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Longitudinal sealed pressure hull cable penetrator
High Pressure Seals Submarines

Longitudinal sealed pressure hull cable penetrator is used to run an electrical cable through a pressure hull and to form a pressure-tight unit with the pressure hull against overpressure media through the cable if the cable on the high-pressure side has been damaged or cut.

The test pressure is 90 bar.

  • Custom designed
  • Pressure tested up to 90 bar
  • Tested and inspected acc. to specification
  • EMP-version available

The PHP longitudinal cable joint is used as protection against incoming overpressure media/water through the pressure hull, vessels or barriers via the cables which have been damaged or cut. Application dimensions and cable types for the PHP are decided by the customer. Generally the PHP provides the same requirements as the cable. PHP penetration are currently used in both submarines and oil platforms. Metal parts can be supplied in different materials according to customers requirement.


The PHP and LSJ size, application dimensions and cable types for the PHP or LSJ are decided by the customer.


Typical technical data (acc. to customer demands)

Hydrostatic pressure: Test pressure: 9 MPa (90bar) or acc. to specification.
Shock: Mechanical: 2000 g acc. to IEC 60068-2-27
Work temp. range: Min. -40°C , Max. +70°C
EMP: Peak 1 kA, raise and fall time 30 ns
Longitudinal seal: Min. 10-6 cc/s air with 1 bar diff

PHP and LSJ are in several versions:

LVT = Longitudinal sealed (head-perform).
LVTT = Longitudinal and cross sealed.
E-LVT/E-LVTT = EMP shielded (EMC).
LVT-K = With connector on LP-side (only PHP).

PHP and LSJ are also available with EMC (Electromagnetic Compatibility) which provides the same protection as the above LVT and LVTT but also has built-in protection against EMP (Electromagnetic Pulse) and EMI (Electromagnetic Interference).

This protection is obtained by providing the outer shield on the cable's high-pressure side and low-pressure side with metallic contact with the PHP’s or LSJ's metal housing, which then must have metallic contact with the hull or bulkhead. In some cases, it may be sufficient to connect the shield to only the High Pressure or Low Pressure side.


Following testing and inspections are available upon request
• Dimension and visual inspection
• Radiographic examination of moulding
• Leak detection test
• Hydrostatic pressure test
• High voltage test
• Insulation resistance test
• Conductor continuity and function test
• Result verification and inspection report/certificate
• Or other tests specified by the customer

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