This guide has been superseded by BG 29/2021 Pre-Commission Cleaning of Pipework Systems amended 6th edition.
Pre-commission cleaning is the process of bringing a closed heating or cooling system to a satisfactory state for commissioning and ongoing maintenance of water quality.
Changes from BG 29/2012 to BG 29/2020 include guidance on topics that were not previously covered including:
- cleaning precautions for thin-walled carbon steel pipes,
- closed-loop pre-treatment cleaning (CPC) procedures,
- pre-treatment options described in German directive VDI 2035,
- corrosion monitoring solutions,
- heat networks and low carbon systems.
Example design diagrams showing flushing and cleaning provisions have been updated to include common features of modern variable-flow heating and chilled water systems.
Furthermore, section 3 of the guide has been revised to give greater clarity at the inspection and witnessing stages. Onus is placed on cleaning specialists to produce a sampling and analysis plan with target limits for various water quality parameters based on their knowledge of system materials, fill water and the ongoing water treatment regime
First edition: AG 8/91 Pre-Commissioning Cleaning of Water Systems
Second edition: AG 1/2001 Pre-Commission Cleaning of Pipework Systems
Third edition: AG 1/2001.1 Pre-Commission Cleaning of Pipework Systems (published in 2004)
Fourth edition: BG 29/2011 Pre-Commission Cleaning of Pipework Systems
Fifth edition: BG 29/2012 Pre-Commission Cleaning of Pipework Systems
Sixth edition: BG 29/2020 Pre-Commission Cleaning of Pipework Systems
Amended sixth edition: BG 29/2021 Pre-Commission Cleaning of Pipework Systems