Plumbing Code and Isometrics

Question 0

Maximum static water pressure allowed for water distribution system? (40, 60, 80, 100 PSI)

Answer 0

80 PSI

Question 1

Plumbing isometric diagram of two bay gas station. What is the size of drain line “I”?

Answer 1

3”

Question 2

Given: 200 Lineal ft of 4” pipe at .75 cents per ft, 100’ Lineal Ft of 3” pipe at .55 cents per foot, and 75’ Lineal feet of 2” pipe at .25 cents per foot. If invoices is marked “2/10NET30”, what is the lowest cost of the PVC pipe?

Answer 2

$219.28

Question 3

What is required to be installed prior to rough-in inspection?

Answer 3

All parts and actions that can be installed prior to installations of fixtures.

Question 4

Minimum number of water closets for a dormitory with 200 females.

Answer 4

20

Question 5

Minimum waste outlet for a sink?

Answer 5

1-1/2”

Question 6

Minimum clearance for front of urinal?

Answer 6

21”

Question 7

Maximum water pressure for relief valve on hot water heater?

Answer 7

150 PSI

Question 8

Minimum distance from grade for F.D.C. (12, 18, 24, 36)

Answer 8

18”

NFPA 13

Question 9

Which cannot be used in a building water distribution system?

Answer 9

PVC

Question 10

Water system must be able to supply hot water to fixtures at least _____ Ft.

Answer 10

100 Ft

Question 11

Critical level of atmospheric vacuum breaker must be a minimum ____” above flood level rim.

Answer 11

6”

Question 12

What size of main drain is required for a 6” riser? (3/4, 1-1/4, 1-1/2 OR 2”)

Answer 12

2”

Question 13

Single sanitary tees may be used in vertical drain lines only where direction of flow is horizontal to _____________.

Answer 13

vertical

Question 14

A clean out at junctions of building drain and building sewer is not required if the clean out on a 3” or larger soil stacks if located with in a developed length of _______ feet.

Answer 14

10 Feet

Question 15

Total DFU’s for 7 bathroom groups at 1.6 flush, clothes washer, 3 kitchen sinks, 2 lavatorys, 2 water closets at 1.6 flush. (51, 53, 58 and 59)

Answer 15

51

Question 16

Pipe schedule indicates what?

Answer 16

Wall thickness

Question 17

What is needed in a potable water line that delivers make up water to a hydronic boiler? Atmospheric ______-_______ __________________

Answer 17

Atmospheric back flow preventer

Question 18

What is the minimum size trap for a sink?

Answer 18

1 1/2”

Question 19

Minimum air gap for backflow preventer protecting sink with effective opening of 3/4”?

Answer 19

2-1/2”

Question 20

Vent inlet vent for soil or waste pipe shall not be below the _____ of the trap.

Answer 20

The weir of the trap

Question 21

Vent terminals may terminate within 10’ of window if it’s at least ____” above the top of the opening.

Answer 21

2”

Question 22

Minimum size of wet vent for 3 DFU is…

Answer 22

2”

Question 23

The diameter of a relief valve serving stack or more than 10 branch intervals shall be at least ________ to the size of the vent stack to which it connects.

Answer 23

equal to

Question 24

Every fixture must have a water ______ _______.

Answer 24

water trap seal

Question 25

What is the minimum pipe size for an air admittance valve used to vent a 1-1/2 horizontal branch? (1-1/4", 1-1/2", 2" or 2-1/2")

Answer 25

1-1/2"

Question 26

What is the minimum size vent for 3" pipe with 45 DFU Load, and a developed length of 72'?

Answer 26

2-1/2"

Question 27

It is ok to have combination fixtures on one trap as long as outlets are not more than _____" apart.

Answer 27

30"

Question 28

Pipe hangers and strapping material shall be of approved material that will not promote _________ action.

Answer 28

galvanic action

Question 29

Water closets should be bolted to the floor with what kind of bolts?

Answer 29

Corrosion resistant bolts?

Question 30

Water service pipe and building sewer pipe shall be separated by a minimum of how many inches above the top of the highest point of the sewer?

Answer 30

12"

Question 31

Fixture supply shall not terminate more than how many inches from the point of connection to the fixture?

Answer 31

30"

Question 32

Wastewater when discharged into the building drainage system shall be at a temperature not higher than how many degrees?

Answer 32

140 degrees

Question 33

A public restroom had 6 public flush-o-meter tank water closets flushing at 1.6 gpf, 1 urinal and 5 lavatories. What is the DFU load?

Answer 33

33

Question 34

All indirect waste piping that exceeds how many feet in total developed length shall be trapped?

Answer 34

4'

Question 35

Fixture trap seals shall not be subjected to a pneumatic pressure differential of more than how many inches of water column?

Answer 35

1"

Question 36

Every building in which plumbing is installed shall have at least 1 stack of not less than _____ of the required size of the building drain?

Answer 36

1/2

Question 37

What wet vent pipe size in inches should be used for DFU (Drainage Fixture Units)? Hint: A wet vent is the vertical pvc pipe that connects below and directly to the sink p-trap

Answer 37

2"

Question 38

What is the diameter of a vent for a 3" stack with 45 fixture units that is 72" long? Hint: The stack pipe is a larger pipe going from roof to drain which is larger than the vent pipe under the sink.

Answer 38

2"

Question 39

A single sanitary tee may be used in vertical drain lines only when the direction of flow is horizontal to _____________. Hint: Think about PVC tee that has a curved offset in the middle. The tee is curved on the side instead of like a straight tee so that the drainage can run downward towards drain smoother.

Answer 39

vertical

Question 40

What type of valve shall not be used as a balancing valve? (Ball valve, Gate valve, Check valve, Globe valve)

Answer 40

Gate valve Remember: Gate valves have to be turned like a wheel. There main benefit it that they seal tightly in the closed and open position.

Question 41

Drawing of a 2 or 3 story residential plumbing system with fixtures attached: Question asks what is A?

Answer 41

Horizontal Branch Drain

Question 42

The maximum # of urinals on a 10FT wall is ____.

Answer 42

3

Question 43

7 Bathroom groups flushing at 1.6 Gal 1 Clothes washer, 3 Kitchen sinks 2 Lavatories and 2 water closets at 1.6 Gal (51, 53, 58, 59)

Answer 43

51

Question 44

What size is drain at capital I?

Answer 44

3"

Question 45

In plumbing subsoil drains, such drains shall not be less than ______" in diameter.

Answer 45

4"

Question 46

Where there is continuous water discharge into building storm drain or sewer, every gallon per minute of discharge shall be equivalent to 96 square feet of roof area, based on a rainfall rate of 1" per hour. 96GPM x 3 inch per hr of water = ______ square ft water coverage

Answer 46

288 Square Ft

Question 47

Regarding plumbing storm drains, scuppers shall not have an opening dimension of less than ______".

Answer 47

4"

Question 48

Roof drains shall have strainers extending not less than _____" above the surface of the roof adjacent to the roof line.

Answer 48

4"

Question 49

Regarding plumbing traps, interceptors and separators, a combination plumbing fixture is permitted to be installed on one trap, provided that one compartment is not more than _______" deeper than the other compartment and the waste outlets are not more than _______" apart.

Answer 49

6" deeper | 30" apart

Question 50

Regarding stack vents for plumbing, the air admittance shall be rated in accordance with the standard size of the vent to which the _______ is connected.

Answer 50

Valve

Question 51

Regarding plumbing vents, the size of the relief vent shall be equal to the size of the vent stack to which it connects. Example, 3" vent stack connects to a ____" relief vent.

Answer 51

3"

Question 52

Regarding plumbing vents, any roof used for tanning or where people reside shall have vents at least _____ Ft above the roof.

Answer 52

7 Ft

Question 53

The plumbing system shall be provided with a system of vent piping that will permit the admission or emission of air so that the seal of any fixture trap shall not be subjected to a pneumatic pressure differential of more than _____" water column.

Answer 53

1"

Question 54

Regarding indirect/special waste, the air gap between the indirect waste pipe and the flood level rim of the waste receptor shall be a min of ______ the effective opening of the indirect waste pipe.

Answer 54

Twice

Question 55

Regarding indirect/special waste, all indirect waste piping that exceeds 2 ft in developed length measured horizontally, or _____ft in total length shall be trapped.

Answer 55

4 Ft

Question 56

Regarding sewers, a ________ valve and full open valve located on the discharge side of the check valve shall be installed in the pump or ejector discharge piping between it and the gravity drainage system.

Answer 56

Check valve

Question 57

Regarding sanitary drainage, clean outs on 6" and smaller pipes shall be provided with a clearance of not less than ______".

Answer 57

18"

Question 58

The clean out at the junction of the building drain and building sewer shall not be required if the clean out on a 3" or larger soil stack is located within a developed length of _______Ft.

Answer 58

10 Ft

Question 59

For building sewers 8" and larger, _______________ shall be provided.

Answer 59

Manholes

Question 60

The minimum slope of a 3" horizontal drain shall be __/__" per ft.

Answer 60

1/8"

Question 61

A sanitary tee going from horizontal to vertical is _____.

Answer 61

Xc

Question 62

The potable supply to the boiler shall be equipped with a __________ ___________ with an intermediate atmospheric vent.

Answer 62

Back flow Preventer

Question 63

Regarding back flow prevention, the critical level of the vacuum breaker shall be set a min. of ______ inches above the flood level rim of the fixture.

Answer 63

6"

Question 64

In a back flow preventer, the pressure vacuum breaker assembly shall have a backsiphonage application size range of 1/2"- _____".

Answer 64

2"

Question 65

"Lead free" solder shall mean a chemical composition equal to or less than ___.___% lead.

Answer 65

0.2%

Question 66

All hot water distribution pipe and tubing shall have a min. pressure rating of ______ psi at 180F. CPVC should also equal 100psi.

Answer 66

100psi

Question 67

All water service pipe or tubing, installed underground and outside of the structure shall have a min. working pressure of _____PSI.

Answer 67

160 PSI

Question 68

The minimum pipe size for a water closet or flush tank should be ___/___".

Answer 68

3/8"

Question 69

The minimum size pipe size for a drinking fountain shall be ___/___".

Answer 69

3/8"

Question 70

The flow rate for delivering water to a shower is _____ GPM.

Answer 70

3 GPM

Question 71

The required capacity for distributing water to a bathtub, the flow pressure should be _____ PSI.

Answer 71

8 PSI

Question 72

If a sewer is a min ______" above the top of the highest point of the sewer, the minimum 5 feet of distance from a water service pipe doesn't apply.

Answer 72

12" above

Question 73

The minimum diameter of a water service pipe shall be __/__".

Answer 73

3/4"

Question 74

With regards to a relief valve, the max temp setting is _____F and a pressure setting not exceeding the tank or water heater manufactures rated working pressure of _____ PSI.

Answer 74

210 F | 150 PSI

Question 75

Water closets for public and employee toilet facilities shall be of the ____________ type.

Answer 75

Elongated

Question 76

Sinks shall be provided with a waste outlet a min of ___.___" in diameter.

Answer 76

1.5"

Question 77

The minimum distance between the outside toilet edge and closet wall is _______".

Answer 77

15"

Question 78

Floor flanges for water closets or similar fixtures shall not be less than ___.___ inch thick for brass.

Answer 78

0.125"

Question 79

A residential one and two family dwelling has a min requirement of ____ bath group, ____ kitchen sink and ____ clothes washer connection.

Answer 79

1 bath group 1 kitchen sink 1 clothes washer

Question 80

The number of water closets (urinals) needed for residential dormatory of 200 students is _____.

Answer 80

20 urinals. 1 for every 10 people 20x10= 200

Question 81

The number of lavatories for an educational building of 1100 male students and 1200 female students shall be ______.

Answer 81

46 total 1 lavatory for every 50 students 50 divided by 2300 = 46

Question 82

The number of urinals/toilets needed for places of worship that has 300 men and 300 women should be...

Answer 82

6 4 toilets for women 2 urinals for men

Question 83

In a drainage and vent final test, all traps shall be filled with ________ and a smoke machine filled in plumbing pipes until smoke appears at stack opening on the roof. Then the stack openings shall be closed and a pressure equivalent to _____ inch water column shall be held for a min test period of ______ minutes.

Answer 83

water | 15 minutes

Question 84

For drainage and water tests, an air test shall be made by forcing air into the system until there is a uniform pressure of ____PSI.

Answer 84

5 PSI

Question 85

The max. horizontal hanger spacing for steel pipe is _____Ft.

Answer 85

12 Ft

Question 86

The max. vertical hanger spacing for cast iron pipe is _____ ft.

Answer 86

15 ft