Overview - ISO 19427:2019 (PPWS for suspension bridge main cable)
ISO 19427:2019 specifies requirements for pre‑fabricated parallel wire strand (PPWS) used in suspension bridge main cables. It covers production methods, material and mechanical specifications, test methods, inspection rules, marking, packing, transportation and storage for PPWS made from hot‑dip galvanized or zinc‑aluminium coated high‑tensile steel wires (as described in ISO 19203). The standard is intended to ensure uniform quality, traceability and fitness for long‑span bridge applications.
Key topics and technical requirements
- Product definition and designation: Standardised naming (example: ISO 19427‑PPWS‑5,00‑91‑1770‑Zn) to identify wire diameter, number of wires, grade and coating.
- Materials and manufacture: Wires must conform to ISO 19203; welds in wires are not permitted. Socket material and corrosion protection are agreed between purchaser and manufacturer.
- Traceability and documentation: Full traceability from raw material to delivery; manufacturers must retain documented information to identify product status and conformity.
- Lengths, gauge and tolerances: Gauge wire located outside the PPWS for length control; length tolerances of L/15 000 or 2 mm (whichever is greater) for marking points; socketing allowance typically ±5 mm. Specified marking/load conditions for gauge wires (e.g., >50 kg for 5 mm wire, >100 kg for 7 mm).
- Mechanical properties and tests: Requirements and test methods for tensile properties, modulus of elasticity and fatigue behaviour. Test methods include material testing, tensile tests of PPWS, modulus measurements, socketing process testing and fatigue testing.
- Socketing and inspection: Requirements for socket baskets, socketing media (molten metal alloy or resin), non‑destructive testing of sockets (visual, magnetic particle, ultrasonic, etc.) and agreed acceptance criteria.
- Identification, packing and handling: Marking, storage and transportation rules to protect coating and geometry during shipping and erection.
Applications and users
ISO 19427:2019 is used by:
- Bridge designers and structural engineers specifying main cable components for suspension bridges.
- Manufacturers of pre‑fabricated parallel wire strands and socket assemblies.
- Quality assurance, testing laboratories and inspection bodies performing mechanical and NDT tests.
- Contractors and erectors handling, marking, storing and installing PPWS on long‑span bridges.
Practical benefits include improved durability, predictable mechanical performance, consistent socketing practice and easier compliance verification during procurement and installation.
Related standards
- ISO 19203 - hot‑dip galvanized and zinc‑aluminium coated steel wires for bridge cables
- ISO 17558 - socketing procedures (molten metal and resin)
- ISO 6892‑1 - tensile testing of metallic materials
- ISO 10474 - inspection documents for steel products
- EN 1774 - zinc and zinc alloys for foundry purposes
Keywords: ISO 19427:2019, PPWS, pre‑fabricated parallel wire strand, suspension bridge main cable, hot‑dip galvanized, zinc‑aluminium coated, socketing, tensile test, traceability.
Open preview (PDF)Steel wire ropes — Pre-fabricated parallel wire strands for suspension bridge main cable — Specifications
