“How often should we get our chamber serviced?” This is one of the most common questions we hear from clinical engineering teams and wound care program directors — and rightfully so. Hyperbaric chambers are pressure vessels for human occupancy (PVHOs) that operate under elevated pressure and often oxygen‑enriched environments. Their safe use and maintenance are governed by highly specific safety codes and industry standards designed to protect patients, staff, and your facility asset.
Deciding how often your chamber should be serviced depends on a combination of regulatory guidance, manufacturer recommendations, and real‑world service history. Let’s walk through the key service intervals and why they matter.
Annual Preventive Maintenance (PM)
Annual preventive maintenance isn’t optional — it’s a fundamental part of keeping your chamber operating safely and reliably. NFPA‑99, the Health Care Facilities Code, includes maintenance requirements within its Chapter 14 for hyperbaric facilities, and ongoing inspection programs are a core expectation for compliance with accrediting bodies.
During a typical annual PM, a qualified technician will:
- Verify pressure integrity and leak testing: ensuring seals and windows hold pressure.
- Check valve function, calibration, and safety interlocks: to prevent performance drift.
- Inspect control and communication systems: including intercoms and emergency stops.
- Clean and inspect acrylic surface condition: including viewports or windows for signs of crazing, discoloration, or wear.
Annual service catches developing issues early, maintains system performance, and supports audit‑ready documentation — which is essential if your program is surveyed by the Joint Commission, DNV, or under UHMS accreditation.
Interim Inspections: Viewports & Component Checks
In addition to annual PMs, standards like ASME PVHO‑2 include requirements for regular viewport/operational inspections on acrylic windows based on usage frequency. These checks are conducted by trained personnel before pressurization, often daily or according to a usage schedule determined by cycle count or pressurization frequency. Undersea & Hyperbaric Medical Society
For example:
- Operational window inspections are often done before the first pressurization of the day if the chamber is used multiple times per day.
- Maintenance viewport inspections (more comprehensive) may occur periodically to document hidden damage and keep PVHO certifications valid.
This level of inspection protects structural integrity and continues to justify safe long‑term service life.
Mechanical Overhaul (MOH): About Every 10 Years
Beyond annual maintenance, hyperbaric chambers require periodic overhauls to sustain long‑term reliability. Many OEMs and third‑party service providers recommend a 10‑year Mechanical Overhaul (MOH) to:
- Replace seals, gauges, relief valves, and other wear‑prone components
- Disassemble mechanical assemblies for full cleaning and inspection
- Realign or recalibrate performance‑critical hardware
Under standards like ASME PVHO‑2, design life and service life provisions for critical components — such as acrylic viewports — are often based on time in service or cycle counts (e.g., 10,000 cycles). With proper maintenance and periodic overhauls, chambers can extend safe service life while maintaining compliance and safety documentation.
Even if your facility isn’t seeing failures, an MOH prevents mid‑decade surprises that could interrupt patient care and cause unplanned downtime.
Cylinder Overhaul (COH) / Extended Life Intervals: 15–20+ Years
Certified pressure vessels have long‑term overhaul considerations. Under PVHO standards and industry practice, certain components — particularly acrylic windows and other pressurized parts — have defined service lives. The ASME PVHO‑2 standard acknowledges that service life for acrylic viewports and cylinder assemblies can extend up to 20 years or 20,000 cycles if inspection requirements are met and documented.
At these extended intervals, a chamber overhaul or window replacement may be needed to continue safe operation and support insurance or accreditation requirements.
Usage Frequency May Adjust Your Schedule
Not all facilities use their chambers the same way. A hyperbaric program running daily treatments, multiple shifts, or high patient volume should plan more frequent inspections and possibly earlier service cycles than a low‑volume clinic. Key factors that can impact your maintenance schedule include:
- Total pressurization cycles per year
- Chamber age and service history
- Previous findings from annual PM reports
- Manufacturer recommendations and OEM service advisories
We always evaluate your historical service logs and usage patterns to build a custom maintenance plan optimized for your chamber’s needs — rather than a one‑size‑fits‑all timeline.
Internal Maintenance Between Professional Visits
Daily and weekly internal checks help keep your chamber in good condition between professional visits. These often include verifying oxygen supply pressure, inspecting door seals, ensuring gaskets are free of debris, and checking for basic wear on high‑use components. While not a substitute for professional PM, these practices help reduce service issues and extend part life.
Why These Intervals Matter
Consistent maintenance protects:
- Patient safety by ensuring systems operate within certified performance parameters
- Compliance with NFPA‑99, ASME, and accrediting agency expectations
- Asset longevity by catching issues before they become failures
- Operational reliability to avoid unplanned downtime or treatment cancellations
It’s not just about meeting a calendar date — it’s about meaningful, documented care of your chamber.
Need help building your service timeline? BaroServ can review your chamber’s history, usage, and inspection records to design a custom, compliance‑focused maintenance schedule that fits your facility’s needs.
