In short: The parts most often replaced on a cooling tower are the fill (PVC film or splash fill), drift eliminators, spray nozzles, air inlet louvers and distribution pipework; fans, gearboxes and FRP fan stacks are larger items. To get the right replacement, send dimensions, photos, the tower model and the water quality. Fill is usually replaced in sections, and nozzles in full sets.
Which parts wear out?
- Fill: film fill fouls or sags; splash fill suits dirty water.
- Drift eliminators: cellular PVC blades that catch droplets.
- Spray nozzles: clog or crack; non-clogging types suit dirty water.
- Air inlet louvers: keep sunlight and splash in check.
- Distribution pipes: leak or block.
- Fan stack: FRP stacks resist UV and corrosion.
What should you send for a quote?
| Part | Send |
|---|---|
| Fill | flow type (crossflow/counterflow), sheet size, flute, height, water quality |
| Drift eliminator | blade type, block size, depth, airflow direction |
| Spray nozzle | thread or socket size, flow per nozzle, quantity |
| Louver | panel size and fixing details |
| Pipework | diameter, material, flange details |
How do you choose fill?
Film fill gives more cooling per volume but fouls in dirty water; splash fill is more tolerant. See film vs splash fill and fill fouling.
When should you replace parts?
- Fill: when cleaning cannot restore airflow or sheets collapse.
- Eliminators: when blades are broken or visible drift rises.
- Nozzles: when spray patterns are uneven.
- Inspect at shutdown: record what you find for the next order.
For tower types see crossflow vs counterflow.
Spare parts by wear rate
Spare parts planning
| Part | What wears it | What to keep in stock |
|---|---|---|
| Spray nozzles | Scale, debris, UV on exposed parts | A set for one cell, plus grommets or adapters |
| Fill | Fouling, scale, ice, physical damage | Replace by cell when needed; not usually stocked |
| Drift eliminators | Sagging, gaps, UV, people stepping on them | A few modules for damage repair |
| Louvers / air inlet screens | UV, ice, impact | A few panels |
| Fan and drive parts | Vibration and wear | Belts, bearings, as the fan maker advises |
Drift eliminators deserve their own check
Drift is water lost as droplets, and it carries the dissolved salts and treatment chemicals of the circulating water. A cooling tower manufacturer states in its drift report TR-024 that modern eliminators can reach about 0.001% of the circulating flow. Gaps between modules or damaged modules raise drift quickly. When you replace them, follow our drift eliminator replacement guide and seal every gap.
Measuring for replacement parts
- Nozzles: connection size and type, orifice size, spray pattern and flow per nozzle.
- Fill: type (film or splash), sheet pattern, flute size, pack dimensions and how it hangs or sits.
- Eliminators: module size, blade or cell pattern, airflow direction and supports.
- Material: PVC, PP or other, and the water temperature at the hot side.
A photo with a tape measure in view and the tower nameplate data save time. If the tower is a different make from the original parts, measure the support structure, not only the old part.
Timing
Plan major parts changes for a planned shutdown. Order before the outage: fill and eliminators are bulky, and export lead time plus sea freight needs to be in the plan. See export lead time and container loading.
Keep a spare parts record
Keep a simple record for each tower: the make and model, the cell count, the fill and eliminator type, nozzle model and the date each part was last replaced. Add photos. With that record, a spare parts order can be placed in one email, and you can see which parts wear fastest. It also helps if the tower changes owner or the original maker no longer supplies parts.
Common questions from maintenance teams
- Can I mix new and old fill? Within one cell, mixing types can upset air and water distribution. Replace by cell where possible.
- Can nozzles from another maker fit? Often yes, if the connection, flow and spray pattern match. Send the nozzle photo and the flow per nozzle.
- How do I know eliminators are failing? Wet areas around the tower, visible spray and deposits downwind are signs.
How FIBROVX can help
Send photos and dimensions of the parts and we will quote replacements. Request a quote. CIF by default, FOB on request.
Common mistakes
- Ordering fill by face area only: flute and height matter.
- Mixing nozzle types: uneven distribution follows.
- Skipping water quality: it sets fill type.
- Replacing fill but not eliminators: drift and water loss may stay high.
Key terms
- Fill: surface where water and air exchange heat.
- Drift: water droplets carried out by the air.
- Louver: blades at the air inlet.
- Fan stack: shroud around the fan.
FAQ
Which cooling tower parts need the most replacement? Fill, drift eliminators and spray nozzles.
What material is cooling tower fill? Usually PVC; PP is used for some splash and net fills.
What do I need to order a nozzle? Connection size, flow per nozzle and quantity.
Can fill be replaced in sections? Yes, if the type and size match the existing fill.
Related guides
Sources
- A Chinese manufacturer, cooling tower fill, drift eliminators and spray nozzles
- A Chinese manufacturer, cooling tower fill and parts
- A cooling tower manufacturer, Technical Report TR-024 "Cooling Tower Performance — Drift"