Pipeline systems
What maintenance does a medical gas pipeline need?
What periodic maintenance does a hospital medical gas pipeline system need?
Short answer
Under NHS England's HTM 02-01 (2026), a medical gas pipeline needs a planned preventive maintenance schedule under the Authorised Person (MGPS): daily and weekly alarm and plant checks, quarterly tests of every terminal unit and of PSA and compressor gas quality, and annual alarm and pipework checks, all under a permit to work.
A detailed public schedule is in HTM 02-01 Part B (2026 edition), NHS England's guidance on operational management. It says every medical gas pipeline system should have a planned preventive maintenance (PPM) schedule under the responsibility of the Authorised Person (MGPS), prepared with the Authorising Engineer (MGPS) and approved by the Medical Gas Safety Group. Manufacturers' recommendations are adopted where they go further than the HTM, unless a risk assessment supports another approach, and the frequencies are a minimum that should not be reduced to save costs.
Minimum tasks by frequency
| Frequency | Examples of tasks in HTM 02-01 Part B (2026) |
|---|---|
| Daily | Check the status of all plant alarms; for liquid oxygen, check for ice build-up and record vessel and pipeline pressures |
| Weekly | Check all local alarm panels; check plant and manifold gauges, plant noise, oil levels and automatic drains; check manifold cylinder contents, dates and storage |
| Monthly | Check safety and warning notices and cylinder batch labels |
| Quarterly | Test every terminal unit for gas specificity, mechanical function, leaks, flow and pressure drop; test gas quality from PSA and medical air compressors at least quarterly; test emergency supply kits |
| Annually | Check low alarm set points; test area alarm transducers; inspect exposed external pipework and exposed pipework in risers and corridors; test the secondary supply of a liquid oxygen system; pressure test nitrous oxide systems; calibrate test equipment |
| Every five years | Replace safety valves and medical supply unit hoses; inspect and clean AVSUs internally; check labelling |
How the work is controlled
All work, including the examination of terminal units, should be carried out under a permit to work issued by the Authorised Person (MGPS) at the point of work. Maintenance contractors should be certified to ISO 9001 and/or ISO 13485 with a scope that covers medical gas pipeline maintenance, should prepare a method statement for each task, and should provide an emergency call-out service available 24 hours a day, every day of the year. Clinical staff should be told about planned work and the alarms it may cause, but alarms during work must not be dismissed as spurious.
Records are part of the schedule: a signed report after every visit, a maintenance log for each plant item, and for terminal units a schedule of results with static and flow pressures, issues found and repairs made. Test instruments for terminal units should include a calibrated flowmeter and pressure gauge; blank test probes are only for leak tests.
Ultra Controlo supports its systems through UltraCare, a technical support programme of preventive and corrective maintenance, original spare parts and emergency support, 24 hours a day, 7 days a week; see what UltraCare is.
More questions
Who is responsible for medical gas pipeline maintenance?
In HTM 02-01 (2026), the Authorised Person (MGPS) is responsible for the PPM schedule and for day-to-day operation, and decides with the Quality Controller and Authorising Engineer when a system is taken out of or brought back into service.
How long do pendant and bed-head hoses last?
HTM 02-01 Part B assigns hose assemblies a service life of five years, because their condition cannot be judged by eye, and asks for replacement within that period.
Sources
- HTM 02-01 (2026) Part B, chapter 11 Maintenance (paragraphs 11.1 to 11.213 and task tables), NHS England
- HTM 02-01 (2026) Part A, paragraph 14.46, NHS England
- Ultra Controlo, Medical gas answers: UltraCare (Industrial 2026 presentation, p. 22)
Ultra Controlo figures come from its technical datasheets. Third-party facts were read at the source on the date shown.