Glossary
GLOSSARY OF TECHNICAL TERMS
We define below certain terms helpful to understanding our drilling and sub-sea engineering services.
| ABS | American Bureau of Shipping |
| AHTS | Anchor Handling, Tug and Supply vessel |
| BOP | Blow Out Preventer |
| BV | Bureau Veritas |
| deepwater | For dive support, this usually refers to water depths beyond
300 meters
In relation to drilling : General Classification : The rig classification comprises “5th Generation Deepwater”, which refers to the latest generation of semisubmersible rigs and drillships possessing the latest technical drilling capabilities and the ability to operate in water depths in excess of 7,000 feet, “Other Deepwater”, refers to semisubmersible rigs and drillships that possess the ability to drill in water depths equal to or greater than 4,500 feet. “Other Floaters” represents semisubmersible rigs and drillships that possess the ability to drill in water depths of up to 4,499 feet A tender requires a platform to drill from. Normally, depths of more than 300 feet will require a modified mooring arrangement and depths of more than 600 feet will a require pre-laid mooring arrangement. Tenders can be moored in up to 6,500 feet by use of a pre-laid mooring arrangement |
| dive support vessel | Specially equipped vessel that performs services and acts as an operational base for divers, remotely operated vehicles and specialized equipment |
| DNV | Det Norske Veritas |
| DP-2 | Dynamic position 2— redundancy allows the vessel to maintain position even with failure of one component or subsystem, required for vessels which support manned diving operations |
| DP-3 | Dynamic position 3— fully redundant positioning system allowing continued station keeping with the loss of one complete system |
| DP DSV | Dynamically positioned dive support vessel |
| drilling | Includes drilling, workover and completion |
| Drilling Equipment Set | Consists of the substructure, drill floor, derrick and draw works and other related equipment |
| dynamic positioning or DP |
Computer-directed thruster systems that use positioning technologies to ensure the proper counteraction to wind, current and wave forces, enabling the vessel to maintain its position without the use of anchors |
| EPIC | Engineering, Procurement, Installation and Commissioning |
| IMCA | International Marine Contractors Association |
| IMO | International Maritime Organization |
| IRM | Inspection, repair and maintenance |
| LOA | Length overall |
| MODU | Mobile offshore drilling units |
| Moonpool | An opening through the hull of a vessel through which a diving bell or other equipment may be deployed |
| OPEC | Organization of the Petroleum Exporting Countries |
| remotely operated vehicle or ROV |
Robotic vehicles used to complement, support and increase the efficiency of diving and sub-sea operations and for tasks beyond the capability of manned diving operations |
| saturation diving | Saturation diving, in water depths up to 300 meters, involves divers working from diving bells for extended periods at a pressure equivalent to the pressure at the work site |
| SPS | Special periodic survey |
| sub-sea construction vessels | Sub-sea services are typically performed with the use of specialized construction vessels which provide an abovewater platform that functions as an operational base for divers and remotely operated vehicles. Distinguishing characteristics of sub-sea construction vessels include dynamic positioning, saturation diving capabilities, deck space, deck load, craneage and moonpool launching. Deck space, deck load and craneage are important features of the vessel's ability to transport and fabricate hardware, supplies and equipment necessary to complete sub-sea projects |
| tender rigs | A tender rig is normally a purpose-built self-erecting drilling tender barge with a flat bottom, raked stern and raked bow hull shape. The self erecting tender rig is designed as a costefficient and flexible drilling system for development scenarios involving multiple well slot fixed offshore platforms whereby the rig moves from platform to platform using its own Drilling Equipment Set which is lifted on by its own crane. Lifting operations can be made onto platforms up to a height of 30 meters above mean sea level |
| TWI | The Welding Institute |
| WOW | Waiting on weather |