TSSA G3 Test Questions and Correct Answers
Are Swagelok fittings allowed?
Yes
Are press-connected fittings allowed?
Yes
What is the minimum and maximum length of hose allowed for connecting to a
construction heater?
15' to 75'
During the period when an appliance is not connected to an outlet of piping system, how
shall the outlet be made gas tight?
Capped
What is the minimum length and maximum diameter of a dirt pocket on an NPS 6 pipe
drop to an appliance?
6" length and 2" diameter
Can street elbows or closed nipples be used on a gas piping system?
No
What is the maximum length of a flexible connector used to connect a suspended
appliance to a piping system?
2'
Can air be purged out of a gas piping system into a combustion chamber?
No
,What is the maximum propane supply pressure allowed in a single-family dwelling?
2 psig
What is the maximum propane supply pressure allowed in a central mechanical room
located on the roof of a commercial building?
20 psig
What is the maximum allowable natural gas pressure allowed in an industrial
mechanical room?
66 psi
What is the maximum propane pressure allowed inside an industrial building?
20 psi
What type of fittings may be used with steel pipe?
Malleable iron
The unthreaded portion of a piping outlet shall extend how many inches through a
floor?
2"
What is the minimum distance below a commercial parking lot gas piping is allowed to
be buried?
24"
Underground piping joints shall be:
Welded or press-connect fittings
Piping joint tape shall be:
, Approved
What is the maximum allowed spacing for supports on NPS 3 horizontal piping?
15'
Coated copper tubing or corrugated stainless-steel tubing employed on a 2 psi supply of
150 feet shall be pressure tested to:
15 psig for 15 minutes
Who is permitted to weld gas piping?
A welder certified by TSSA's Boiler and Pressure Vessels Division who is using an approved
welding method
Piping of NPS ____ and over should have welded pipe joints
2.5"
The length and diameter of a 4" dirt pocket shall be?
4" long and 2" diameter
Hose used to connect the propane supply to a domestic water heater shall:
Not be permitted
When installed underground, which type of copper tuning does not require a protective
coating?
Type K
Does a water heater require a drip pocket?
Yes
Are Swagelok fittings allowed?
Yes
Are press-connected fittings allowed?
Yes
What is the minimum and maximum length of hose allowed for connecting to a
construction heater?
15' to 75'
During the period when an appliance is not connected to an outlet of piping system, how
shall the outlet be made gas tight?
Capped
What is the minimum length and maximum diameter of a dirt pocket on an NPS 6 pipe
drop to an appliance?
6" length and 2" diameter
Can street elbows or closed nipples be used on a gas piping system?
No
What is the maximum length of a flexible connector used to connect a suspended
appliance to a piping system?
2'
Can air be purged out of a gas piping system into a combustion chamber?
No
,What is the maximum propane supply pressure allowed in a single-family dwelling?
2 psig
What is the maximum propane supply pressure allowed in a central mechanical room
located on the roof of a commercial building?
20 psig
What is the maximum allowable natural gas pressure allowed in an industrial
mechanical room?
66 psi
What is the maximum propane pressure allowed inside an industrial building?
20 psi
What type of fittings may be used with steel pipe?
Malleable iron
The unthreaded portion of a piping outlet shall extend how many inches through a
floor?
2"
What is the minimum distance below a commercial parking lot gas piping is allowed to
be buried?
24"
Underground piping joints shall be:
Welded or press-connect fittings
Piping joint tape shall be:
, Approved
What is the maximum allowed spacing for supports on NPS 3 horizontal piping?
15'
Coated copper tubing or corrugated stainless-steel tubing employed on a 2 psi supply of
150 feet shall be pressure tested to:
15 psig for 15 minutes
Who is permitted to weld gas piping?
A welder certified by TSSA's Boiler and Pressure Vessels Division who is using an approved
welding method
Piping of NPS ____ and over should have welded pipe joints
2.5"
The length and diameter of a 4" dirt pocket shall be?
4" long and 2" diameter
Hose used to connect the propane supply to a domestic water heater shall:
Not be permitted
When installed underground, which type of copper tuning does not require a protective
coating?
Type K
Does a water heater require a drip pocket?
Yes
