Available Engineering Services
With a focus on engineered solutions combined with our global experience, we have the technical services you need for your mooring system or subsea installation
Delmar’s engineering team specializes in the design, analysis, and installation of temporary and permanent mooring systems. Additionally, we apply our unique experience to analyze and plan subsea equipment installation projects. The objective of our technical team is to pioneer and apply advanced analysis techniques to to deliver engineered solutions with the utmost reliability. We provide detailed engineering and analysis that is integrated with installation planning and vessel utilization strategies in order to minimize the offshore operational costs.
Mooring Analysis and Design
Delmar’s technical team provides the very latest in high-end integrated motion mooring analysis services. Our mooring model includes independent motion characteristics generation utilizing a 20-year proven diffraction method hydrodynamic module that ties directly into the frequency and time-domain mooring analysis modules. Delmar’s proprietary bolt-on programs provide the added capability of:
- Full line geometry, component tensions, and mud-line loading conditions via DelCat™ bolt-on.
- Corresponding anchor trajectories, loading, catenary-soil effects, and capacities via DEAP™ and OMNI-Max™ tool bolt-ons.
- Accounting for anchor movement, non-linear synthetic rope stiffness, creep, permanent elongation effects in the mooring analysis
Delmar’s mooring analysis program is an integrated motion-mooring program that has been designed for multi-purpose multi-body hydrodynamic and mooring analyses of floating and/or fixed structures including:
- Static and dynamic initial stability including the effects of mooring systems and other physical connections
- Frequency domain dynamic analysis
- Time domain with irregular waves including slow drift
- Non-linear time domain with large amplitude regular or irregular waves
Delmar engineers provide offshore technical support to assist with the installation and recovery of all mooring systems. This offshore support includes:
MODU Mooring Installation and Recovery Assistance includes:
- 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 mooring component does not come into contact with the rudders of the anchor handling boat (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 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.
The Bruce DENNLA (Drag Embedment Near Normal Load Anchor) can be preset ahead of rig arrival on location for systems where taut or semi-taut (minimal grounded length) systems are being used. Delmar can provide technical support to monitor the line catenaries as the anchors are being set and later proof-loaded.
Once the AHV (anchor handling vessel) has set the DENNLA on bottom near the proposed anchor location, it begins to pay out mooring components as it moves away from the anchor down the proposed heading of the mooring line. Once a sufficient amount of component is paid out, the vessel powers up. Excessive uplift or bollard pull may result in the anchor slipping, causing lost time with it needing to be reset. Too little power may result in the anchor not penetrating properly.
Once the DENNLA is set, the AHV will back off of its power and recover component until there will be ~40° of uplift at the anchor for the pin shear condition. Once this has been done, the boat will again power up and put sufficient tension at the anchor to shear the pin. It is extremely important for the catenary to be monitored in this condition because again, too high of an anchor angle may result in slippage. Too little power or insufficient uplift may result in the pin not shearing.
Delmar’s OMNI-Max® anchor is a gravity-installed VLA (vertically loaded anchor). The anchor has a 360° rotating arm so that it can be loaded in any direction which can be important in cases such as multiple line failures during an extreme storm event or if it is planned to do several batch operations from the same mooring pattern by winching the vessel around a field (without moving anchors).
Delmar can provide technical support in the field to make sure the OMNI-Max anchors are installed properly.
- Water depth verification at seabed
- Anchor tip depth verification (just before anchor release)
- Released anchor location
- Arm heading verification (just before anchor release)
- Measured anchor tip penetration (note any differences to calculated penetrations if soil data is available)
- Shear pin data (if applicable)
For recovery, it is important to note the new anchor tip penetration prior to pulling the anchor out of the mud, especially if the line was subjected to any high tensions from a storm event. Once the new penetration has been calculated, the maximum recovery tension needed by the winch on the anchor handling vessel is logged as well.
Anchor Technology and Mooring
Delmar offers 3 types of anchor technology:
- DEAP™ Anchor Analysis Tool – the Delmar Engineering Anchor Program (DEAP™) is an anchor analysis tool that predicts the performance of various types of anchors including drag embedment, vertically loaded anchors, suction piles, and OMNI-Max anchors. To learn more about our DEAP, click here
- OMNI-Max® Anchor – The patented Delmar OMNI-Max anchor is a multi-directional, self-inserting, gravity-installed anchor. To learn more about OMNI-MAX, click here
- Mooring Design and Analysis – Delmar has extensive experience in the design of all types of mooring systems in a wide range of water depths. Using this experience, Delmar optimizes mooring systems designs on a site-specific basis providing a high performance mooring system which can be installed safely and efficiently.
Risk and Environmental Consulting
Delmar’s Engineering group provides comprehensive risk assessments for MODU mooring in hurricane and cyclonic metocean conditions. Including the results from a site-specific cyclonic mooring analysis defining the survivability of the mooring system, the risk assessment provides risk profiles for the MODU’s activity on location in cyclonic meotcean conditions.
Delmar also provides risk consulting for jack-up rigs using multiple calculations to ascertain each risk event, including events specifically associated with Jackup Rigs including:
- wind/wave overturn
- wave slamming
- sufficient air gap calculations
Delmar’s risk consulting for DP MODUs calculates time to transit based risk including:
- time to pull riser, secure well, and outrun storm
- probabaility of getting caught by a hurricane or cyclone
- consequence of getting caught
Delmar’s ConStat™ Risk program is the leading industry assessment tool used to evaluate the risk associated with Mobile Offshore Drilling Unit (MODU) mooring locations during hurricane and cyclone seasons. ConStat™ was the first full MODU mooring risk assessment tool offered to the industry in the wake of Hurricanes Ivan, Katrina, and Rita and has been licensed to the US government for Gulf of Mexico mooring location approval. ConStat™ has evolved since 2006 with the input from regulators, industry experts, and participants in the 2007 MODU Mooring Risk Assessment JIP.
ConStat™ contains several key features that make it the most sophisticated and widely utilized assessment tool available to the industry today:
- Asset Database
- Delmar Wind Field Modeler
- MODU Mooring Risk Assessment JIP Risk Model
- Historical Hurricane Database
- Delmar Gulf of Mexico Production Matrix
Tropical Cyclone Modeler
The Delmar Tropical Cyclone Modeler includes the NOAA historical hurricane track database. All of the tropical storms and hurricanes in the Atlantic from 1900–current are built in.
Delmar also maintains a similiar database for cyclones affecting Australia’s Northwest Shelf.
Geotechnical & Hydrodynamic Analysis
Delmar’s team of mooring and geotechnical engineers provide geotechnical support in assessing site-specific soils conditions and determine the best foundation to be used for anchoring based on the application and soil properties.
Using the raw geotechnical data for a location, Delmar derives undrained shear strength profiles for use in determining the in-place performance and ultimate holding capacity under the specific design loads.
The dynamic vessel response in irregulars seas is critical for making design and operational decisions. Using state of the art radiation/diffraction software, ANSYS® AQWA™, Delmar engineers determine the six degree of freedom motion response for specific hull shapes (Spar, semi-submersibles, workboats, buoys, TLPs, etc.) and loading conditions. The calculated response of the vessel is captured in a database, forming the foundation for further job specific considerations. The following task specific analyses build upon this hydrodynamic foundation:
- Mooring analysis
- Riser analysis
- Tow analysis
- Offshore lifting analysis
- Offshore lowering analysis
- Seafastening analysis
- Floatover analysis
- Berthing analysis
- Dropped object analysis
Delmar provides a hydrodynamic database for specific vessels as a stand alone deliverable or can follow through with providing a more specific scope of work.
- Optimize vessel motions
- Reduce weather downtime
- Hull design assessment
- Hull upgrades
- Alternative energy
- Defense industry
- Model test calibration
- Air gap studies
- Shielding effects of ships and barriers
- Concept selection studies
Advanced hydrodynamic capabilities include:
- Multi-body interaction
- Shallow water effects (Full QTF, near/far field solutions)
- Non-linear fendering and hawser coupling
- Forward Speed
Subsea and Special Equipment Design
Delmar offers a variety of open water and MODU-assisted subsea installation capabilities. We offer our clients an extensive list of off-the-shelf commercial and Delmar-proprietary tools and equipment needed for your projects. If that specialty piece of equipment does not exist, we work with you to help design unique cast, fabricated or forged tools or equipment needed 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 tools necessary for Delmar’s projects, or when we think a safer and more efficient design is possible, Delmar designs its own specialized equipment and tools for the job. This equipment has included 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.
Suction Pile Design
Delmar is the industry leader in suction pile design and installation. With a track record that spans more than 500+ installations and retrievals, Delmar has an unmatched database of suction pile data. The engineering group uses the suction pile database to design new suction piles with unmatched efficiency; the database takes much of the guesswork or margin out of pile design that other firms would have to include. Delmar-designed suction piles have enjoyed a 100% success rate largely due to our data collection and structured design process.
Delmar uses several different techniques to analyze its suction pile foundations. The most sophisticated includes Finite Element Analysis of the pile structure, the surrounding soil, and the soil plug inside the pile. Depending on the application and previous analysis, more simplified modeling techniques may be used. Delmar has built an extensive database for mooring pile anchors for use in the Gulf of Mexico.
Due to significant advancements in design, the Delmar Subsea Connector is now offered in several configurations for permanent use with long-term production facilities that have a wide variety of mooring components.
Delmar has also developed the tools necessary to make suction pile anchors a safer, more cost-effective anchor foundation option for both temporary drilling rigs and permanent floating production facilities. As Delmar continues to install and retrieve suction piles, Delmar remains committed to further enhancing this technology.
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. The models are an excellent way to showcase our products and help clients better understand the technology and its applications.
Vessel Design Support
Delmar’s Engineering Group assists in several aspects of new vessel design and vessel upgrade projects. Delmar uses several types of analysis tools that provide detailed technical support of vessel design, including:
- 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 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 hurricane 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 points during storm conditions to properly design 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.
Delmar Systems, Inc. towing analysis is a fully coupled time domain analysis. It can be used to verify that the selected tow vessels are adequate for the operation and identify weather limitations with set bollard pull and line tension criteria. State-of-the-art marine software packages are used for the analysis. ANSYS® AQWA™ is used to generate six degrees-of-freedom response amplitude operators (RAOs) and wave drift force (WDF) coefficients for all vessels involved. Orcina OrcaFlex™ is used for the global modeling and time domain tow simulation for the metocean cases and directions of interest.
- Fully coupled multi-body time domain dynamic analysis
- Independent six degrees-of-freedom hydrodynamic vessel panel models
- Full equipment configuration / tow line properties modeled
- Site-specific directional metocean
Tow analysis objectives include determining if tow vessel(s) can maintain a forward rig speed and control of rig, maximum tow line tensions, and bollard pull recommendations for specific weather scenarios.
- 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