How to remove Limescale from Heat Exchangers, Condensers and Chillers

4th March 2014 | descaling, limescale, limescale cleaner, limescale how-to, limescale remover

heat exchanger

To remove limescale from heat exchangers, condensers and chillers we recommend chemical treatment using Envirofluid’s range of Worksafe descalers. The Triple7 range is a formulation of surfactants and other Worksafe chemicals that will not harm equipment or endanger workers.

In contrast to most harsh and dangerous limescale removers Triple7 descalers does not contain dangerous chemicals. Instead they utilise natural acids such as Citric Acid and Lactic acid (commonly found in food products) combined with high tech non-toxic surfactants for performance that is superior to highly dangerous products such as Hydrochloric Acid.

Step By Step Guide: Removing Limescale from Heat Exchangers, Condensers & Chillers

Safety Precautions

Triple7 descalers have a low corrosion, non-toxic formula. In rare cases, however, they can cause mild irritation, particularly if prolonged contact with the product occurs. Gloves and protective glasses are recommended.

Step 1: Isolate Equipment

Disconnect and/or isolate the equipment to be descaled. If conductivity or other sensors are installed check maintenance guidelines and remove if required.

Step 2: Set up Circulation System

In order for Triple7 descaling products to work effectively they must be circulated through the equipment. This may be achieved through pumping machinery already connected to the system or through a pump specifically connected for the purposes of scale removal.

Step 3: Product Dilution

Make up a solution of any of the Triple7 descaling products with water, with the dilution level dependant on the cleaning application. Ensure you have more than sufficient solution to fill the system and circulate through equipment, including any pumps and pipes.

Step 4: Circulate and Monitor

Circulate for 8 to 16 hours to remove calcium and scale while monitoring pH levels. pH can be monitored easily with test strips. If pH rises above 3 add more undiluted product to bring pH down.

If excessive foam becomes an issue, Triple7 Antifoam can be added at 1ml per litre of Triple7 descalers.

If flow drops during descaling check any filters as scale deposits may come free during the process and cause blockages.

Step 5: Flush & Dispose

Drain descaling solution directly into sewer or waste water system. Flush entire system with fresh water until pH is above 6.

Step 6: Re-Connect & Test

Re-connect system including any sensors and test for normal operations.

NEXT: How to remove Limescale from Pumps & Pipes >

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2 responses to “How to remove Limescale from Heat Exchangers, Condensers and Chillers”

  1. George hernandez says:

    excellent please keep me informed i maintain 6 500 ton condensing towers crown cooling brawley ca. thanks George Hernandez

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