Industrial-Grade Small LPG Gas Cylinders for OEM & Bulk Distribution
Portable, certified low-pressure gas containment engineered for commercial appliances, outdoor equipment, and regional gas distribution networks. Built to ISO 4706, EN 1442, and DOT-4B standards.
Product Identification & Specifications
Portable LPG cylinders designed for repeatable filling cycles, structural durability, and strict compliance with international pressure equipment directives.
Standard Technical Parameters
|
Model |
Water Capacity (L) |
LPG Capacity (kg) |
Tare Weight (kg) |
Outer Diameter (mm) |
Height (mm) |
Wall Thickness (mm) |
Test Pressure (MPa) |
|
S-LPG-02 |
4.8 |
2.0 |
2.5 |
220 |
310 |
2.3 |
3.0 |
|
S-LPG-05 |
12.0 |
5.0 |
5.2 |
300 |
450 |
2.5 |
3.0 |
|
S-LPG-09 |
21.6 |
9.0 |
8.8 |
300 |
650 |
2.7 |
3.0 |
|
S-LPG-10 |
24.0 |
10.0 |
9.5 |
300 |
700 |
2.7 |
3.0 |
Shell Material: HP295 fine-grain pressure vessel steel (yield strength >= 295 MPa, tensile strength 410-550 MPa).
Valve Options: POL, QCC1, DIN, or customized thread interfaces matching regional distribution requirements.
Surface Coating: Electrostatic powder coat (minimum thickness 60 microns), UV-resistant, salt-spray tested to 500 hours (ASTM B117).
Product Selection Guide: Choosing the Right Cylinder
Selecting the correct cylinder specification depends on end-use application profiles, filling regulations, and weight constraints.
By Application Requirement
• Outdoor Camping & Portable Stoves (1kg - 3kg): Requires low tare weight, compact outer diameter (<= 220 mm), and manual hand-wheel valves.
• Patio Heaters & BBQ Grills (5kg - 9kg): Requires standard collar configuration, stable base ring clearance, and compatibility with low-pressure regulators (30mbar / 37mbar / 2.75kPa).
• Roofing Torches & Mobile Construction (5kg - 10kg): Requires high mechanical impact resistance, reinforced foot rings, and liquid withdrawal or vapor withdrawal dip-tubes.
Material Selection Matrix
• Steel Cylinders (HP295): Traditional, cost-effective, robust impact resistance; ideal for standard industrial rental pools and heavy distribution use.
• Composite Cylinders (Fiberglass/HDPE): Ultra-lightweight, translucent (visible fuel level), non-corrosive, spark-proof; ideal for marine, premium RV, and consumer-facing applications.
Application Domain Suitability
Small LPG cylinders are engineered to serve diverse operating environments across three core market segments:
Outdoor Hospitality: Designed for commercial patio heaters and mobile catering carts, providing reliable fuel delivery while fitting securely within standard appliance enclosures without restricting airflow.
Consumer Recreation: Optimized for portable camping stoves, tailgate grills, and recreational vehicle (RV) heating systems, featuring secure collar mounts designed to withstand transport vibration profiles.
Light Industrial and Construction: Built for heavy-duty job-site applications including roofing torches, bitumen melting, and copper pipe brazing, enduring accidental drops and harsh weathering elements.
Manufacturing Process & Quality Assurance
Our manufacturing facility operates under ISO 9001 and ISO 3834 welding quality standards, utilizing automated production lines to eliminate human error in pressure boundary construction.
Step-by-Step Production Workflow
Blanking & Deep Drawing: Cold-rolled HP295 steel coils are blanked into circular discs and deep-drawn into symmetrical upper and lower cup halves via 400T hydraulic presses.
Edge Trimming & Joggling: Cup edges are precision-trimmed to exact tolerances to ensure uniform fit-up before circumferential welding.
Robotic Circumferential Welding: Upper and lower halves are joined using automated Gas Metal Arc Welding (GMAW / MIG) under a shielding gas mixture. Weld penetration is continuously monitored via automated amperage/voltage tracking.
Collar & Foot Ring Attachment: Handles, valve guards, and foot rings are spot- and fillet-welded to the shell body, ensuring load-bearing stability during drop tests.
Thermal Stress Relieving: Assembled cylinder shells undergo full-body normalizing heat treatment at 650 deg C for 45 minutes to eliminate residual welding stresses and homogenize the crystal grain structure.
Hydrostatic Pressure Testing: 100% of production cylinders are subjected to water jacket hydrostatic testing at the designated test pressure (e.g., 3.0 MPa) for a minimum of 30 seconds to verify volumetric expansion limits.
Surface Preparation & Coating: Cylinders pass through an automated shot-blasting chamber (Sa 2.5 surface cleanliness standard), followed by electrostatic powder application and thermal curing at 200 deg C.
Valve Installation & Pneumatic Leak Testing: Brass valves are torqued to precise specifications using calibrated pneumatic tools, followed by submersed air leak testing at 1.2 MPa.
Regulatory Compliance & Certifications
ISO 4706 / EN 1442: Portable refillable welded steel cylinders.
TPED (2010/35/EU): Transportable pressure equipment directive for European market access.
DOT-4B: Department of Transportation specifications (available for North American export orders).
Third-Party Inspection: Batch testing reports available from TÜV, SGS, or BV upon request.
Supplier Qualification & Factory Audit Indicators
For procurement teams conducting risk assessments, our manufacturing metrics are structured to meet global tier-1 supply chain requirements:
Traceability: Heat numbers are laser-etched onto the cylinder collar, mapping back to the original steel mill material test certificate (MTC 3.1).
Production Capacity: 3 automated lines yielding a stable output of 50,000 units per month.
Minimum Order Quantity (MOQ): 1x 20-foot container (FCL), mixed sizes permissible within structural tier limits.
Packaging & Logistics: Bulk palletized with protective corrugated interleaves or individual heavy-duty carton boxes depending on retail or industrial delivery requirements.
Frequently Asked Questions
Q: What is the design lifespan of a steel small LPG cylinder?
A: Standard industrial steel cylinders are designed for a service life of 10 to 15 years, subject to mandatory periodic re-qualification and re-inspection intervals mandated by local transport and safety authorities (e.g., periodic hydrostatic testing every 5 to 10 years).
Q: Can the valve threads and collar heights be customized for our local market?
A: Yes. We supply cylinders equipped with regional specific valves (POL for Australia/NZ/US, QCC1 for North America, Compact/W21.8 for Europe, and customized dimensions) matching exact domestic filling plant connection standards.
Q: What documentation is provided with a bulk shipment?
A: Each shipment includes the Bill of Lading, Commercial Invoice, Packing List, Certificate of Origin (Form A/CO), Mill Test Certificates (MTC) for steel batches, and Third-Party Inspection Certificates (TPI) verifying burst test and hydrostatic test results.
Q: How are empty cylinders prepared for international container shipping?
A: Cylinders are thoroughly dried internally post-hydrostatic testing to prevent flash rust, evacuated, fitted with protective plastic thread caps, and secured onto fumigation-free wooden pallets or stacked tightly with dunnage bags to prevent transit friction.
Request Technical Data Sheet or Quotation
To request batch pricing, custom valve configurations, or third-party test reports for your engineering review, connect directly with our technical sales team:
[Request Specification Sheet & Quote]
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