A hospital oxygen plant makes medical oxygen on site from air, at 93% ± 3% purity, and pipes it to every bed through the medical gas pipeline. A 100-bed hospital typically needs a plant of about 7 Nm³/hr (around 125 LPM), with a cylinder manifold as backup. Most hospitals recover the cost in 12–18 months compared with buying cylinders or liquid oxygen.
This guide covers what a hospital oxygen plant is, how to size one, the standards it must meet, the supply designs that keep oxygen flowing during a fault, and what it costs.
Why hospitals move to on-site oxygen
Oxygen is used across a hospital: ICUs and CCUs, operation theatres, ventilators, emergency, neonatal care, wards and respiratory therapy. When the supply depends on trucks and cylinder vendors, any delay reaches the patient.
An on-site PSA plant removes that dependency:
- Continuous supply: oxygen is produced 24×7, with no refill schedule or vendor delays.
- Lower cost: no cylinder rental, transport or handling, and no annual price hikes.
- Safety: the plant stores oxygen at about 5.5 barg, far below the 150 barg in cylinders.
- Less handling: no cylinders moving through corridors and wards.
- Lower emissions: no delivery trucks.
How a hospital oxygen plant works
A medical oxygen plant uses pressure swing adsorption. Compressed, dried and filtered air passes through towers of zeolite molecular sieve, which trap nitrogen and let oxygen through. Two towers alternate, so oxygen flows without interruption. An online oxygen analyser checks purity continuously and raises an alarm if it drifts.
The oxygen goes into a receiver and then into the hospital’s medical gas pipeline system (MGPS), which delivers it to each bed outlet. For a full explanation of the process, read the PSA oxygen generator engineering guide.
How to size an oxygen plant for a hospital
Size the plant from the oxygen each area of the hospital actually uses, not from the bed count alone. An ICU bed on a ventilator uses far more than a general ward bed.
- List beds by type: ICU, HDU, OT, emergency, wards.
- Estimate flow per bed type in litres per minute (LPM). Our guide on calculating the total oxygen required in hospitals gives typical values.
- Add up the peak flow and apply a diversity factor, since not every bed draws at once.
- Convert to plant size: 1 Nm³/hr is about 16.7 LPM, so 125 LPM needs a plant of about 7.5 Nm³/hr.
- Plan for growth: new ICU beds or a new wing change the numbers.
If the hospital uses cylinders today, its current consumption is a useful check. See how to calculate hospital oxygen requirement from cylinders or liquid oxygen.
Example: a 100-bed rural hospital installed a MedO 7 system supplying 125 LPM. It now produces all its own oxygen instead of buying cylinders from several suppliers.
Standards and certifications
Medical oxygen from a PSA plant must meet the pharmacopoeia standard for 93% oxygen, and the plant should come from a manufacturer certified for medical devices.
| Standard | What it covers |
|---|---|
| Pharmacopoeia (Indian, US, European) | Oxygen 93% ± 3%, the purity accepted for PSA medical oxygen |
| WHO guidance | PSA oxygen for patients should be at least 93% oxygen |
| ISO 13485 | Quality management for medical devices: design, production, installation and service |
| ISO 9001 | The manufacturer’s general quality management |
Absstem’s MedO plants are ISO 13485:2016 certified by TÜV Nord and deliver 93–96% purity, with an online analyser on every plant.
Supply design: primary, backup and emergency
No hospital should rely on a single oxygen source. A good design has three layers, so oxygen keeps flowing during maintenance or a power cut.
- Primary: the PSA oxygen plant feeds the pipeline directly.
- Backup: a cylinder manifold connected through an automatic changeover panel. If the plant faults, supply switches over without anyone touching a valve.
- Emergency reserve: cylinders kept full and ready. A booster compressor can refill them from the PSA plant at 150 barg, so the hospital never runs out of filled cylinders.
Audio-visual alarms warn staff of any fault, and IIoT monitoring lets the service team see the plant’s condition remotely. For a comparison of supply options by facility type, read selecting the right oxygen delivery system for your hospital.
Cost and payback
The main running cost of a PSA plant is electricity for the air compressor. Medical oxygen from a PSA plant costs a fraction of cylinder oxygen, and most hospitals see payback in 12–18 months.
Example: a city hospital installed a MedO 12.5 plant to end recurring shortages. It now has round-the-clock oxygen, has cut its oxygen costs substantially, and recovered its investment within about 15 months.
To estimate your own numbers:
- Medical oxygen plant setup cost in India
- ROI of a PSA medical oxygen generator vs liquid oxygen and cylinders
- The free ROI calculator
Choosing a medical oxygen plant manufacturer
Check these before you buy:
- Certification: ISO 13485 for medical devices, not only ISO 9001.
- Purity proof: an online analyser and a test report showing 93% ± 3%.
- References: working plants in hospitals similar in size to yours.
- Service network: response time for breakdowns, and spare parts in India.
- Warranty: especially on the molecular sieve, the core of the plant.
- Life: a well-maintained plant should run for at least 10 years.
Maintenance
Routine maintenance keeps purity steady and the plant running for 10 years or more: filter changes, compressor and dryer servicing, and periodic checks of valves and the analyser. Absstem Shield provides AMC and CMC for hospital oxygen plants of any brand, with remote monitoring and breakdown support.
Talk to us about your hospital
See MedO medical oxygen generators or oxygen solutions for healthcare. Email info@absstem.com or call 1800 547 0506 for a plant sized to your beds.