Pre-Commission Cleaning
System contaminants such as millscale, jointing compounds and building debris will inevitably be found in newly fabricated pipework systems. If allowed to remain in the system in sufficient quantity, these contaminants will make the system prone to blockage at strainers, control valves and small bore heat exchangers. They may also initiate further corrosion and encourage the growth of micro-organisms.
All pre-commission cleaning of heating, chilled and cooling systems are undertaken in accordance with BSRIA BG29/2012.
Flushing and sterilisation of new building domestic water services is carried out in accordance with BS 8558 requirements.
Deposits on heat transfer surfaces in boilers, process heat exchangers or heating / cooling systems reduce their efficiency resulting in high energy costs or loss of production. By removing these deposits, maximum system efficiency can be regained.
Acid cleaning involves the circulation of acid at a pre-determined concentration nd can be used for the removal of unwanted oxides and desposited scales from pipe surfaces.
The most commonly used acids for the removal of oxides from ferrous materials are inhibited hydrochloric acid, inhibited sulphamic acid or citric acid. Other chemicals may also be used for this purpose, depending on system metallurgy and design.
Stainless steel parts, equipment and systems require careful preparation before being taken into service for the production of food or pharmaceutical products.
All contaminants must be removed and the surfaces passivated. Validation tests and verification is carried out in accordance with ASTM A380 and A967 specifications.