ACC9 Chemical in Oman: Which Air Coolers It Cleans and How to Dilute It

Fouled fins on a diesel engine air cooler raise the charge air temperature and reduce engine output. ACC9 chemical is the air cooler cleaner we supply in Oman to remove that oil, grease and carbon. ACC9 is a concentrated, solvent-based emulsion cleaner that mixes with water. It works on the air side of charge air coolers, on scavenge air systems and on the compressor side of turbochargers. For soak or recirculation cleaning, cleaners of this type are typically diluted to 10-30% in water, depending on how heavy the deposits are. For hand spray cleaning, our product sheet calls for the concentrate. We are based in Barka Industrial Area, Oman. Ask us to confirm stock and delivery to your site.

What ACC9 chemical is and what it cleans

A Google search for "acc9 chemical" often brings up laboratory compounds with similar codes. The ACC9 we sell is an air cooler chemical. It is a liquid that soaks into oily, carbon-laden deposits on cooler fins and tubes and turns them into an emulsion that rinses off with water. The chemical does the cleaning, so your crew does not need to scrape or rub the fins. Scraping and rubbing damage the metal surface.

Cleaners of this type are a mix of solvent and surfactant, and some grades include corrosion inhibitors to protect soft metals. Our ACC9 Air Cooler Chemical (RXSOL-16-0009-020) is a concentrated, water-soluble emulsion cleaner. It is made with a non-corrosive solvent, emulsifiers, detergent and corrosion inhibitors. Its safety data sheet lists hydrotreated light petroleum distillate (CAS 64742-47-8) at 10-30%. Products of this type typically look like a pale or light yellow to brown liquid.

It also removes light carbon from machinery parts. Engine room teams use it to degrease turbocharger parts and other engine components.

Which coolers suit ACC9, and when you need a descaler instead

ACC9 cleans the air side. Use it on:

• Charge air coolers of diesel engines
• Scavenge air systems
• The compressor side of turbochargers
• Air cooler tube bundles

The same product range also covers AHU and FCU coils, indoor and outdoor air conditioner coils, car condensers and radiators, air cooled chillers and air cooled condensers. For building HVAC coils in Muscat offices and malls, look at our acid-free Air Cooler Cleaning Chemical (RXSOL-16-0009-025). It handles those coils as well as scavenging systems and turbochargers.

The sea water side of the same cooler is a separate job. Calcium carbonate scale inside the tubes needs an acid descaler, typically at 3-20%, or 10-30% after degreasing. Do not use acid descalers on aluminium, zinc, tin or galvanised surfaces. Calcium sulfate scale does not dissolve in acid cleaners. ACC9 is a degreaser, not a descaler, so if your cooler needs both jobs, order the two products separately.

When to clean: air side differential pressure

Monitor the air side differential pressure across the cooler. Clean the cooler when it reaches the limit set by your engine maker. One engine maker allows a rise of up to 150 mm H2O. Another warning sign is a charge air temperature that keeps climbing while the load stays the same. Record both readings before you clean so that you can compare them afterwards.

How to dilute ACC9 and how much to order

Choose the dilution by how heavily the cooler is fouled. The figures below are typical for this class of air cooler cleaning chemical. Your engine maker's manual always takes priority.

• In-service injection for light oil mist: typically a 10-25% solution, used only if the engine maker approves it.
• Turbocharger air side: typically 5-25% in fresh water.
• Soak or recirculation: typically 10-30% in water. Use the low end for a thin oil film and the high end for thick carbon and oil sludge.
• Hand spray: the concentrate, as our product sheet specifies.
• Immersion bath for removed parts: the product heated to approx. 50°C.

For quantity, our product sheet gives 3 to 5 litres of cleaning solution per square metre of cooler. By engine power, it gives these amounts of solution:

• 6,000 to 12,000 HP: 2 to 3 litre
• 12,000 to 24,000 HP: 4 to 5 litre
• 24,000 HP or more: 5 to 6 litre

Worked example: a cooler with 4 square metres of face area needs 12 to 20 litres of cleaning solution at 3 to 5 litres per square metre. At a 20% dilution, that is 2.4 to 4 litres of ACC9 concentrate made up with water. One 25 litre container is enough for several cleans of that size.

Step by step: hand spray, soak, recirculation and in-service cleaning

Hand spray

1. Stop the engine. The engine must stay stopped for the whole process.
2. Open the air cooler drain valve and keep it open throughout.
3. Spray the concentrate over all of the cooler coils so it can emulsify the dirt and soak in.
4. Leave it for a minimum of 10 minutes. For heavy deposits, datasheets for this class typically give at least 1 hour.
5. Wash off the loosened deposits with high-pressure fresh water. Keep the jet at an angle that does not bend the fins.
6. Once the cooler is clean and has been flushed with fresh water, close the air cooler drains.

Immersion bath and soak

Put removed cooler parts in an ACC9 emulsion tank for at least 2 hours. Heat the product to approx. 50°C and agitate it with an air line. Then drain the tank, flush the parts well with water and dry them with an air line. For parts with stubborn carbon, dip them in the concentrated solution and let the deposits break down and loosen before you remove them, then rinse.

Recirculation in situ

Circulate a typical 10-30% solution through the air side, typically for 1-6 hours depending on how fouled the cooler is. Then rinse with fresh water.

In-service injection

Use this method only where the engine maker approves it. Inject a typical 10-25% solution upstream of the charge air cooler for about 10-15 minutes, then inject the same amount of fresh water. A typical starting routine is one injection every 24 hours, and each injection lasts about 48 operating hours.

After any of these methods, take the air side differential pressure again at the same load and compare it with your earlier reading.

Safety, metals, seals and oily wash water

Read the Safety Data Sheet before use. Wear chemical gloves and eye protection, and rinse off any splashes with water. Typical figures for this class are a density of about 0.92-0.93 g/ml, a flash point above 61 °C and a pH of 9.0-10.5. Once diluted in water, the solution is described as non-flammable, with no flash point.

ACC9 contains corrosion inhibitors to protect soft metal. If your cooler has copper, cupronickel or aluminium parts and you want to confirm compatibility, ask us for the technical bulletin. Cleaners of this type may swell rubber and synthetic rubber seals, so check the gaskets after cleaning and keep contact times within the figures above.

The rinse water carries emulsified oil. Keep the drains open so that it runs out of the cooler and does not reach the engine. Collect it and dispose of it under your site's environmental permit.

Where to buy ACC9 chemical in Muscat and across Oman

Muscat Chemical (Muscat & Barka for Business Trading) is based in Barka Industrial Area, Sultanate of Oman. Contact us to confirm stock and delivery to your plant or vessel. Call +968 77333599 or message us on WhatsApp at +968 77333599.

For ships and plants in the north, the same Air Cooler Chem Cleaner is also listed on our Sohar site. Further south, see the Salalah listing. Our earlier ACC9 supplier overview for Muscat, Sohar and Salalah gives more background. If you also need a descaler for the sea water side, you can browse all our engine room and coil cleaning products.

Request a quote for ACC9 by sending us your engine power or cooler face area and the cleaning method you plan to use. We will confirm the quantity and packing. Use our quote request page or WhatsApp +968 77333599.

Frequently asked questions

What is ACC9 air cooler chemical used for?

ACC9 is a concentrated, solvent-based emulsion cleaner. It removes oil, grease and carbon deposits from the air side of diesel engine charge air coolers, scavenge air systems and the compressor side of turbochargers. It is also used on AHU, FCU and air cooled condenser coils, and for light carbon removal from machinery parts.

How do you dilute air cooler cleaning chemical?

It depends on the method and how fouled the cooler is. Typical figures for this class are 10-30% in water for soak or recirculation, 10-25% for in-service injection and 5-25% in fresh water for the turbocharger air side. For hand spray cleaning, our product sheet calls for the concentrate.

Can ACC9 be used while the engine is running?

In-service injection is possible only if the engine maker approves it. A typical 10-25% solution is injected upstream of the charge air cooler for about 10-15 minutes, followed by the same amount of fresh water. For hand spray cleaning, the engine must be stopped and the drain valve kept open.

Is air cooler chemical flammable?

Products of this type typically have a flash point above 61 °C as a concentrate. Once diluted in water, the solution is described as non-flammable, with no flash point. Read the Safety Data Sheet before use and wear chemical gloves and eye protection.

Does air cooler chemical need rinsing after use?

Yes. After the contact time, wash off the loosened deposits with high-pressure fresh water, keeping the jet at an angle that does not bend the fins. Keep the cooler drains open while you flush so the oily rinse water runs out, then close the drains once the cooler is clean.