What does this cooling tower annual checklist cover?

14 items across 5 sections, covering shutdown and entry, drain and clean, mechanical section, structure and controls, and more. Each item spells out what the person walking the job is actually looking for, not just a box to tick.

Who should run this inspection?

The mechanical service crew on the annual shutdown, with the treatment vendor for the disinfection.

When in the schedule should this walk happen?

Once a year at startup or layup, when the tower can be shut down and drained. The clean-out is what keeps scale and biofilm from carrying into the next season.

Why do these items ask for a photo?

10 of the 14 items call for photo evidence, 15 photos in all. A checklist answer without the photo is a claim; the photo is what makes the record worth something in a dispute and lets a reviewer approve work without re-walking the job.

What most often fails a cooling tower annual inspection?

Basin scraped and refilled with no plan for the biological control the treatment vendor is supposed to sign off, so the disinfection step gets skipped. Vibration in the fan section noted for two seasons running with no cut-limit switch tested and no balance actually checked. Structural steel corrosion at the waterline written off as surface rust until a fill support finally lets go.

Can I use this checklist in RTI?

Yes. Start a free RTI workspace, build this list as a checklist, and the Photo Gate holds the submit button until every mandatory item is answered and its photos are attached. Approved inspections roll into a branded turnover package with a tamper evident audit trail.

Free checklist

Cooling tower annual maintenance checklist

The annual cooling tower service is the deep pass: the measurements, cleanings and tests a quarterly round doesn't reach. This checklist keeps the full service on record with the photos that make it defensible later. Work is commonly verified against manufacturer's published instructions. Confirm the edition your authority having jurisdiction has adopted.

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The checklist

Every item, and the photo evidence it needs

The photo count on each row is what RTI would require before the item can be submitted. Work the list here and watch the gate hold, or load it into RTI and let it enforce the real thing.

Shutdown and entry

Water management program reviewed with the vendor
Annual review held with the treatment vendor and owner, hazard analysis, control limits and the startup disinfection procedure confirmed current before the drain.
No photo
Every energy source locked out for the shutdown
Fan, pump and any basin heater locked and tagged by each worker, makeup tagged shut; powered checks use the procedure's temporary release (basin filled if needed, people clear, guards on), then re-lock.
Basin entry checked against the confined-space program
Basin assessed under the site's confined-space program and, where it qualifies, permit issued, air tested and an attendant posted before anyone climbs in.
No photo

Drain and clean

Basin drained, cleaned and disinfected
Basin emptied to bare metal or FRP, sediment and biofilm removed, disinfection performed and logged with the treatment vendor.
Fill and drift eliminators pulled and inspected
A section of fill lifted for scale and fouling behind the face, eliminators pulled, cleaned and reseated with no gaps.
Distribution nozzles or basin orifices cleared
Spray nozzles or hot-water basin orifices cleared of scale and debris, cracked or missing nozzles noted for replacement, basin covers reseated.

Mechanical section

Gearbox serviced and fan balance checked
Gearbox oil changed and sampled, fan blade pitch and tip clearance within spec, no cracks at hubs, balance verified.
Vibration switch and belt drive serviced
Vibration cut-out functionally tripped and reset, belts replaced or re-tensioned, bearings greased on the service schedule.
No photo
Fan motor insulation resistance tested
Motor leads tested with an insulation-resistance meter with the fan re-locked, reading recorded against last year's value, terminal box dry and gasketed.
Motor mount and drive support bolts torqued
Motor base, drive supports and fan cylinder fasteners checked for corrosion and torqued to the manufacturer's values, belt or shaft drive left aligned.

Structure and controls

Structural steel, fasteners and casing inspected
Waterline and support steel checked for corrosion and section loss, casing and louvers sound, ladder and handrail secure.
Basin heater, level and safety controls verified
Freeze-protection heater and thermostat operational where fitted, level controls and low-water cutout proven, alarms reporting.

Restart and records

Tower refilled, restarted and run under control
Guards and doors back on, locks removed by the person who hung them, basin refilled, pump and fan restarted with rotation, level and staging observed.
Post-startup water sampling scheduled
Treatment vendor's startup chemistry re-established and the post-startup bacteria or Legionella sample scheduled per the water management program.
No photo

What usually sends this back

The failures are almost always the evidence, not the work

Basin scraped and refilled with no plan for the biological control the treatment vendor is supposed to sign off, so the disinfection step gets skipped.
Vibration in the fan section noted for two seasons running with no cut-limit switch tested and no balance actually checked.
Structural steel corrosion at the waterline written off as surface rust until a fill support finally lets go.

Common questions

6 answers

What does this cooling tower annual checklist cover?: 14 items across 5 sections, covering shutdown and entry, drain and clean, mechanical section, structure and controls, and more. Each item spells out what the person walking the job is actually looking for, not just a box to tick.
Who should run this inspection?: The mechanical service crew on the annual shutdown, with the treatment vendor for the disinfection.
When in the schedule should this walk happen?: Once a year at startup or layup, when the tower can be shut down and drained. The clean-out is what keeps scale and biofilm from carrying into the next season.
Why do these items ask for a photo?: 10 of the 14 items call for photo evidence, 15 photos in all. A checklist answer without the photo is a claim; the photo is what makes the record worth something in a dispute and lets a reviewer approve work without re-walking the job.
What most often fails a cooling tower annual inspection?: Basin scraped and refilled with no plan for the biological control the treatment vendor is supposed to sign off, so the disinfection step gets skipped. Vibration in the fan section noted for two seasons running with no cut-limit switch tested and no balance actually checked. Structural steel corrosion at the waterline written off as surface rust until a fill support finally lets go.
Can I use this checklist in RTI?: Yes. Start a free RTI workspace, build this list as a checklist, and the Photo Gate holds the submit button until every mandatory item is answered and its photos are attached. Approved inspections roll into a branded turnover package with a tamper evident audit trail.

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Run it with the Photo Gate

A checklist nobody can submit half-finished

Load this list into RTI, stick a QR tag on the area it covers, and the submit button stays locked until every mandatory item is answered and the 15 required photos exist. Approved walks roll into a branded turnover package with a tamper evident record behind every line.