Mobil Pyrotec HFD 46 is a high performance fire resistant hydraulic fluid. It is designed for use in electro-hydraulic governor control systems of steam turbines, including systems using fine tolerance servo valves. It is also recommended as a fire resistant lubricant in, for example, steam and gas turbines as well as fire resistant hydraulic systems. Mobil Pyrotec HFD 46 is approved by Factory Mutual Insurance Company.
Mobil Pyrotec HFD 46 is formulated to provide good oxidation stability. Physical properties such as foaming, air release and demulsibility are controlled to meet the limits specified by turbine manufacturers.
Mobil Pyrotec HFD 46 has been evaluated in stringent tests for fire resistance. It will burn if the bulk fluid temperature reaches 368oC and is exposed to an open flame. However, in the spray ignition hot manifold ignition test (Factory Mutual Standard 6930 AMS 3150C) there is no flashing or burning at 704oC.
Mobil Pyrotec HFD 46 has the following benefits:
Mobil Pyrotec HFD 46 is recommended for use in:
- Electro-hydraulic governor control systems of steam turbines, especially
where a high performance fluid is required
- Hydraulic and oil circulation
systems operating in conditions subject to fire hazards
Mobil Pyrotec HFD 46 is unsuitable for:
- Hydraulic systems subjected to low temperatures. The normal operating temperature should normally be up to 65oC
to minimize thermal degradation.
However, it is possible to operate with fluid temperatures up to a maximum of
150oC.
- Use with Neoprene, nitrile and silicone rubber materials. Mobil
Pyrotec HFD 46 is compatible with seal and
hose materials such as butyl rubber
and Viton.
- Use with petroleum oils, conventional soluble emulsions, water
in oil emulsions or water glycol fluids.
ExxonMobil will be pleased to give
advice on flushing procedures.
- Use on most paints (other than two part
epoxy paints), enamels and varnishes.
Because of the solvent properties of Mobil Pyrotec HFD 46, it is necessary, therefore,
to consider treating all internal surfaces likely to come into contact with it.
| Mobil Pyrotec HFD 46 meets or exceeds the requirements of: | |
|---|---|
| Factory Mutual Standard 6930 AMS 3150C | X |
| Mobil Pyrotec HFD 46 | |
|---|---|
| ISO Viscosity Grade | 46 |
| Viscosity, ASTM D 445, cSt @ 40oC | 43.4 |
| Viscosity, ASTM D 445, cSt @ 100oC | 5.0 |
| Pour Point, oC, ASTM D 97 (max) | -20.0 |
| Flash Point, oC, ASTM D 92 (min) | 246.0 |
| Color, Visual | Colorless |
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