Rubber hoses and hose assemblies for water suction and discharge
1Key Takeaways
This document specifies the minimum requirements for textile-reinforced, smooth-bore rubber water- suction and discharge hoses and hose assemblies. Three types of hoses and hose assemblies are specified according to their operating duty requirements, i.e. their ambient and water temperature ranges: — ambient temperatur…
2Expert Interpretation
An in-depth interpretation of the ISO 4641:2024 international standard for rubber suction and discharge hoses, covering the technical parameters, dimensional tolerances, physical performance requirements and test methods of three types of hoses, including key indicators such as pressure resistance test, bending radius, low-temperature flexibility, etc., and providing standard update comparisons and implementation suggestions.
Analysis of the core content of the standard
The sixth edition of ISO 4641:2024 replaces the fifth edition of 2016. The main updates include:
- Updated versions of referenced standards ISO 7233 and ISO 10619-2
- Rubber performance requirements are limited to restatement in Table 1
- Revised marking requirements for hoses and assemblies (Chapter 10)
- Updated test requirements in Appendices A and B
Classification and performance requirements of hoses
| Type | Working pressure range | Bursting pressure | Applicable temperature |
|---|---|---|---|
| Type 1 | Suction -0.63bar/Pressure 3bar | ≥10bar | -25℃~+70℃ |
| Type 2 | Suction -0.8bar/Pressure 5bar | ≥16bar | -25℃~+70℃ |
| Type 3 | Suction -0.97bar/Pressure 10bar | ≥30bar | -25℃~+70℃ |
Key Performance Test Indicators
Material Characteristics
Rubber lining and covering layer must meet the following requirements:
- Minimum tensile strength7MPa
- Elongation at break ≥200%
- Performance changes after aging at 100℃ for 3 days: tensile strength ±25%, elongation ±50%
Structural requirements
Use textile reinforcement layer, optional metal spiral wire:
- Minimum lining thickness1.5mm
- Minimum covering layer thickness2mm
- Corrugation depth does not exceed 50% of the covering layer thickness
Test method update comparison
| Test items | Standard method | Key Changes |
|---|---|---|
| Vacuum Flattening Resistance | ISO 7233:2021 | Add 5% deformation limit for hoses ＞80mm |
| Low Temperature Flexibility | ISO 10619-2:2021 | Differentiate between test methods for ≤100mm and ＞100mm |
| Ozone Resistance | ISO 7326:2016 Method 2 | Specify no cracks at 0x magnification |
Implementation Recommendations
- Marking specification: Each meter of the hose must be marked with the manufacturer, standard number, type, size, working pressure and production quarter (such as: XXX/ISO 4641/Type 3/250/1MPa(10bar)/4Q22)
- Test frequency: Type test at least once every 5 years, production acceptance test is carried out in batches (500 meters or 10 tons of rubber as a batch)
- Coupling selection: Clamping, crimping or quick connectors recommended by ISO/TR 17784 are preferred
- Storage conditions: Refer to ISO 8331 to avoid direct sunlight and extreme temperatures