Sceptre Power Sdn Bhd
No. 49, Jalan TS 6/5,
Taman Industri Subang,
47510 Subang Jaya,
Selangor, Malaysia.
+603-8011 6618

ON-LINE Dry Chemical Cleaning of ¡®fin-fan¡¯ Air Coolers

“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 external tube surface, through the whole bundle from bottom to top.
If the blade 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 combination of mechanical effect and chemical effect – simultaneously.

The mechanical effect is non-aggressive abrasion over the tube and fin surface, to remove inorganic scale without damaging the surface or fins.

The chemical effect is a degreasing reaction between SENTROFIN chemicals and oil deposits, hydrocarbons, and other types of organic scale.

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

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 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

Photo Gallery

Dry cleaning in action – forced draft air cooler – bottom to top


Top view – chemicals disperse and appear like steam

Example of finned tubes before/after SENTRO dry chemical cleaning

Safety and Quality Control according to SENTRO’s Safety and ISO Standards


Examples of Tube and fins damages due to improper  cleaning methods

Carbonates scale due to usage of fire-water for the cleaning – SENTRO guarantees NO DAMAGES to tubes or fins

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

SENTROFIN dry chemicals are non-hazmat, non-toxic, not regulated for transport


SENTRO setup near the air coolers: Equipment, Chemicals, Air Compressor and Hoses – our footprint is small.


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