Delmar provides a wide variety of mooring systems to fit any mooring application.
Most semisubmersible drilling rigs are fitted with conventional chain or combination chain and wire catenary mooring systems. This is most commonly used in traditional mooring configurations.
When a rig's conventional catenary mooring system is not sufficient for a proposed water depth, the length of the mooring legs can be increased with the addition of extension wires in each mooring leg. This enhancement extends the length of the mooring legs for the rig, allowing the rig to operate in greater water depths. Delmar has pioneered the use of this method, extending the water depth capability of traditional shallow water rigs.
For upgrading a rig's mooring system for a desired water depth or as special location conditions dictate, it may be cost-effective to pre-install an enhanced mooring system for the drilling location. Anchors, chain, and wire can be installed on the location before the rig arrives and off the critical path time of rig operations.
Synthetic mooring components are used in ultra-deepwater applications where a rig is constrained by the weight of a traditional steel/wire/chain mooring system. Used in combination with traditional mooring components, synthetics extend the water depth capabilities of existing rigs for an efficient and effective mooring solution. Delmar was the first to use synthetics in the Gulf of Mexico, resulting from a 1999 JIP test. As a result, Delmar designed, procured, and installed the world's first semi-taut steel-polyester-steel MODU system of this type and the only one to ever experience repetitive use. This unique system incorporated the patented Delmar Subsea Connector and Installation Method to efficiently deploy ultra-deepwater moorings using a single anchor handling vessel with the ability to deploy the anchor separate from the mooring leg.
The OMNI-Max is a multi-directional, self-inserting, gravity installed anchor. Relatively small in size, the anchor offers high capacity, high uplift and genuine out-of-plane loading capabilities not found in other traditional anchor foundations. The anchor is capable of maintaining sufficient capacity at high uplift angles with any pull direction—360° around the axis of the anchor. This unique feature increases station-keeping reliability during storm events.
Suction anchors are used in ultra-deepwater for systems requiring taut or semi-taut preset mooring systems. The anchor is embedded using an ROV (remotely operated vehicle) to pump water out of the top of the caisson until the anchor is fully penetrated into the seabed. The process is simply reversed to recover the anchor.