Hydraulic Oils

Castrol Anvol PE 46 B


Castrol Anvol PE 46 B Fire Resistant Hydraulic Oil


Castrol Anvol PE 46 B is a high-performance fire-resistant hydraulic fluid which is primarily intended for use in steam turbine governor and boiler control systems. It is based on butylphenyl phosphate esters selected for their excellent hydrolytic stability and contains carefully selected corrosion and oxidation inhibitors.

It has excellent hydraulic performance and provides good fire risk protection.


Castrol Anvol PE 46 B is suitable for use in hydraulic systems where, in the event of leakage or pipe fracture, there is a risk of fire and where water-containing fluids are unsuitable due to temperature limitations or other reasons. It is specifically designed for use in the electro-hydraulic governor control systems of steam turbines, including systems using fine-tolerant servo valves.

Castrol Anvol PE 46 B was developed to eliminate service problems in high-pressure systems resulting from spool valve erosion/corrosion – fluid leakage and loss of response – by possessing the properties known to minimize this effect, notably high resistivity, low chlorine content and a high level of fluid cleanliness.

Physical properties such as foaming, air release and demulsibility are also carefully controlled within turbine manufacturers’ specified limits.


Castrol Anvol PE 46 B Lubricant Advantages:

  • Offers good fire risk protection in systems where fire resistance is vital and where water-containing fluids are unsuitable due to temperature limitations or the need to maintain a high hydraulic system pressure.
  • High flash point, fire point and auto-ignition temperature provide excellent fire resistance.
  • High resistivity eliminates spool valve corrosion/erosion due to electrokinetic effects.
  • Low chlorine level minimizes valve erosion.
  • High level of fluid cleanliness – minor amounts of particulate contamination can cause abrasive wear, filter blockage and valve sticking.
  • Meets the requirements of major OEMs such as General Electric, Siemens, Mitsubishi Hitachi Power Systems and Alstom.
  • Meets requirement of FM Global against Standard 6930 for ‘Less flammable hydraulic fluids ’.
  • Meets the requirements of ISO Standard 12922 and ASTM D4293 for HFDR-type fire-resistant hydraulic fluids.

User Advice
Service precautions
Periodic measurement of the fluid neutralisation number should be made during service as this provides a good guide to any product degradation which may occur. The level and rate of change of neutralisation value will be dependant upon the installation, conditions of operation, and whether in-line filtration of the fluid is carried out.

Conversion precaution
It is essential that rigorous flushing should be carried out when converting systems from other fluids to phosphate esters. All scale should be removed, and filters, hoses, seals and internally painted surfaces should be checked for compatibility with the new fluid.

Castrol Anvol PE 46 B is compatible with all metals commonly found in electro-hydraulic control systems. Aluminium components should be hard anodized and the use of copper and copper alloy components kept to a minimum. In common with all phosphate ester fluids, special seals are required and the following materials are suitable:

  • Fluropolymers (Viton)
  • Butyl Rubber
  • PTFE
  • Ethylene Propylene Rubber – under certain operating conditions.

Where paint materials are used, they should be epoxy resin based.

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Castrol Anvol PE 46 B Lubricant Oil

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