Overview
SIST EN ISO 6802:2019 specifies a standardized procedure for hydraulic impulse testing with flexing for rubber or plastics hoses and hose assemblies. Developed by CEN and aligned with the International Organization for Standardization (ISO 6802:2018), this European standard outlines methods for assessing the durability and reliability of hose assemblies subjected to pulsating pressures, both at high and low levels. The scope of SIST EN ISO 6802:2019 includes hoses used in hydraulic applications where regular flexing and impulse loading are common, thereby supporting quality assurance and compliance across industries.
Key Topics
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Hydraulic Impulse Testing with Flexing:
The standard provides procedures for simulating real-world operating conditions by applying pulsating pressures and continuous flexing to hydraulic hoses and hose assemblies.
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Pressure Ranges Covered:
- High-pressure testing: above 3 MPa
- Low-pressure testing: between 1.5 MPa and 3 MPa
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Flexing Test Methods:
Two main apparatus configurations are described:
- Revolving manifold for cyclical flexing
- Horizontally sliding manifold for linear flexing
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Test Fluids:
The standard specifies the use of fluids with kinematic viscosity per ISO 3448 (ISO VG 32 to ISO VG 100 at 40°C) but allows alternatives by agreement.
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Test Piece Preparation:
Complete hose assemblies, both aged and unaged, are tested in accordance with relevant product requirements.
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Result Expression & Reporting:
Results must be expressed as cycles to failure or total cycles completed. Detailed reporting ensures traceability, including failure modes, test conditions, and optional leakage classifications per ISO/TR 11340.
Applications
SIST EN ISO 6802:2019 is crucial for manufacturers, quality assurance specialists, and industries that use hydraulic hoses and hose assemblies in safety-critical or high-performance environments:
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Hydraulic Equipment Manufacturing:
Ensures that hoses for construction machinery, agricultural vehicles, and industrial equipment meet durability standards.
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Automotive and Transport:
Validates reliability for automotive hydraulic circuits and heavy vehicles subject to repetitive flexing.
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Maintenance and Quality Control:
Used by testing laboratories or quality assurance teams to certify hose assemblies before deployment.
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Standardization and Compliance:
Supports compliance with international and European regulations, facilitating trade and interoperability for products within and across markets.
Related Standards
For a comprehensive approach to hydraulic hose testing and terminology, consider the following standards cited in SIST EN ISO 6802:2019:
- ISO 6803: Rubber or plastics hoses and hose assemblies - Hydraulic-pressure impulse test without flexing
(For impulse testing not involving flexing)
- ISO 3448: Industrial liquid lubricants - ISO viscosity classification
(For specification of test fluid viscosity)
- ISO 8330: Rubber and plastics hoses and hose assemblies - Vocabulary
(Defines relevant terms)
- ISO/TR 11340: Hydraulic hose assemblies - External leakage classification for hydraulic systems
(Used for leakage assessment and reporting)
By following SIST EN ISO 6802:2019, organizations can ensure that their hydraulic hoses demonstrate appropriate resistance to failure under demanding flexing and pressure cycling conditions, improving product reliability, safety, and regulatory compliance. For optimal results, always consult the standard’s full guidance and integrate related standards within your quality management processes.
