CNG Gas Cylinder
Heavy-Duty Type III & Type IV CNG Gas Cylinders: Engineering & Procurement Specifications
Engineered for heavy-duty commercial transport and gas distribution infrastructure, our compressed natural gas (CNG) cylinders deliver high gravimetric efficiency and strict compliance with international pressure vessel codes. Built for operating pressures of 20 MPa to 25 MPa, these cylinders integrate high-strength carbon fiber filament winding with corrosion-resistant liners to reduce vehicle payload deadweight while meeting rigorous cyclic fatigue standards.
Technical Specifications & Configurations
|
Specification |
Type III (Aluminium Liner + Carbon Fiber) |
Type IV (HDPE Liner + Carbon Fiber) |
|
Liner Material |
Seamless Aluminium Alloy 6061-T6 |
High-Density Polyethylene (HDPE) |
|
Reinforcement |
High-Strength Carbon Fiber / Epoxy Resin |
High-Strength Carbon Fiber / Epoxy Resin |
|
Nominal Working Pressure |
20 MPa / 25 MPa |
20 MPa / 25 MPa |
|
Hydraulic Test Pressure |
30 MPa / 37.5 MPa |
30 MPa / 37.5 MPa |
|
Water Capacity Range |
50L - 450L |
100L - 500L |
|
Operating Temperature |
-40°C to +85°C |
-40°C to +85°C |
|
Design Life |
15 – 20 Years |
15 – 20 Years |
|
Compliance Standards |
ECE R110, ISO 11439, CSA/ANSI NGV2 |
ECE R110, ISO 11439, CSA/ANSI NGV2 |
Material Engineering & Manufacturing Process
Liner Formation & Integrity
Type III Aluminium Liners: Extruded and deep-drawn from seamless 6061-T6 aluminium billets, eliminating structural welds. Dimensional tolerance on wall thickness is controlled within ±0.15 mm to ensure uniform stress distribution during autofrettage.
Type IV Polymeric Liners: Rotational-molded or blow-molded using high-molecular-weight HDPE compounds, optimized for gas impermeability and resistance to micro-cracking under rapid thermal cycling.
Full-Surface CNC Filament Winding
Cylinders undergo multi-axis computer-controlled helical and hoop winding using aerospace-grade carbon fiber rovings impregnated with a toughened epoxy resin matrix. Fiber tension is dynamically monitored via closed-loop feedback systems to maintain void content below 1.5%.
Curing & Autofrettage
Thermal Curing: Multi-stage programmable thermal ovens cure the resin matrix at strictly controlled ramp rates to prevent thermal degradation and residual internal stress.
Autofrettage Process: Cylinders are hydraulically pressurized beyond the nominal working pressure (typically 1.5x to 1.8x working pressure) to induce controlled plastic deformation in the metal boss/liner interface, generating beneficial compressive residual stresses that extend fatigue life.
Quality Control & Non-Destructive Testing
Manufacturing compliance is verified at distinct checkpoints:
Ultrasonic Testing
100% volumetric inspection of metal liners and wound shells to detect internal micro-voids, delamination, or wall thickness anomalies.
Hydrostatic Burst Testing
Random sampling per production batch tested to destruction in a contained water jacket chamber to verify ultimate burst pressure exceeds safety margins (>2.25x working pressure).
Ambient & Accelerated Cyclic Pressure Testing
Cylinders undergo hydraulic pressure cycle testing from zero to working pressure for over 45,000 cycles without structural failure.
Gas Permeation & Leak Testing
Helium mass spectrometer testing conducted on finished assemblies to quantify gas tightness.
Target Applications
Commercial Fleets & Heavy-Duty Trucks
Frame-mounted fuel storage arrays for long-haul LNG/CNG commercial transport vehicles.
Public Transit
Roof-mounted modular cylinder banks for city buses and municipal transit fleets requiring strict center-of-gravity optimization.
Mobile Gas Transport (Cascades/Skids)
High-capacity transport skids used in virtual pipeline distribution networks for industrial gas delivery.
Frequently Asked Questions
Request Technical Data Sheet & Quotation
To evaluate cylinder dimensions, CAD integration files, or batch pricing for your vehicle platform or storage project, submit your technical requirements below.
Required Working Pressure
[ 20 MPa / 25 MPa ]
Target Water Capacity
[ Liters ]
Application Type
[ Commercial Vehicle / Mobile Skid / Stationary Storage ]
Required Certification Standard
[ ECE R110 / ISO 11439 / DOT-SP / NGV2 ]
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