Section 2 LR engagement
Clasification Society 2024 - Version 9.40
Clasifications Register Guidance Information - Guidance Notes For Flettner Rotor Approval, May 2015 - Chapter 1 Guidance Notes For Flettner Rotor Approval, May 2015 - Section 2 LR engagement

Section 2 LR engagement

Parent topic: Chapter 1 Guidance Notes For Flettner Rotor Approval, May 2015

2.1 Objectives of Approval for Flettner Rotors

2.1.1 The following safety objectives are considered during the classification approval process:

  • to ensure that the rotors will have no adverse effect on the safe operation of the ship either during normal operation or in the event of a rotor failure
  • to ensure that the rotors will cause no harm to the ship’s occupants either during normal operation or in the event of a rotor failure

2.2 Scope of Approval

2.2.1 Lloyd’s Register’s (hereinafter referred to as LR) approach to the Classification of Flettner rotors is based on the understanding that the rotors themselves are not essential for the safe operation of the ship, i.e., sufficient propulsion power is provided by a conventional power generating plant. However, if they are to be installed on an LR classed ship, LR needs to be satisfied that they would not adversely affect the safe operation of the ship or the safety of its crew either during normal operation of the rotors or following failure.

2.2.2 As a result, there will be safety considerations associated with the installation, both during normal operation, e.g., under certain conditions they may obstruct the view from the navigating bridge, or in the event of failure when they may injure the ship’s occupants or damage the ship’s structure or other essential systems on board the ship. LR therefore requires that the risks to the ship’s occupants and to the safe operation of the ship need to be assessed through a structured risk assessment study which is to be reviewed and accepted by LR.

2.2.3 In addition to a risk assessment, LR requires the interfaces between the rotors and the ship to be reviewed and accepted by LR, including the connection to the deck and below deck structure, the electrical supply and control circuits and any mechanical connections such as hydraulic circuits.

2.3 Notes on Classification

2.3.1 There are currently no specific LR Rules in place for the use of Flettner rotor technology on board ships. Thus, the approval process of the Flettner rotors is based on the following existing Rules, as applicable:

2.3.2 The following Sections of the Guidance Notes outline the approval process of the Flettner rotors. There are three main steps of the approval process (see Figure 1.2.1 Pictorial representation of main steps of the approval process). They are as follows:

Step 1: Rotor Survey & Approval

Step 2: Foundation Structure Survey & Approval

Step 3: Integration Survey & Approval

Figure 1.2.1 Pictorial representation of main steps of the approval process

Note The procedure or submissions required to carry out Design Appraisal may vary from project to project. LR reserves the right to request additional design information, calculations and plans at any time during the design approval or construction phase of the vessels, to assist in the Design Approval Process.

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