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Changshu Haixin Ship Machinery Manufacture Co., Ltd.

Round Fire Dampers, Type HXFD Class A60

Fire/Smoke Damper · Ventilation

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

Round Fire Dampers, Type HXFD Class A60 by Changshu Haixin Ship Machinery Manufacture Co., Ltd. DNV MED certificate MEDB0000528.

Specifications

Technical data.

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IMO ApprovedYes
Inspection

Inspector Detail

Common issues

  • Damper blade fails to close fully because of corrosion or paint build-up on the blade edge or seat
  • Fusible link missing, painted over, or replaced with the wrong temperature rating
  • Seized shaft or bearing from corrosion, common in exhaust and galley ducting
  • Damaged duct insulation around the damper reducing the local fire rating
  • Linkage or return-spring fatigue preventing reliable operation
  • Incorrect installation orientation affecting closure under gravity/spring action

Inspection checklist

  • Functional test - manual or remote closure and reopening
  • Check fusible link (where fitted) is present, undamaged and of the correct rated temperature
  • Check the blade seats fully with no obstruction
  • Check shaft and bearings for corrosion or stiffness
  • Verify position indicator (where fitted) matches actual blade position
  • Check surrounding duct insulation and fire stopping is intact
  • Check certification/type-approval marking is present and legible
  • Confirm the damper is not painted or taped shut

Service intervals

Functional operation testtypically every 3-12 months per the ship's fire safety maintenance plan - confirm the exact interval against the SMS/PMS
Shaft and linkage lubricationcommonly every 6-12 months in exposed or salt-laden environments, using a lubricant that will not gum the mechanism
Fusible link replacementper manufacturer expiry, or immediately after activation

Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.

Critical spares

  • Fusible link (correct temperature rating for the location)
  • Blade seal/gasket
  • Actuator or return-spring assembly
  • Shaft bushing/bearing

Safety

  • A seized or obstructed damper may fail to close in a fire, defeating the compartment's fire boundary - this is a safety-critical failure mode, not just a maintenance item
  • Manual operation can trap fingers between blade and frame
  • Never paint over or otherwise obstruct fusible links or actuator linkages
  • Verify a closed damper does not block a means of escape before relying on it in drills

Class survey

Surveyors typically require a functional demonstration that fire dampers close fully, that fusible links are unobstructed and correctly rated, and that surrounding duct fire-stopping is intact and matches the fire control plan

Classification

DNV type approval

Listed in the DNV Approval Finder at the time we recorded it. The certificate is issued by DNV, not by us; check its current status at DNV.

CertificateMEDB0000528
Open the certificate at DNV
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