Delmar Systems can help assess your high-profile towing operations by verifying the adequacy of tow vessels and identifying weather limitations with set bollard pull and line tension criteria. Six degrees-of-freedom Response Amplitude Operators (RAOs) and Wave Drift Force (WDF) coefficients are utilized for all vessels involved in the global modeling and time domain tow simulations for the metocean cases and directions of interest.
- Tow line tension statistics
- Tow speed statistics
- Tow vessel bollard pull recommendations
- Rig course made good (CMG) deviations
- Tow vessel heading deviations
- Travel distances over time
Delmar Systems engineers provide offshore technical support to assist with the installation and recovery of mooring systems and subsea equipment. 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.
Subsea and Special Equipment Design
Delmar Systems offers a variety of open water and MODU-assisted subsea installation capabilities. We offer our clients an extensive list of off-the-shelf commercial as well as Delmar-proprietary tools, and the equipment needed for your projects. If you have a need for a specialty piece of equipment that does not exist, we work with you to help design unique cast, fabricated, or forged equipment for your project.
Tool and Special Equipment Design
Delmar has developed numerous patented equipment designs while maintaining the highest standards of engineering and fabrication qualifications. When the industry does not offer the tools necessary for your projects, or when we think a safer and more efficient design is possible, Delmar designs our own specialized equipment and tools for the job. Examples of past equipment we have developed includes both on-deck and subsea anchor-handling equipment, quick release devices, subsea connectors, anchor foundations (OMNI-Max and pile anchors), storage devices, A-frames, wire and rope spooling units, synthetic rope handling equipment, and various other unique tools and handling devices.
In addition, Delmar has designed mooring components, such as the patented Delmar Subsea Connector (DSC), Delmar Quick Release (DQR), Delmar Chaser Stopper (DCS), the RAR Plus, submersible buoys, buoy swivels, chain chaser stoppers, and wide-body chasers.
Through an efficient combination of Delmar’s extensive offshore operational experience and technical capabilities, Delmar can assist in designing new anchor handling and other offshore devices and procedures.
Rapid Prototyping / 3-D Printing
Delmar is able to create 3-D models of its tools, anchors, and piles in a very short period of time for client and internal testing or presentation purposes. As life extension projects become more and more prolific, so does the need to model existing equipment, which can be 3-D scanned and printed to ensure proper fitment and other operational constraints are properly accounted for in your life extension project.
Vessel Design Support
Delmar Systems assists in several aspects of new vessel design and vessel upgrade projects by using analysis tools to examine the following:
- Vessel RAOs
- Heave Amplitude Optimization (semi)
- Heave Peak Period Optimization (any floater)
- Roll Amplitude Optimization (ship shapes)
- New Vessel Designs
- CALM, Flare, Terminal Buoys
- Coupled Vessels
- Vessel Airgap
- Free Floating Airgap
- Moored Airgap
- Mooring Analysis
- Quasi-Static Analysis
- Motion-Mooring Analysis
- Time Domain Analysis
- Line Dynamic Analysis
- Statistical Motion Analysis
- Motions, Velocities, and Accelerations
- Winch Foundations
- Derrick Design and Foundations
- Crane Foundations
- Installation Analysis and Procedures
With this analysis ability, Delmar assists in developing or adapting various vessel designs.
Delmar also minimizes drilling rig heave motions to reduce riser handling wear and tear. Extending the rig heave natural period increases the mooring performance of the rig in TRS conditions. It can also reduce the permanent production facility heave motions to save in riser design considerations and monitor roll motions of FPSOs to determine the limiting weather conditions for active production through process equipment.
Delmar’s expert personnel track point motions for the derrick foundation during storm conditions which aids in properly designing the connection point and derrick structure.
Delmar also assists in heavy-lift operational engineering. Motion mooring analysis can predict the limiting sea states for such lifting operations as placing topsides on Spar-type vessels. Delmar’s airgap analysis can help determine what storm draft a drilling rig should maintain to assure no under deck slamming.
With ultra-deepwater rigs operating in DP or moored modes, Delmar can assist with the design of both the rig components for connection to the preset portion and the preset system itself. Delmar has extensive working experience with performance fibers like polyester, having designed and installed polyester moorings in ultra-deepwater depths.
With its in-house operational expertise, Delmar engineers not only design top-performing deepwater moorings, but also systems that are safe and efficient to install and move. Delmar provides detailed installation procedure drawings, design installation equipment foundations and construction drawings for specialized equipment needed for the project.
These jobs have typically included detailed front-end planning and engineering, as well as coordination for mobilization of equipment offshore. Delmar continues to offer its expertise throughout the life of the project, providing offshore job coordination and supervision.