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Towed cable systems

Description

The cables of this group are designed for power supply and communication with depth equipment, lowering-rising operations, towing different equipment and similar work.

The main part of this group is a load carrying armoured cable.


Specifications

Two variants of design of a coaxial deep-see cable are shown on figure 1. The first cable has a two-winded steel armour and other has an armoured sheath.  

KGP 1-190 (variant 1)                                                                                   
KGP 1-190 PL-20,0 Oa  (variant 2)

Picture 1

Pos.

Name of element of construction

Material of element, dimension

Diameter mm

Variant 1

Variant 2

1

Current conductor

Soft copper wire (4,0 mm2)

2,6

2,6

2

Insulation

LD polyethylene

9,0

9,0

3

Screen

1) soft copper wire, soft copper tape 

10,0

10,0

4

Taping

TapePET-E

10,2

10,2

5

Insulation of screen

LD polyethylene

13,4

12,5

6

First wind of armour

1) Steel galvanized wire 

2) Steel galvanized wire 

16,5

15,5

7

Second wind of armour

1) Steel galvanized wire 

2) Steel galvanized wire   

20,0

18,6

8

Protective sheath

LD polyethylene

 -

20,0

Main parameters

Electrical:

Resistance of current conductor, not over

4,89 hm/km

Resistance of insulation of conductor, not less

20000  Mhm/km

Resistance of screen, not over

3,2 hm/km

Resistance of insulation of screen, not less

20000 hm/km

Impedance 5 Hz

50 +/-5 hm

Attenuation ration frequency 1 Hz

4 +/-1 dB/km

Attenuation ratio frequency  5 Hz

10 +/-2 dB/km

MechanicalVariant 1 Variant 2

Weight of cable in air, not over

1300.850 kg/m

Weight of cable in water, not over

536..195 kg/m

Breaking strength, not less

190...100 N

OOO Pskovgeokabel produces large range of cables for towing different equipment and tools behind a vessel. The most interesting cables are shown on picture 1,2.

EGN

Picture 2

Pos.

Name of elements of construction

Material of element of construction,

Dimensions

Diameter, mm

  1

Current conductors of excitation

Copper,  (2,1 mm2)

1,85

  2

Insulation of conductor of excitation

Copolymer propylene 

Colours: 1pc.-natural. Periphery: 1 pc.-natural, 1 pc.- red, 1pc.- blue, 1pc.- green

3,5

3

Optic fiber module

Standard single mode fiber in copolymer sheath

0,85

 4

Sheath of optic fiber module power conductor

Copper tube 1,0/1,62

1,62

5

Insulation of module (conductor)

Copolymer propylene

3,3

6

Screen

Aluminium foil

3,5

7

Core of cable with longitudinal hermetization

Polyisobutilen on central core

10,5

8

Intermediate sheath

LD polyethylene  D =1,75 mm

14,5

9

First wind of load carrying element

Galvanized steel wire, 301,50 mm

17,3

10 

Second wind of load carrying element

Galvanized steel wire, 361,50 mm

20,3

Main parameters

Electrical:

Resistance of conductor of excitation, not over

10 hm /km

Resistance of conductor of copper sheath of module, not over

25 hm/km

Resistance of insulation, not less

10000 hm*km

Optical

Signal attenuation on length waive 1,55 mkm, not over

0,7 dB/km

Mechanical

Breaking load

200 10 kN

Maximum operating load

150 kN

Weight of cable not over

1250 kg/km

Sections of cables used for towed cable systems are shown below. The typical dimensions of cables comprise the range up to 32 mm for the cable KG-32, which is the heavy towing cable; light cables can be made with diameter up to 9 mm ( 2(0,7+1)+20,35-55-60). Operating loads consist consequently 150 and 25 kN. The cables contain power and signal conductors and optic fibre channels for transmission of information. 




KG-32 KG (30,2+31)-60-60 KG 2(0,7+1)+20,35-55-60

 Fig. 3




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