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| Water Glycol - Fire-Resistant Hydraulic Fluids |
Post on 29 July 2002 at 12:09:00 by Admin. EN - Oilfiltration.com
Source : Practicingoilanalysis
The most common fluid faults noted in samples tested from water glycol users are particle contamination, contamination with other fluids and water loss or accumulation shifting the viscosity.
By Garry M. Basilone, UEC Condition Monitoring Services Laboratory / Practicing Oilanalysis 200205
Industrial fluid power applications have increased worldwide over the years. Hydraulic fluid performance demands have increased in operating pressures, safety and reliability. As operating pressures increase, the risk of fire from ruptured lines also increases. It is necessary to balance management’s regulatory and insurance interests with equipment requirements for effective lubrication, wear and corrosion protection.
Fire-resistant fluids include synthetics such as phosphate esters or ester-mineral blends and water-based formulas such as water-oil emulsions or water-glycols. Water glycol fluids have proven to be an excellent fire-resistant hydraulic fluid option. The fire-resistance of these fluids depends upon the vaporization of the water and the smothering effect of the steam. The other performance characteristics important to these fluids are viscosity, lubrication quality, operating temperature range, corrosion resistance, system compatibility and fluid maintenance. Excellent fire-resistance coupled with good cost and performance makes water glycol fluids the right choice for many industrial applications.
-Particle and dirt contamination is a problem for water glycols more than mineral oils because of the affinity of the polymers to hold the fine particles in suspension. Good maintenance practices and filter management is required.
-Contamination from mineral oils is readily observable by visual appearance (pink milky emulsion sample) or FTIR. Figure 1 shows a used normal fluid and a used contaminated fluid. The milky appearance and the layer of mineral oil on the top of the sample fluid suggest an oil/water emulsion condition. Contamination often occurs due to the widespread use of mineral oils near or on the equipment using the water glycols, or as a result of direct contamination resulting from poor reservoir top-up practices.
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