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CSA NGV 6.1-2016 pdf free download
CSA NGV 6.1-2016 pdf free download.Compressed Natural Gas ( CNG ) fuel storage and delivery systems for road vehIcles.
The minimum default number of durability start/stop test cycles is given as 100 000 for commercial vehicles. A different number of durability start/stop test cycles for light-duty personal vehicles can be expressed based on vehicle life if determined for the application. The typical average trip length for light-duty vehicles is 20 km/cycle.
The portion of the pressure system downstream of the shutoff valve may experience a full pressure cycle on each start cycle due to leakdown through the fuel system when the key Is off. A lower number of cycles may be justified if there is a downstream positive shutoff to prevent leakdown. Vehicles with start-stop systems to reduce idling fuel consumption may experience a greater number of start-stop cycles, but because of the short duration of the stop cycle, the likelihood of a leakdown pressure cycle is low.
5.3.9 MaterIal compatibility
Consideration should be given to the interaction of materials when connecting components. All components used shall be compatible with natural gas. See Clause 5.3.6.
5.3.10 Corrosion and other external exposure
Components should be resistant to corrosion, stress corrosion cracking, and other effects due to weather, chlorides (sodium and small amounts of calcium), other road chemicals, ultraviolet light (sunlight), vehicle fluids (gasoline, hydraulic fluids, battery acid, windshield washer fluid, glycols, oils, etc.), exhaust gases, and ozone aging. Resistance to galvanic corrosion should be taken under consideration when joining components containing dissimilar metals or carbon composite materials. Note: Other types of chlorides shall be considered for testing if specified in customer requirements.
System components located in underbody locations are generally most exposed to corrosion damage and deterioration. The external system should be designed for a safe vehicle lifetime in the exposure areas. Components mounted in the lower portions of the chassis may experience full immersion or high-pressure wash systems.
The system may be exposed to a wide range of potentially damaging chemicals. The following list has
been developed as representative of the major hazard categories although may be expanded based on
• Sulfuric acid —19 percent solution by volume in water;
• Sodium hydroxide —25 percent solution by weight in water;
• Methanol/gasoline —5/95 percent concentration of MS fuel meeting the requirements of Standard Specification for Automotive Spark-Ignition Engine Fuel, ASTM 04814;
• Ammonium nitrate — 28 percent by weight in water; and
• Windshield washer fluid (50 percent by volume solution of methyl alcohol and water).CSA NGV 6.1-2016 pdf free download.
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