Oxygen Tank Size Chart: Complete Guide to Oxygen Cylinder Sizes, Capacity, Dimensions & Duration

The use of a proper oxygen tank is important for proper, uninterrupted oxygen therapy and also for industrial uses. Oxygen cylinders have different size options, like small portable tanks that easily fit in a carrying bag and larger static cylinders that are commonly used in the welding industry, hospitals, and for manufacturing purposes. Each cylinder size comes with different oxygen capacity, dimensions, weight, and oxygen supply with different flow rates.

This detailed article will cover different oxygen tank size charts for cylinder sizes, capacity, and weight, as well as dimensions. So let’s get started.

Table of Contents

What are oxygen tanks?

Oxygen tanks are metallic cylinders that store oxygen or compressed air. It is used for oxygen therapy. Oxygen tanks are best used for lung conditions and also make breathing easy for proper body functioning.
Oxygen comes in gas or liquid form; further, tanks come in different sizes, such as larger sizes, but their shifting is difficult; that is used at hospitals or homes.
Others are small-sized and can be easily carried; we can also get oxygen through a plastic mask fitted on the mouth and nose.

Different oxygen tanks types

Oxygen tanks come in different types, and each has its own features.

Compressed oxygen

We breathe atmospheric air that comes with 20 per cent oxygen. The remaining part has nitrogen, with a small quantity of different gases.
Compressed oxygen gas has 99.5% oxygen. The oxygen tank comes with a gauge on the upper side that indicates the amount of gas remaining in it.
A regulator helps to breathe through compressed oxygen during inhalation and stops when exhaling.

Liquid oxygen

Liquid oxygen comes with 100 per cent oxygen in the form of cold liquid. Oxygen is converted into liquid at -297 degrees Fahrenheit.
Manufacturers compress it into a liquid oxygen tank, which releases oxygen from the tank, converted into gas. We should be careful with liquid oxygen. Mistakenly exposing the result of cryogenic burning

Oxygen concentrator

This oxygen cylinder provides purified air by separating polluted air, compressing oxygen, and removing nitrogen. It works over electric power that connects to a wall or employs batteries.
Compared to compressed oxygen or liquid oxygen, not require a refill tank to get oxygen

Standard Oxygen Tank Size Chart

Tank Size	Capacity (Liters)	Capacity (Cu Ft)	Height	Diameter	Empty Weight	Use
M2	40 L	1.4 cu ft	13 in	2.5 in	2.5 lb	Emergency backup
M4	113 L	4 cu ft	14 in	3 in	4 lb	Portable oxygen
M6	170 L	6 cu ft	17 in	4 in	5 lb	Travel
M9 (C)	255 L	9 cu ft	20 in	4.25 in	6 lb	Home & travel
D	425 L	15 cu ft	17 in	4.3 in	8 lb	Ambulances
E	680 L	24 cu ft	25 in	4.3 in	14 lb	Home oxygen
M22	622 L	22 cu ft	23 in	4.4 in	12 lb	Portable reserve
G	5,300 L	190 cu ft	55 in	9 in	60 lb	Clinics
H/K	6,900 L	244 cu ft	51 in	9.25 in	120 lb	Hospitals

Oxygen Tank Dimensions Chart

Tank Size	Height	Diameter
M2	13 in	2.5 in
M4	14 in	3 in
M6	17 in	4 in
M9	20 in	4.25 in
D	17 in	4.3 in
E	25 in	4.3 in
M22	23 in	4.4 in
G	55 in	9 in
H	51 in	9.25 in

Oxygen Tank Capacity Chart

Tank Size	Oxygen Capacity (L)	Cubic Feet
M2	40	1.4
M4	113	4
M6	170	6
M9	255	9
D	425	15
E	680	24
M22	622	22
G	5,300	190
H	6,900	244

Oxygen Tank Duration Chart

Tank Size	1 LPM	2 LPM	3 LPM	5 LPM
M6	170 min	85 min	57 min	34 min
M9	255 min	128 min	85 min	51 min
D	425 min	213 min	142 min	85 min
E	680 min	340 min	227 min	136 min
G	5,300 min	2,650 min	1,767 min	1,060 min
H	6,900 min	3,450 min	2,300 min	1,380 min

Oxygen Cylinder Pressure Chart

Status	Pressure (PSI)
Empty	0–200
Low	200–500
Half Full	1,000
Three-Quarter Full	1,500
Full	2,000–2,200

Oxygen Tank Size vs Weight

Tank Size	Capacity	Weight
M2	40 L	2.5 lb
M6	170 L	5 lb
M9	255 L	6 lb
D	425 L	8 lb
E	680 L	14 lb
G	5,300 L	60 lb
H	6,900 L	120 lb

US vs International Oxygen Cylinder Sizes

US Size	International Equivalent
M2	0.4 L cylinder
M4	1 L cylinder
M6	1.5 L cylinder
M9	2 L cylinder
D	2.5–3 L cylinder
E	4–5 L cylinder
G	40 L cylinder
H	47–50 L cylinder