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Anchors and Foundations

Anchors and foundations

ANCHORS AND FOUNDATIONS

Delmar Systems offers anchor and subsea foundation design, assessment, and installation / removal services for several applications. From the Delmar Engineering Anchor Program (DEAP), our proprietary anchor analysis software that accounts for the coupled interactions between the mooring line and the attached pile, drag embedment, vertically loaded or gravity-installed anchor, to our history of custom pile and skirted foundation design dating back to the 1990’s, we have a solution for your project.

Delmar offers 3 types of anchor technology

  • Suction and driven piles / skirted foundations are often used for subsea tie-backs, hold-backs or parking equipment, as well as traditional mooring anchors, and Delmar has been designing, building and installing them for decades. A few notable examples - One of Delmar’s earlier custom pile designs was used in 2000 to raise the SS Hunley, a submarine that sank in 1864; a later custom design was used in 2008 as the first mooring anchor pile to be used successfully in Mexican Gulf of Mexico waters.
  • The OMNI-Max® Anchor is an in-house designed patented anchor that allows for rapid deployments and multi-directional loading.  The anchor is a self-inserting, gravity-installed Vertically Loaded Anchor (VLA) that is deployed with the speed of a torpedo anchor and the capacity of a suction pile of ~3x the size.
  • Modern drag anchors are largely divided into two categories; Vertically Loaded Anchors (VLA's) which are primarily used for taut mooring systems and High Holding Capacity (HHC) drag anchors, which are primarily used for catenary mooring systems. Delmar can analyze the site-specific capacities of any of these anchors and has a large inventory to fit your specific project.

Suction Pile Design

Delmar is the industry leader in suction pile design and installation. With a track record that spans 500+ installations and retrievals, Delmar has an unmatched database of suction pile data, which is used 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.

Delmar has also developed specialized tools, such as the Delmar Subsea Connector, to make suction pile anchors a safer, more cost-effective anchor foundation option for both temporary drilling rigs and permanent floating production facilities.

OMNI-Max

Delmar’s OMNI-Max® anchor is a gravity-installed Vertically Loaded Anchor (VLA). 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. Other technical support includes:

  • 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)

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.

DENNLA

Delmar Systems has installed more Bruce DENNLAs (Drag Embedment Near Normal Load Anchor) globally than any other mooring installation company. The Bruce DENNLA is a Vertically Loaded Anchor (VLA) with unique characteristics that require intimate knowledge of the anchor mechanics to install properly.  Delmar maintains a fleet of these anchors for use in temporary mooring activities globally, and has the in-house expertise to utilize them properly.

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