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Gas Piping & Heating Theory > Ch. 5 Quiz > Flashcards

Ch. 5 Quiz Flashcards

1
Q

propane tank must be __ft. away from a source of ignition

A

10ft.

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2
Q

propane tank must be __ft. away from an air intake

A

10ft.

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3
Q

propane tank must be __ft. from an opening of a building

A

5ft.

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4
Q

1st stage regulator is responsible for… (LP)

A

variance in tank pressure

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5
Q

inlet pressure of 1st stage regulator (LP)

A

20 - 80 psi

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6
Q

outlet pressure of 1st stage regulator (LP)

A

10 psi

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7
Q

2nd stage regulator is responsible for… (LP)

A

variance in down stream pressure

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8
Q

inlet pressure of 2nd stage regulator (LP)

A

10 psi

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9
Q

outlet pressure of 2nd stage regulator (LP)

A

11 - 14” w.c

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10
Q

max lockup pressure

A

120% of the 2nd stage regulator’s outlet pressure

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11
Q

bounce of 2nd stage regulator can be up to..

A

1” of w.c (.5 up or .5 down)

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12
Q

the allowable pressure drop for 2nd stage regulator

A

.5” w.c

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13
Q

pressure available @ appliance

A

No more than .5” w.c less than 2nd stage outlet’s pressure

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14
Q

What code covers first and second stage regulators (LP)

A

NFPA 58

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15
Q

NFPA 58 states what about single stage regulation

A

single stage regulation shall not be installed in fixed piping systems

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16
Q

what is required when the supply pressure is higher than what the appliance is designed for

A

Vent Limiter ( line gas pressure regulator)

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17
Q

inlet of 1st stage regulator pressure

A

usually 20 - 80 but less than 312 psi

18
Q

rubber diaphragm in a regulator senses..

A

gas pressure

19
Q

the lever actuator and seat disk do what…

A

meter the amount of gas

20
Q

what does the spring in a regulator do..

A

controls the flow of gas

21
Q

foreign material between inlet nozzle and seat disk causes …

A

no lockup and creeping (lg rise over 5 min)

22
Q

a relief valve is required on..

A

final stage gas regulators

23
Q

what does the vent of the final stage regulator do

A

vents excessive gas pressure

24
Q

obstruction of regulator vent causes what?

A

prevention of excessive pressure relief and prevention of diaphragm

25
Q

regulator vents shall prevent what

A 
water from entering (face down)
insects (screen)
foreign materials (paint)
26
Q

regulator vent shall terminate __ft from source of ignition (LP)

A

5’

27
Q

regulator vent shall terminate __ft from source of ignition (NAT)

A

4’

28
Q

when terminating a reg vent from indoors to outdoors vent must terminal how?

A

90 degrees vent down with screen installed

29
Q

gas meters must be readily accessible for…

A

examination
reading
replacement
maintenance

30
Q

gas meters must be identified by..

A

metal tag or other perm. means of designating the building or part of building it supplies

31
Q

3 factors that determine how much a customer should be billed

A

heat content - (sgs knows the blend)
inlet pressure - (meter adjusted at install)
temperature - (meter/sgs adjust meter for temp)

32
Q

meter set (meter & reg combo) located __ ft from opening

A

at least 3’

33
Q

what shall not be used in gas piping systems

A

cast iron

34
Q

what kind of black iron shall be used

A

min. sched 40

35
Q

when will plastic tubing be used..

A

outside underground only

36
Q

pvc used on outdoors regulator vents shall be what

A

UV resistant (electricians PVC)

37
Q

when metallic piping is used outdoors what must be done?

A

protected usually paint

38
Q

what kinds of teflon tape can be used as a thread joint compound?

A

blue monster or other approved material (UL listed)

39
Q

Four acceptable means of joining metallic pipe

A

Threaded
Flanged
Brazed (excess of 1,000)
Welded

40
Q

largest size pipe that can be threaded without approval from ahj is..

A

4 inches

41
Q

When pipe is over 4 inches the two methods of joining are

A

Flanged and welded

Gas Piping & Heating Theory (6 decks)

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