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Library› HVAC› Marine Interior & Construction Materials› Fire Division Penetration Seal (Class A/B)› HS Inc. Multi-Cable Transit Sealing System-ESST system
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HS Inc.

Multi-Cable Transit Sealing System-ESST system

Fire Division Penetration Seal (Class A/B) · Marine Interior & Construction Materials

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

Multi-Cable Transit Sealing System-ESST system by HS Inc. DNV MED certificate MEDB00000UM.

Specifications

Technical data.

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IMO ApprovedYes
Inspection

Inspector Detail

Common issues

  • Sealing modules not compressed to the specified stack height, reducing fire/gas/watertight integrity
  • Missing or degraded sealant/coating around the frame
  • Transit overfilled or underfilled relative to its design cable schedule
  • Incorrect module selection for a mixed cable diameter set, leaving gaps
  • Frame or compression hardware corrosion in exposed locations
  • Fire-stopping integrity compromised by unauthorized cable additions without re-certification

Inspection checklist

  • Check for the compression-tool witness marks or certificate confirming correct stack compression
  • Check the frame for corrosion and secure fixing to the bulkhead/deck
  • Confirm no uncertified cable additions or removals have occurred since installation
  • Check the surrounding structural fire insulation/coating for integrity
  • For watertight transits, check for staining or other signs of water ingress
  • Verify the transit is correctly documented on the ship's fire control/watertight integrity plan

Service intervals

General visual inspectionquarterly to annually, per the planned maintenance system
Full re-verification of compression/seal integritywhenever cables are added or removed, and at dry-docking
Documentation cross-check against the fire/watertight integrity planat each internal fire safety audit or class survey

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

Typical wear limits

Module compressionset per the manufacturer's installation instructions and the transit's original certified schedule - no field-measurable numeric tolerance; verify against the original drawing if in doubt

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

  • Replacement sealing modules sized to match the transit's original certified cable schedule
  • Frame sealant/gasket material
  • Corrosion-resistant frame fixing hardware matching the original installation

Safety

  • Loss of integrity at a cable transit compromises both fire subdivision and watertight integrity - treat any breach as a structural fire safety defect, not a minor item
  • Any cable addition or removal must be done by competent personnel and the transit correctly re-compressed and re-certified afterward
  • Circuits must be de-energized under a permit-to-work before disturbing modules around live cables

Class survey

Note: this catalog entry is filed under 'General Marine Cables', but the product (HS Inc. Multi-Cable Transit Sealing System - ESST) is a cable transit/penetration sealing system, not a cable - the notes above address the transit system. Class checks that fire/watertight cable transits match the approved arrangement drawing and type approval certificate, with no uncertified field modifications.

Estimated lifetime: As a largely passive, static item, service life generally matches the vessel's structural life provided the frame is undamaged/uncorroded and no unauthorized field modifications have been made.

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.

CertificateMEDB00000UM
Open the certificate at DNV
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