Piping

Question 1

How many inches water column equals 1 psig pressure

Answer 1

28

Question 2

what is the normal gas building supply pressure for a single family dwelling (Natural Gas)

Answer 2

7” wc

Question 3

what is the normal gas pressure for a single family dwelling (Propane)

Answer 3

11” wc

Question 4

what is the maximum natural gas or propane gas pressure allowed inside a one or 2 family dwelling

Answer 4

2 psig

Question 5

What is the maximum pressure allowed inside an industrial building

Answer 5

66 psi

Question 6

tubing installed in residential buildings must be supported every ______ ft

Answer 6

6ft

Question 7

the maximum gas pressure inside a commercial building is

Answer 7

20psi

Question 8

the maximum natural gas pressure inside a commercial building for a boiler or mechanical room located on the roof is …

a) 5psi
b) 10 psi
c) 66psi
d) 20 psi

Answer 8

c) 66 psi

Question 9

Minimum and maximum length of construction heater hoses

Answer 9

15ft - 75ft

Question 10

A gas pressure regulator is a device that …

Answer 10

Reduces pressure from the inlet to the outlet

Question 11

the maximum pressure drop allowed for natural gas piping systems with 7” wc is

a) 5” wc
b) 1” wc
c) 50%
d) pressure drop is not limited

Answer 11

b) 1” wc

Question 12

What are the 3 types of copper allowed to be used for gas supply?

Answer 12

Type G, L, K

Question 13

What materials can be used for gas piping

Answer 13

Steel, Copper, Plastic

Question 14

what is the maximum length of a flexible hose connecter used to suspend appliances to the piping system?

a) 5ft
b) 1ft
c) 6”
d) 2ft

Answer 14

d) 2ft

Question 15

what type of fittings may be used with steel pipe?

a) brass
b) copper
c) malleable iron
d) zinc

Answer 15

c) Malleable Iron

Question 16

The unthreaded portion of piping shall extend at least _____ “ through the wall

a) 1
b) 2
c) 3
d) 4

Answer 16

a) 2”

Question 17

Underground piping shall be joined by …

Answer 17

welding

Question 18

Plastic Piping shall be protected from …

Answer 18

Sunlight

Question 19

Plastic Piping shall be protected from …

Answer 19

Sunlight

Question 20

tubing installed in a residental building must be identified every _____ ft

a) 3
b) 10
c) 6
d) 5

Answer 20

c) 6 ft

Question 21

T or F

It is not necessary to purge every branch line in the system

Answer 21

F

Question 22

swing joints and unions shall not be used where piping is …

Answer 22

concealed

Question 23

on a recreational vehicle, all branch connections off the main gas supply shall be made

a) outside the vehicle
b) inside the vehicle
c) inside walls and partitions
d) at the back of the appliance

Answer 23

a) outside the vehicle