Reverse osmosis system annual maintenance checklist

Users told product water is off during the service

Owner and the people who draw RO water told the outage window and any backup supply before the skid is shut down, and told again when water is back.

Pre-service pressures, flows and conductivity recorded

Feed, concentrate and permeate pressures, flows and conductivity read before shutdown, so the post-service figures have a like-for-like comparison.

Every pump and control feed locked and tagged, skid depressurized

Feed or booster, high-pressure and dosing pumps and control power locked, tagged; feed shut, skid bled down. Powered runs: vessels closed, people clear, locks off by whoever hung them, re-locked.

Cleaning chemicals matched to the manufacturer's CIP procedure

Cleaner labels read against the membrane maker's CIP procedure, goggles, face shield, chemical gloves and eyewash ready before any mixing starts.

Membranes cleaned or replaced per condition

Clean-in-place run or membranes changed based on the trended pressures and quality, vessel and O-rings inspected on reassembly.

CIP solution temperature and pH held to the procedure

Cleaning solution temperature and pH read during recirculation and kept inside the membrane maker's limits, since too hot or too strong a solution damages the membrane.

Sanitization run to the manufacturer's procedure where required

Sanitizing agent and contact time as the manufacturer states, then rinsed until the residual test reads clear before product water goes back to the users.

Flush and cleaning cycle run until rinse is clear

Full flush or CIP cycle completed, rinse observed running clear before the unit is returned to product, no cleaning chemical left in the vessels.

Spent cleaning solution neutralized before it goes to drain

Spent CIP solution neutralized and discharged as the site's disposal rules and the chemical supplier's safety data sheet direct, with the quantity used recorded.

Storage tank pressure and draw-down checked

Tank air charge checked against the empty setpoint, draw-down and repressurization observed without short-cycling the pump.

UV lamp and quartz sleeve serviced where fitted

With the UV power isolated, lamp changed on the manufacturer's hours, sleeve cleaned and checked for cracks, lamp-on indicator confirmed after restart.

Recovery set back to the commissioning design

Concentrate valve adjusted so permeate and concentrate flows give the design recovery in the commissioning record, both flowmeters photographed after the change.

Post-service pressures and product reading re-observed

Operating pressures, permeate flow and the product-quality meter re-read after service and logged against the pre-service figures.

Low feed pressure shutdown and quality alarm exercised

Feed throttled until the low-pressure switch stops the pump, conductivity alarm triggered by the controller's test function, both responses recorded and reset.

Full skid checked for leaks after reassembly

Every housing, vessel end cap and fitting disturbed during service brought back up to pressure and checked dry.