Physical properties of materials
Standard specifies expected values for tensile strength, elongation at break for both tube and cover compounds, as well as ageing and abrasion resistance for cover only.
Material of helix(es) should be galvanized hard or mild steel, or stainless steel if so required.
Performance requirements for hoses and hose assemblies:
Electrical properties and branding:
Hose can have either
- 2 low resistance bonding wires crossing uniformly with each other: in that case, resistance should be < 10exp2 Ohm per length and hose marked with "M"
- electrically conducting materials in its construction: in that case, resistance should be < 10exp6 Ohm per length and hose marked with "OMEGA’’
Where dissipation of electrostatic charges is a safety requirement (e.g. in explosive environments), hose assemblies should also have electrical resistance < 10exp9 through the hose and be marked with "/T"
Besides type (i.e. standard compliance) tests which should be made at least every 5 years, production acceptance tests are to be made regularly, some every 1000m and others every 10000m produced at the maximum.
There are also routine checks which apply to every hose or hose assembly.
Marking Hoses, fittings and hose assemblies !
There are a lot of information that should be written on hose, on fittings and also on hose assemblies.
For hose, please refer to our embossed texts.
For fittings, there should be manufacturer’s name or trademark, type and nominal size, material and max WP.
Hose assemblies should also have 2 identification bands with following information:
- band #1 which shall remain permanently on hose assembly
- band #2 which should be removed and replaced after each routine test
Storage and admissible storage time
Reference is made to ISO 8331 which states that bulk hoses (non fitted) can be stored up to 4 years max. 2 years as assembly. However, EN 12115 hoses and hose assemblies which have been stored for 3 years from date of production or date of last test should undergo the complete routine testing.