High-Pressure CNG Gas Cylinders: Technical Procurement Guide
Engineered for commercial vehicle chassis integration, mobile tube trailers, and modular station storage, our high-pressure CNG cylinders combine strict material traceability with certified compliance to global pressure vessel codes.
Product Selection & Engineering Specifications
Selecting the correct cylinder requires matching operational pressure, volumetric capacity, and payload limits. Evaluate structural options by material and performance parameters below:
|
Cylinder Type |
Primary Material |
Working Pressure |
Test Pressure |
Key Advantage |
Primary Application |
|
Type I |
Seamless Alloy Steel (34CrMo4) |
200 bar / 250 bar |
300 bar / 375 bar |
High mechanical durability, lowest initial cost |
Stationary storage cascades, tube trailers |
|
Type II |
Steel Liner + Hoop-wrapped Carbon/Glass Fiber |
200 bar / 250 bar |
300 bar / 375 bar |
Reduced weight compared to Type I |
Transit buses, heavy-duty commercial trucks |
|
Type III |
Aluminum Liner (6061-T6) + Full-wrap Carbon Fiber |
200 bar / 250 bar |
300 bar / 375 bar |
Ultra-lightweight, high payload capacity |
Long-haul logistics fleets, lightweight transit |
|
Type IV |
Polymer Liner (HDPE) + Full-wrap Carbon Fiber |
200 bar / 250 bar |
300 bar / 375 bar |
Maximum weight reduction, zero metallic corrosion |
Application Context
Commercial Vehicle Fleets
Designed for chassis mounting on transit buses, refuse haulers, and regional distribution trucks. Integrated mounting interfaces and bracket tolerances are engineered to withstand continuous road-vibration fatigue.
Gas Transport Tube Trailers
Assembled in multi-cylinder bundles for over-the-road transport of compressed natural gas from regional compression plants to daughter refuelling stations.
Stationary Storage Cascades
Deploys at CNG fueling stations in high, medium, and low-pressure banks to enable fast-fill dispensing into vehicle fuel systems.
Materials, Manufacturing & Quality Verification
Raw Material Traceability
• Steel Cylinders (Type I & II): Forged from quenched and tempered 34CrMo4 seamless steel billets. Mill Test Certificates (MTC) are issued in strict compliance with EN 10204 3.1 standards.
• Liners (Type III): Extruded or deep-drawn 6061-T6 aluminum alloy ensuring uniform wall thickness and pressure fatigue resistance.
Manufacturing Workflow
• Hot Spinning / Neck Forging: Billets are induction heated and precision-formed under thermal control to maintain uniform crown thickness.
• Quenching & Tempering: Automated thermal treatment lines ensure consistent microstructural grain refinement and yield strength.
• CNC Machining: Neck threads (such as UNF, metric, or PBO specifications) are cut on multi-axis CNC lathes to guarantee seal integrity.
• Filament Winding (Types II, III, & IV): Computer-controlled tension winding of high-modulus carbon or glass fibers impregnated with structural epoxy resin.
Mandatory Testing Protocols
• Hydrostatic Pressure Test: 100% routine proof testing at 1.5x working pressure to verify elastic deformation behavior.
• Hydraulic Burst Test: Destructive batch testing to confirm safety margins exceed regulatory burst requirements (minimum 2.25x working pressure).
• Hydraulic Fatigue Cycle Testing: Sample testing up to 20,000+ operational cycles under extreme temperatures (-40°C to +85°C) without structural failure.
• Flaw Detection: Ultrasonic and magnetic particle inspection (MPI) utilized to eliminate surface and sub-surface material defects.
Compliance & International Certifications
Equipment supplied for high-pressure gaseous fuels requires certified regulatory approvals to clear port customs and pass local road administration inspections. Our production frameworks comply with:
ISO 11439: Compressed natural gas (CNG) vehicle fuel cylinders.
ECE R110: Uniform provisions for components of motor vehicles utilizing compressed natural gas.
DOT-SP / TC-SU (North American markets): Special permits for composite and steel pressure vessels.
ASME Section VIII / ISO 9809: Industrial stationary pressure vessel manufacturing codes.
Vendor Qualification & Factory Audit Standards
When evaluating our manufacturing facility for long-term supply contracts, engineering procurement teams review:
Production Scale: Annual capacity exceeding 150,000 units across automated hot-spinning lines and CNC finishing stations.
Quality Management System: Facilities certified under ISO 9001 and IATF 16949 (Automotive Quality Management).
Engineering Support: FEA (Finite Element Analysis) simulation reports provided during the RFP phase to validate custom bracket placement and stress distribution.
Export Protection: Export-grade wooden crating, nitrogen-purged internal dry sealing, and exterior corrosion-inhibitor coatings applied prior to container loading.
Frequently Asked Questions
Q: What is the certified design life of these CNG cylinders?
A: Type I steel cylinders typically carry a design life of 15 to 20 years, governed by local statutory requirements and internal corrosion monitoring. Composite cylinders (Types III and IV) generally feature a certified service life of 20 years, subject to scheduled periodic visual re-inspection under applicable standards (such as CSA or ISO codes).
Q: Can you accommodate custom dimensions for specific vehicle chassis layouts?
A: Yes. While standard diameters optimize production efficiency, we accept custom length specifications for OEM chassis integration, provided the design passes finite element stress analysis and prototype burst verification.
Q: What quality documentation accompanies each shipment?
A: Every delivery includes individual cylinder serial number test reports, raw material Mill Test Certificates (MTC), third-party inspection releases, and official handling and installation manuals.
Q: What are the standard production lead times for bulk fleet orders?
A: Standard production lead times range from 45 to 60 days following engineering drawing sign-off and commercial deposit receipt, depending on order volume and specific certification requirements.
Request a Technical Proposal
To evaluate pricing, delivery schedules, and regulatory compliance documentation for your upcoming project, please submit your technical parameters to our engineering desk:
Required RFP Specification Checklist:
Cylinder Type (Type I, II, III, or IV)
Working Pressure & Test Pressure
Water Capacity (Liters) or Physical Space Constraints (Max Outer Diameter & Length)
Target Standard / Certification (e.g., ECE R110, ISO 11439, DOT-SP)
Annual Volume & Delivery Schedule
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