What is Closed System Flushing?
Closed-system flushing of hot water and chilled water systems is a vital step in the installation and commissioning process of these systems.
It is necessary to ensure that the systems are clean, efficient, and free of any contaminants that could potentially damage the system or compromise the quality of the hot water or chilled water being provided.
Here are several reasons why
closed-system flushing is important:
Removing Contaminants
During the construction process, it is common for debris and contaminants to find their way into the hot water and chilled water systems. This could include dust, dirt, sand, and even small tools or materials that were left behind. If these contaminants are not removed, they can clog up the system and reduce its efficiency. Pre-commission cleaning helps to remove these contaminants and ensure that the system is clean and ready for operation.
Improving system efficiency
When a hot water or chilled water system is clogged with contaminants, it has to work harder to provide the desired level of hot water or chilled water. This can result in higher energy costs and a shorter lifespan for the system. Closed system flushing helps to improve the efficiency of the system by removing any obstructions that could hinder its performance.
Quality of hot or chilled water
Contaminants in the system can also affect the quality of the hot water or chilled water being provided. For example, if a chilled water system is contaminated with dirt or debris, it can cause the water to become dirty and potentially lead to the growth of bacteria or other microorganisms. This can compromise the quality of the chilled water being provided and potentially pose a health risk. Closed system flushing helps to ensure that the hot water or chilled water being provided is of the highest quality.
Protecting the system from damage
Contaminants in the system can also cause physical damage to the system. For example, dirt and debris can wear down pumps and other mechanical components, leading to costly repairs or replacements. Pre-commission cleaning helps to protect the system from this type of damage.
Closed System Flushing &
Cleaning Methods
There are several methods that can be used for closed-system flushing of hot water and chilled water systems. Some common methods include:
Chemical cleaning
This method involves using chemicals to dissolve and remove contaminants from the system. The chemicals used in this process are typically biodegradable and safe for the environment.
Mechanical cleaning
This method involves using automated means, such as brushes or scouring pads, to remove contaminants from the system physically.
High-pressure water jetting
This method involves using a high-pressure water jet to blast away contaminants from the system
Types Of Chemicals Required For Closed System Flushing
There are several types of chemicals that can be used during the pre-commission cleaning of heating and chilled water systems.
The specific type of chemical that is used will depend on the type of contaminants present in the system and the desired cleaning method. Some common chemicals used for pre-commission cleaning include:
- Alkaline cleaners: These are strong basic cleaners that are effective at removing grease, oil, and other organic contaminants from the system. They can be used to clean the inside of pipes, boilers, and heat exchangers.
- Acid cleaners: These are strong acidic cleaners that are effective at removing scale, rust, and other inorganic contaminants from the system. They can be used to clean the inside of pipes, boilers, and heat exchangers.
- Solvent cleaners: These are chemical cleaners that are effective at removing a wide range of contaminants, including grease, oil, dirt, and wax. They can be used to clean the exterior of pipes, boilers, and heat exchangers.
- Biodegradable cleaners: These are environmentally friendly cleaners that are made from natural ingredients and are safe for use in heating and chilled water systems. They are effective at removing a wide range of contaminants and are less harmful to the environment than traditional chemical cleaners.
Additional Guidance
Regardless of the method used, it is important to follow proper safety protocols when performing pre-commission cleaning. This will include wearing personel protective equipment (PPE), following proper handling and disposal procedures for chemicals, and ensuring that the system is properly purged and drained before beginning work.
In addition to pre-commission cleaning, it is also important to flush the hot water and chilled water systems prior to commissioning. This process involves running clean water through the system to remove any remaining contaminants and ensure that the system is fully operational.
Overall, pre-commission cleaning and flushing of hot water and chilled water systems is a crucial step in the installation and commissioning process. It helps to ensure that the systems are clean, efficient, and free of contaminants that could potentially damage the system or compromise the quality of the hot water or chilled water being provided. By following proper safety protocols and using the appropriate cleaning and flushing methods, you can help to protect your hot water and chilled water systems and ensure their optimal performance for years to come.
Echo Square Services are able to help you with all your pre-commission cleaning and flushing requirements, should you require any further assistance please don’t hesitate to contact our team by calling 0800 772 0628, or contact us here.
