CNG (Compressed Natural Gas) (H3)
Compressed Natural Gas (CNG) is stored in high-pressure cylinders which are classified into four main types based on their construction materials and features.
Types: (H4)
- Type 1: Industrial use, standard vehicles, stationary storage
- Type 2: Vehicles where a balance of cost and weight is desired.
- Type 3: Premium vehicles where weight reduction is a priority.
- Type 4: High-performance vehicles, portable storage, marine environments, and cold climates.
Key Features: (H4)
- Weight: Types 3 and 4 are significantly lighter than Types 1 and 2, which improves vehicle fuel efficiency and performance.
- Corrosion Resistance: Composite types (Type 3 and 4) are highly resistant to corrosion, making them suitable for long-term use in harsh or marine environments, unlike steel cylinders that require regular protection.
- Cost: Type 1 steel cylinders are generally the most cost-effective, while composite cylinders have higher manufacturing costs.
- Safety: All types must adhere to strict international safety standards (e.g., ISO 11439, ECE R110). Composite materials in Type 4 cylinders distribute stress well during pressure changes, contributing to enhanced safety in rupture scenarios.
- Pressure: CNG is typically stored at high pressures, around 200-250 bar (2,900-3,600 psi), which all cylinder types are designed to handle.