Vira sample coolers are used to take samples of water or steam from boilers at high temperature
and pressure. The counter-current flow through the shell and coil condenses the steam and cools hot fluids
efficiently to enable safe sampling.
When hot pressurised liquids are being cooled the sample cooler prevents 'flashing-off' which can be dangerous
and will result in an inaccurate sample. By utilising corrosion resistant materials for the cooler, contamination is
minimised, and service life maximised.
It is necessary to take regular samples of boiler water to test that a boiler is operating at the required TDS (total dissolved solids) level.
This should be done even if an automatic TDS control system is fitted since any automatic system should be checked at intervals. When a sample of water is taken from a boiler its pressure reduces and flash steam is formed.
If this flash steam were to escape to atmosphere without being condensed the resulting sample would show higher TDS levels than actually existed in the boiler water. To obtain accurate and safe samples it is therefore essential that sufficient cooling is carried out to fully condense any flash steam.
The sample cooler reduces boiler water temperature to around 25°C ready for immediate analysis.