Sea Technology

JUL 2018

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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Page 12 of 44

12 ST | July 2018 hull. Two EH-7 single penetrator Y cable assemblies that led to four wetmate connectors on a 16-in.- length cable formed a cable harness to connect the elevator and rudder control signals from the pressure hull to the control surface actuators. A set of two EH-8 single penetrators with Y cables formed a cable har- ness, which connected the thruster control signals from the pressure hull to the vehicle's main thrusters. DeepFlight Super Falcon 3S's communication system allows the pilot to verbally communicate with the surface support craft through a cable harness that connects the UQC underwater telephone signals from the pressure hull to the UQC transducer, which then broadcast and receive underwater communi- cations. This is supported via two EH-1 assemblies, which each fea- ture a single penetrator attached to a DeepFlight-furnished transducer and a 10-in. external cable. The system's lithium-iron phos- phate battery connectivity is sus- tained with two EH-3 double-ended penetrators with 7-in. cables that connect the primary power for elec- tronics inside the pressure hull from the port battery to the pressure hull. Two EH-17 double-penetrator, dou- ble-ended assemblies with 8-in. ca- bles connect the input power from the charging port to the port battery. Two additional EH-18 double-pen- etrator, double-ended assemblies each have 8-in. cable lengths and connect the input power from the starboard charging port to the star- board battery. General backup power is connected with two EH-4 double-ended penetrator assem- blies with 7-in. cables, forming a cable harness that connects the backup power for electronics inside the pressure hull from the starboard battery to the pressure hull. Penetrator Development The P25 inserts were carefully constructed, with 25 gold-plated copper-alloy contacts for strong electrical performance and were insulated with glass-reinforced ep- oxy (GRE) for advanced dielectric characteristics. They were cured in a custom 40-ton hydraulic transfer press that allows computer-con- trolled precision for injecting GRE and tested per BIRNS ABS-approved Test Procedure ETP-6510-101 (Elec- trical Penetrators-Submersible and Non Submersible Pressure Vessels for Human Occupancy). The ini- tial testing sequence requires the inboard sides of the inserts to be subjected to helium pressure (1,000 psi) testing. After the successful helium testing phase, with no evi- dence of leaks, cracking, extrusion or other signs of failure, the cable conductors were soldered to both inboard and outboard sides of the insert by J-STD-001 Class 3 and WHMA-A-620-A Class 3 certified technicians. The insert assemblies then un- derwent continuity and insulation resistance (IR) testing procedures. The IR testing requires that all 25 conductors be individually tested at a test voltage of 500 +/-50 V DC (707 V AC) for interference between one another and the penetrator shell—a minimum reading of 200 MΩ is required to pass. Once that test was successful, the shell was at- tached to the penetrator. The assemblies were then over- molded in BIRNS's NAVSEA S9320- AM-PRO-020 certified molding "The sub is in frequent use at its first resort in the Maldives, introducing travelers to unique new views and ways to experience flight in the ocean."

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