to the solenoid valve.

141
Q

Why must laundry water supplies have shutoff valves?

A

So servicing of the appliance can be done easily.

142
Q

Where should the hole for the dishwasher drain hose be located in the cabinet?

A

It should be located as high as possible in the cabinet.

143
Q

What is the hydraulic load of a dishwasher connected to a garbage grinder?

A

Zero fixture units .

144
Q

Why must you make a high loop on the dishwasher drain hose?

A

This prevents waste from backing up into the dishwasher.

145
Q

2 methods for trapping a garbage grinder?

A

it could be connected to the adjoining sink with the means of a continuous waste.
or
It may have its own trap and trap arm to the waste connection.

146
Q

What is the hydraulic load of a commercial garbage grinder that has its own 2” P trap and what table did this info. come from?

A

Hydraulic load - 3 fixture units

and, Table 2.4.9.3

147
Q

The size of the individual vent to be installed on a fixture drain to a garbage grinder is ___ inched, which is found in table_____.

A

1-1/4” and Table 2.5.7.1.

148
Q

A triple compartment sink will need a minimum of a ?

A

2” P trap.

149
Q

Before troubleshooting a garbage grinder, ensure that the?

A

Power is turned off.

150
Q

With the electrical brought to the dishwasher location what is the first step in installing this appliance?

A

Ensure that the panel switch is off for the dishwasher.

151
Q

Yes or No: With the dishwasher in place and water and sewer connected, are you permitted to connect the electrical to the unit?

A

No; You need a qualified electrician to connect it.

152
Q

Before installing a used fixture is must be ?

A

Inspected to meet todays standards.

153
Q

What is the minimum water supply pressure to a fixture?

A

50 kpa or 7 psi

154
Q

What is the maximum water supply pressure to a fixture?

A

550 kpa or 80 psi

155
Q

Why are concealed overflows NOT permitted on kitchen sinks?

A

I prevents fungus and bacteria build up in the overflows.

156
Q

What has t be done before a two piece ball valve can be serviced?

A

Remove the valve from the piping to take apart.

157
Q

What identification must a ball valve use in natural gas service?

A

It must be stamped by an approved testing agency.

158
Q

What is the direction of flow through a conventional disc globe valve?

A

Flow should be from under the seat.

159
Q

What is the advantage of having a OS and Y gate valve on a fire service?

A

East to see if the valve is open.

160
Q

What kind of check valve should be used for a low velocity heating system that uses ball valves for isolation?

A

Swing Check Valve.

161
Q

What are 2 advantages of composition disc globe valves?

A

Higher resistance to erosion and Positive seal when particles accumulate on the seat.

162
Q

Where would you locate a firing valve?

A

gas train to large appliances.

163
Q

What kind of end connections will you find on a corporation main stop?

A

AWWA Thread on one end and either a flare or compression on the other.

164
Q

4 factors that should be considered when choosing the correct valve for an installation?

A

Pressure, Temperature, Volume and Type of Fluid

165
Q

State the purpose of the Stuffing Box?

A

To prevent fluid leakage

166
Q

State the purpose of the Packing Nut?

A

To hold the packing which prevents fluid leakage

167
Q

State the purpose of the Packing Gland?

A

To compress the packing

168
Q

State the purpose of the Lantern Ring?

A

To lubricate the valve stem

169
Q

When would you choose a globe valve instead of a gate valve?

A

Any time a throttling application of flow control is required.

170
Q

What is the recommended position that a valve stem should be installed?

A

Upright vertical position

171
Q

The loss of pressure in the line caused by the valve or fitting in relationship to a length of pipe is ?

A

Equivalent length

172
Q

The difference between the restriction (relative to the equivalent length of pipe) of a 3/4” gate valve fully open and a 3/4” globe valve fully open is?

A

19.5ft

173
Q

The difference between a 2” gate and globe fully open is?

A

53.7ft

174
Q

The meaning of NRS?

A

Non-rising stem

175
Q

The meaning of AWWA?

A

American Water Works Association

176
Q

The meaning of RS?

A

Rising stem

177
Q

The meaning of WOG?

A

Water, Oil and Gas

178
Q

The meaning of S ?

A

Steam

179
Q

The meaning of 125WOG ?

A

125 psi max. operating pressure (Water, Oil and Gas)

180
Q

The meaning of 125S?

A

125 psi max. operating pressure (Steam)

181
Q

The meaning of CGA?

A

Canadian Gas Association

182
Q

What types and designs of valves would be best suited for Laminar flow, Non throttled?

A

Ball or Gate valve

183
Q

What types and designs of valves would be best suited for Very close throttling?

A

Needle Valve

184
Q

What types and designs of valves would be best suited for Restricted headroom-non throttling?

A

Ball or Non-rising stem gate valve

185
Q

What types and designs of valves would be best suited for Change direction and throttle?

A

Angle globe valve

186
Q

A 1” steam boiler blow down valve is required to manually remove sludge and sediment on a daily basis. Which valve type and/or designs would be used?

A

Quick opening gate valve and Y pattern globe valve.

187
Q

A check valve is required downstream of a domestic cold water booster pump that cycles frequently. All piping is 3” flanged and uses butterfly valves for isolation. Which valve type and/or designs would be used?

A

Non-Slam check valve

188
Q

Isolation valves are required on domestic hot and cold 3/4” branch piping to individual hotel suites. Which valve type and/or designs would be used?

A

Solid wedge gate valve or ball valve.

189
Q

Automatically controlled balancing of flow is required on a bank of 3 heating coils in a ventilation plenum. All piping is 3” and flanged. Which valve type and/or designs would be used?

A

Lug wafer butterfly valve with actuator

190
Q

A throttle type supply valve is required for an old style cast iron hot water heater. Supply piping 3/4” comes up through the floor and there is no room for 90 degree elbows. Which valve type and/or designs would be used?

A

Angle globe valve

191
Q

All zones for fin tube radiation is a high rise office building require a balancing valve for the return. Pressure drop is not an issue. Which valve type and/or designs would be used?

A

Lock shield straight pattern globe valve.

192
Q

A 2” low velocity line with suspended particles requires a horizontally mounted check valve that provides positive shut off. Which valve type and/or designs would be used?

A

Lift check valve with composition disc

193
Q

Several fan coil units require compact isolation valves for 1/2” hot water heating supply and return valves. there is limited area within the fan coil hook up compartment. Which valve type and/or designs would be used?

A

Ball valve

194
Q

A check valve is required downstream of a continuously running circulation pump in a mechanical room. This is a 4” high volume heating supply line and noise is not a consideration. Which valve type and/or designs would be used?

A

Lift check valve with metal to metal disc and seat or a swing check valve.

195
Q

A frequently used 3” isolation valve on a line that contains suspended debris requires dependable and positive shut off. Which valve type and/or designs would be used?

A

Split wedge gate valve

196
Q

Multiple lines in a food processing plant require 1” and 2” manually operated regulating valves. Which valve type and/or designs would be used?

A

Diaphragm valve

197
Q

A 2” threaded supply line in a steam system that is subject to extreme temperature changes requires an isolation valve. Which valve type and/or designs would be used?

A

Flexible wedge gate valve

198
Q

A 3/4” natural gas line drop to a furnace requires an appliance shut off. Which valve type and/or designs would be used?

A

CGA approved ball valve or gas cock

199
Q

A 1/4” compressed air line requires a constant, consistent ,accurate and fine-tuned air flow to a delicate dental drill apparatus. Which valve type and/or designs would be used?

A

Needle valve

200
Q

A bank of natural gas meters with 1-1/4” outlets, require separate isolation valves to several individual row housing units. Which valve type and/or designs would be used?

A

Lockable gas valve

201
Q

A 1” high density polyethylene gas service to a single family dwelling that changes from plastic to black malleable iron above grade requires a shut off. Which valve type and/or designs would be used?

A

Insulated service valve.

202
Q

A 1-1/4” throttling type valve is required in a process waste line that contains suspended scale and debris. Which valve type and/or designs would be used?

A

Straight pattern globe with conventional disc

203
Q

Preset temperatures on a hot water tank?

A

140 degrees F

204
Q

Dip tube ?

A

It’s a tube that pushed cold water from the top of the tank to the bottom

205
Q

Electric hot water tanks require 120v or __v power supply?

A

240volts

206
Q

Storage tanks are _______ centre flue type tank.

A

Concave

207
Q

The side of a storage tank has three openings the top opening is within 6” off the top of the tank this is for the ?
The other two opening are ?

A

Pressure relief valve.

Gas control and drain valve

208
Q

The anode rode is typically known as ?

A

Sacrificial anode

209
Q

Dip tube is called ?

A

Anti siphon hole

210
Q

A temperate relief vales pop at what temp to reduce tank ?

A

99degrees c or 210 degrees f

211
Q

The most common domestic gas fired hot water tanks are ?

A

30 us gallons 40 us gallons and 50 us gallons.

212
Q

A 40 gallon hot water tank gas fired has a voltage of ?

A

120-240volts

213
Q

The pressure should be located so that the pressure in the tank does not exceed the pressure of the relief valve by ?

A

35kpa or 5 psi

214
Q

At the bottom of a drop for a temp relief valve on a hot water tank the air break need to more no more then?

A

12” or 300mm off the floor

215
Q

Cut drop piece of copper on a temp relief valve at a ?

A

45 degree angle

216
Q

What’s frost heave ?

A

When there’s no wheeping tile installed causing the ground to be soaked and when the water freezes it expands agains your foundation cracking it.

217
Q

A combined sewer is ??

A

No longer allowed !

218
Q

Every rainwater leader needs what ?

A

P trap and a back water valve

219
Q

Ever rain water leader needs to be no more than ?

A

3 meters upstream from the bottom of the leader

220
Q

Another name for wheeping tile ?

A

Subsoil drainage

221
Q

First storey does. It exceed ___ fixture units

A

4

222
Q

The offset does not exceed ___m for pipes 2 inches or less in size?

A

1.2M

223
Q

The offset does not exceed ___m for pipes larger then 2 inches in size.

A

2.5m

224
Q

The length of a wet vent is limited true or false

A

False it can run as far as you want !

Plumbing/Gasfitting Period 2 (CND) (7 decks)

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