G2 Gas Technician Module 15 A Revised
What are the two main purposes of gas pressure regulators? - ANS-To reduce and
maintain the downstream pressure and to provide pressure to appliances or burners
What are the four categories of a gas pressure regulators? - ANS-First stage/Service
Regulator, Line Pressure Regulator, Appliance Regulator
What is lock up pressure and how do you check it? - ANS-The pressure under which
downstream pressure will stabilize after burner shuts down, Check it by closing shut-off
valve and measure downstream pressure
Where is the hydro-static relief valve used? - ANS-Liquid Propane between two shut off
valves
What must the size of the vent piping from a relief device be? - ANS-Same size as the
opening
What are the four elements of a direct-operated regulator? - ANS-Loading Element,
Measuring Element, Restricting Element, Atmospheric Vent
When flow rate increases through a regulator, what happens to the downstream
pressure? - ANS-Increases
What is the maximum allowed propane pressure in a building? - ANS-20 Psig
What controls the downstream pressure in a regulator? - ANS-The Loading Element
What type of regulator arrangement is required in all permanent propane installations? -
ANS-Two Stage Regulators
Will gas flow be interrupted by changing a propane cylinder if an automatic changeover
regulator is used on the installation? - ANS-No
What five factors need to be considered before selecting a regulator? - ANS-Rate of
Flow, The Type of Gas, Inlet Gas Pressure, Outlet Gas Pressure and Pipe size
What are the two main purposes of gas pressure regulators? - ANS-To reduce and
maintain the downstream pressure and to provide pressure to appliances or burners
What are the four categories of a gas pressure regulators? - ANS-First stage/Service
Regulator, Line Pressure Regulator, Appliance Regulator
What is lock up pressure and how do you check it? - ANS-The pressure under which
downstream pressure will stabilize after burner shuts down, Check it by closing shut-off
valve and measure downstream pressure
Where is the hydro-static relief valve used? - ANS-Liquid Propane between two shut off
valves
What must the size of the vent piping from a relief device be? - ANS-Same size as the
opening
What are the four elements of a direct-operated regulator? - ANS-Loading Element,
Measuring Element, Restricting Element, Atmospheric Vent
When flow rate increases through a regulator, what happens to the downstream
pressure? - ANS-Increases
What is the maximum allowed propane pressure in a building? - ANS-20 Psig
What controls the downstream pressure in a regulator? - ANS-The Loading Element
What type of regulator arrangement is required in all permanent propane installations? -
ANS-Two Stage Regulators
Will gas flow be interrupted by changing a propane cylinder if an automatic changeover
regulator is used on the installation? - ANS-No
What five factors need to be considered before selecting a regulator? - ANS-Rate of
Flow, The Type of Gas, Inlet Gas Pressure, Outlet Gas Pressure and Pipe size
