TEXAS CNG CATEGORY 3 EXAM | 127 QUESTIONS AND
ANSWERS | 2026 UPDATE | WITH COMPLETE SOLUTION
Cascade storage system Answer - Storage in multiple cylinders
CNG system Answer - Includes safety devices, cylinders, piping, fittings, valves,
compressors, regulators, gauges, relief devices, vents, installation fixtures, and
other CNG equipment.
Compressed natural gas Answer - A mixture of hydrocarbons in gases and
vapors consisting principally of methane.
Fuel supply cylinder Answer - A cylinder mounted upon a vehicle for storage of
CNG as a fuel supply for the vehicle's internal combustion engine
Pressure-filled Answer - Refers to a method of transferring CNG into cylinders
by using pressure differential
Transport Answer - Any vehicle or combination of vehicles and CNG cylinders
designed or adapted for use or used principally as a means of moving or
delivering CNG from one place to another..
Excess of 240 ft.³ water volume Answer - The installation of any CNG container
would result in an aggregate storage capacity of
CNG form 1500 Answer - 30 days prior to construction
, Initial submission $50
Resubmission $30
CNG form 1501 Answer - Must be submitted within 10 calendar days after
completion of the CNG installation having an aggregate storage capacity of less
than 240 standard cubic feet of CNG
Steel aluminum or composite materials Answer - Cylinders and pressure
vessels must be fabricated of
Not less than 2400 psig at 70°F Answer - Fuel supply cylinders must have a
rated service pressure of
Not less than 3600 psig at 70°F Answer - Cascade storage cylinders should have
a rated service pressure of
DOT 3AA specifications Answer - Steel cylinders must be manufactured and
tested in compliance with
DOT FRP1 standard Answer - Fiber reinforced plastic and full composite
cylinders must comply with
DOT FRP2 standard Answer - Fiber reinforced plastic and hose wrapped
composite cylinders must comply with
250 psig Answer - Vapor recovery receivers must have a minimum rating
service pressure of
ANSWERS | 2026 UPDATE | WITH COMPLETE SOLUTION
Cascade storage system Answer - Storage in multiple cylinders
CNG system Answer - Includes safety devices, cylinders, piping, fittings, valves,
compressors, regulators, gauges, relief devices, vents, installation fixtures, and
other CNG equipment.
Compressed natural gas Answer - A mixture of hydrocarbons in gases and
vapors consisting principally of methane.
Fuel supply cylinder Answer - A cylinder mounted upon a vehicle for storage of
CNG as a fuel supply for the vehicle's internal combustion engine
Pressure-filled Answer - Refers to a method of transferring CNG into cylinders
by using pressure differential
Transport Answer - Any vehicle or combination of vehicles and CNG cylinders
designed or adapted for use or used principally as a means of moving or
delivering CNG from one place to another..
Excess of 240 ft.³ water volume Answer - The installation of any CNG container
would result in an aggregate storage capacity of
CNG form 1500 Answer - 30 days prior to construction
, Initial submission $50
Resubmission $30
CNG form 1501 Answer - Must be submitted within 10 calendar days after
completion of the CNG installation having an aggregate storage capacity of less
than 240 standard cubic feet of CNG
Steel aluminum or composite materials Answer - Cylinders and pressure
vessels must be fabricated of
Not less than 2400 psig at 70°F Answer - Fuel supply cylinders must have a
rated service pressure of
Not less than 3600 psig at 70°F Answer - Cascade storage cylinders should have
a rated service pressure of
DOT 3AA specifications Answer - Steel cylinders must be manufactured and
tested in compliance with
DOT FRP1 standard Answer - Fiber reinforced plastic and full composite
cylinders must comply with
DOT FRP2 standard Answer - Fiber reinforced plastic and hose wrapped
composite cylinders must comply with
250 psig Answer - Vapor recovery receivers must have a minimum rating
service pressure of
