ISO 7745:2024

Overview

ISO 7745:2024 sets forth comprehensive requirements and guidelines for the use of fire-resistant hydraulic fluids in fluid power systems, as defined by ISO 6743-4. The standard outlines the operational characteristics, selection factors, and management practices for various categories of fire-resistant fluids, excluding those used in the hydraulic systems of commercial or military aircraft. It addresses challenges that may arise from the use of these fluids and provides practical procedures for safe handling, fluid replacement, and disposal, with a strong focus on health, safety, and system compatibility.

Key Topics

• Categories of Fire-Resistant Fluids:

  • Classification according to ISO 6743-4, including HFA, HFB, HFC, and HFD, each with unique compositions and properties.
  • Key fluid types such as oil-in-water emulsions, chemical solutions in water, water-in-oil emulsions, water polymer solutions, and synthetic fire-resistant fluids.

• Fluid Selection Considerations:

  • Factors such as viscosity, lubricity, compatibility with system materials, chemical and thermal stability, and required fire resistance.
  • The impact of fluid properties such as filterability, density, and vapor pressure on hydraulic system design and integrity.

• System Design and Compatibility:

  • Guidelines for selecting seals, gaskets, and hose materials compatible with specific fire-resistant fluids.
  • Recommendations for reservoir design, filtration, temperature management, and minimizing risks of cavitation and corrosion.

• Health, Safety, and Environmental Aspects:

  • Procedures for safe handling, storage, and disposal of fire-resistant hydraulic fluids.
  • The importance of using safety data sheets and adhering to appropriate disposal regulations.

• Fluid Replacement Procedures:

  • Step-by-step guidance for replacing one hydraulic fluid with another from a different category.
  • Emphasis on proper draining, cleaning, flushing, and recommissioning of hydraulic circuits to ensure system integrity and performance.

Applications

ISO 7745:2024 is vital for industries where hydraulic systems operate near sources of ignition or in high-risk fire environments, such as:

• Steel mills and foundries
• Mining operations
• Power generation facilities
• Industrial manufacturing plants

The adoption of fire-resistant hydraulic fluids as per ISO 7745:2024 minimizes the risk of fire incidents, supports safer working environments, and improves system reliability. By following the requirements and guidelines for fluid selection, system design, and fluid management, organizations can ensure optimal performance and longevity of their hydraulic systems while safeguarding personnel and property.

Related Standards

• ISO 6743-4: Hydraulic fluids - Classification of fire-resistant fluids, forming the basis for the fluid categories referenced in ISO 7745:2024.
• ISO 1629: Provides information on rubber nomenclature, relevant for sealing and gasket compatibility.
• ISO 5598: General terms and definitions for fluid power systems and components.
• ISO 12922: Additional specifications for fire-resistant hydraulic fluids.
• ISO 6743-5: Further classification for control fluids, including phosphate-ester fluids.

By referencing these related international standards, users of ISO 7745:2024 can ensure consistent terminology, accurate classification, and adherence to best practices across all aspects of hydraulic system safety and fluid management.

Optimize your hydraulic systems for fire safety and operational reliability by implementing the guidance of ISO 7745:2024-the international benchmark for fire-resistant hydraulic fluid requirements and usage.