Submarine Cable Design Calculator

Model the catenary profile of submarine cables and umbilicals — compute layback distance, cable length, top tension, and departure angle for installation engineering.

Inputs

Water depth (m)

Submerged weight (N/m)

Horizontal tension (N)

Hang-off height above WL (m)

Cable outer diameter (m)

Cross-current velocity (m/s)

Cable drag coefficient

Tab to move between fields

Results

Layback distance (m)

290.24

Suspended cable length (m)

316.39

Top tension (N)

25,500

Catenary parameter a (m)400

Departure angle (°)38.34

Suspended weight (N)15,819.3

Lateral current drag (N)5,837.3

How to Use This Calculator

Enter water depth (m), cable submerged weight (N/m), and horizontal tension (N) at the touchdown point.
Enter hang-off height above waterline (m) and cable outer diameter (m).
Read catenary shape parameters: top tension (N), lay-back distance (m), and touchdown angle (degrees).
Verify maximum curvature against minimum bend radius — violation causes cable damage.
Use lay-back distance and water depth to plan vessel positioning during installation.

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