Umbilical with zero buoyancy has 4 power conductors, 1 coaxial conductor and 1 twisted pair.
It is lightweighted (no more than 94kg/km) and has high strength (breaking strength is not less than 2kN).
Umbilical is used in diving video recording systems for power supply to underwater camera, light and for video transmission to on-board unit.
№ |
Name |
Material, dimensions | Diameter, mm |
1 |
Load-carrying element |
ARMOS thread, 35х58,8 | 2,1 |
2 |
Power conductor |
Copper, 7×0,31 (0,5 mm²) | 0.9 |
3 |
Power conductor's insulation |
Copolimer of propylene 02015-302 KM, D=0,6mm | 2,1 |
4 |
Twisted pair |
Soft copper MM 7×0,15 (0,12mm²) | 0,45 |
5 |
Twisted pair isolation |
Copolimer of propylene 02015-302 KM, D=0,25mm | 0,95 |
6 |
Twisted pair jacket |
Ultrathene | 2,1 |
7 |
Coaxial conductor |
Soft copper MM 7×0,063 | 0,2 |
8 | Coaxial insulation | Copolimer of propylene 02015-302 KM, D=0,25mm | 1,0 |
9 |
Coaxial screen |
Cross-braiding 48×0,08 mm | 1,32 |
10 | Coaxial jacket | Copolimer of propylene 02015-302 KM, D=0,4mm | 2,1 |
11 | Intermediate jacket | D=1,5 | 9,0 |
12 | Jacket | d=1,1 | 11,0 |
Electrical
Electrical resistance of power conductors |
no more than 40,5 Ohm/km |
Insulation resistance of power conductor |
not less than 1000 MOhm/km |
Electrical resistance of twisted pair conductor |
no more than 170 Ohm/km |
Insulation resistance of twisted pair conductor |
not less than 100 MOhm/km |
Impedance of twisted pair /1MHz |
120 +/-5% Ohm |
Attenuation factor of twisted pair/1 MHz |
no more than 20 db/km |
Electrical resistance of coaxial central element |
860 Ohm/km |
Electrical resistance of coaxial screen |
80 Ohm/km |
Impedance of coaxial | 75 Ohm |
Attenuation factor of coaxial/100 MHz |
no more than 0,52 db/m |
Mechanical
Breaking strength not less than 2 kN Umbilical's weight nj more than 94 kg/km Rated floatage 0 +/-2 %