Section 2 Construction and installation
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Naval Ships, January 2023 - Volume 2 Machinery and Engineering Systems - Part 11 Support Systems - Chapter 4 Refrigeration System Arrangements - Section 2 Construction and installation

Section 2 Construction and installation

Parent topic: Chapter 4 Refrigeration System Arrangements

2.1 Materials

2.1.1 Materials used in the construction of the refrigerating equipment and associated systems are to be generally manufactured and tested in accordance with the requirements of the Rules for the Manufacture, Testing and Certification of Materials, July 2022.

2.1.2 Where it is proposed to use materials other than those specified in the Rules for the Manufacture, Testing and Certification of Materials, July 2022, details of the chemical compositions, heat treatment and mechanical properties are to be submitted for approval. In such cases the values of the mechanical properties used for deriving the allowable stress are to be subject to agreement with LR.

2.1.3 All materials used in refrigerating equipment and systems are to be suitable for use with the selected refrigerants. This includes joints, sealing materials and lubricants. For example, the following materials and refrigerants are not to be combined:

  • Copper with ammonia.
  • Magnesium with fluorinated hydrocarbons.
  • Zinc with ammonia or fluorinated hydrocarbons.

2.1.4 For ammonia systems, the condensers/evaporators are to be manufactured in titanium or a suitable grade of stainless steel.

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