The Main Types of Medical Gases in a Hospital and Where Each Is Used

A medical gas system in one paragraph

A medical gas system is the combination of sources, pipework, control valves, alarms and wall or ceiling terminal units that deliver gases and vacuum to the point of care. Its design aim is continuity and purity: the right gas, at the right pressure, without interruption. The list of services is defined by the clinical areas the hospital operates.

To see how the parts fit together, read medical gas pipeline system components. Here we concentrate on the gases themselves.

Oxygen, nitrous oxide and medical air

Oxygen is the most widely used gas: respiratory support, anaesthesia, resuscitation and neonatal care. It may come from liquid tanks, cylinder manifolds or an on-site plant; the MIL's oxygen concentrators from MZ Liberec, for example, use molecular sieves to produce 93–95% oxygen-enriched air in sizes from 3 to 48 Nm³/h of O₂. For supply logic see how hospitals get oxygen.

Nitrous oxide is used in anaesthesia and, in some departments, for analgesia, and is usually supplied from cylinder manifolds. Medical air is used to drive ventilators, power respiratory equipment and mix with oxygen; it is produced by compressor stations or supplied from cylinders, and its quality must be controlled. MIL's compressor stations offer outputs from 2.2 to 608 Nm³/h in oil-free or oil-lubricated, scroll or piston versions.

Surgical air, carbon dioxide, nitrogen and other gases

Surgical (tool) air is a higher-pressure supply that powers pneumatic surgical instruments and ceiling pendants in theatres. Carbon dioxide is used for insufflation in laparoscopic and other minimally invasive procedures and in some cryotherapy applications. Nitrogen is used as a driving gas for tools in some systems, and gas mixtures such as oxygen with helium or nitric oxide are normally handled at the bedside from dedicated cylinders rather than from the central pipeline.

Each hospital chooses its list from its specialities. A small clinic may only need oxygen, medical air and vacuum, while a surgical hospital also pipes surgical air and carbon dioxide.

Vacuum and anaesthetic gas scavenging

Medical vacuum is not a gas but an essential service, used for suctioning airways, wounds and operative fields. Plants must include exhaust filtration and secretion protection; the MIL's vacuum stations offer 6.4 to 632 Nm³/h with an antibacterial filter and a secretion trap. See medical vacuum system design for sizing logic.

Anaesthetic gas scavenging (AGSS) removes waste anaesthetic gases from the breathing circuit to protect staff and is a separate system from the vacuum plant. It is described in anaesthetic gas scavenging.

Quick reference by area

Terminal units can be delivered through bed head units, medical beams or ceiling pendants depending on the room.

• Operating theatre: oxygen, nitrous oxide, medical air, surgical air, vacuum, AGSS, often carbon dioxide.
• Intensive care and high dependency: oxygen, medical air, vacuum.
• Wards: oxygen, medical air in some designs, vacuum.
• Neonatal and maternity: oxygen, medical air, vacuum, and nitrous oxide in delivery suites in some practice.
• Emergency and resuscitation: oxygen, medical air, vacuum.

Safety, standards and next steps

Gas identity is protected by colour, labelling and non-interchangeable connectors, covered in the medical gas colour code. Design and testing follow recognised standards such as HTM 02-01 and ISO 7396-1, and facilities in the UAE should confirm current requirements with the relevant authority.

If you are defining the gas list for a new ward or theatre, Beckfinity can help match the services to MZ Liberec's medical gas programme; contact our specialists with your room schedule.