What gases can the CNG-350 be used with?

Breathing air, nitrogen and other industrial gases — specify the gas medium when ordering.

How much lighter is the CNG-350 than a steel cylinder?

At 94 kg the CNG-350 weighs roughly a third of an equivalent steel cylinder of the same water capacity.

What is the service life of the CNG-350?

20–30 yr, tested per ISO 11439 / ECE R110.

Can the CNG-350 be ordered at a lower safety factor than 3.0?

Yes. Catalog ratings use a burst safety factor of 3.0; for R&D and qualification-by-project programs the same structure is quoted at customer-selected safety factors (e.g. SF 2.5, SF 2.25, SF 2.0) with the working pressure derived as burst ÷ SF — ordered as CNG-350-SF2.5 and so on. Derived ratings are engineering configurations, not certified ratings.

Catalog › CNG › CNG-350Deutsche Version →

CNG-350 — 350 L CNG composite cylinder, 250 bar

CNGDEV

In development — technical inquiry welcome

The CNG-350 is a 350 L Type IV composite CNG cylinder rated at 250 bar (3600 psi) for vehicle and transport natural-gas storage aligned with EN ISO 11439 / ECE R110, weighing 94 kg.

Part No.	Volume	Pressure	Ø Dia	Length	Weight	H₂ / Grav.	Approvals	Lifespan
CNG-350	350 L21,358 cu in	250 bar3,600 psi	536 mm21.1 in	2045 mm80.51 in	94.00 kg207.23 lb	—	CNGDEV	20–30 yr

Safety factor WP = burst ÷ SF · derived ratings are not certified

250 bar · 3,600 psi

Part number	CNG-350
	Metric	Imperial
Working pressure	250 bar	3,600 psi
Burst pressure (3 × WP)	750 bar	10,800 psi
Water volume	350 L	21,358 cu in
Diameter	Ø 536 mm	Ø 21.1 in
Length	2045 mm	80.51 in
Weight	94.00 kg	207.23 lb
Temperature range	−40 to +60 °C	−40 to +140 °F
Threads	M18×1.5 · 17E · 25E · 3/4″-16 UNF · 5/8″-18 UNF · M12×1 · others on request
Qualification	ISO 11439 / ECE R110
Service life	20–30 yr

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R&D configurations — reduced safety factor

Catalog ratings use a burst safety factor of 3.0 (burst = 3 × working pressure). For R&D, space and qualification-by-project programs, the same structure can be operated at a customer-selected safety factor: the burst pressure of 750 bar is fixed by the structure, and the working pressure is derived as WP = burst ÷ SF. Derived ratings are engineering references — CE/π certification applies at SF 3.0 only.

Safety factor	Part number	Working pressure (metric)	Working pressure (imperial)	Rating
SF 3.0	CNG-350	250 bar	3,600 psi	Catalog — certified rating
SF 2.50	CNG-350-SF2.5	300 bar	4,300 psi	Engineering configuration — not certified
SF 2.25	CNG-350-SF2.25	333.3 bar	4,800 psi	Engineering configuration — not certified
SF 2.0	CNG-350-SF2	375 bar	5,400 psi	Engineering configuration — not certified

Click a configuration to select it — the drawing caption, specification and the request buttons above will reference that exact configuration.

Any factor from 1.5 to 10 can be configured in the catalog R&D view — quotes carry the -SF suffix automatically.

Related CNG cylinders

CNG-195 CNG-120 CNG-100 CNG-080

Frequently asked questions

What gases can the CNG-350 be used with?: Breathing air, nitrogen and other industrial gases — specify the gas medium when ordering.
How much lighter is the CNG-350 than a steel cylinder?: At 94 kg the CNG-350 weighs roughly a third of an equivalent steel cylinder of the same water capacity.
What is the service life of the CNG-350?: 20–30 yr, tested per ISO 11439 / ECE R110.
Can the CNG-350 be ordered at a lower safety factor than 3.0?: Yes. Catalog ratings use a burst safety factor of 3.0; for R&D and qualification-by-project programs the same structure is quoted at customer-selected safety factors (e.g. SF 2.5, SF 2.25, SF 2.0) with the working pressure derived as burst ÷ SF — ordered as CNG-350-SF2.5 and so on. Derived ratings are engineering configurations, not certified ratings.