CNG INSPECTOR OF ARIZONA LLC.

Audit Title

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Labeling Blue “CNG” diamond label made of reflective durable material with minimum size of 4.7″ x 3.3″ must be on vertical surface on the lower right rear of the vehicle, but not on the bumper, to alert first responders of high pressure gas fuel system. Labels at fuel fill receptacle and in engine compartment must provide information as to system working pressure, tank expiration, next inspection date. [NFPA-52 Section 6.11]

Shielding Tanks Tanks must be protected from road hazards, loading, unloading, direct sunlight, exhaust heat, accidental cargo leakage. Shield must not directly contact tank nor trap solid materials or liquids. Cylinders & valves must be shielded with minimum 9 inches road clearance when tires are deflated and cannot be located ahead of the front axle or behind the rear bumper attachment. Must be transversely mounted if behind rear axle. [NFPA-52 Section 6.3]

CNG Tank Inspection:

Tank Inspection & Expiration CNG fuel tanks must be US Dept. of Transportation (DOT) approved. As the structural integrity of CNG tanks degrade over time, all tanks are required to have an expiration label. Do not continue to use expired cylinders! CNG tanks and fuel systems must also be visually inspected after a motor vehicle accident or fire and at least every 36 months or 36,000 miles, whichever comes first, for damage and deterioration per DOT regulation FMVSS 304. CSA-certified inspector. Cylinder life cannot be extended. Expired cylinders must be removed from service. [Ref. NFPA-52 Section 4.4]

CNG Tank Information:

Tank expiration date

Last known inspection date?

CNG Tank inspection items:

Valves, lines and/or Pressure Release Device (PRD) assemblies are damage free

PRD is in good condition (with no visible extrusion of eutectic material)

Pressure Relief Device (PRD) All CNG tanks must have one or more pressure relief devices which have been bonfire tested and approved by the tank manufacturer so as to rapidly vent gas away to the atmosphere in case of excess temperatures. When a natural gas vehicle is on fire, rapidly-expanding CNG in the tank can create internal pressures to the point of tank failure and catastrophic explosion. The PRD is usually located at the tank valve and is designed to activate at a specified temperature so as to rapidly empty the tank via the PRD port on the valve. It is especially critical that CNG tanks in enclosed areas (i.e. car trunk, SUV cargo area) be equipped with secured PRD tubing to vent away the fuel in case of fire. [Ref. NFPA-52 Sections 6.4 & 4.5]

Fuel and vent lines are properly attached to the vehicle

Vehicle history review (no incidents possibly damaging the cylinder(s)

Summary of examination and description of damage and/or adverse findings:

Observed Repairs or replaced brackets or other as noted:

Return cylinder(s) to service?

Repairs needed as follows:

Remove cylinders from service?

Installation of a new inspection(s) decal? Note inspection # on decal

Inspector signature:

Certified Inspector #

Certified Inspector #

Next Inspection due date: Not to exceed 36,000 miles or 36 Months