TEXAS CNG CATEGORY 3 EXAM
QUESTIONS AND ANSWERS GRADED A+
2026
Cascade storage system - ANS Storage in multiple cylinders
CNG system - ANS Includes safety devices, cylinders, piping, fittings, valves, compressors,
regulators, gauges, relief devices, vents, installation fixtures, and other CNG equipment.
Compressed natural gas - ANS A mixture of hydrocarbons in gases and vapors consisting
principally of methane.
Fuel supply cylinder - ANS A cylinder mounted upon a vehicle for storage of CNG as a fuel
supply for the vehicle's internal combustion engine
Pressure-filled - ANS Refers to a method of transferring CNG into cylinders by using pressure
differential
Transport - ANS 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..
@COPYRIGHT 2026/2027 ALLRIGHTS RESERVED 1
, Excess of 240 ft.³ water volume - ANS The installation of any CNG container would result in
an aggregate storage capacity of
CNG form 1500 - ANS 30 days prior to construction
Initial submission $50
Resubmission $30
CNG form 1501 - ANS 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 - ANS Cylinders and pressure vessels must be
fabricated of
Not less than 2400 psig at 70°F - ANS Fuel supply cylinders must have a rated service
pressure of
Not less than 3600 psig at 70°F - ANS Cascade storage cylinders should have a rated service
pressure of
DOT 3AA specifications - ANS Steel cylinders must be manufactured and tested in compliance
with
DOT FRP1 standard - ANS Fiber reinforced plastic and full composite cylinders must comply
with
DOT FRP2 standard - ANS Fiber reinforced plastic and hose wrapped composite cylinders
must comply with
@COPYRIGHT 2026/2027 ALLRIGHTS RESERVED 2
QUESTIONS AND ANSWERS GRADED A+
2026
Cascade storage system - ANS Storage in multiple cylinders
CNG system - ANS Includes safety devices, cylinders, piping, fittings, valves, compressors,
regulators, gauges, relief devices, vents, installation fixtures, and other CNG equipment.
Compressed natural gas - ANS A mixture of hydrocarbons in gases and vapors consisting
principally of methane.
Fuel supply cylinder - ANS A cylinder mounted upon a vehicle for storage of CNG as a fuel
supply for the vehicle's internal combustion engine
Pressure-filled - ANS Refers to a method of transferring CNG into cylinders by using pressure
differential
Transport - ANS 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..
@COPYRIGHT 2026/2027 ALLRIGHTS RESERVED 1
, Excess of 240 ft.³ water volume - ANS The installation of any CNG container would result in
an aggregate storage capacity of
CNG form 1500 - ANS 30 days prior to construction
Initial submission $50
Resubmission $30
CNG form 1501 - ANS 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 - ANS Cylinders and pressure vessels must be
fabricated of
Not less than 2400 psig at 70°F - ANS Fuel supply cylinders must have a rated service
pressure of
Not less than 3600 psig at 70°F - ANS Cascade storage cylinders should have a rated service
pressure of
DOT 3AA specifications - ANS Steel cylinders must be manufactured and tested in compliance
with
DOT FRP1 standard - ANS Fiber reinforced plastic and full composite cylinders must comply
with
DOT FRP2 standard - ANS Fiber reinforced plastic and hose wrapped composite cylinders
must comply with
@COPYRIGHT 2026/2027 ALLRIGHTS RESERVED 2
