Cleaning Process
1. System dynamic flushing
The objective is to remove as much debris as possible from the system to reduce the potential for system blockages. This process maximises flow rates through main risers and sub branches as detailed within the BSRIA application notes.
2. Biocide Wash
A full biocide will be carried out to remove bio films and bacteria from the system if the laboratory analysis indicates high level of bacteria (pseudomonas) within the system.
3. Chemical Clean
On commissioning, movement of the pipe work due to thermal expansion or contraction may cause contaminants to be released into the fluid stream, such as iron oxide-(rust). The objective of chemical cleaning is to loosen surface deposits so they can be removed from the system to create a stable surface within the pipe work, which, if maintained by an ongoing water treatment regime, will inhibit further corrosion.
On the completion of the chemical clean, the system is then balanced-flushed so system parameters are within 10% of incoming mains water.
4. System Inhibiting
On completion of the chemical clean, the system will be dosed with a suitable corrosion inhibitor and biocide to ensure ongoing protection from water to metal corrosion and biofouling. The system then needs to be circulated for seven days before samples will be taken and submitted for independent analysis (as detailed within BSRIA application notes).
5. Back Flushing
All terminal units should have been isolated during the pre-flushing procedures. The purpose of back-flushing is to remove any small debris that has collected within the terminal units.
On completion of our flushing procedures, a full set of documents will be forwarded for addition to the site O&M manuals. A copy of a typical set of documents can be provided for further information if required.