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Library› Deck› Ship Structure & Outfitting› Fire Door (A/B/H Class)› Norac AS B-15 double door with top panel - type N-MLDD
Norac AS

B-15 double door with top panel - type N-MLDD

Fire Door (A/B/H Class) · Ship Structure & Outfitting

Class-certified type (DNV register) · technical data sheet not yet verified

B-15 double door with top panel - type N-MLDD by Norac AS. DNV TA certificate TAF00001NM.

Inspection

Inspector Detail

Common issues

  • Door seal/gasket compression set over time, reducing fire and smoke sealing performance
  • Hinge wear causing the door to sag and no longer close or latch correctly
  • Corrosion of the door leaf, frame, or hardware in the marine environment
  • Self-closing device losing adjustment or failing, leaving the door not self-closing
  • Damage to seals from repeated impact or unauthorised overpainting
  • Misalignment after deck/bulkhead movement, preventing full closure against the frame

Inspection checklist

  • Function-test the door opens and closes freely and latches correctly under its own closer
  • Check door leaf and frame for distortion, corrosion, or damage
  • Inspect seals/gaskets for compression set, damage, or missing sections
  • Verify the self-closing device operates correctly and the door does not require force to close
  • Check any hold-open/release mechanism operates correctly and releases on demand
  • Confirm the door and hardware carry the correct, legible fire rating marking
  • Check hinges and latching hardware for wear and corrosion
  • Verify the door is not obstructed, wedged, or tied open in a way that defeats the self-closing function

Service intervals

Function/self-closing testmonthly, per SOLAS fire door testing requirements
Full condition inspection (seals, hardware, marking)annually or at fire safety survey
Hinge lubricationper PMS, typically every 6-12 months

Critical spares

  • Door seal/gasket set
  • Self-closing device (door closer)
  • Hinges
  • Latch/lock hardware
  • Edge trims and fixings

Safety

  • A fire door that does not self-close or fails to seal defeats its fire/smoke boundary purpose - treat any defect as a safety-critical finding
  • Never permanently wedge or tie open a self-closing fire door outside an approved hold-open arrangement
  • Fire doors form part of the ship's structural fire protection - unauthorised modification or overpainting of seals can invalidate the type approval

Class survey

Note: catalogued under 'Fire Hose' / 'Fire Hoses & Nozzles' - this product (B-15 double door with top panel, type N-MLDD) is a fire-rated steel door, not a fire hose; content above addresses the actual product. B-class fire doors are checked at fire safety surveys for self-closing operation, seal condition, correct marking matching the MED type approval certificate, and freedom from unauthorised modification.

Estimated lifetime: Not applicable in running hours - fire doors are assessed by condition, function testing, and periodic survey rather than a service-hours figure; typically expected to remain serviceable for the vessel's life with seal and closer maintenance.

Classification

DNV type approval

Verified against the DNV Approval Finder — the certificate below is issued by DNV, not by us.

CertificateTAF00001NM
Open the certificate at DNV
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