ISO 24319:2022

Overview

ISO 24319:2022 - Ships and marine technology - Design and test requirements for small steel hatches using electrical trace heating - specifies design, materials, quality of manufacture, testing and designation of electrical trace heating for small steel hatches installed on vessels operating in low‑temperature environments (below −10 °C). The standard addresses anti‑icing performance and weather‑tightness for hatch covers, coamings and associated hardware where trace‑heating prevents freezing and enables hatch operation.

Key topics and technical requirements

• Scope and purpose
  • Applies to small steel hatches fitted with electrical trace heating (trace heater cable, heated pads, or panels) for ships sailing in waters with mean daily lows below −10 °C (e.g., Arctic, Baltic regions).
• Types and locking arrangements
  • Three hatch types defined by locking mode:
    • Type A: butterfly nut (wing nut) open
    • Type B: wedge‑handle open
    • Type C: hand‑wheel linkage open
• Sealing and dimensions
  • Sealing rubber stripe section: 45 mm × 20 mm; allowable initial compression 2 mm, compression under closing < 4 mm.
  • Seals to be glued and mechanically retained; load‑bearing plate required near each closing device.
• Materials
  • Hatch covers, coamings and fittings: weldable shipbuilding steel with minimum tensile strength 235 N/mm²; low‑temperature properties must match or exceed local hull material.
  • Bolts and pins: corrosion‑resistant materials, min tensile strength 235 N/mm².
  • Sealing rubbers, insulating materials and lubricants must be suitable for repeated low‑temperature cycles.
• Trace heater cable construction
  • Core conductor + thermal resistor, insulating layers, metal shielding braid, and outer sheath.
  • Insulation and sheath options: HDPE, FEP, PFA or other proven materials.
  • Cable may be self‑regulating to adapt output to ambient temperature.
• Quality of manufacture
  • Smooth, defect‑free welds; no burrs or sharp edges; rounded corners radius 3 mm.
  • Surface preparation to rust grades Sa2.5 or St3 (ISO 8501‑1) with appropriate anti‑rust primer; movable parts greased with neutral lubricant.
• Testing
  • Weather‑tightness (including flushing tests) and anti‑icing tests (device, conditions, procedures and pass/fail criteria are specified).
• Designation and annexes
  • Annex A: nominal dimensions, closing devices, hinge positions. Annex B: trace heater cable selection and layout guidance.

Practical applications and users

• Who uses it:
  • Shipbuilders, naval architects and marine engineers specifying or manufacturing hatches for cold‑region operations.
  • Class societies, shipyards and marine equipment suppliers designing, installing or certifying heated hatches.
  • Maintenance teams and OEMs selecting trace‑heating components and installation methods.
• Practical benefits:
  • Ensures reliable hatch operation in icing conditions, compliance with class requirements, improved safety and reduced operational downtime in polar and cold‑climate waters.

Related standards

• ISO 8501‑1 (steel surface preparation, rust grades)
• IACS UR S26 (strength and securing of small hatches on exposed decks)

Keywords: ISO 24319:2022, heated small steel hatches, trace heating, trace heater cable, anti‑icing, marine hatches, low temperature environments, shipbuilding standards.