A purified water and WFI generation preventive maintenance schedule lists the checks and jobs done on the equipment at fixed intervals, how long each takes, and in what order of frequency, so problems are found before the purified water and WFI generation fails. This page gives the schedule used in the PlantOps360 task library for purified water and WFI generation (ation and distribution), which follows common industry practice for general-purpose equipment. It is also searched for as purified water system, PW loop, WFI, water for injection.
The maker’s manual and your site safety procedures always come first where they differ. Intervals set by law differ by state.
Purified water and WFI generation preventive maintenance schedule and checklist
| How often | Task | Estimated time |
|---|---|---|
| Daily | Record conductivity, TOC, temperature and flow in the loop; check alarms and trends | 10 min |
| Daily | Check storage tank level, vent filter and UV or ozone status | 5 min |
| Weekly | Sanitise the loop as per SOP (hot water, steam or chemical); log it | 20 min |
| Monthly | Check pumps, heat exchangers and sampling points; check microbial samples results | 45 min |
| Quarterly | Check RO or EDI performance; check UV lamp hours and replace as needed | 90 min |
| Half-yearly | Calibrate conductivity, TOC and temperature sensors; replace vent filters | 180 min |
| Annual | Annual service of the system; passivation review and requalification as per plan | 480 min |
Purified water and WFI generation maintenance frequency and yearly workload
At the estimated times, one purified water and WFI generation needs about 138 hours of preventive maintenance a year. The biggest single job is “Annual service of the system; passivation review and requalification as per plan” at 480 minutes, done annual. Multiply by the number of units you have to see the workload for your plant.
| Frequency | Tasks | Time per round | Hours per year |
|---|---|---|---|
| Daily | 2 | 15 min | 91.3 h |
| Weekly | 1 | 20 min | 17.3 h |
| Monthly | 1 | 45 min | 9.0 h |
| Quarterly | 1 | 90 min | 6.0 h |
| Half-yearly | 1 | 180 min | 6.0 h |
| Annual | 1 | 480 min | 8.0 h |
What goes wrong on a purified water and WFI generation without preventive maintenance
- Biofilm growth in dead legs and low flow areas
- UV lamp ageing
- Conductivity or TOC sensor drift
- Heat exchanger and pump seal leakage
What to watch between services
- Conductivity, TOC, temperature and flow
- Sanitisation records
- Storage tank vent filter
Safety and statutory notes for purified water and WFI generation maintenance
Purified water and WFI systems are validated. Sanitisation, sampling and calibration follow your SOPs and pharmacopoeia limits, and each result is recorded.
Where a purified water and WFI generation preventive maintenance schedule is used
This equipment is used in the industries below. Each link opens the preventive maintenance schedule guide for that industry, and the maintenance software page where we have one.
- Preventive maintenance schedule for electronics manufacturing plants · maintenance software for electronics
- Preventive maintenance schedule for pharmaceutical plants · maintenance software for pharmaceutical · maintenance software for api bulk drugs
- Preventive maintenance schedule for food, dairy and beverage plants · maintenance software for food processing · maintenance software for dairy
- Preventive maintenance schedule for hospitals and healthcare facilities
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Browse the full list of equipment preventive maintenance schedules (317 types).
Run this purified water and WFI generation schedule in maintenance software
In preventive maintenance software, each row above becomes a recurring task on the asset with its checklist, time estimate and parts. Tasks can be triggered by calendar date, running hours, meter readings or production cycles, each completed task is recorded with the person and date, and a failed check can open a work order. For the method behind it, read the guide to the preventive maintenance schedule, or use the free generator to get a 12-month plan for your whole equipment list.
Build my preventive maintenance schedule (free Excel)
Frequently asked questions
How often should a purified water and WFI generation be serviced?
In our schedule a purified water and WFI generation has 7 tasks: 2 daily, 1 weekly, 1 monthly, 1 quarterly, 1 half-yearly, 1 annual. The biggest job is “Annual service of the system; passivation review and requalification as per plan”, which is done annual. Always follow the maker’s manual where it gives a different interval.
What is included in purified water and WFI generation preventive maintenance?
It covers routine checks and jobs such as “Record conductivity, TOC, temperature and flow in the loop; check alarms and trends”, “Check storage tank level, vent filter and UV or ozone status”, “Sanitise the loop as per SOP (hot water, steam or chemical); log it”, up to the annual overhaul or inspection. The full list with times is in the table above.
How many hours of maintenance does a purified water and WFI generation need per year?
About 138 hours per unit per year at the estimated times in our library, including the daily checks done every day. Use it to plan workload, not as a benchmark.
Is there a free purified water and WFI generation maintenance checklist?
Yes. The table on this page is a ready checklist. The free preventive maintenance schedule generator turns it into a 12-month Excel schedule for your list of equipment, with monthly workload hours.