Our boundary: what this page covers and what it does not
Please read this first. Medical air must meet the applicable medical-gas standard, and the medical gas pipeline, terminal outlets, testing and certification are the responsibility of the hospital’s medical-gas contractor. Reddy Compressors supplies (new and used/refurbished), rents and services oil-free medical-air compressors of all brands, working with that contractor; we do not install or certify the pipeline or outlets. Breathing air is a separate specialist system built to its own standard.
What we do cover is the hospital’s ordinary engineering utility air: the compressors that serve the laundry, workshops, plant rooms and building services. This air is never suitable for patients, even if it comes from a clean, oil-free compressor, and it must never be connected to a medical gas system.
Medical-air compressor plant: what it involves
Medical air is produced by a dedicated plant that is entirely separate from utility air. A typical plant includes:
- Oil-free compressors (scroll, oil-free screw or oil-free reciprocating), so no lubricant can enter the air stream.
- Duplex or multiplex arrangement with duty/standby so that one unit can be serviced or fail without losing supply.
- Dryers, usually desiccant, sized to reach the dew point the medical-gas standard requires.
- Filtration and purification: particulate, coalescing and activated-carbon stages, with bacterial filters as the standard specifies.
- Monitoring and alarms for pressure, dew point and, where required, carbon monoxide, linked to the hospital’s alarm panels.
We supply, rent and service this compressor plant; the medical-gas contractor connects, tests and certifies it to the pipeline. See medical-air compressors for more detail.
Where is non-medical compressed air used in a hospital?
| User | Typical pressure | Flow pattern | Air quality (ISO 8573-1, typical) |
|---|---|---|---|
| Laundry: washer-extractors, tunnel washers, ironers, folders, pneumatic presses | 5–7 bar | Cyclic, often the largest user | Particles class 2–3, water class 4, oil class 2–3 |
| CSSD and sterilisation equipment support: pneumatic door seals, valves and actuators on sterilisers and washer-disinfectors (non-patient air only) | 5–7 bar as specified by the equipment maker | Intermittent, cycle-linked | As the equipment maker specifies – often clean, dry, oil-filtered |
| BMS, HVAC and AHU pneumatic actuators and dampers (older or retrofit systems) | 1.5–6 bar | Low, continuous | Instrument-quality: dry, oil-free at point of use, fine filtered |
| Engineering and biomedical workshops (non-clinical work) | 6–8 bar | Random | General purpose |
| Kitchen and food-service equipment | 5–6 bar | Intermittent | Food-contact quality where air touches food |
| Ambulance and vehicle maintenance, tyre inflation | 6–10 bar | Random | General purpose |
| Pneumatic tube transport systems (where blower-based, often not compressed air) | Low pressure, system specific | Intermittent | System maker’s requirement |
Sterilisation services are a boundary case worth stating carefully. Some steriliser and washer-disinfector models use compressed air only for their own door seals, valves and drying functions, and the maker specifies a utility-air supply. Where the maker or the hospital’s infection-control team requires a particular grade of air for any function, that specification governs. We supply and service the utility compressor only to the equipment maker’s stated utility-air requirement, never as medical air.
Segregation: keeping utility air away from medical gases
The most serious risk in hospital utility air is not a pressure drop – it is cross-connection. A workshop line connected to a medical air pipeline, or a medical gas outlet used to blow down a tool, can put patients or equipment at risk. Good practice:
- A separate compressor plant room or a clearly separated area for utility compressors, away from the medical gas plant.
- Separate pipework with distinct colour coding and labelling as utility air, following the hospital’s identification scheme.
- Quick couplings and outlets of a type that cannot connect to medical gas terminal units.
- No interconnection valves between utility air and medical air, even for “emergency” use.
- A drawing or schematic that shows the utility-air system and its boundary, kept with the engineering department.
- Permit-to-work for any work in plant rooms that contain both systems, so our technicians work only on the utility side.
Typical system architecture
- Compressors. One or two oil-injected rotary screw compressors suit most hospital utility loads, with laundry the main driver. Small hospitals may use a reciprocating compressor for the workshop and a separate unit for the laundry. Where actuators or equipment makers ask for oil-free air, an oil-free compressor or proper coalescing filtration can be considered.
- Receivers sized to support laundry cycles and give the compressors steady operation.
- Refrigerated dryer at about +3 °C PDP for the general network; a small desiccant dryer only if a branch runs through cold areas or an actuator maker asks for a lower dew point.
- Filtration: general and high-efficiency coalescing filters on branches feeding BMS actuators and steriliser support; general filtration for laundry and workshops.
- Distribution by building or zone with isolation valves, so a leak in the laundry can be isolated without losing BMS actuators.
- Point-of-use regulators at laundry machines, steriliser utility connections and actuator panels.
BMS and HVAC actuators: small air, big consequences
Many older hospitals, and some newer ones, use pneumatic actuators on air-handling unit dampers, chilled-water valves and isolation dampers. These need very little air but must have it all the time and must have it clean and dry. Water or oil in instrument air makes positioners drift and dampers stick, which affects room pressure regimes and temperature control in sensitive areas.
- Feed BMS actuators from a dedicated branch with its own filtration and, where possible, its own regulator and a small receiver as buffer.
- Check dryer dew point and drains on a fixed schedule.
- Do not let the laundry’s demand pull down the instrument branch; a pressure-sustaining valve or a separate small compressor protects it.
- Keep an eye on whether actuators are being converted to electric during refurbishment; air demand may fall and the compressor may be oversized.
Reliability and continuity
A hospital laundry often runs long shifts every day, and CSSD and BMS functions run around the clock. Utility air is not life support, but its failure disrupts linen supply, steriliser turnaround and building control.
- Provide N+1 compressor capacity, or a pre-arranged rental compressor for breakdowns.
- Connect the utility compressors to generator backup where the laundry and CSSD are on backup, and check that the generator can start the compressor motor.
- Use an AMC with planned preventive maintenance so that services are booked outside peak laundry hours.
- Keep critical spares on site: intake, oil and separator filters, drain valves, dryer filter elements.
- Log pressure, running hours and dryer dew point so problems are seen before they stop equipment.
Energy and noise
Hospitals run their utility compressors continuously, so small inefficiencies add up. Leaks at laundry machines, workshop hoses and old actuator tubing are common. Pressure set higher than needed costs about 7% more power for each extra bar. A fixed-speed compressor unloading for long periods at night, when only BMS actuators need air, wastes power; a small dedicated night compressor or a variable-speed machine can be a better fit. Noise also matters on a hospital site – choose enclosed compressors, site the plant room away from wards, and use vibration isolation.
Compressor heat recovery can pre-heat laundry water or domestic hot water, which a hospital always needs, and is worth considering when replacing compressors.
Indian context
Hyderabad has become a major healthcare and medical-tourism centre, with large multi-speciality hospitals, and district and teaching hospitals across Telangana and Andhra Pradesh are expanding. Many hospital engineering teams in India manage utility air alongside chillers, generators and water systems with a small team. Common local issues are hot, poorly ventilated plant rooms where summer ambient reaches 40–45 °C, compressors installed in basements with no fresh air, monsoon humidity overloading dryers, and voltage fluctuation. Discharge temperature on an oil-injected screw is normally about 75–95 °C; a machine running hotter usually needs ventilation or cooler cleaning, not a different oil.
Common problems and fixes
| Symptom | Likely cause | Fix |
|---|---|---|
| Laundry machines faulting on low air pressure | Undersized compressor or receiver, leaks, pipe restriction | Log demand during peak cycles; leak survey; add receiver near laundry |
| BMS dampers sticking or drifting | Water or oil in instrument air | Check dryer, drains and filters; dedicated instrument branch |
| Compressor trips in summer | Basement or hot plant room, blocked cooler | Ventilation and hot-air ducting; clean cooler |
| Water at steriliser utility connection | Dryer failure or drain stuck | Service dryer and drains; add point-of-use filter as maker specifies |
| Uncertainty over which pipes are utility air | Poor labelling, old modifications | Trace, label and draw the utility system; remove redundant links |
How Reddy Compressors helps
We are an independent multi-brand compressed-air specialist based at Tarnaka, Secunderabad, serving industry since 2002. For hospitals we supply, rent and service oil-free medical-air compressor plant (all brands, new and used/refurbished) alongside the medical-gas contractor, and non-medical utility air: new and used/refurbished screw and reciprocating compressors of ELGi, Atlas Copco, Ingersoll Rand, KAESER, Chicago Pneumatic and other makes, receivers, refrigerated and desiccant dryers and filtration for laundries, workshops, steriliser utility connections and BMS actuators. We are not an authorised dealer of any brand. We have tie-ups with all major and reputed brands.
Pipeline, outlets, testing and certification stay with the hospital’s medical-gas contractor. Our team of more than 20 service engineers and technicians covers all of Telangana and Andhra Pradesh for AMC, preventive maintenance, breakdown repair and overhaul of utility compressors and dryers, and we supply compressors, rentals and spare parts across India. We work within the hospital’s permit-to-work system, identify spares from the machine’s make, model, serial number and nameplate, and confirm fit before quoting. We can also survey leaks and log demand to right-size a replacement.
Our track record. We have supplied compressors to leading hospitals and healthcare organisations across Telangana, Andhra Pradesh and beyond – new and used machines, long-term rental, and breakdown cover when a hospital’s own compressor fails – backed by our own service team.
What to send us
- List of utility-air users: laundry machines, steriliser utility needs, BMS actuators, workshop, kitchen
- Existing utility compressor and dryer make, model, serial number and nameplate photos
- Equipment makers’ air requirements (pressure, flow, air quality) where available
- Plant-room location, ventilation and generator backup details
- Confirmation that the system is separate from medical gases, or a schematic if you are unsure
- The problem: low pressure, water, trips, noise, or planned expansion
Frequently asked questions
Can a normal air compressor be used for medical air in a hospital?
No. Medical air must meet the applicable medical-gas standard, using a dedicated oil-free duplex plant with dryers, purification and monitoring, kept separate from utility air. Reddy Compressors supplies, rents and services oil-free medical-air compressors of all brands, while the hospital’s medical-gas contractor handles the pipeline, outlets, testing and certification. Breathing air is a different specialist system built to its own standard.
What is non-medical compressed air used for in a hospital?
It runs the laundry’s washer-extractors, ironers and folders, supports steriliser and washer-disinfector door seals and valves where the maker specifies utility air, operates pneumatic BMS and HVAC actuators, and serves engineering workshops, kitchens and ambulance maintenance. None of these users is connected to patients, which is why this air can be supplied by an ordinary, well-maintained industrial compressor system kept separate from medical gases.
How should hospital utility air be kept separate from medical gas?
Use a separate compressor plant, separate pipework labelled as utility air, couplings that cannot fit medical gas terminal units, and no interconnecting valves under any circumstances. Keep a schematic showing the utility system’s boundary, and use permit-to-work for work in shared plant rooms. Your medical gas contractor and engineering department should confirm the boundary; utility contractors such as us work only on the utility side.
What size compressor does a hospital laundry need?
It depends on the number and type of washer-extractors, tunnel washers, ironers and folders, and how many run at once. Collect each machine’s air consumption from its maker, add workshop and actuator loads, and allow for leaks and growth. If the laundry is already running, logging real flow during peak hours is the most reliable method. A receiver near the laundry smooths cyclic demand and avoids oversizing the compressor.
Do BMS pneumatic actuators need oil-free air?
They need instrument-quality air: clean, dry and with very low oil at the point of use. An oil-free compressor is one way; another is an oil-injected compressor followed by a refrigerated dryer and high-efficiency coalescing filters on a dedicated branch. Follow the actuator maker’s specification. Wet or oily air makes positioners drift and dampers stick, which upsets room temperature and pressure control.
Can you service our hospital’s laundry and workshop compressors?
Yes. We provide AMC, preventive maintenance, breakdown repair, overhaul and spare parts for utility compressors and dryers of most makes across Telangana and Andhra Pradesh, planning visits around laundry hours and the hospital’s permit-to-work process. We also service oil-free medical-air compressors; pipelines and outlets stay with the medical-gas contractor. Send us the nameplate photos and a list of the users, and we will propose a maintenance plan.
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.