WATER MANAGEMENT
condensate return systems improves both energy efficiency and long-term plant reliability. Carryover in a steam boiler occurs
when water droplets or dissolved solids from the boiler water are carried out of the boiler with the steam instead of remaining in the boiler. This can occur when dissolved solids levels become excessive or when boiler operating conditions become unstable. In healthcare facilities, carryover can create operational problems such as water hammer within steam pipework or reduced performance of sterilisation and humidification equipment. Boiler safety systems including temperature limiters, pressure controls, and protective devices ensure plant operates within safe parameters. Maintaining stable water chemistry supports these systems and reduces the likelihood of operational faults or shutdowns.
Monitoring and testing boiler water Effective boiler water management depends on consistent monitoring and testing. Routine testing allows engineers to confirm that water chemistry remains within acceptable limits and that treatment programmes are functioning correctly. Typical monitoring activities include testing for hardness, alkalinity, conductivity, and chemical residuals. Typically, estates teams combine specialist water treatment support with routine on-site monitoring carried out by trained operators. Daily testing allows plant operators to identify changes in water chemistry immediately and respond before problems develop. Selecting a professional water treatment company that is competent in boiler water systems is equally important, ensuring treatment programmes, monitoring regimes, and corrective actions are managed in line with recognised industry guidance and best practice. Monitoring should not be viewed solely as a compliance requirement. When undertaken regularly and interpreted correctly, water testing provides valuable insight into the overall health of the steam system. By reviewing results over time, estates teams
can identify trends and take proactive action before problems escalate. This shifts water testing from a reactive maintenance task to a proactive element of plant management.
Managing dissolved solids and boiler blowdown As steam is generated within a boiler, pure water evaporates while dissolved minerals and treatment chemicals remain in the boiler water. Over time this leads to an increase in the concentration of dissolved solids. If these concentrations are allowed to rise too high,
several operational issues can occur. High dissolved solids can increase the risk of foaming within the boiler, which in turn may lead to steam carryover. Excessive concentrations can also contribute to scale formation and unstable boiler operation. To control this, boilers use a process known as blowdown. Blowdown involves removing a controlled volume of boiler water and replacing it with fresh feedwater. This helps maintain dissolved solids within acceptable limits and ensures stable boiler operation. Two types of blowdown are commonly used. Bottom blowdown removes sludge and sediment from the lower parts of the boiler, while surface blowdown removes water with high dissolved solids from the upper water layer. Optimising blowdown rates is important for both efficiency and water management. Excessive blowdown wastes heat energy and treated water, while insufficient blowdown
Digital monitoring platforms enable detailed analysis of boiler water treatment data.
April 2026 Health Estate Journal 45
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