Section 4 Shock and whipping
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 4 Shock and whipping

Section 4 Shock and whipping

Parent topic: Chapter 8 Survivability

4.1 Functional objectives

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

4.1.2 The policy shall address the effects on the submarines systems of an initial shock wave resulting from a single underwater explosion that is sufficiently distant to exclude jet formation and contact effects.

4.1.3 Whipping effects after the initial shock pulse are also to be considered.

4.2 Shock event performance requirements

4.2.1 A shock system operating concept shall be developed to describe the magnitude and nature of the shock event. It shall identify the compartments, systems and equipment to be protected and the expected performance during and after the shock event.

4.2.2 The shock event shall be assessed to determine the likelihood of whipping of the submarine. Where appropriate, the whipping effects on equipment are to be considered.

4.3 Pressure hull performance requirements

4.3.1 The impact of the shock event on relevant elements of the submarine structure shall be determined by testing or analysis to define the shock loading environment for the equipment and systems.

4.3.2 The watertight integrity of the submarine structure, penetrations, defined internal pressure boundaries and internal tank boundaries shall not be compromised by the defined shock event.

4.3.3 The integrity of the submarine pressure hull structure shall not be compromised by the whipping effects from the defined shock event.

4.3.4 The Naval Administration may define additional integrity requirements for external structure, appendages, propulsion equipment, and control systems essential to the operation of the submarine.

4.4 Equipment and systems performance requirements

4.4.1 Equipment, components and their supporting structure shall remain captive in defined compartments.

4.4.2 The systems defined by the Naval Administration are to remain capable of a defined level of operation following a defined shock event.

4.5 People performance requirements

4.5.1 The embarked persons are to be protected from the direct effects of the defined shock event.

4.5.2  Procedures and training are to be established to enable embarked persons to prepare for the defined shock event.

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