How Do Hospitals Get Oxygen? Liquid Tanks, Cylinder Manifolds and On-Site Plants

The supply logic: primary, secondary, reserve

Standards such as HTM 02-01 and ISO 7396-1 describe medical gas supply as a hierarchy. The primary source feeds the pipeline in normal operation. A secondary source takes over automatically if the primary fails or runs low. A reserve source is a smaller back-up that covers an emergency or maintenance of the other two, often with a manual or automatic start.

Alarm panels tell staff which source is feeding the pipeline and warn when the secondary or reserve is in use. The way the elements fit together is described in medical gas pipeline system components.

Liquid oxygen (LOX) tanks

Large hospitals frequently store liquid oxygen in a vacuum-insulated tank outside the building. The liquid is vaporised and its pressure regulated before it enters the pipeline. A tanker refills the tank on a scheduled basis, with telemetry or level monitoring to trigger deliveries.

LOX is attractive for high and continuous demand because one tank holds a lot of oxygen in a small footprint and the gas is of high purity. It needs a safe site with tanker access, protective distance from buildings and ignition sources, a vaporiser and a back-up. Delivery reliability, which depends on the supplier, becomes part of your risk plan.

Cylinder manifolds

A manifold connects banks of high-pressure cylinders to the pipeline through regulators and an automatic changeover. A typical arrangement has a duty bank, a standby bank and sometimes a reserve bank. Cylinders suit smaller hospitals, clinics and as a back-up for other sources.

Their drawbacks are manual handling, storage space, delivery frequency and the need to manage stock and cylinder safety. Fire prevention and handling training matter; see oxygen safety in hospitals.

PSA oxygen plants

A pressure swing adsorption plant produces oxygen on site from compressed air using molecular sieves, as explained in how an oxygen concentrator works. MZ Liberec's MIL's oxygen concentrators, for instance, give 93–95% oxygen-enriched air in six sizes, from 3 to 48 Nm³/h of O₂, as an on-site source for the hospital pipeline. According to the manufacturer, this gas may replace medical oxygen provided all required parameters are met.

The plant needs electricity, a plant room and regular maintenance, but removes dependence on deliveries. It is normally combined with a cylinder manifold or LOX as reserve. See the MIL's oxygen concentrators.

Liquid oxygen versus PSA, and how to choose

The cost comparison is developed in concentrator plant versus cylinders.

• Demand: very high continuous demand favours LOX; moderate to high steady demand favours PSA; low demand favours cylinders.
• Purity: LOX and cylinders supply around 99% or higher oxygen; PSA gives 93–95%, so confirm the clinical acceptance (see 93% versus 99% medical oxygen).
• Logistics: LOX and cylinders rely on deliveries; PSA relies on power and service.
• Capital and running cost: PSA has higher capital and lower recurring cost; cylinders the reverse.
• Resilience: combine at least two source types if possible.

Planning questions

Ask: what is our peak oxygen flow and number of ventilated beds? How long can we run on the reserve? What happens if a delivery is delayed or the power fails? Does the plant have standby power? Who maintains each source, and how quickly?

Regulation of medical devices and facilities in the UAE is the responsibility of authorities such as MOHAP, DHA and DOH, so confirm current requirements. Beckfinity can help you size an on-site source; contact our specialists.