Closed Water Heating & Cooling System Treatment
The treatment of water in modern low temperature hot water heating and cooling systems is essential for protecting from corrosion, limescale and microbiological fouling (biofouling). The build-up of biofilms can also lead to a reduction of heat transfer in heat exchangers and, in extreme cases, reduced water flow due to partial or complete blockages.
How does it work?
Keeping on top of this testing and system maintenance can lead to:
At 4i Water Services, we carry out pre-commissioning and system flushing to BSRIA BG/11 and BG 29/2012 regulation for both LTHW and chilled systems. All treatment chemicals used are carefully chosen for your industry and closed loop chilled water system, including high-quality biocides, dispersants, oxide removers and bio-dispersants.
There are several focus areas behind closed system chemical dosing, testing & flushing, and particularly in pre-commissioning system cleaning. Primarily, we aim to protect your metal system components from corrosion, which in turn protects your water from polluting suspended solids, and thus protects your water quality and safety. We also aim to remove installation contaminants and provide guidance on successfully cleaning the closed loop chilled water system, both from microbiological, chemical and foreign object contaminants
To support this, we are careful in the selection of the chemicals we use in our closed system dosing. Our experts assess the materials used to make sure they are fully compliant and of the best quality, ensuring that they are not aggressive to any of the plumbing works they come into contact with, nor that they encourage the growth of fungi or bacteria.
This is supported by water sampling and analysis, to make sure our results are safe and industry approved. Typically, one should have their heating and cooling systems tested every one to three months, with more frequent testing during their first six months.
Lastly, we offer our clients a “system health check” service, were we review the current condition of the system water and pipework, using thermal imagery and metallurgical analysis to establish system lifespan and its suitability for chemical de-sludge.
How can 4i Water Services help?
Fully BSRIA BG29/12 compliant, the experienced technicians at 4i Water Services are ready to carry out full pre-commission cleaning, testing, assessment, servicing and maintenance to your closed water pipework system. Need guidance on what your system requires? If you want more information about our closed system dosing, testing & flushing services, call 4i Water Services on 01359 242000 or contact us on info@4iwaterservices.co.uk today.
FAQs
Such systems are commonly utilised for heating and cooling applications, including:
- Heating systems such as radiators and boilers
- Chilled water systems associated with air conditioning
- LTHW (Low Temperature Hot Water) and CHW (Chilled Water) systems
As the water remains within a closed loop, appropriate treatment and ongoing maintenance are required to prevent corrosion, scale formation, sludge accumulation, and microbial growth.
- Radiators or underfloor heating systems
- Boilers operating on a sealed system
- Air conditioning or chilled water plant
- Pressurisation units or expansion vessels
If there is any uncertainty, 4i Water Services can undertake a prompt assessment of your premises to determine whether your systems are classified as open or closed.
- Corrosion
- Scale formation
- Sludge or particulate debris
- Chemical parameters
- Microbiological activity
Such testing provides a comprehensive assessment of system condition and helps identify whether any remedial or corrective action is required.
- System cleaning or flushing to remove sludge and debris
- Chemical treatment to control corrosion and scale formation
- Installation of filtration or side-stream filtration to remove contaminants
- Ongoing monitoring and planned maintenance to prevent reoccurrence
The appropriate remedial approach will depend on the system type, its current condition, and operational usage patterns.
- Enhanced system efficiency and overall performance
- Reduced energy consumption and associated costs
- Lower incidence of system failures and unplanned call-outs
- Extended service life of boilers, pumps, and associated pipework
- Improved temperature regulation and occupant comfort
- Compliance with relevant best practice and industry guidance
In summary, maintaining optimal water quality supports the protection of assets, cost control, and the safe, reliable operation of building systems.