Medical Gas Cylinders: Technical Procurement Guide & Product Specifications
Product Overview & Technical Selection
Medical gas cylinders are critical pressure vessels engineered for the safe storage and transport of high-purity medical gases (Oxygen, Nitrous Oxide, Carbon Dioxide, Medical Air) across clinical, emergency, and homecare environments.
To match specific clinical mobility and capacity requirements, cylinders are categorized by material, volume, and pressure rating.
|
Material |
Standard Capacity (Water Volume) |
Working Pressure |
Applicable Standards |
Primary Application |
|
Aluminium Alloy (6061-T6) |
0.35L to 10L (Portable) |
150 bar / 200 bar (2216 psi / 3000 psi) |
DOT-3AL, ISO 7866, EN 1975 |
Ambulances, Homecare Oxygen, Portable EMS |
|
Aluminium Alloy (6061-T6) |
10L to 40L (Large) |
150 bar / 200 bar |
DOT-3AL, ISO 7866, EN 1975 |
Clinics, Outpatient Facilities |
|
Seamless Steel (34CrMo4) |
10L to 50L (High Capacity) |
150 bar / 200 bar / 300 bar |
ISO 9809-1, EN 1964-1, DOT-3AA |
Hospital Central Piping, Bulk Storage |
Material & Manufacturing Process
Structural integrity and internal surface cleanliness directly impact medical gas purity. Our manufacturing workflow adheres strictly to medical device quality management systems.
Raw Material Selection:
Aluminium cylinders forged from high-purity AA 6061-T6 billets, delivering superior corrosion resistance and high strength-to-weight ratios.
Steel cylinders manufactured from 34CrMo4 alloy steel ingots, featuring optimized chromium and molybdenum content for enhanced tensile strength and toughness.
Deep Drawing & Hot Spinning:
Precise billet piercing and backward extrusion form seamless cylinder bodies with uniform wall thickness.
Automated CNC hot spinning shapes the cylinder neck, maintaining strict concentricity and thread alignment tolerances.
Heat Treatment:
Full-body quenching and tempering processes relieve residual stress, ensuring homogeneous microstructures and mechanical performance across every production batch.
Internal Surface Treatment:
Abrasive blasting and chemical passivation create an oxide layer inside aluminium cylinders, preventing particulate contamination and oxidation of medical oxygen.
Quality Control & Mandatory Testing
Every production lot undergoes rigorous destructive and non-destructive testing to satisfy international pressure equipment directives and medical standards.
Hydrostatic Pressure Test: 100% of cylinders are pressurized to 1.5 times the working pressure to verify volumetric expansion and permanent elongation limits.
Burst Test: Conducted on sample cylinders per batch to confirm ultimate burst pressure exceeds regulatory safety margins (typically greater than 2.5 times working pressure).
Tensile & Impact Testing: Destructive verification of mechanical properties (yield strength, elongation, Charpy V-notch impact test at specified temperatures).
Internal Cleanliness & Thread Inspection: Automated optical inspection checks thread pitch diameters (CGA, M22, G5/8, UNF) and ensures internal freedom from oil, moisture, and debris.
Traceability: Heat numbers, serial numbers, tare weight, and water capacity are permanently cold-stamped on the cylinder shoulder.
Compliance & Certifications
Our manufacturing facilities and cylinder products comply with global regulatory frameworks for medical devices and pressure vessels:
Quality Management: ISO 13485 (Medical Devices), ISO 9001 (Quality Management).
Product Standards:
• North America: DOT-3AL / DOT-3AA compliant.
• Europe & International: ISO 7866 (Aluminium), ISO 9809-1 (Steel), TPED (2010/35/EU) with pi mark, CE 0036/0062.
Valve Configuration & Customization
Cylinders can be pre-fitted with certified medical valves and accessories according to regional standards:
Valve Inlet Threads: 3/4-16UNF, 25E, PZ27.8.
Outlet Connections: CGA 540 (High-pressure Oxygen), CGA 870 (Yoke type for portable cylinders), DIN 477 No. 6, BS 341 No. 3.
Optional Accessories: Integrated pressure regulator (Pin-index or click-style flowmeter), protective plastic or aluminium caps, customized corporate logos, and durable powder-coat exterior finishes (Medical Green, White, or custom RAL colors).
Request for Quotation (RFQ) Guidelines
To accelerate your technical review and quotation process, please provide the following specifications in your inquiry:
Gas Type: (E.g., Medical Oxygen, Air).
Standard / Certification: (E.g., DOT-3AL, TPED / ISO 7866).
Water Capacity & Quantity: (E.g., 10L aluminium, 500 units initial order).
Valve Type & Inlet Thread: (E.g., CGA 540 with 3/4-16UNF inlet).
Destination Port / Incoterms: (E.g., FOB Shanghai / CIF Los Angeles).
Engineering drawings, material test reports (MTRs), and sample evaluation requests are available upon direct application to our technical sales team.
Frequently Asked Questions
Q: What is the difference between DOT-3AL and ISO 7866 aluminium medical gas cylinders?
A: DOT-3AL is the mandatory specification issued by the US Department of Transportation for aluminium cylinders used in North America, requiring specific alloy compositions and strict cyclical retesting protocols. ISO 7866 is the international standard for seamless aluminium alloy gas cylinders recognized under TPED for the European market. Both standards dictate rigorous burst and pressure testing, but their dimensional tolerances and marking requirements differ.
Q: What is the standard retest interval for medical oxygen cylinders?
A: Retest intervals vary by regional regulation and cylinder standard. For DOT cylinders in the US, aluminium cylinders (DOT-3AL) generally require retesting every 5 years. Under European TPED regulations, seamless steel and aluminium cylinders typically carry a 5-year periodic inspection and hydro-test interval, subject to local statutory authority rules.
Q: Are the cylinders shipped charged (with gas) or empty?
A: For international ocean and air freight safety compliance, all medical gas cylinders are shipped empty (depressurized) with residual air or inert gas holding to maintain internal cleanliness, unless specific bulk regional delivery arrangements are contracted.
Q: What is your standard Minimum Order Quantity (MOQ) for custom-branded cylinders?
A: For standard stock configurations, MOQs start at 100 units per size. For custom powder-coat colors, stamped client logos, or dedicated valve integrations, MOQ is typically 500 units per specification batch to align with forging and coating line setups.
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