Important steps to be taken when changing a hydraulic system from mineral oil to a fire resistant fluid

When a hydraulic system is changed over to water- in - oil emulsion fluid, or a fire resistant fluid, strictly follow the following steps.

• Make sure that the hydraulic system components, especially pumps, valves, motors, and accumulators are compatible with new fluid.
• All the existing oil should be completely drained, cleaned and flushed.
• Drain the existing oil from hoses, pipe works and instruments and make them dry.
• It is essential to get out any contamination which might cause the new fluid to break down
• Most of the seals can be kept undisturbed. Butyl dynamic (moving) seals should be replaced in changing from synthetic fluids; seals must be changed to those rated for petroleum oil use.

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