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The unit may be either afloat or supported on the sea-bed, as applicable. 2, Severe storm conditions" - conditions wherein a unit may be subjected to the most severe environmental loading for which the unit is designed Drilling operations are assumed to have been discontinued due to the severity of the environmental loading. 1, Operating conditions" - conditions wherein a unit is on location for the purpose of conducting drilling operations, and combined environmental and operational loadings are within the appropriate design limits established for such operations The unit may be either afloat or supported on the sea-bed, as applicable. The modes of operation of a unit include the following: For the purpose of this Code, unless expressly provided otherwise, the terms used therein have the meanings defined in the following paragraphs.ġ.3.1, Mobile offshore drilling unit" or "unit" is a vessel capable of engaging in drilling operations for the exploration for or exploitation of resources beneath the sea-bed such as liquid or gaseous hydrocarbons, sulphur or salt.ġ.3.2, Surface unit" is a unit with a ship- or barge-type displacement hull of single or multiple hull construction intended for operation in the floating condition.ġ.3.3, Self-elevating unit" is a unit with movable legs capable of raising its hull above the surface of the sea.ġ.3.4, Column-stabilized unit" is a unit with the main deck connected to the underwater hull or footings by columns or caissons.ġ.3.5, Administration" means the Government of the State whose flag the unit is entitled to fly.ġ.3.6, Coastal State" means the Government of the State exercising administrative control over the drilling operations of the unit.ġ.3.7, Organization" means the International Maritime Organization (IMO).ġ.3.8, Certificate" means Mobile Offshore Drilling Unit Safety Certificate.ġ.3.9, 1974 SOLAS Convention" means the International Convention for the Safety of Life at Sea, 1974, as amended.ġ.3.10, "1966 Load Line Convention" means the International Convention on Load Lines, 1966.ġ.3.11, "Mode of operation" means a condition or manner in which a unit may operate or function while on location or in transit.