Delmar System engineers provide offshore technical support to assist with the installation and recovery of all mooring systems. Our offshore support includes a wide variety of products and installation methodologies.
MODU Mooring Installation and Recovery Assistance
• Model line catenaries both real time and in the future
• Provide positioning guidance for all vessels
• Calculate component payouts needed to make preset connections safely and efficiently
• Monitor rudder clearances to anchor handling vessels during preset connections
• Assisting with anchor placement for conventionally installed systems
• Calculating mooring loads for proper load sharing between vessels
Modeling Line Catenaries
Our Del-Cat mooring software is used to calculate mooring line catenary shapes throughout the entire mooring process. Clearances to any assets (such as pipelines, umbilicals, etc.) are noted. Catenaries are also modeled ahead of time to determine boat positions and payouts necessary to help make safe and efficient connections or disconnections.
Monitoring Rudder Clearances
As mooring operations are being conducted, it is necessary to ensure that the mooring component does not come into contact with the rudders of the anchor handling boat/vehicle (AHV). Sometimes it is required for the AHV to turn the boat heading in order to make preset connections and disconnections. If sufficient component is not paid out by the MODU or AHV, rudder contact can occur. This contact can then lead to damage to the AHV’s rudder or mooring equipment, which can be especially critical if operations are being conducted over assets.
For conventionally installed mooring systems, the anchor is stretched with the AHV after the proper components are paid out by the rig. Therefore, the anchor placement is highly dependent upon the payouts and vessel positions at the time the anchor is set on bottom. Delmar can run catenaries in these cases to assist with getting the anchor closer to the proposed position. Modeling the stretch of the line is also important to ensure much of the mooring component is off bottom prior to cutting power on the AHV and setting the anchor in the mud.
Especially for cases with heavy mooring component, like with long chain sections, it is important that the rig and anchor handling vessel load share the weight of the mooring component. If too much weight is supported by one side during installation or recovery, damage to the winch can occur. Delmar can run catenaries and calculate mooring weights to help ensure a safe operation and mitigate equipment damage.