ISO 24316:2022

Overview

ISO 24316:2022 - Ships and marine technology - Design and test requirements for steel doors using electrical trace heating - specifies requirements for the design, materials, manufacture, testing and designation of electrical trace heating for steel doors fitted to vessels operating in low temperature environments (below −10 °C). The standard addresses structural types, sealing, materials (including trace heater cable construction), quality of manufacture and mandatory tests (weather-tightness and anti-icing) to ensure doors remain operable and ice-free in polar and cold-water service.

Key topics and technical requirements

• Scope and purpose
  • Applies to steel doors on vessels sailing where mean daily low temperatures fall below −10 °C (e.g., Arctic waters).
  • Ensures doors can be opened normally by adding heat via trace heating.
• Design & classification
  • Opening direction: Type L (left-hand) and Type R (right-hand).
  • Door locking modes: Type M (multi-buckle), Type H (single-handle linkage), Type W (hand-wheel linkage).
• Sealing
  • Sealing rubber stripe cross-section: 45 mm × 20 mm; allowable initial compression 2 mm; compression under closing should be < 4 mm at load-bearing plate.
  • Sealing stripe fixed with baffle and marine adhesive.
• Materials
  • Door plate and frame: weldable steel or marine steel with minimum tensile strength 235 N/mm²; low-temperature performance must meet hull material grade at installation.
  • Bolts/pins: corrosion-resistant with minimum tensile strength 235 N/mm².
  • Sealing elastomers and lubricants must be suitable for repeated low-temperature cycling.
• Trace heater cable
  • Composed of conductor, thermal resistor (self-regulating), insulating layers, metal shielding and an outer sheath.
  • Insulating/outer sheath materials may include HDPE, FEP, PFA or other proven materials.
  • Installation: cable must fit closely along the heated area, not be cut before fastening, and cable ends must be protected against moisture; follow supplier minimum bending radii.
• Quality & surface treatment
  • No weld defects; rust removal to Sa2.5 or St3 per ISO 8501‑1 and application of anti-rust primer.
• Testing
  • Weather-tightness (indentation and flushing tests) and anti-icing tests (device, conditions, procedures and pass/fail criteria are specified).

Practical applications and who uses this standard

• Ship designers and naval architects specifying doors for polar service
• Marine equipment manufacturers of heated doors and trace heating systems
• Shipbuilders and outfitters executing installation and surface treatment
• Classification societies, surveyors and flag administrations assessing compliance
• Shipowners/operators and operators in Arctic/cold regions seeking reliable, anti-icing access and safety systems

Practical benefits include maintained operability of doors in ice-prone waters, improved safety during evacuation, reduced icing-related failures and clearer procurement specifications.

Related standards and references

• ISO 8501‑1 - Preparation of steel substrates (rust grades and preparation)
• IEC 60519‑10 - Definitions and trace heater concept (referenced for heater terminology)
• IMO MSC.385 (94) - Definitions related to low-temperature environments (referenced)

Keywords: ISO 24316:2022, heated steel doors, trace heater cable, marine doors, anti-icing, weather-tightness, low temperature environment, ship door design, trace heating, marine technology.