Section Standard No. This standard specifies requirements for the integrity of motor vehicle fuel systems using compressed natural gas CNG , including the CNG fuel systems of bi-fuel, dedicated, and dual fuel CNG vehicles. The purpose of this standard is to reduce deaths and injuries occurring from fires that result from fuel leakage during and after motor vehicle crashes. This standard applies to passenger cars, multipurpose passenger vehicles , trucks and buses that have a gross vehicle weight rating GVWR of 10, pounds or less and use CNG as a motor fuel. This standard also applies to school buses regardless of weight that use CNG as a motor fuel.
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Section Standard No. This standard specifies requirements for the integrity of compressed natural gas CNG , motor vehicle fuel containers. The purpose of this standard is to reduce deaths and injuries occurring from fires that result from fuel leakage during and after motor vehicle crashes. This standard applies to each passenger car , multipurpose passenger vehicle , truck , and bus that uses CNG as a motor fuel and to each container designed to store CNG as motor fuel on-board any motor vehicle.
The filler metal is distributed between the closely fitted surfaces of the joint by capillary attraction. Fill pressure means the internal pressure of a CNG fuel container attained at the time of filling. Fill pressure varies according to the gas temperature in the container which is dependent on the charging parameters and the ambient conditions. Full wrapped means applying the reinforcement of a filament or resin system over the entire liner , including the domes.
Hoop wrapped means winding of filament in a substantially circumferential pattern over the cylindrical portion of the liner so that the filament does not transmit any significant stresses in a direction parallel to the cylinder longitudinal axis.
Hydrostatic pressure means the internal pressure to which a CNG fuel container is taken during testing set forth in S5. Liner means the inner gas tight container or gas cylinder to which the overwrap is applied. It is the pressure for which the container has been constructed under normal conditions. S5 Container and material requirements. Container designations are as follows: S5. S7 Test requirements. Each CNG fuel container shall not leak when tested in accordance with S8. Burst pressure shall not be less than 2.
Burst pressure shall be not less than 2. Each CNG fuel container shall be equipped with a pressure relief device. Each CNG fuel container shall completely vent its contents through a pressure relief device or shall not burst while retaining its entire contents when tested in accordance with S8.
Each CNG fuel container shall be permanently labeled with the information specified in paragraphs a through h of this section. The information shall be in English and in letters and numbers that are at least 6. S8 Test conditions: fuel container integrity. The requirements of S7. In one test, position the center of the container over the center of the fire source.
In another test, position one end of the container so that the fire source is centered 0. To monitor flame temperature, place three thermocouples so that they are suspended 25 mm one inch below the bottom of the CNG fuel container.
Position thermocouples so that they are equally spaced over the length of the fire source or length of the container, whichever is shorter. Use a uniform fire source that is 1. Beginning five minutes after the fire is ignited, maintain an average flame temperature of not less than degrees Celsius degrees Fahrenheit as determined by the average of the two thermocouples recording the highest temperatures over a 60 second interval: 1.
Federal Motor Vehicle Safety Standards
Federal Motor Vehicle Safety Standards; Compressed Natural Gas Fuel Container Integrity
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FMVSS 304: Compressed Natural Gas Fuel Container Integrity
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