Medical Oxygen Cylinder Sizes: A Guide to Sizes, Capacities, and Dimensions

Not all medical oxygen cylinders have the same capacity or dimensions. Understanding the differences between sizes makes it easier to choose equipment suited to your environment and needs.

Are you shopping for an oxygen cylinder for your business, clinic, dental office, or first aid equipment?

You have probably noticed that cylinders carry different designations: D, E, M6, M9, M24, and so on.

These names correspond to different cylinder categories, but they are not always used consistently by manufacturers.

So, what is the difference between a type D oxygen cylinder and a type E cylinder? How much oxygen does each size hold? And how do you determine which one is right for your needs?

Here is a practical guide to comparing the most common sizes.

Medical Oxygen Cylinder Size Comparison Chart

Medical oxygen cylinders are available in various sizes, ranging from small portable models to larger-capacity cylinders used in healthcare facilities.

The following table presents approximate specifications for common aluminum cylinder models used in North America.

This information is for reference only. Dimensions, rated capacity, and designations may vary by manufacturer, operating pressure, and market. Always consult the product specifications before purchasing.

Key takeaway: the letters used to identify cylinders are not universal. Two manufacturers may use the same designation for cylinders with different capacities. It is therefore best to compare their actual capacity in liters and their dimensions.

What is a Type D Oxygen Cylinder?

The type D oxygen cylinder offers a good balance between capacity and portability.

At Cardio Choc, the type D cylinder has a rated capacity of 425 liters of oxygen.

Its relatively compact size makes it easy to transport and store, making it a practical option for some first aid and emergency response equipment.

It may suit organizations that need portable equipment without necessarily requiring a large-capacity cylinder.

Cardio Choc offers, among other products:

• Full Type D Oxygen Cylinder — 425 L
• Complete Public Oxygen Therapy Kit — D Cylinder

Complete kits may include a filled cylinder, a regulator, masks, and transport accessories, depending on the selected configuration.

What is a Type E Oxygen Cylinder?

The type E cylinder has a larger capacity while remaining portable with suitable equipment.

The model offered at Cardio Choc has a rated capacity of 680 liters of oxygen.

Its main specifications are as follows:

• Capacity: 680 liters
• Approximate height: 64.5 cm (25.4 in)
• Approximate diameter: 11.1 cm (4.38 in)
• Empty weight: approximately 3.5 kg (7.8 lb), depending on configuration

This size is used in some medical and dental settings where a larger oxygen reserve may be needed.

Cardio Choc offers various options, including:

• Full Type E Oxygen Cylinder — 680 L
• Empty Type E Oxygen Cylinder
• Complete Oxygen Therapy Kit for Dentists — E Cylinder

Type D or E Cylinder: What Are the Differences?

The D and E cylinders offered by Cardio Choc differ primarily in capacity and size.

At 680 liters, the E cylinder contains about 60% more oxygen than the 425-liter D cylinder.

That does not automatically make it the best choice.

A larger cylinder takes up more space and may be less convenient to transport.

The right size depends on factors such as where it will be stored, the level of mobility required, the intended duration of use, and the regulator being used.

How Long Does an Oxygen Cylinder Last?

A cylinder's duration of use depends primarily on three factors:

1. The amount of usable oxygen in the cylinder.
2. The oxygen flow rate, expressed in liters per minute.
3. The remaining pressure and the reserve required.

For a theoretical estimate, you can use the following formula:

Estimated duration (minutes) = Usable oxygen volume (liters) ÷ Flow rate (liters per minute)

Example using a 425-liter D cylinder

Suppose you have a nominally full cylinder containing 425 liters of oxygen.

For purely mathematical purposes, at a constant flow rate of 5 liters per minute:

425 ÷ 5 = 85 minutes.

The theoretical duration would therefore be about 1 hour and 25 minutes, before accounting for the reserve and other possible losses.

This calculation is not a recommended flow rate or clinical guidance. The actual duration may be shorter depending on the remaining pressure, the equipment used, and the conditions of administration.

The amount of oxygen available to a patient must always be assessed in accordance with applicable protocols and the manufacturer's instructions.

How to Choose the Right Oxygen Cylinder Size

Choosing a cylinder should not be based on capacity alone.

Here are the main factors to consider.

1. Transport and portability

A smaller cylinder may be more convenient when it needs to be moved quickly.

A larger-capacity cylinder may be suitable when mobility is less important and a greater oxygen reserve is preferred.

2. The intended setting

The needs of a dental office may differ from those of a workplace first aid team or a healthcare facility.

Available space, storage conditions, and access to the equipment should all be taken into account.

3. Regulator compatibility

Not all cylinders necessarily have the same type of valve.

It is important to check that the cylinder and regulator are compatible before purchasing.

Cardio Choc offers, among other products, a 0 to 15 liters-per-minute oxygen regulator. Compatibility must be confirmed with the selected cylinder model and valve type.

4. Purchasing a complete kit

If you need several accessories, an oxygen therapy kit can make shopping easier.

Depending on the configuration, these kits include:

• An oxygen cylinder.
• A compatible regulator.
• Oxygen masks.
• Transport or storage accessories.

You can browse our selection of oxygen therapy equipment and accessories to compare the available options.

Frequently Asked Questions About Oxygen Cylinder Sizes

What is the difference between a D and an E oxygen cylinder?

At Cardio Choc, the D cylinder has a rated capacity of 425 liters, while the E cylinder holds 680 liters. The E cylinder therefore provides a larger reserve, but it is also bigger.

How much oxygen does a type E cylinder hold?

The E cylinder offered by Cardio Choc nominally holds 680 liters of oxygen when filled to its specifications. This capacity may vary among models offered by other manufacturers.

What are the dimensions of a type E oxygen cylinder?

The type E model offered by Cardio Choc is approximately 64.5 cm tall and 11.1 cm in diameter. Dimensions may vary depending on the manufacturer and valve used.

Is a D cylinder easy to transport?

Yes. Its compact size makes it easier to transport when suitable equipment is used. However, it is essential to properly secure any oxygen cylinder during transport and storage.

Are oxygen cylinder sizes standardized?

Not completely. Designations may vary by manufacturer and country. To compare two cylinders, it’s best to check their capacity in liters, dimensions, working pressure, and valve type.

Can you buy a complete oxygen therapy kit?

Yes. Cardio Choc offers various kits for certain professional and emergency response applications, including kits with D- and E-type cylinders.