Technical Specifications & Configuration Matrix

Engineered for portable medical gas delivery, our small medical cylinders are produced from high-purity raw materials using precision deep-drawing and CNC flow-forming techniques. Every cylinder conforms strictly to international safety standards for high-pressure gas containment.

Model Series	Material	Water Capacity (L)	Outer Diameter (mm)	Height (mm)	Working Pressure (bar)	Test Pressure (bar)	Standard Thread	Weight (kg)
MC-035	Aluminum 6061-T6	0.35	60	210	150	250	M18x1.5 / CGA 870	0.52
MC-075	Aluminum 6061-T6	0.75	89	230	150	250	M18x1.5 / CGA 870	1.10
MC-140	Aluminum 6061-T6	1.40	102	275	150	250	3/4-16 UNF	1.75
MC-200	Aluminum 6061-T6	2.00	111	310	150 / 200	250 / 300	3/4-16 UNF	2.40
MC-280	Aluminum 6061-T6	2.80	111	415	150 / 200	250 / 300	3/4-16 UNF	3.20
SC-140	34CrMo4 Steel	1.40	100	260	200	300	PZ 27.8 / CGA 540	2.85

Material, Metallurgy & Manufacturing Process

Structural reliability in high-pressure environments begins with material selection and controlled thermal processing.

Aluminum Alloy 6061-T6: Selected for excellent strength-to-weight ratios, natural corrosion resistance, and non-magnetic properties. Chemical composition strictly controlled to maintain uniform grain structure during extrusion.

Chrome-Moly Steel (34CrMo4): Utilized for higher pressure thresholds (200 bar to 300 bar) in compact steel configurations. Fully killed steel vacuum-degassed to eliminate non-metallic inclusions.

Hot Deep-Drawing & Flow Forming: Billets undergo controlled pre-heating followed by multi-stage deep drawing to form seamless cylinder bodies. Wall thickness is mechanically optimized via CNC flow forming to ensure uniform stress distribution under load.

Heat Treatment (Quenching & Tempering): Steel vessels undergo precise austenitizing, rapid quenching, and high-temperature tempering to achieve optimal yield-to-tensile strength ratios (>0.85).

Internal Shot Blasting & Passivation: Internal surfaces are mechanically cleaned via grit blasting and chemically passivated to remove particulate matter, ensuring compatibility with medical-grade oxygen (99.5% purity) and preventing valve contamination.

Quality Control, Testing & Regulatory Compliance

Every production batch undergoes destructive and non-destructive testing mandated by international pressure vessel codes.

Hydrostatic Pressure Testing: 100% of cylinders are subjected to water jacket testing at test pressure (TP) for a minimum of 30 seconds to verify permanent volumetric expansion remains below the allowable limit (<10%).

Burst Pressure Testing: Destructive batch testing conducted at 2.5x working pressure to verify ultimate tensile strength and ductile failure mode.

Cycle Fatigue Testing: Samples tested under cyclical pressure impulses from 0 bar to working pressure for 12,000+ cycles to simulate multi-year refilling lifecycles.

Ultrasonic & Eddy Current Inspection: Automated scanning detects wall thickness anomalies, internal laminations, and surface micro-cracks.

Certifications:
DOT-3AL / TC-3ALM (North American Market)
ISO 7866 / EN 1975 (European Aluminum Cylinder Standard)
ISO 9809-1 / EN 1964-1 (European Steel Cylinder Standard)
CE Marking under Pressure Equipment Directive (PED 2014/68/EU)

Valve Integration & Accessory Compatibility

Selecting the correct cylinder requires matching thread configurations and valve types to target delivery systems.

Valve Options: Post valves, pin-index valves, integrated pressure regulator valves (IPRV), and residual pressure valve devices (RPVD) equipped with safety burst discs.

Thread Specifications:
• Inlet threads: 3/4-16 UNF, M18x1.5, 25E.
• Outlet connections: CGA 870 (Yoke), CGA 540 (Nut & Nipple), Pin Index Medical Yoke (CGA 880/910), DIN 477, BS 341.

Surface Protection & Finishing: Electrostatic powder coating or clear anodizing. Standard finishes withstand salt spray corrosion testing (ASTM B117) for over 500 hours without blistering.

Application Guidance & Deployment Contexts

Emergency Medical Services (EMS): Lightweight aluminum cylinders (MC-140 to MC-200) integrated with click-style flow regulators for rapid deployment in trauma bags and stretcher mounts.

Home Oxygen Therapy: Compact volumes paired with lightweight carrying bags and trolley carts, enabling ambulatory mobility for patients requiring continuous or pulse-dose oxygen therapy.

Portable Medical Device OEM: Custom bare cylinders supplied to medical device manufacturers for integration into automated external defibrillator (AED) oxygen support kits and transport ventilators.

Frequently Asked Questions

Q: What is the standard retest interval for aluminum and steel medical gas cylinders?

A: Retest intervals are governed by local regulatory authorities. For DOT-certified cylinders, aluminum cylinders (3AL) typically require hydrostatic retesting every 5 years. For ISO/CE certified cylinders, inspection intervals generally follow national standards (ranging from 5 to 10 years), marked clearly on the cylinder shoulder stamp.

Q: Can cylinders be supplied pre-assembled with medical valves?

A: Yes. We offer factory-level valve installation using automated torque control and oxygen-compatible thread sealant. All assembled units undergo 100% helium leak testing before packaging.

Q: What is the minimum order quantity (MOQ) for custom-branded or custom-colored cylinders?

A: For standard stock configurations (mill finish aluminum with standard neck threads), MOQ starts at 500 units. For custom powder-coated colors, silk-screened laser labeling, or specific thread requirements, MOQ is 1,000 units per batch.

Q: What documentation is provided with a commercial shipment?

A: Each shipment includes the Mill Test Certificate (MTC) detailing chemical composition and mechanical test results, Batch Hydrostatic Test Reports, and copies of relevant regulatory certificates (DOT/TC/CE).

Request Technical Specification Package & Commercial Quotation

To evaluate sample units or discuss bulk procurement contracts, provide your volume requirements, target standards (DOT vs. ISO), and valve preferences below.

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