GM Catenary

GM Catenary Single Line Catenary Software


GM Catenary is a single line 2D catenary analysis software designed for analysis of moorings or towing lines. The software has been developed for the marine marketplace where mooring and towing operations are proposed. GM Catenary is a useful toolkit for surveyors and others responsible for anchor running and towing operations.

GM Catenary is an invaluable tool on tugs, anchor handling and all spread-moored vessels, where it supports mooring analysis and provides quick, efficient and detailed results of catenary line problems when addressing pay-out and clearance issues.


Mooring line entanglement with subsea assets is a costly business in terms of asset integrity and pollution risks. This software provides instant assurance of clearance issues associated with mooring lines that cross subsea assets. Proposed changes in mooring line makeup are easily accommodated and various changes can be readily compared. Clearances from known subsea assets are tabulated for ease of reference. In addition, catenary line properties can be assessed on range, pay-out or tension properties.

The software accommodates touchdown of mooring lines for accurate representation of clearance issues. It also accommodates mooring line development while running anchors, in that the anchor can be at the stern of an anchor handling vessel or on a length of pennant. In addition, the programme addresses tow-line dip for tow operations, which is particularly important when tow operations are being conducted in shallow water. By simple mouse placement, clearance issues of a mooring line at any point along its length can show distance from the anchor fairlead, distance from the anchor, and height of the mooring line above the seabed, or below the sea surface. This is useful in assessing draft available alongside a moored vessel during supply type operations.

Key Capabilities

The key capabilities of the software are:

  • Multi-component. There is no limit to the number of components
  • Buoys or clump weights. Inter-components can be buoys (surface or subsurface, with or without a pennant) or in-line clump weights (e.g. concrete blocks)
  • Anchor end can be off seabed. The anchor can be off the seabed (e.g. to model on deck of tug, or modelling a tow)
  • Intermediate grounding allowed. The line is allowed to ground between two buoys, or between anchor and fairlead, if the anchor is off the seabed
  • Automatic clearance calculation. Calculates clearance to specific objects (e.g. pipelines), as well as depth of line and height above seabed
  • Sloping seabed. The seabed is modelled as a straight line between the fairlead and anchor, which can be level or sloping
  • Elastic lines. The line elasticity can be modelled by linear, quadratic and cubic elastic coefficients
Purchase Information

GM Catenary is sold as a one off download per user for unlimited use. The software is fully supported by a robust support team, who is on hand to assist with any questions.

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