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KS-0179-1E Procedure for Inclining Test and Determination of Lightship

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KS-0179-1E Procedure for Inclining Test and Determination of Lightship Procedures for determination of light ship displacement and centre of gravity of Norwegian ships KS-0179-1E OTI Rev.: 07.01.2020 Page 1 of 15 Norwegian Maritime Authority Procedures for determination of light ship displacement and centre of gravity of Norwegian ships Contents: 1. INTRODUCTION .......................................................................................................................................................... 3 2. RESPONSIBILITIES ...................................................................................................................................................... 4 3. PREPARATIONS FOR THE LIGHTSHIP SURVEY ................................................................................................... 5 3.1 Notification of the Administration ............................................................................................................................ 5 3.2 General condition of the ship .................................................................................................................................... 5 3.3 Tanks ......................................................................................................................................................................... 6 3.4 Draught measurements .............................................................................................................................................. 6 3.5 Additional requirements for inclining tests: .............................................................................................................. 7 3.6 Plans required .......................................................................................................................................................... 10 4. CONDUCTING AN INCLINING TEST .................................................................................................................... 11 4.1 Requirements .......................................................................................................................................................... 11 4.2 Interpretation of plotted readings ............................................................................................................................ 12 4.3 Special considerations if a U-tube is used ............................................................................................................... 13 5 IMPLEMENTATION OF PRACTICAL INCLINING TEST ....................................................................................... 14 5.1 Information to be forwarded in advance of the Practical Inclining test: ................................................................. 14 5.2 Procedure for Practical Inclining Test ..................................................................................................................... 14 5.3 Acceptance criteria: ................................................................................................................................................. 15 5.4 Reporting after practical inclining test .................................................................................................................... 15 KS-0179-1E OTI Rev.: 07.01.2020 Page 2 of 15 Norwegian Maritime Authority Procedures for determination of light ship displacement and centre of gravity of Norwegian ships 1. INTRODUCTION According to Norwegian regulations concerning the construction of Norwegian passenger ships, cargo ships and barges, as well as for fishing vessels, the following principles for determination and approval of light ship displacement and position of the centre of gravity applies: • The execution shall be based on procedures laid down by the Norwegian Maritime Authority (NMA), and the results shall be written in a prescribed format. • The calculations of the light ship data shall be approved by the NMA, before the ship goes into service. • If the design of the ship is such that there is reason to assume that an inclining test carried out in accordance with normal procedures will not provide reliable light ship data, the NMA shall be contacted. The purpose of the following guidelines is to ensure the accuracy of the light ship weight and centre of gravity, and constitutes the procedures referred to above. This document is based on Chapter 8 of International Code on Intact Stability, 2008 (IS-code). Although that text was primarily written for large ships, these inclining test procedures are adaptable for ships with a length below 24 m if special precautions are taken to ensure the accuracy of the test. The Code also contains an annex with more detailed practical guidance for conducting an inclining test. Although not considered an integral part of these standard procedures, the NMA recommends that the contents of that annex are studied as additional guidance in connection with the planning of lightweight surveys and inclining tests. While compliance with the procedures outlined herein will facilitate an expeditious and accurate lightweight survey and inclining test, it is recognized that alternative procedures or arrangements may be equally efficient, and may in some cases be necessary. However, to minimize risk of delay, all significant deviations from these guidelines must be submitted to the NMA for consideration in reasonable time prior to the execution. Such submissions must be accompanied by proposals for measures to be taken in order to achieve an equal level of accuracy. The ship's classification society has a general authorisation to act on behalf of the Norwegian Maritime Authority (NMA), with respect to: • Cargo ships of 500 gross tonnage and upwards, registered in NOR, upon request of the ship owner. • Cargo ships of 500 gross tonnage and upwards, classed by RO, registered in NIS. • Passenger ships classed by RO and registered in NIS. KS-0179-1E OTI Rev.: 07.01.2020 Page 3 of 15 Norwegian Maritime Authority Procedures for determination of light ship displacement and centre of gravity of Norwegian ships 2. RESPONSIBILITIES The responsibility for initiating lightweight surveys and inclining tests rests with the owner/yard for ships being built, modified and periodical lightweight surveys and inclining tests. A qualified person shall be in charge of making preparations, conducting the test. This person may be a representative of the yard or the owners or a naval architect acting on their behalf. The responsibilities of this person are: • Ascertaining that all necessary preparations have been made prior to the arrival of the attending surveyor. • Administrate and coordinate the execution of the lightweight survey and inclining test. • Gather complete results from all measurements as soon as these are available. • Plot accumulated pendulum swings and heeling moment after each move, so that errors can be quickly detected. • Plot draft readings. • Prepare results as expediently as possible in order to expose mistakes and inaccuracies at an early stage. • Submit the final lightweight survey or inclining test report to the surveyor for approval in reasonable time before the planned departure of the ship. The surveyor present shall: • Attend the survey and note all information relevant for the approval of the final report • Approve the report, if the conduct and the results are acceptable. The surveyor may reserve the right to present the report to the Administration for further evaluation if in doubt. In the case of a surveyor appointed on behalf of the NMA (excluding ship's where the classification society has a general authorisation to act on behalf of the Norwegian Maritime Authority (NMA)), the surveyor shall: • Verify that the contents of the report coincides with his own notes and that these procedures were adhered to • Submit the report to the NMA ([email protected]) for approval KS-0179-1E OTI Rev.: 07.01.2020 Page 4 of 15 Norwegian Maritime Authority Procedures for determination of light ship displacement and centre of gravity of Norwegian ships 3. PREPARATIONS FOR THE LIGHTSHIP SURVEY 3.1 Notification of the Administration An Administration representative must be present to witness the lightweight survey and the results shall be submitted to the attending surveyor [email protected] for approval. Written notification of the survey should be sent to the Administration in due time before execution. Details of notification Written notification should provide the following information: • identification of the ship by name, callsign and/or shipyard hull number; • date, time, and location of the survey; • inclining weight data, if an inclining test is to be performed : • type of weights; • amount (number of units and weight of each); • certification of mass; • method of handling (i.e. sliding rail or crane); • mass and location of righting- and/or trimming weights • anticipated maximum angle of heel to each side; • approximate location and length of pendulums • If a substitution of a pendulum with an inclinometer or other device is desired, details on such solutions. • approximate trim; • condition of tanks; • estimated weights to deduct, to complete, and to relocate in order to place the ship in its true lightship condition; • description of computer software to be used to aid in calculations during the survey; • name and phone number of the person responsible for conducting the survey. 3.2 General condition of the ship The ship should be as complete as possible at the time of the lightweight survey, but some flexibility will be acceptable in order to minimize the disruption
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