Multi-Cable Transit Sealing System-ESST system
Multi-Cable Transit Sealing System-ESST system by HS Inc.. DNV MED certificate MEDB00000UM.
Inspector Detail
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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 inspection | quarterly to annually, per the planned maintenance system |
| Full re-verification of compression/seal integrity | whenever cables are added or removed, and at dry-docking |
| Documentation cross-check against the fire/watertight integrity plan | at each internal fire safety audit or class survey |
Typical wear limits
| Module compression | set 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.
Components & Design
Component data being added…
Technical Data
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Maritime Network →DNV type approval
Verified against the DNV Approval Finder — the certificate below is issued by DNV, not by us.
- Certificate
- MEDB00000UM