Chemical cleaning of closed water systems is a process used to remove contaminants, scale, corrosion, and other impurities from closed-loop systems such as heating or cooling systems. These systems include pipelines, boilers, heat exchangers, and other equipment where water circulates in a closed loop. The goal is to maintain system efficiency, prevent corrosion, and extend the lifespan of the equipment.
A system assessment includes a thorough inspection of the closed water system to identify the type and extent of contamination, scale, or corrosion. Water samples are collected for analysis to determine the chemical composition and identify potential issues.
Appropriate cleaning chemicals are then chosen based on the identified contaminants. Common chemicals are acids, alkaline solutions, corrosion inhibitors and biocides. A specialist, such as PTSG’s Water Treatment experts, will consider the compatibility of cleaning agents with system materials to avoid damage.
Proper safety measures must be implemented, including personal protective equipment (PPE) for the cleaning crew. They will follow safety guidelines and protocols for handling and disposing of cleaning chemicals.
The procedure is as follows:
- System isolation. Isolate the closed water system from the rest of the facility to prevent contamination of other equipment or areas.
- Pre-cleaning flushing. Flush the system with clean water to remove loose debris and contaminants before initiating the chemical cleaning process.
- Chemical cleaning procedure.
- Introduce the selected cleaning chemicals into the closed water system.
- Circulate the cleaning solution through the system to ensure it reaches all components and removes contaminants.
- Maintain the recommended temperature and circulation time specified by the chemical manufacturer for effective cleaning.
- Monitor the cleaning process regularly, checking for changes in the water quality and assessing the effectiveness of the cleaning agents.
- Flush the system thoroughly with clean water to remove residual cleaning chemicals and dislodged contaminants.
- If acidic or alkaline cleaning agents were used, neutralise the system to bring the water back to a balanced pH level.
- Inspect the system again to ensure that contaminants, scale, or corrosion have been effectively removed.
- Add corrosion inhibitors to the system to protect it from future corrosion.
- Bring the closed water system back into operation, monitoring its performance and water quality.
- Document the entire chemical cleaning process, including the chemicals used, concentrations, circulation times, and results. This documentation can be valuable for future maintenance and compliance purposes.
The final step is to ensure that the chemical cleaning process complies with local environmental regulations and standards. The chemical cleaning of closed water systems should be carried out by experienced professionals to ensure the safety of personnel and the integrity of the equipment. PTSG is highly experienced in conducting this work for clients in different industry sectors.
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