What counts as a hyperbaric facility?
The term covers several very different installations: clinical hyperbaric oxygen treatment chambers in hospitals, decompression and diving-support chambers, research chambers and specialised industrial pressure environments. Each has its own safety case, standards and approval route.
What they share is that people may be inside a pressurised space, and the air system directly affects their safety. That is why the supply must be engineered as part of the facility, not bought as a stand-alone compressor. Clinical treatment protocols, oxygen systems, decompression schedules and rescue procedures are matters for qualified specialists and are outside the scope of a compressor supplier.
A statement such as “8 bar compressor suitable for hyperbaric chambers” should never appear in a quotation. Suitability depends on the whole installed system.
Which air duties does a chamber need?
A single facility may need several distinct air services. The designer must say which one the proposed equipment is for, because the quality, reliability and approval requirements differ.
| Air duty | Key question | Who decides |
|---|---|---|
| Chamber pressurisation air | What quality, pressure and flow does the chamber maker specify? | Chamber maker and facility designer |
| Breathing supply | Which breathing-gas standard and testing regime apply? | Clinical or diving technical authority |
| Ventilation air | What flow keeps the chamber atmosphere within limits during treatment? | Facility designer |
| Instrument and control air | Can loss or contamination cause an unsafe chamber response? | Controls and safety designer |
| Temporary or standby air | How is equivalence proven and how is changeover controlled? | Facility designer and operator |
Never assume one header can serve several duties. If a shared source is proposed, the designer must assess cross-connection risk and common-cause failure explicitly.
Drawing the battery limits
Map the actual path from air intake to chamber inlet: intake, compressors, aftercoolers, separators, dryers, filters, any purification stages, receivers, relief devices, regulators, monitors, isolation valves, distribution pipework and sampling points. Give each item a tag and a physical location.
For every tag, record the design pressure, operating range, material, cleanliness requirement, gas identity, flow reference condition and who owns its testing and maintenance. A compressor supplier whose scope ends at a flange cannot close a facility-level risk by saying so.
- Agree an interface document signed by the chamber maker, facility designer, compressor and treatment suppliers, pipework contractor, controls integrator and operator.
- Replace every “by others” note with a named party, a deliverable and a date.
- Keep one controlled revision register so drawings do not conflict.
Gas identity and contamination risks
Ordinary compressed air, medical air, breathing air, oxygen-enriched gas and control air are not interchangeable. Oxygen service brings its own cleaning, material-compatibility and fire-safety requirements that are entirely outside ordinary compressor selection. Industrial air must never be connected to a breathing or oxygen-designated system without approved engineering.
The designer sets which contaminants matter and their limits. Typical sources to consider include:
- Engine exhaust and carbon monoxide drawn in at the intake.
- Oil aerosol and vapour from the compressor or from pipework residues.
- Water and particles, including breakthrough from dryers or filters.
- Cleaning solvents and maintenance materials.
- Microbial growth where relevant to the duty.
Air-quality evidence must represent what reaches the chamber, not just what leaves the compressor. Piping, valves, regulators, receivers and later maintenance can all change quality, so sampling points must be designed in where representative samples can be taken.
Intake siting: the most overlooked design input
A compressor can only deliver air as clean as the air it draws in. Survey the intake location for nearby diesel generators, ambulance bays and vehicle routes, boiler flues, fuel storage, laboratory and workshop exhausts, waste areas and HVAC discharges.
In Indian hospitals and campuses, standby diesel generators often run during grid outages, and construction or road traffic can change from week to week. Wind direction shifts with the season. A sample taken on one quiet day does not prove the intake is safe when the generator is running or a delivery vehicle idles nearby.
- List every possible contamination source with its distance and direction from the intake.
- Note when each source operates, including emergency and maintenance activity.
- Decide, with the designer, whether relocation, ducting, separation or monitoring is needed.
- Record the decision in a contamination risk register with a named reviewer.
- Where evidence is missing, hold the supply qualification rather than adding an arbitrary margin.
Pressure definitions and the pressure budget
State every pressure as gauge or absolute and say where it is measured. Chamber pressure is often stated as gauge above local atmosphere, while compressor performance may be assessed in absolute terms. Mixing the two causes errors.
For a first pressure budget, the required compressor discharge pressure equals the approved chamber-side supply pressure plus the verified losses across treatment equipment, receivers, piping, isolation valves, regulators and control devices at the governing flow. This is a boundary calculation to size the supply. It is not an instruction for chamber pressurisation.
The chamber designer alone sets pressurisation rates, control set points and relief arrangements. A compressor’s maximum working pressure is an equipment limit; it never defines a safe chamber operating pressure.
Flow, storage and reliability
Air demand must be defined for each operating state: initial pressurisation, steady treatment with ventilation, recovery, and emergency conditions. For each, the designer gives duration, pressure, temperature, gas identity and the reference conditions for volume. Free air delivery at the compressor inlet, standard volume and chamber-side volume are different quantities and must not be confused.
Reliability is usually as important as capacity. Consider:
- Duty and standby compressors with automatic changeover, as specified by the designer.
- Receiver or reserve storage sized for the emergency case the designer defines.
- Power supply resilience, including generator back-up and restart behaviour after an outage.
- Alarms for low pressure, high dew point, high temperature and treatment faults, routed to the operator.
- Cooling and ventilation of the compressor room, which matters in Telangana and Andhra Pradesh summers when ambient temperatures can reach 45 °C.
Commissioning, testing and maintenance
Commissioning follows the facility’s approved procedure. From the air-supply side, it normally includes cleanliness checks of new pipework, leak testing, verification of dryer dew point and filter performance, alarm and changeover tests, and air-quality sampling at the designated points under representative operating conditions.
After handover, maintenance must keep the system in its approved configuration. Filter elements, dryer media, compressor oils and spare parts should match the approved specification. A like-for-like replacement can still change temperature, pressure, contamination risk or alarm behaviour, so every change should go through the facility’s change-control process and be followed by retesting where required.
Keep a maintenance log for every item in the air path: compressor running hours and service history, dryer dew-point readings, filter element changes and differential pressures, and air-quality test results with dates and sample points. That log is what allows the facility to show, at any later inspection, that the supply has stayed within its approved condition. It also helps engineers spot slow trends, such as a dryer drifting towards its limit or a filter loading faster than expected, before they become alarms.
How Reddy Compressors helps
We work on the compressed-air side of specialist facilities, within boundaries set by the chamber maker and the facility designer. As an independent multi-brand specialist, we sell new and used or refurbished compressors, rent them, service them under AMC and supply spares for ELGi, Atlas Copco, Ingersoll Rand, KAESER, Chicago Pneumatic and other brands.
- We review existing compressors, dryers, filters and receivers and report their condition against the designer’s requirements.
- We supply and service oil-free and oil-injected compressors, dryers and filtration to an approved specification.
- We carry out compressed-air quality measurement and surveys to support the designer’s evidence.
- We provide temporary air for planned shutdowns where the designer approves the arrangement and the changeover method.
Our service team of more than 20 service engineers and technicians works from Tarnaka, Secunderabad, across Telangana and Andhra Pradesh. We do not design chambers, certify breathing gas or approve clinical use; those responsibilities stay with qualified specialists.
What to send us
- Facility type and the specific air duty the equipment will serve.
- The designer’s air-quality, pressure and flow requirements.
- A schematic of the existing or proposed air system.
- Nameplate photos of compressors, dryers and filters.
- Intake location photos showing nearby generators, vents and roads.
- Planned shutdown dates if temporary air is needed.
Frequently asked questions
What compressor is suitable for a hyperbaric chamber?
No compressor is suitable on its own. The chamber maker and facility designer specify the air duty, quality, pressure, flow and reliability, and the complete installed system must be approved. Oil-free compressors with appropriate drying and filtration are often used, but the decision rests on the designer’s specification and testing at the chamber inlet, not on the compressor’s label.
Is medical air the same as breathing air for a chamber?
Not necessarily. Medical air, breathing air and chamber pressurisation air may each be defined by different standards and tested differently. The facility’s clinical or diving technical authority decides which applies to each connection. Never assume one grade of air can serve another duty, and never connect industrial air to a breathing or oxygen system without approved engineering.
Where should the compressor air intake be located?
Away from diesel generators, vehicle routes, boiler flues, fuel storage, laboratory exhausts and HVAC discharges, and placed where wind changes will not bring contaminated air in. The facility designer approves the location after a site survey. Remember that standby generators run during outages, so check the intake under those conditions as well as on a normal day.
How is air quality proven for a hyperbaric facility?
By sampling at the points the designer specifies, usually including the chamber supply, under representative operating conditions, against the applicable limits. A certificate from the compressor outlet is not enough, because pipework, receivers and maintenance can change quality downstream. Sampling is repeated after changes and at intervals set by the facility’s procedures.
Can a rental compressor be used during a planned shutdown?
Possibly, but only if the facility designer approves it. The temporary machine and its treatment must meet the same air-quality and reliability requirements, the connection and changeover must follow an agreed method, and testing may be needed before use. Plan well ahead so equipment, hoses and treatment can be prepared and checked.
Does Reddy Compressors design or certify hyperbaric systems?
No. We supply, rent, service and survey compressed-air equipment within the boundaries the chamber maker and facility designer set. Chamber design, pressurisation control, oxygen systems, breathing-gas certification and clinical approval remain with qualified specialists. We support them with equipment, maintenance and measured data.
Related pages
Technical content reviewed by D. Srinivas Reddy, Managing Partner and service engineer, Reddy Compressors. Last updated 17 October 2026. How our engineering content is reviewed.