21. Feed water for the boilers was taken from the Blaydon Burn, upon which the station was built.22. The desalinated water purity is a function of the feed water salinity, membrane selection and recovery ratio. 23. The forced circulation boiler begins the same as a natural circulation boiler, at the feed water pump. 24. Land-based steam engines could simply exhaust much of their steam, as feed water was usually readily available. 25. Quakes can shake loose particles and debris that clog rock channels that feed water to a geyser. 26. The steam cools and condenses against the heat exchanger tubes, thereby heating the feed water as described earlier. 27. Water capacities were 68 tons of fresh, 18 tons of distilled and 314 tons of boiler feed water . 28. Like the cooling water, the boiler feed water is also purged regularly, to prevent dissolved solids building up. 29. Up to 80 % of the feed water input can be recovered as fresh water, depending on feed salinity. 30. The feed water carries away the latent heat of the condensed steam, maintaining the low temperature of the stage.
