Texas CNG Category 3 Exam Latest
Update
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
DOT regulations & ASME code - Answer Vapor recovery receivers must be
manufactured, inspected, marked, tested, and if applicable retested in accordance with
Rules for the construction of unfired pressure vessels,
ASME boiler and pressure vessel code section VIII - Answer Pressure vessels and
containers other than cylinders shall be manufactured, inspected, Marked, and tested in
accordance with
Compressed gas Association pamphlet S - 1.1 - Answer Pressure release devices for
cylinders must be in accordance with
Pressure relief device must communicate with - Answer The fuel and be vented to the
atmosphere by a method that will withstand the maximum pressure which will result
The discharge flow rate of the pressure relief device must - Answer Not be reduced
below that required for the capacity of the container upon which the device is installed
Pressure relief devices must be located so that - Answer The temperature to which they
are subjected is representative of the temperature to which the cylinder is subject
Pressure relief valves for CNG service must - Answer Not be fitted with lifting devices,
provided with means for sealing the external adjustments prevent tampering by
unauthorized persons, and if the seal is broken at any time the valve must be removed
from service
Piping, tubing, fittings, gaskets, and packing material must be - Answer Compatible with
the fuel under the service conditions
Type 304 Stainless Steel - Answer All tubing must be a minimum of
All tubing connectors must be - Answer A minimum of type 304 stainless steel industrial
type connectors having a minimum design pressure of 5000 psig
A hydrostatic test of at least four times the rated working pressure without structural
failure - Answer Piping, tubing, fittings, and other piping components between a cylinder
or pressure vessel and the first shutoff valve must be capable of withstanding
Schedule 80 ASTM Steel - Answer Piping must be
6,000 psi or greater - Answer All pipe fittings must be forged steel stamped
Update
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
DOT regulations & ASME code - Answer Vapor recovery receivers must be
manufactured, inspected, marked, tested, and if applicable retested in accordance with
Rules for the construction of unfired pressure vessels,
ASME boiler and pressure vessel code section VIII - Answer Pressure vessels and
containers other than cylinders shall be manufactured, inspected, Marked, and tested in
accordance with
Compressed gas Association pamphlet S - 1.1 - Answer Pressure release devices for
cylinders must be in accordance with
Pressure relief device must communicate with - Answer The fuel and be vented to the
atmosphere by a method that will withstand the maximum pressure which will result
The discharge flow rate of the pressure relief device must - Answer Not be reduced
below that required for the capacity of the container upon which the device is installed
Pressure relief devices must be located so that - Answer The temperature to which they
are subjected is representative of the temperature to which the cylinder is subject
Pressure relief valves for CNG service must - Answer Not be fitted with lifting devices,
provided with means for sealing the external adjustments prevent tampering by
unauthorized persons, and if the seal is broken at any time the valve must be removed
from service
Piping, tubing, fittings, gaskets, and packing material must be - Answer Compatible with
the fuel under the service conditions
Type 304 Stainless Steel - Answer All tubing must be a minimum of
All tubing connectors must be - Answer A minimum of type 304 stainless steel industrial
type connectors having a minimum design pressure of 5000 psig
A hydrostatic test of at least four times the rated working pressure without structural
failure - Answer Piping, tubing, fittings, and other piping components between a cylinder
or pressure vessel and the first shutoff valve must be capable of withstanding
Schedule 80 ASTM Steel - Answer Piping must be
6,000 psi or greater - Answer All pipe fittings must be forged steel stamped
