ENGINES Distillation


1. Evaporation 2. Condensation 3. Precipitaion


Typical Purification Methods – Barriers


Purity Curves by Process DISTILLATION


REVERSE OSMOSIS FILTERS


Feed Water Barrier Filtered Water


Typical barriers include: Carbon Filters | Reverse Osmosis Ceramic Filters | Sediment Filters


Time


The table below shows the parameters for water purity published by Safran Turbomeca, the USCG and ISO as standards to be used in aircraft maintenance. The fourth column has the important information. This column shows the purity levels from water produced from an on-site distiller using the same parameters.


Description Appearance


Conductivity @ 25°C pH


Oxygen Ash


Calcium


Magnesium (total) Total Hardness Chloride


Sodium (total) Sulfate


Total Dissolved Solids (TDS)


Turbomeca Distilled Water Specification


Clear, limpid (pure), colorless w/o deposits or suspended materials


max 5µS/cm** 5.5-7.0


Max 0.4 Mg/L max 2 ppm NA**** NA NA NA NA NA


NA


U.S.C.G. Specification Distilled Water


Clear, pure, colorless w/o deposits or suspended materials


max 5µS/cm 5.5-7.0


Max 0.4 Mg/L max 2 ppm NA NA


1f vice*** 1 ppm 1 ppm 1 ppm


2 ppm


* Conducted by Midwest Laboratories Inc., Omaha, NE. Specific results available on request. ** µS is the symbol for measurement of electrical conductivity in micro-Siemens *** French measurement **** NA (not applicable) ***** n.d. (not detected)


20 HelicopterMaintenanceMagazine.com December 2014 | January 2015


ISO3696 Grade 3 Specification


Clear, pure, colorless w/o deposits or suspended materials


max 5µS/cm 5.5-7.0


Max 0.4 Mg/L max 2 ppm NA NA NA NA NA NA


NA


Distiller Results Typical of Actual*


clear and colorless


2µS/cm 5.63


n.d.***** n.d. n.d. n.d. n.d. n.d. n.d.


n.d.


Water Purity


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