ON-LINE Dry Chemical Cleaning of Air Coolers "fin-fans"

“On-The-Run” Dry Chemical Cleaning

SENTRO TECHNOLOGIES USA, LLC specializes in ‘fin-fan’ Air Coolers  chemical cleaning during normal operating conditions.

There is no need to shut down the equipment, production continues normally.

Cleaning process applied on the external tube surface, through the whole bundle from bottom to top.

If the blade, should this be motor, is on the bottom (forced-draft type) we have to turn the blade off for approximately 30 to 45 minutes.

If the blade is on the top (induced-draft type) it stays running the entire time.


A Process of Chemistry & Physics

Cleaning is done by a combination of mechanical effect and chemical effect – simultaneously.


The mechanical effect is non-aggressive abrasion over the tube surface, without damaging the surface or the fins.

The chemical effect is a degreasing reaction between SENTROFIN™ chemicals and organic scale.

This innovative dry cleaning process is safe, environmental-friendly, and cost-effective.


Forced Draft Bottom View 














Induced Draft Bottom View


















Induced Draft Top View

We anticipate that the SENTROFIN™ On-Line Dry Chemical Cleaning of ‘fin-fan’ Air Coolers will deliver the following benefits and results:

  1. Cleaning is performed On-Line during normal operating conditions of the unit, there is no need to shut it down.

  2. Removal of scale and fouling from the external tube surface, forced and induced type coolers, thereby increasing thermal efficiency (heat transfer). As a result, reducing process outlet temperature, increasing production rate and in case of variable speed motors reducing operating energy consumption (fan power).

  3. No Scaffolding required.

  4. No water, no water-treatment.

  5. No dry-Ice (no thermal shock to tubes and fins, especially to aluminum or copper fins)

  6. No foam or soap (no caustic stress corrosion cracking)

  7. No clean-up or disposal requirements

  8. No harmful chemicals (no negative environmental impact)

  9. No damage to tubes, fins, electrical motors, instrumentation.

  10. No confined space entry


Major Benefits:

  •  Immediate increase of air coolers thermal efficiency

  •  Immediate increase of throughput/production

  •  Energy-saving by reduced fan power (in a variable speed motors)

  •  Reduce temperature profile of the furnace or boiler (cell, bridge wall, stack)

  •  Pre-shut down activity – saves time and costs

  •  Saves maintenance activities (such as: scaffolding, water high pressure blasting etc..)

Our On-Line Cleaning Process is SAFE and Environmental Friendly

  • Developed over years of R&D and field  experience

  • Chemicals are Non-toxic, Non-hazardous, Non-corrosive, Non-poisonous, Non-flammable, Non-explosive, Non-transport regulated

  • No damage to metallurgy, electrical motors, and instrumentation

  • Chemicals completely dispersed, appear like steam

  • Chemicals are compatible with all types of air coolers metallurgy

Dry Cleaning in Action – Forced Draft Air Cooler – Bottom to Top  











































Top View – Chemicals Disperse and Appear Like Steam 























Safety and Quality Control According to Sentro’s Safety and Iso Standards  





Examples of Tube and Fins Damages Due to Improper  Cleaning Methods

Reduce temperature profile of the furnace or boiler (cell, bridge wall, stack)





 Chemical damage to fins due to usage of caustic foam or soap –  SENTRO guarantees NO DAMAGES to tubes or fins

Physical damage to fins due to usage of high pressure water jet – SENTRO guarantees NO DAMAGES to tubes or fins

SENTRO Setup Near the Furnace: Equipment, Chemicals, Air Compressor and Hoses

Note that our footprint is compact and easily moveable between units.

refinery services


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