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NaviPac Cable Laying Utilities
Author : Ole Kristensen
Company : EIVA a/s
Date: April 2012
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Introduction This document gives a short introduction to the catenary functions (for cable and pipe laying)
found in NaviPac as it is – and lists a series of ideas for improvement of the functionality
Contents NaviPac Cable Laying Utilities ................................................................................................. 1
Revision table............................................................................................................................. 2
1 NaviPac 3.8 ........................................................................................................................ 2
1.1 Cable over length ....................................................................................................... 2 1.1.1 Definition in HD .................................................................................................... 4
1.2 Barge run-lines ........................................................................................................... 7 1.3 Catenary monitoring ................................................................................................ 10 1.4 Interface to CMS ...................................................................................................... 12
2 Next generation ................................................................................................................ 12
2.1 NaviCat .................................................................................................................... 13 2.2 Cable Lay ................................................................................................................. 15 2.3 3D Display ............................................................................................................... 15
Revision table
Date Who Comment
10-5-2004 OKR Document created
22-9-2004 OKR Added section 2.2
26-4-2012 OKR Upgraded to version 3.8
More details on HD control
1 NaviPac 3.8 The actual NaviPac version includes a series of functions, which might be used during cable
or pipe laying jobs. Most of these have been designed in close cooperation with various
clients using these features for laying jobs over the last years.
1.1 Cable over length
A typical scenario in laying a cable is that you end up having more cable than the remaining
line – to avoid cutting the cable; a term called “Cable over length” is introduced. Following a
set of rules, a new run-line is created to obtain the wanted length.
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Inserting an overlength route may now change each segment:
with the result showed graphically:
A run-line is defined with
a total length of 1248
meters.
But the remaining cable is
1275 meters – ie. Adding
27 meters in total.
The operator may
define route
criteria and
monitor the
changes before
accepting them.
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1.1.1 Definition in HD
To activate the feature just follow the steps in Helmsman’s Display:
Edit the runline; in page Segments double click (edit) a STRAIGHT segment (probably the last (or
first) segment); select Main page; select Wave Route (overlength) option and the overlength dialog
will pop up. From here on it’s just a step-by-step procedure.
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1.2 Barge run-lines
To obtain the best possible laying operation – especially in the so-called S laying mode – the
touch down point (where the cable/pipe hits the bottom) is a certain distance behind the
laying barge.
Before a job is started, the system is fed with the planned route – which can be used as run-
lines in the helmsman’s Display. But with a layback touch down point there a difference
between the planned route and the route to be followed by the barge.
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NaviPac offers a tool called Barge run-lines, where we based on planned route and layback
determines the actual line.
HD with display of planned route
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HD with graphical result shown.
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1.3 Catenary monitoring
During the laying process, a very important factor is monitoring the total amount of cable out
(in the water column), the tension in the cable and how much the cable is bending.
NaviPac offers a simple catenary monitoring tool – which based on the winch point (where
the cable leaves the barge) and the touch down point (where the cable hit’s the seabed –
monitored with ROV or similar).
It done by defining two objects in NaviPac – one for the leaving point (typically an offset on
the vessel) and one for the touch down point:
A catenary monitoring (up to 5 simultaneously) may now be defined:
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The optimal calculation is obtained by inputting weight of catenary cable.
The result may be monitored (any computer on the network) as alphanumerical displays:
The most interesting value to watch for the operator is normally the Vertical Angle (Theta) that is the angle of
the catenary curve.
Horizontal Distance (X):
Definition of calculations:
- Name
- Input parameters
- Leave point
- Touch down point
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This field gives the horizontal distance between the two points.
Vertical Distance (Y):
This field gives the vertical distance between the two points.
Vertical Angle (Theta):
Hold the vertical angle of the catenary curve.
Length of Catenary (L):
Hold the computed length of the catenary curve.
Min radius of catenary curve ®:
The computed min. radius of the catenary curve
Horizontal Tension (H):
If a unit weight is specified the horizontal tension is shown here.
Vertical Tension (V):
If a unit weight is specified the vertical tension is shown here.
Total Tension (T):
If a unit weight is specified the sum of vertical and horizontal tension is shown here.
1.4 Interface to CMS
NaviPac includes, if operated in TMS/RigMove mode, an interface to a special Stolt Offshore
Catenary Monitoring System (Halliburton Subsea CMS )
It output’s information about barge and anchor locations, and offers the receiving program
sufficient information to document behavior of the anchor chains. Details on formats can be
obtained from NaviPac manuals.
2 Next generation During the use of NaviPac for barge and laying operations, and lot of new ideas has been
raised from a.o. Subsea7, C&C Technology and Capital Signal, and we are based on these
input’s working of projects to include these ideas in standard NaviPac operations.
This has resulted in a CableLay add-on to NaviPac developed in cooperation with the Danish
company JD Contractors.
C/B Henry P. Lading
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The system is build around NaviPac, as all sensor interfacing and recording takes place here.
The system requires special data input of
- Cable output angle
- Cable length
- Cable tension
Based on those inputs the system calculates the catenary curve in the water and estimates the
touchdown point.
Please note that cable interfacing is most often different for each vessel, so tailor-making
must be expected!
2.1 NaviCat
The brain in the system is the EIVA catenary solution, which performs a full 3D calculation
of the cable in the water column and along the seabed.
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The catenary model is based on a 3D particle system and allows full computation of forces
along the chain. This model can be expanded to include external forces such as current.
The system loads terrain information (DTM, profile or fixed depth) and used this for the
touchdown estimation and cable curvature calculations.
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2.2 Cable Lay
The Cable Lay module is program running beside NaviPac (same pc or remote) and it gives
the cable operator the needed displays to monitor cable speed, angle, bending radius etc.
This module is also responsible for the cable amounting, and thus a very important tool.
2.3 3D Display
The cable lay scenario can be connected to NaviPac Online3D, and thus give a user friendly
visualization of the entire project:
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