Definition(s)

Mode of Operation

Mode of operation means the condition or manner in which a MOU may operate or function while on location or in transit. The modes of operation of a MOU include the following:

  1. Operating conditions: conditions wherein a MOU is on location for the purpose of conducting operations, including drilling and production activities, and wherein combined environmental and operational loadings are within the appropriate design limits established for such operations. The MOU may be either afloat or supported on the seabed, as applicable.
  2. Survival conditions: conditions wherein a MOU may be subjected to environmental loadings in excess of those established by the MOU’s operating manual. It is assumed that routine operations will have been discontinued due to the severity of the environmental loading. The MOU may be either afloat or supported on the seabed, as applicable.
  3. Transit conditions: conditions wherein a MOU is moving from one geographical location to another.
  4. Combined operations: operations in association with, or in close proximity to, another mobile offshore MOU or offshore installation, where conditions on the other MOU or installation may have an immediate impact on the safety of the MOU; for example, a mobile offshore drilling MOU attached to a fixed platform.

Source: IMO Resolution A.1079(28), Recommendations for the Training and Certification of Personnel on Mobile Offshore Units (MOUs), Adopted on 4 December 2013, International Maritime Organization, Regulatory Guidance

Mode of Operation

Mode of operation means a condition or manner in which a unit may operate or function while on location or in transit. The modes of operation of a unit include the following:

  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 seabed, 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. The unit may be either afloat or supported on the seabed, as applicable.
  3. Transit conditions – conditions wherein a unit is moving from one geographical location to another.

Source: IMO Resolution A.1023(26), Code for the Construction and Equipment of Mobile Offshore Drilling Units (2009 MODU Code), 2009. Global Standards

Source: IMO resolution MSC.267(85), International Code on Intact Stability, 2008 (2008 IS Code), 4 December 2008, International Maritime Organization. Regulatory Guidance

Source: IMO Resolution MSC.267(85), adoption of the International Code on Intact Stability, 2008 (2008 IS Code), 4 December 2008, International Maritime Organization. Regulatory Guidance

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