Mist Flammability Studies of Candidate Fire-Resistant Hydraulic Fluids
GEO-CENTERS INC NEWTON CENTRE MA
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Using NRLs mist flammability test apparatus, several commercial samples of 40 water-in-oil emulsions fire-resistant hydraulic fluids were screened for fire resistancy. The term fire-resistancy relates to specific flammability test conditions. For comparison purposes, two other commercial fire-resistant hydraulic fluids were screened viz., a water-glycol solution and a phosphate ester. The Navys currently used petroleum-type hydraulic fluid, 2190-TEP, was employed as the reference fluid. At the most severe conditions investigated i.e., spray disk tangential velocity of 67.8 ms, and fluid flow rate of 850 mlmin, none of the fire-resistant hydraulic fluids exhibited ignition leading to propagation in the presence of the propane test flame, indicating fire resistancy under these conditions. Under identical operating conditions, 2190-TEP exhibited gross ignition with propagation of flame ranging from 180 deg. to 360 deg. around the spinning disk, indicating it to be a potential fire hazard. The physical and chemical characteristics of the 40 water-in-oil emulsions suggest that this class of fire-resistant hydraulic fluids may be suitable replacement candidates for 2190-TEP. These promising results therefore warrant further study.
- Lubricants and Hydraulic Fluids
- Safety Engineering