Plastics hoses — Textile-reinforced types for compressed-air applications — Specification
1Key Takeaways
This document specifies the requirements for four types of flexible thermoplastic hose, textile reinforced, for compressed-air applications in the temperature range from −10 °C to +60 °C.
2Expert Interpretation
An in-depth analysis of the ISO 5774:2023 international standard for textile-reinforced plastic compressed air hoses, covering the pressure ratings, dimensional tolerances, physical property requirements and test methods of four types of hoses, providing a complete technical guide from material selection to quality control.
Analysis of the core content of the standard
| Hose type | Working pressure at 23℃ (MPa) | Working pressure at 60℃ (MPa) | Minimum wall thickness range (mm) |
|---|---|---|---|
| Type A (for light industry) | 0.7 | 0.45 | 1.5-3.5 |
| Type B (for medium industry) | 1.0 | 0.65 | 1.5-3.8 |
| Type C (for heavy industry) | 1.6 | 1.1 | 1.5-4.5 |
| Type D (for mining) | 2.5 | 1.3 | 2.0-5.0 |
Material and structural requirements
The hose must consist of a three-layer structure: a thermoplastic inner liner, a natural/synthetic fiber reinforcement layer and a thermoplastic outer layer. The inner liner and outer layer must meet the following requirements:
- Tensile strength ≥15MPa, elongation at break ≥250%
- Performance change after aging at 70℃ for 7 days ≤15% (strength) and ≤25% (elongation)
- Heating mass loss ≤2% (ISO 176 method B)
- Volume change in oil resistance test ≤15% (60℃×72h)
Key performance test requirements
Hydraulic test standards
All hoses must pass the verification pressure test specified in ISO 1402 (2 times the working pressure), and no leakage or deformation shall occur during the test. The bursting pressure is required to reach 4 times (23°C) and 2.6-4 times (60°C) of the working pressure.
Special environmental test
For easily hydrolyzed materials, they must pass a 500-hour wet heat aging test (80°C/95%RH), and the mechanical property retention rate after the test must be >40%. The outer coating must also pass a xenon lamp aging test, with a color difference grayscale level >3.
Implementation recommendations
- Selection guidance: For mining applications, Type D is preferred. For high temperature environments (＞40℃), the rated value must be reduced according to the standard.
- Quality control: Production acceptance testing should be carried out for every 12,000 meters or 1,000kg material batch (refer to Appendix C)
- Marking specifications: Manufacturer logo, standard number, type, nominal diameter, pressure and temperature parameters and production quarter must be included
- Connection selection: Crimp, band or clamp connectors are recommended (refer to Appendix D)
Technology evolution analysis
Main updates of the 2023 version: Pressure units are unified as MPa/bar dual standards, marking requirements are refined, and reference standards are updated to the latest versions. Compared with the 2016 version, the performance requirements under high temperature conditions have been strengthened, especially the pressure retention rate of Type D at 60°C has been increased from 52% to 54%.