Page 24 - CNG ESP Participant Guide2024

Module 2: High-Pressure CNG Fuel System Components

Cylinder Valves

Electro-
Manual Electric
Mechanical
▪ Three types:
o Manual
o Electric
o Electro-Mechanical
▪ All types open and close the flow of fuel from the storage cylinders

Four Types of CNG There are four types of CNG cylinders defined primarily by their manufacturing materials.
Cylinders They are labeled or identified by number.

Type 1: All-metal (steel or aluminum
▪ All-metal cylinder
▪ Made of steel or aluminum

Type 2: Hoop-wrapped steel or aluminum
▪ Metal liner
▪ Hoop-wrapped with fiber and resin
composite

Type 3: Fully-wrapped steel or aluminum
▪ Metal liner
▪ Fully-wrapped with fiber and resin composite

Type 4: All-composite (non-metallic)
▪ Non-metallic liner
▪ Fully-wrapped with fiber and resin composite

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