Heavy-Duty Welded Steel Household LPG Gas Cylinders
Engineered for LPG Bottling Plants, Regional Distributors, and Gas Utilities.
Built strictly to ISO 4706, EN 1442, or DOT-4BA standards. Fully traceable material testing, automated circumferential arc welding, and 100% hydrostatic pressure testing.
Product Selection Guide (Specification Matrix & CAD Downloads)
To match your local distribution framework and regulatory requirements, review the core engineering parameters of our standard household configurations. Custom footprints, collar designs, and valve threading are available upon engineering review.
|
Model / Capacity |
Water Capacity |
Nominal Tare Weight |
Wall Thickness (Min.) |
Outer Diameter |
Overall Height |
Standard Compliance |
|
LPG-05KG |
12.0 L |
6.0 kg |
2.3 mm |
300 mm |
450 mm |
ISO 4706 / EN 1442 |
|
LPG-10KG |
23.5 L |
10.5 kg |
2.5 mm |
310 mm |
580 mm |
ISO 4706 / EN 1442 |
|
LPG-12.5KG |
26.2 L |
11.5 kg |
2.7 mm |
320 mm |
620 mm |
ISO 4706 / EN 1442 |
|
LPG-15KG |
35.5 L |
15.0 kg |
3.0 mm |
360 mm |
670 mm |
ISO 4706 / EN 1442 |
|
LPG-20LB |
4.7 gal |
8.0 kg |
2.3 mm |
305 mm |
445 mm |
DOT-4BA / TC-4BAM |
Material Specifications & Metallurgical Traceability
Cylinder integrity begins with the raw steel coil. We do not use uncertified secondary stock.
Plate Material: Killed carbon steel sheet grades HP295 or SG295 (sourced directly from tier-one mills with mill test certificates confirming low sulfur and phosphorus limits to prevent weld cracking).
Collar & Footring: Cold-rolled carbon steel (>= 1.5 mm thickness) stamped for structural impact resistance and welded continuously or multi-point spot-welded with high shear strength.
Valve Boss (Bung): Hot-forged low-carbon steel (20# steel), precision CNC-machined to guarantee thread pitch tolerance (parallel or tapered threads per regional standard) and checked with thread ring gauges.
Manufacturing Process, Visual Inspection & Quality Control
Our production line operates under strict pressure vessel manufacturing controls to eliminate structural flaws.
Blanking & Deep Drawing: Hydraulic presses form the upper and lower cylinder halves from circular steel blanks with controlled thinning at the sidewalls.
Welding Sequence:
Circumferential seam welding performed using automatic gas metal arc welding (GMAW / MIG) or submerged arc welding (SAW) inside a controlled fixture.
Weld penetration verified via radiographic testing (RT) or ultrasonic testing (UT) on sample batches.
Thermal Stress Relief: Formed and welded shells undergo normalization heat treatment in a continuous roller-hearth furnace (650°C +/- 20°C) to eliminate residual stresses induced by cold drawing and welding.
Surface Preparation: External surfaces undergo automated centrifugal shot blasting to achieve an Sa 2.5 surface cleanliness profile, maximizing powder coating adhesion.
Electrostatic Coating: Thermosetting polyester powder coating applied electrostatically and cured at 200°C, delivering a dry film thickness of 80 to 120 microns resistant to salt spray (500+ hours ASTM B117).
Valve Installation: Automated torque-controlled screwing with PTFE thread sealant, followed by pneumatic leak testing underwater at 1.5 MPa.
Testing & Mandatory Compliance
Every production lot undergoes verification before issuance of the Certificate of Conformity (CoC).
Hydrostatic Pressure Test: Tested at 1.5x maximum working pressure (typically 3.0 MPa to 3.2 MPa) held for a minimum of 30 seconds with zero permanent volumetric expansion exceeding regulatory limits.
Burst Test: One cylinder per heat treatment batch (1 out of every 200) subjected to hydraulic burst testing to verify ultimate tensile strength and ductile failure mode.
Third-Party Inspection (TPI): Inspection reports available upon request from accredited inspection bodies including TÜV, SGS, and Bureau Veritas.
Stamping Compliance: Permanent cold-stamped data on the cylinder collar or footring including: Standard designation, serial number, water capacity, tare weight, test pressure, manufacture date, and inspector's stamp.
Application & Operational Context
Designed for integration into commercial LPG supply chains:
Primary Distribution: Filling plants operating automated carousel or rotary filling lines. The collar geometry is dimensioned to fit standard conveyor handling systems and automated depalletizers.
Storage & Transport: Footring design incorporates drainage slots to prevent moisture accumulation during outdoor staging or open-deck truck transport.
End-User Interface: Compatible with standard clip-on, screw-on, or POL pressure regulators utilized across residential kitchens and heating units.
Frequently Asked Questions
Q: What international design codes and manufacturing standards do your cylinders meet?
A: Our production lines are certified to ISO 4706 (Welded steel gas cylinders), EN 1442 (Transportable refillable welded steel cylinders for LPG), and DOT-4BA specifications. We supply the relevant design review certificates and third-party manufacturing inspection reports with every shipment.
Q: Can you customize the cylinder collar, footring, and exterior color to match our brand?
A: Yes. We support OEM/ODM customization. You can specify the collar cutout design, company name or logo embossed/stamped on the collar or footring, and the exact RAL color code for the exterior electrostatic powder coating. Minimum Order Quantities (MOQ) apply for custom tooling changes.
Q: What is the standard packaging method for container shipping?
A: Cylinders are typically shipped bare in 20ft or 40ft General Purpose (GP) containers to maximize cubic capacity. To prevent paint scratching during ocean transit, cylinders are loaded with protective plastic mesh sleeves or stacked securely with rubber interlayers upon request.
Q: How do you verify the integrity of the circumferential weld seam?
A: Circumferential welds are executed via automated MIG welding machines with monitored wire feed and voltage parameters. Quality control includes destructive tensile/bend testing per batch and non-destructive radiographic (X-ray) testing in accordance with ISO/EN sampling rules.
Q: What documentation is provided for customs clearance and regulatory compliance?
A: Each shipment includes:
Commercial Invoice, Packing List, and Bill of Lading
Mill Test Certificates (MTC) for the raw steel coils
Batch Hydrostatic Test Reports
Third-Party Inspection Certificate (TÜV/SGS/BV if mandated by contract)
Certificate of Origin (Form A, CO, etc.)
Request a Technical Quotation / RFQ
To generate a precise quotation for your distribution network, please provide the following parameters in your inquiry:
Target Capacity: (E.g., 10kg, 12.5kg, 15kg, or water capacity in liters).
Design Standard: (ISO 4706, EN 1442, DOT-4BA, or local national standard).
Valve Requirement: (Thread type, regional valve model, or customer-supplied valve integration).
Order Volume: (Container load breakdown: 20ft GP or 40ft GP).
Destination Port: (For maritime freight estimation and customs documentation planning).
Direct Engineering Inquiries: Our technical sales team responds within 24 business hours with complete dimensional drawings and compliance verification files.
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