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M400: Collision [Table of Contents] M600: Unintended flooding

DNV-OS-C201 Structural Design of Offshore Units (WSD method)

[-] Sec.14: Special Considerations for Deep Draught Floaters (DDF)
[-] M: Accidental Condition
[-] M500: Dropped objects

Sec.14
M 500   Dropped objects

Sec.14 M
501   Critical areas for dropped objects shall be determined on the basis of the actual movement of potential dropped objects (e.g. crane actions) relative to the structure of the unit itself. Where a dropped object is a relevant accidental event, the impact energy shall be established and the structural consequences of the impact assessed.

Sec.14 M
502   Generally, dropped object assessment will involve the following considerations:
  1. Assessment of the risk and consequences of dropped objects impacting topside, wellhead, and riser system in moonpool and safety systems and equipment. The assessment shall identify the necessity of any local structural reinforcement or protections to such arrangements.
  2. Assessments of the risk and consequences of dropped objects impacting externally on the hull structure (shell, or bracings) and hull attachments such as strakes, fairleads and pipes. The structural consequences are normally fully accounted for by the requirements for watertight compartmentation and damage stability and the requirement for structural redundancy of slender structural members.
M400: Collision [Table of Contents] M600: Unintended flooding