Self-elevating units
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - International Codes - 1989 MODU Code – Code for the Construction and Equipment of Mobile Offshore Drilling Units, 1989 – Resolution A.649(16) - Chapter 3 – Subdivision, Stability and Freeboard - 3.5 Extent of damage - Self-elevating units

Self-elevating units

  3.5.5 In assessing the damage stability of self-elevating units, the following extent of damage should be assumed to occur between effective watertight bulkheads:

  • .1 horizontal penetration: 1.5 m; and

  • .2 vertical extent: from the base line upwards without limit.

  3.5.6 The distance between effective watertight bulkheads or their nearest stepped portions which are positioned within the assumed extent of horizontal penetration should be not less than 3.0 m; where there is a lesser distance, one or more of the adjacent bulkheads should be disregarded.

  3.5.7 Where damage of a lesser extent than in 3.5.5 results in a more severe condition, such lesser extent should be assumed.

  3.5.8 Where a mat is fitted, the above extent of damage should be applied to both the platform and the mat but not simultaneously, unless deemed necessary by the Administration due to their close proximity to each other.

  3.5.9 All piping, ventilation systems, trunks, etc., within the extent of damage referred to in 3.5.5 should be assumed to be damaged. Positive means of closure should be provided at watertight boundaries to preclude the progressive flooding of other spaces which are intended to be intact.

Parent topic: 3.5 Extent of damage
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