ENGINES
consumption, either. If we won’t swallow a glass full of tap water, why do we think tap water is OK for our multi-million dollar turbine engine to swallow? I bet you never thought about it that way. Looks like we had better rush right out and buy a couple
cases of “pure as the driven snow” bottled water right? Nope! This may be hard to swallow (no pun intended), but bottled water is not all it is cracked up to be. All purchased bottled water is not created equally. It can be fi ltered water, reverse osmosis water, spring water, etc., but more importantly, it is not distilled and if the water isn’t distilled, then it isn’t pure enough for our engines. Studies done by the Environmental
Working Group and other organizations that estimate at least 25 percent of bottled water is plain tap water. Yuck! And to think we are paying a couple of bucks for about eight ounces of designer water, thinking it is less contaminated than tap water. Talk about the power of a pretty face in the commercial. It looks like the only acceptable pure water to use in our helicopter engines is that which has been distilled. Since we can’t quite trust what the label says on bottled water, how do we ensure water we use is distilled? Let’s talk about the water purifi cation methods in use today fi rst.
Purifi cation Method The barrier method and the distillation method are two basic techniques for purifying water to purity qualities better than tap water. The barrier method uses fi lters and membranes (as in reverse osmosis), removing some of the particulate impurities and little or none of the chemical and biological impurities. The latter is especially important in drinking water. However, and most importantly, the barrier method’s eff ectiveness withers as the barrier becomes saturated or clogged with contaminants, resulting in varying levels of water purity over time. The water going into our bottle is “purifi ed” via the barrier method. Distillation is a completely diff erent
process. Boiling water kills bacteria and viruses. The water undergoes a “phase change” to steam and pure H2O molecules rise, leaving behind the contaminants. The steam is separated and condensed to form distilled water. Distilled water quality remains constant over long periods of time. The distillation
process produces high-quality water. e want only the best for our engines, so for turbine rinse water, a dual cartridge mixed- bed de-ionization system is typically added. This addition provides “polishing” (which means the removal of any possible stray positive or negative ions), of the distilled water. Polishing ensures the purest possible water for our engine.
Liquid (Contaminated H2O) Liquid (“Pure” H2O) Vapor (H2O Steam)
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HelicopterMaintenanceMagazine.com 19 TRY
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