What maintenance does a hospital medical vacuum plant need?

HTM 02-01 Part B (2026 edition) covers the operational management of medical gas pipeline systems. Its maintenance chapter gives the minimum tasks at the minimum recommended frequency; the actual frequency should be established from the equipment and plant manuals together with the HTM, and the hours-run counter readings can be used with the manufacturers' recommendations to modify the programme (11.105, 11.109, 11.113). Part A adds that vacuum plant should be operated in accordance with the manufacturer's instructions and be covered by a planned preventative maintenance policy (10.57).

Weekly

• Check the pump motor and plant control panels for alarm conditions, and record the hours run for each pump.
• Check all pumps for security and any signs of oil leakage, and make sure the oil level is visible between the top and bottom edges of the sight glass.
• Check the bacteria filter and exhaust drainage flasks for liquid, and inform the Authorised Person (MGPS) if liquid is present.
• Record the vacuum cut-in and cut-out levels on the duty pump gauge and the running current of the duty pump, and make sure the pumps are in automatic mode.
• Change over the duty and standby pumps with the duty select switch, if this is not automatic.

Daily and weekly tasks are usually carried out by the healthcare organisation's estates team, although the organisation may ask the contractor to do some or all of them as an additional contract (11.105).

Quarterly and annual work on the plant

Part B provides checklists that may be used with manufacturers' data to prepare quarterly and annual maintenance schedules (11.154). On a central vacuum plant only one pump, or two on a three-pump unit, can be isolated at a time while the other pumps stop and start automatically, and relevant staff should be warned of the alarm indications and of the need for standby supplies where loss of vacuum is critical (11.179, 11.180). The central vacuum plant checklist includes:

• Before isolating any pump: check cooling fans where appropriate, examine the exhaust drainage traps for oil carry-over, and check flexible pipework and electrical bonding, the receivers, pressure gauges and visible electrical components.
• With one pump isolated at a time: holding-down and anti-vibration bolts; exhausts, filters and silencers; motor alignment; drive couplings or belts; cooling coils and fans; oil level and oil filter; and motor windings and bearings, each replaced, cleaned or adjusted as necessary.
• Plant tests: open and then close the receiver drain to record the cut-in and cut-out pressures and running currents of the duty and standby pumps (for variable speed plant, the running current and stabilised vacuum level under normal load), and isolate the duty pump to confirm that a plant fault alarm is indicated.
• Alarm test: test the vacuum level pressure fault switch and its alarm indicators by creating a small leak in the line to the switch.
• Records: the hours run for each pump.

Outside the plant, all terminal units, AGSS units excepted, should be tested quarterly for gas-specificity, mechanical function, leaks, flow and pressure drop, with the actual frequency set by the healthcare organisation from the use, age and design of the units (11.132, 11.213).

Bacteria filters, oil and waste

Because the bacteria filters protect the pumps, Part B classes vacuum pump oil and condensate as hazardous, not clinical, waste, and asks for the manufacturer's recommendations for replacing the bacteria filter elements to be followed, usually annually or after a specified number of hours, whichever comes soonest. Filters should be changed more often if a filter becomes wet or the pressure drop across it exceeds the supplier's specification (11.123), and a bacteria filter drain flask with liquid in it should not be opened without first consulting the Authorised Person (MGPS) and the infection prevention and control team (11.181). See how bacteria filters are changed and how often pump oil is changed.

ULTRAVAC

The ULTRAVAC datasheet describes the maintenance of its medical vacuum systems as replacing oil, oil separators and bacterial filter elements. Its basic configuration includes 2 bacterial filters with liquid separator; its listed components include a translucent trap that collects condensate from the exhaust, and its electric control box comes with analogue control or the QuVAC digital controller with a touch-screen panel, with 24-hour remote monitoring available as an option. ULTRAVAC systems are designed and manufactured under EN ISO 13485:2016 and ISO 9001:2015 quality management systems.