Hamworthy Boiling Point Autumn Winter 2018

Water analysis – What does it tell me? Hardness Increased risk of scale build up Conductivity Increased corrosion risk Decreased effectiveness of corrosion protection via anodes Chloride Increased likelihood of corrosion on stainless steel pH = Increased corrosion risk AUTUMN / WINTER 18 4 Checklist - Setting up the hot water system There is a variety of factors which can affect the suitability of equipment for different types of installations. Carrying out a water analysis (see table on the right) as the first step helps choosing products as well as system design. Certain materials and dead legs in the system with insufficient water flow can promote the growth of biofilm and Legionella. Another important aspect to consider is the mode of operation (e.g. what building/usage - process plant, commercial, domestic, etc.). Taking all this into account ensures a safe, efficient and reliable hot water system. Water may be treated before being distributed in the cold water mains network to make it fit for human consumption. However, what is desirable for humans can damage equipment and affect its efficiency. It is necessary to take measures to prevent this. All steps presented in this article are a recommendation. To ensure specific chemicals and procedures are suitable for your equipment, always refer to manufacturer instructions. DESIGNING A SAFE & RELIABLE HOT WATER SYSTEM Hot water is one of the daily necessities we often take for granted unless the supply is interrupted and it becomes a major inconvenience. But it is not only a matter of providing hot water reliably but also safely for the consumer. What are the risks involved for equipment and people, and what can be done to overcome them? Feature Operational risks Health risks & compliance with HSG274 Biofouling Microbial layers - breeding ground for infection-causing bacteria, viruses etc. Bacteria present in water systems which can cause Legionnaire’s Disease (a form of pneumonia), among other infections. The bacteria multiply rapidly in warm water (20-45°C). Risks to equipment Operational risk Due to pressure in modern hot water systems, potential for scalding water temperatures and hence harm to occupants/users of the building. Overcome all risks high high high high low low Acidity Scale Mineral deposits which can affect the efficiency of water heaters and cause equipment to break down. Electrochemical reaction which causes the disintegration of metals used in the hot water system. Causes leaks, early product failure and creates an environment in which bacteria can thrive. Corrosion Legionella