ICS 75.120                         PGD 36

Revised Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (First Revision) which is identical with ISO 7745 : 2010 'Hydraulic fluid power - Fire-resistant (FR) fluids - Requirements and guidelines for use' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the Fluid Power Systems Sectional Committee and approval of the Production and General Engineering Division Council.

In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure within an enclosed circuit. The most widely used liquid for hydraulic power systems is mineral oil which has advantages of excellent lubricity, availability in a wide range of viscosities and reasonable cost.

While not readily ignited in bulk, mineral oil is nevertheless flammable, and the high pressures associated with hydraulic systems can lead to a release of fluid which is easily ignited. In circumstances where ignition is likely, such as in a steel mill, or where released fluid cannot be allowed to propagate a fire, as in a coal mine, an alternative, fire-resistant, fluid must be used. Fire-resistance and physical properties such as viscosity and lubricity vary widely among the several types of fluid available. It is important therefore to select a fire-resistant fluid to match its proposed application and the perceived hazards in use.

This standard was first published in 2002 which was based on ISO 7745 : 1989 'Hydraulic fluid power - Fire resistant (FR) fluids — Guidelines for use’. The first revision of this standard has been undertaken to align it with the latest version of ISO 7745 : 2018.