Section 5 Internal atmosphere pressure
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 2 Transverse Criteria - Section 5 Internal atmosphere pressure

Section 5 Internal atmosphere pressure

Parent topic: Chapter 2 Transverse Criteria

5.1 Functional objective

5.1.1 The internal submarine, systems, equipment and components shall be able to operate when exposed to the range of internal atmosphere pressures which can be experienced on a submarine for all foreseeable operating conditions.

5.2 Performance requirements

5.2.1 The maximum and minimum static and transient internal atmosphere pressure shall be defined for normal and abnormal operating conditions. Pressure limits are to be set taking into account internal air temperature variation.

5.2.2 Pressure limits are to be set giving due consideration to all sources of pressure or depression which vent internally or draw atmosphere from within the submarine, e.g. tank filling, venting, compressors, engines, batteries, gas powered launch systems, air induction systems.

5.2.3 The maximum and minimum transient internal atmosphere pressure shall be defined for emergency operating conditions. The following accident scenarios shall be considered: unintended munition reaction, stored gas leakage, piping system leakage, operation of fixed firefighting systems, flooding incident, flood control through pressurisation, unintended operation of machinery which consumes internal atmosphere, failure of air induction system safeguards.

5.2.4 The static and transient air pressures defined shall take account of immediate capability and longer-term health of the embarked persons.

5.2.5 The systems, equipment and components are to be verified as being effective and safe for the full range of internal atmosphere pressures.

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