Chapter 55 - Design
- Section XI-5501 - Approval of CNG Systems Equipment and Components for Vehicles (Formerly section 2519)
- Section XI-5503 - Design and Construction of Cylinders and Pressure Vessels (Formerly section 2521)
- Section XI-5505 - Pressure Relief Devices (Formerly section 2523)
- Section XI-5507 - Pressure Gauges (Formerly section 2525)
- Section XI-5509 - Pressure Regulators (Formerly section 2527)
- Section XI-5511 - Piping (Formerly section 2529)
- Section XI-5513 - Valves (Formerly section 2531)
- Section XI-5515 - Hose and Hose Connections (Formerly section 2533)
- Section XI-5517 - Compression Equipment (Formerly section 2535)
- Section XI-5519 - Vehicle Fueling Connection (Formerly section 2537)