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

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

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.