Section 5 External blast
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Submarine Assurance Framework, July 2022 - Volume 1 Submarine Assurance - Part 4 Whole Boat Requirements - Chapter 8 Survivability - Section 5 External blast

Section 5 External blast

Parent topic: Chapter 8 Survivability

5.1 Functional objectives

5.1.1 The submarine structure, systems and equipment are to be designed to withstand the effects of a defined external blast at a specified distance from the submarine. Measures are to be taken to reduce the risk of injury to embarked persons.

5.1.2 As a minimum, the external blast policy will provide sufficient protection to essential structure, systems and personnel in the event of a defined external blast event, which shall:

  1. Ensure that exposed structure remains effective and capable of protecting submarine functions and personnel;
  2. Ensure that essential load-bearing structure remains effective and capable of supporting load;
  3. Ensure that fittings and closures remain effective and capable of operating in an emergency situation; and
  4. Ensure that embarked persons are not at an increased risk of injury.

5.2 Performance requirements

5.2.1 An external blast system operating concept shall be developed, to define the magnitude and nature of the blast event, pressure and duration. It shall identify the compartments, systems and equipment to be protected and the expected performance during and after the blast event.

5.2.2 Structures protecting external above water compartments containing essential systems or personnel shall be capable of withstanding a specified blast event without collapse or deformation that would prevent operation.

5.2.3 Load-bearing external structures shall be capable of withstanding a specified blast event without an appreciable reduction in their ability to carry load.

5.2.4 Essential fittings and closures shall be capable of withstanding a specified blast event and its effects without a loss in functionality or integrity of the system or boundary into which they are fitted.

5.2.5 Failure of a fitting or closure due to a specified blast event shall not present an increased danger to essential systems or personnel on board either by its inability to operate or its failure.

5.2.6 Where required, the structure, fittings and closures shall preserve the integrity level specified for the maintenance of the CBRN defence boundaries following a specified blast event.

5.2.7 Where required, the structure providing protection to embarked persons shall be capable of withstanding the defined threat.

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