Piping Flashcards
How many inches water column equals 1 psig pressure
28
what is the normal gas building supply pressure for a single family dwelling (Natural Gas)
7” wc
what is the normal gas pressure for a single family dwelling (Propane)
11” wc
what is the maximum natural gas or propane gas pressure allowed inside a one or 2 family dwelling
2 psig
What is the maximum pressure allowed inside an industrial building
66 psi
tubing installed in residential buildings must be supported every ______ ft
6ft
the maximum gas pressure inside a commercial building is
20psi
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
c) 66 psi
Minimum and maximum length of construction heater hoses
15ft - 75ft
A gas pressure regulator is a device that …
Reduces pressure from the inlet to the outlet
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
b) 1” wc
What are the 3 types of copper allowed to be used for gas supply?
Type G, L, K
What materials can be used for gas piping
Steel, Copper, Plastic
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
d) 2ft
what type of fittings may be used with steel pipe?
a) brass
b) copper
c) malleable iron
d) zinc
c) Malleable Iron
The unthreaded portion of piping shall extend at least _____ “ through the wall
a) 1
b) 2
c) 3
d) 4
a) 2”
Underground piping shall be joined by …
welding
Plastic Piping shall be protected from …
Sunlight
Plastic Piping shall be protected from …
Sunlight
tubing installed in a residental building must be identified every _____ ft
a) 3
b) 10
c) 6
d) 5
c) 6 ft
T or F
It is not necessary to purge every branch line in the system
F
swing joints and unions shall not be used where piping is …
concealed
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
a) outside the vehicle
