Pre-Commissioning Cleaning

MWS (UK) Ltd Pre-commissioning cleaning division has over 30 years’ experience in new build projects across the United Kingdom and Europe. A dedicated team is allocated to the projects to ensure completion deadlines are met.


Engineering staff all fully compliant to BSRIA BG 29/2012 “Pre-commission cleaning of pipe work systems” and are trained in the science and philosophy of chemical treatments and microbiological control and prevention.

All newly installed closed systems, LTHW, MTHW, HTHW; Chilled Water and Condenser Water circuits must be pre-commission cleaned in line with BSRIA BG 29/2012. The vast majority of these systems have small bore control valves, regulating valves etc., which readily become blocked with particulate matter and would then fail to operate. Debris, present in a system as a result of the installation process needs to be removed. It is therefore important to ensure the presence of acceptable water quality prior to putting the system into operational use.

Cleaning systems prior to an initial balance is extremely important. Preceding the balance all valves can be fully opened and flushing flows maximized and manipulated to ensure that all possible debris is removed from the pipe work. It is rare that such an opportunity will present itself again since once a building is commissioned and occupied, regulating valves in the system will be at a set position with reduced orifice sizes to effect a system proportional balance. The use of a chemical enhances the cleaning process by removing soluble contaminants.

BSRIA BG 29/2012 ‘Pre-commission cleaning of Pipe work Systems’ outlines the methodology for cleaning new systems. In addition this guidance document outlines the responsibilities of designers and installing contractors. MWS (UK) Ltd will offer front-end advice on appropriate install requirements to carry out a smooth flushing procedure in the most cost effective manner.

We strongly recommend that pre-commission cleaning works are fully recorded, witnessed and samples analyzed to demonstrate cleanliness during the various flushing stages. In addition, we recommend final samples are taken at practical completion to demonstrate compliance with the specification for the new building.

Following Pre-commission cleaning it is important that closed systems are carefully monitored and regularly maintained.

This maintenance should continue throughout the life of the building and involve implementing a monitoring and maintenance regime. MWS (UK) Ltd offer full maintenance expertise including water quality monitoring, testing and full microbiological sampling in line with BSRIA BG 29/ 2012.

A comprehensive list of our flushing and Water Treatment Services is as follows:

  • Flushing to BSRIA BG 29/2012

  • Pre-commission chemical cleaning of closed systems to BSRIA BG 29/2012

  • Microbiological and Chemical Analysis

  • Site Survey & Risk Assessment

  • Closed system Water Quality Monitoring and Maintenance

  • Supply of Dosing Pots, Air/dirt Separators

  • Supply of Automatic Dosing Equipment

  • Inhibiting/biocide dosing of pressure test water

  • System pipework pressure testing

  • Temporary Pump hire

  • Sale & Hire Service

Head Office

Unit D Lynstock Way

Lostock, Bolton BL6 4SG


Phone:  01204 676 370

Southern Office

18 Burrs Way, Corringham

Essex SS17 9DE


Phone:  0845 319 0707

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