EAS-CNG-CONVERSION
 

CNG Tanks

CNG Fuel Containers require visual inspection for damage or deterioration every 36 months or 36,000 miles.  A qualified inspector will note cuts, cracks, gouges, abrasions, discoloration, broken fibers, loose brackets, gaskets, heat damage and other problems, and recommend proper action to assure safety.

Background
1.0
CNG Cylinders
1.1 Terms and Definitions

2.0 Description of CNG Cylinders
2.1 Type 1 (all-metal) Cylinders
2.2 Type 2 (hoop-wrapped) Cylinders
2.3 Type 3 (full-wrapped) Cylinders
2.4 Type 4 (all-composite) Cylinders
2.5 Sensitivity of Cylinder Materials to Operating Conditions and Solutions
2.6 Determining Cylinder Type

3.0 CNG Cylinder Standards
3.1 Identifying Applicable Cylinder Standards from Cylinder
3.2 ANSI/CSA NGV2 Cylinder Standards
3.3 Federal Motor Vehicle Safety Standards (FMVSS) 304
3.4 CGA/DOT FRP-1 and FRP-2

4.0 Installation of Cylinders on Vehicles
4.1 Cylinder Mounting
4.2 Cylinder Shielding

5.0 Cylinder Handling
5.1 Cylinder De-Fueling
5.1.1 Atmospheric Venting Equipment
5.1.2 Emergency De-Fueling Procedure
5.1.3 Scheduled De-Fueling Procedure
5.1.4 De-Fueling to the Station Compressor Inlet

Inspection
6.0
Cylinder Inspection
6.1 Guidelines for Determining Inspection Requirements
6.2 Guidelines for Visual Inspection
6.2.1 General Visual Inspection
6.2.2 Detailed Visual Inspection
6.2.3 Classification of Visual Damage
6.2.4 Cylinder Destruction
6.2.5
Cylinder Inspection Form
6.3 Hydrostatic Testing
6.4 Acoustic Emission Testing

Damage
7.0
Types of Cylinder Damage
7.1
Surface Corrosion in Steel Cylinder  
7.2
Fatigue Crack Growth in Steel and Aluminum  
7.3
Scuffing Abrasion Damage in Composite  
7.4
Surface Cuts to Composite Wrap  
7.5
Impact Damage to Carbon Composite Wrap
7.6
Stress Corrosion Cracking of Fiberglass
7.7
Fire or Heat Damage
7.8
Additional Examples of Damage

8.0 Pressure Relief Devices

References
9.0
References and other Resources
9.1
List of Standards
9.2
List of Cylinder Manufacturers
9.3
Additional Information Sources


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