Project requirements · Chemical
Anti-corrosion of armour and metal layers
Armour wires and metal sheaths are protected from corrosion in soil, sea water or wet ducts.
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Constructions that meet it
- Galvanised (or Zn-Al coated) armour: changes no layer: a property of the armour (its coating). Galvanised (or Zn-Al coated) steel wires or tapes (galvanised steel). Drawbacks: Coating is not visible in a cross-section.
- PE oversheath over the armour: changes the cable's layers. Extruded PE (or PVC) oversheath over the armour (PE). Drawbacks: PE is not flame retardant (see flame tests).
- Bitumen-impregnated yarn over the armour: changes the cable's layers. Bitumen-impregnated yarn or blown asphalt over armour or metal sheath (submarine, HV) (bitumen / asphalt, PP or jute yarn). Drawbacks: Messy at jointing.
- Zinc or stainless steel armour wires: changes the cable's layers. Some armour wires replaced by zinc wires, or stainless steel wires (zinc, stainless steel). Drawbacks: Submarine practice; cost.
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Tests
- EN 10257-2 / EN 10244-2: armour wire steel and zinc coating. Pass: coating mass per the standard (value not read)
- IEC 60502-1 / -2 armour clause: galvanised steel wire and tape; sheath over armour. Pass: construction
How specifications state it
Specified as 'galvanised', 'PE oversheath over armour', 'bitumen compound', or by EN 10257-2 / EN 10244-2.
Where it is asked for
- direct buried armoured cables
- submarine cables
- coastal and offshore installations
Sources
- Bekaert, Subsea cable armouring datasheet 2024 (EN 10257-2:2011, EN 10244-2:2009) (quoted by others)
- US 11232886 B2, Reinforced submarine power cable (bitumen-impregnated yarn, PE / PVC jacket) (quoted by others)
- Helukabel HY-CARBO LEAD GSTA (double galvanised steel tape armour acc. to IEC 60502-1) (maker's catalogue)