ISO 6806:2024

Overview

ISO 6806:2024 - Rubber hoses and hose assemblies for use in oil burners - Specification defines minimum requirements for rubber hoses and hose assemblies used in oil burner installations. The fifth edition covers construction, dimensions, physical performance and testing, marking and test frequencies. It specifies two hose assembly types with clear maximum working pressures and temperature limits for safe operation in oil burner systems.

Key topics and technical requirements

• Two hose assembly types
  • Type 1: For flux and reflux (not for insertion between pump and atomizer). Maximum working pressure 1.0 MPa (10 bar); maximum oil temperature 100 °C.
  • Type 2: For insertion between oil burner pump and atomizer. Maximum working pressure 4.0 MPa (40 bar); maximum oil temperature 100 °C.
• Construction
  • Internally smooth rubber lining with either a corrosion‑resistant metal braid, or textile/metal reinforcement plus rubber outer cover.
  • Permanently attached couplings with corrosion protection; metals must not harm rubber components.
• Dimensions and minimums
  • Inside diameters follow ISO 1307 nominal sizes (examples: 5, 6.3, 8, 10, 12.5, 16, 20, 25 mm).
  • Minimum lining thickness 1.7 mm, minimum cover thickness 1.3 mm (measured per ISO 4671).
  • Minimum bend radii defined per nominal size (e.g., 10 mm nominal → 80 mm min bend radius).
• Performance and testing
  • Hydrostatic tests (ISO 1402): proof and burst pressure requirements (Type 1: proof 2.0 MPa, burst 4.0 MPa; Type 2: proof 8.0 MPa, burst 16.0 MPa).
  • Oil swell limits (inside diameter reduction ≤ 10%) and oil resistance testing (ISO 1817).
  • External pressure resistance (outside diameter reduction ≤ 6%) and low‑temperature flexibility (no cracking at −40 °C per ISO 10619‑2).
  • Flammability, ozone resistance (cover only, per ISO 7326) and impulse testing (30 000 cycles).
  • Test frequency rules: type tests on new designs and repeated every 5 years or on change of materials/method.
• Marking
  • Markings must include: ISO 6806 number, nominal size, type (Type 1/2), manufacturer’s mark/reference and quarter/year of manufacture (e.g., ISO 6806 – 10 – Type 2 – MAN – 1Q23).

Applications

• Specification for rubber hoses and hose assemblies used in domestic, commercial or industrial oil burners.
• Ensures safe fuel transfer between tanks, pumps and atomizing connections in heating and boiler systems.
• Not intended for other uses without special assessment.

Who should use this standard

• Hose manufacturers and assemblers
• HVAC and boiler equipment designers and specifiers
• Quality and test laboratories performing hose qualification
• Procurement, safety and maintenance teams in facilities using oil burners
• Certification and compliance bodies

Related standards (referenced)

• ISO 1307, ISO 1402, ISO 1817, ISO 4671, ISO 7326, ISO 8330, ISO 10619‑2, ISO 48‑2

Keywords: ISO 6806, rubber hoses, hose assemblies, oil burners, Type 1, Type 2, hydrostatic test, oil swell, low‑temperature flexibility, impulse test, hose specification.