This updated guide replaces the previous edition (BG 29/2012). 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.
The 2020 version has been expanded to 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.
Editable Excel versions of the proformas in appendices B and C of this guide are attached to the pdf of the guide.
This publication is also available as part of the Commissioning Guide Set (Compak3) and the Pre-Commission Cleaning and Water Treatment Set (PCWT).
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