Ch. 5 Quiz

Question 1

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

Answer 1

10ft.

Question 2

propane tank must be __ft. away from an air intake

Answer 2

10ft.

Question 3

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

Answer 3

5ft.

Question 4

1st stage regulator is responsible for… (LP)

Answer 4

variance in tank pressure

Question 5

inlet pressure of 1st stage regulator (LP)

Answer 5

20 - 80 psi

Question 6

outlet pressure of 1st stage regulator (LP)

Answer 6

10 psi

Question 7

2nd stage regulator is responsible for… (LP)

Answer 7

variance in down stream pressure

Question 8

inlet pressure of 2nd stage regulator (LP)

Answer 8

10 psi

Question 9

outlet pressure of 2nd stage regulator (LP)

Answer 9

11 - 14” w.c

Question 10

max lockup pressure

Answer 10

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

Question 11

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

Answer 11

1” of w.c (.5 up or .5 down)

Question 12

the allowable pressure drop for 2nd stage regulator

Answer 12

.5” w.c

Question 13

pressure available @ appliance

Answer 13

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

Question 14

What code covers first and second stage regulators (LP)

Answer 14

NFPA 58

Question 15

NFPA 58 states what about single stage regulation

Answer 15

single stage regulation shall not be installed in fixed piping systems

Question 16

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

Answer 16

Vent Limiter ( line gas pressure regulator)

Question 17

inlet of 1st stage regulator pressure

Answer 17

usually 20 - 80 but less than 312 psi

Question 18

rubber diaphragm in a regulator senses..

Answer 18

gas pressure

Question 19

the lever actuator and seat disk do what…

Answer 19

meter the amount of gas

Question 20

what does the spring in a regulator do..

Answer 20

controls the flow of gas

Question 21

foreign material between inlet nozzle and seat disk causes …

Answer 21

no lockup and creeping (lg rise over 5 min)

Question 22

a relief valve is required on..

Answer 22

final stage gas regulators

Question 23

what does the vent of the final stage regulator do

Answer 23

vents excessive gas pressure

Question 24

obstruction of regulator vent causes what?

Answer 24

prevention of excessive pressure relief and prevention of diaphragm

Question 25

regulator vents shall prevent what

Answer 25

``` water from entering (face down) insects (screen) foreign materials (paint) ```

Question 26

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

Answer 26

5'

Question 27

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

Answer 27

4'

Question 28

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

Answer 28

90 degrees vent down with screen installed

Question 29

gas meters must be readily accessible for...

Answer 29

examination reading replacement maintenance

Question 30

gas meters must be identified by..

Answer 30

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

Question 31

3 factors that determine how much a customer should be billed

Answer 31

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

Question 32

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

Answer 32

at least 3’

Question 33

what shall not be used in gas piping systems

Answer 33

cast iron

Question 34

what kind of black iron shall be used

Answer 34

min. sched 40

Question 35

when will plastic tubing be used..

Answer 35

outside underground only

Question 36

pvc used on outdoors regulator vents shall be what

Answer 36

UV resistant (electricians PVC)

Question 37

when metallic piping is used outdoors what must be done?

Answer 37

protected usually paint

Question 38

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

Answer 38

blue monster or other approved material (UL listed)

Question 39

Four acceptable means of joining metallic pipe

Answer 39

Threaded Flanged Brazed (excess of 1,000) Welded

Question 40

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

Answer 40

4 inches

Question 41

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

Answer 41

Flanged and welded