Inspection of the CNG Fuel Tank Visual

wv mm 47.07.000

Warning: Compressed natural gas is highly flammable. See the safety precautions listed, see CNG General Information of the Walk-In Van Chassis Operator's Manual or of the Walk-In Van Chassis Workshop Manual, or take the vehicle to an authorized Freightliner dealer. Failure to observe these precautions could lead to the ignition of the natural gas, which could cause severe bodily harm, or death, or property damage.

Each fuel tank must be visually inspected at specified intervals for external damage and deterioration. The inspection must be performed by a qualified person, in accordance with the manufacturer's established reinspection criteria and Compressed Gas Association documents.

Perform this maintenance procedure as indicated in the maintenance interval chart in this manual. See Table. for the remedies to any damage found on the tank. See of the Walk-In Van Chassis Workshop Manual for tank repair procedures, or take the vehicle to an authorized Freightliner dealer.

Table 1, CNG Tank Visual Inspection

CNG Tank Visual Inspection
Damage	Condition	Remedy
Abrasion on the Fiberglass Wrap	Less Than 0.010 Inch (0.3 mm) Deep	No repair needed.
	More Than 0.010 Inch (0.3 mm) But Less Than 0.030 Inch (0.8 mm) Deep	Repair.
	More Than 0.030 Inch (0.8 mm) Deep	Replace tank.
Cuts in the Fiberglass Wrap	Less Than 0.020 Inch (0.5 mm) Deep	No repair needed.
	More Than 0.020 Inch (0.5 mm) But Less Than 0.030 Inch (0.8 mm) Deep	Repair if less than 8 inches (200 mm) long.
	More Than 0.030 Inch (0.8 mm) Deep	Replace tank.
Dents on Metal Ends	Less Than 0.060 Inch (1.6 mm) Deep	No repair needed
Dents on Metal Ends	More Than 0.060 Inch (1.6 mm) Deep	Replace tank.
Gouges on Metal Ends	Bare Metal is Exposed	Replace tank.
Chipped Paint on Tank Ends	No Gray Primer Seen	No repair is needed.
	Gray Primer Seen, But Not Damaged	Repair with two-part epoxy resin.
	Gray Primer Damaged	Repair. Sand and remove rust, clean with pre-paint solvent, apply cold-galvanizing zinc primer and apply two-part epoxy resin.
Stress Cracks from Acid	Cracks in Fiberglass	Remove tank for inspection if exposed to acid. Replace if cracks are seen. Replace strap gaskets if exposed to acid.
Strap Gaskets	Gaskets Damaged or Missing	Approved gaskets must be installed between strap and tank. Replace strap gaskets if exposed to acid.
Tank Shield	Shield is Damaged	Repair or replace shield.
Tank Is Old	Tank is 15 Years Old	Replace tank after 15 years from date on label.
Vehicle Was in Accident or Fire	Tank Was Hot or Damaged From Impact.	Replace tank or remove tank and test.

Table 1, CNG Tank Visual Inspection

Note:

Walk-In Van Chassis Maintenance Manual

Inspection of the CNG Fuel Tank Visual

Table 1, CNG Tank Visual Inspection

Table 1, CNG Tank Visual Inspection