1.7 Protection against use of contaminated feedwater
Should there be an inleakage of cooling water into lie condenser, the feedwater to the boiler could be ontaminated. Contamination of feedwater can also ssult from the inadvertent release of chemicals from a olishing plant.
Modern boilers can sustain severe damage from contaminated feedwater. To prevent feedwater of an insuitable quality being fed to the de-aerator storage ink and from there to the boilers, or outsurged to ie reserve feedwater tanks, protection valves which re tripped shut on high conductivity levels are placed pstream of the outsurge connection and downstream f the polishing plant (if provided), as illustrated in fig 3.14. The hardware and detail design is discussed in Section 4 of this chapter.