Acronym NA
Category
Fisheries
Title Stabilitet og stabilitetsmarginer for mindre fiskefartøy - Stability and stability margins for smaller fishing vessels Programme National Programme
Instrument (FP6)
Contact Type (FP7)
Strand (Interreg)
NA
Theme (FP7)
Activity Area (FP6)
Regional Area (Interreg)
Action (COST)
NA
Specific Programme (FP7)
NA
Funding source National Coordinator Halvard L. Aasjord Coordinator email halvard.aasjord@sintef.no
Coordinator institution
NA
Institutions involved
NA - Polarkonsult AS (Norway) ,
Start year 2012 End year 2013 Funding (€) € 124,185 Website https://www.fhf.no/prosjekter/prosjektbasen/900817/ Summary Severe shipwrecks and accidents in small coastal fleets below 15 m longest length in the years 1970–2012 have been systematically reviewed and distributed among vessel groups and accidents. During this period, various accident commissions have carried out about 60 investigations of serious shipwrecks / accidents in the smallest fishing fleet, and these reports are included in the basis for the causal analyzes. Of a total of 169 shipwreck incidents, 108 accidents have been registered which have resulted in loss of vessel stability and consequent capsizing and / or sinking. Overturning shipwrecks and water fills have been a significant safety problem for many years, especially for the 20-34-foot vessel group. The same applies to leakage and groundings that have resulted in the loss of many fishing lives. The following can be summarized: a) Inadequate vessel technical and safety standards have been a major contributor to many of the serious shipwrecks; b) lack of knowledge about vessel stability and how this is affected by changed cargo and changes on board is also a contributing factor; c) upgrading on the equipment side and subsequent incorrect operation have contributed to many serious shipwrecks such as water fills and caps. A periodic vessel inspection will probably be able to reveal whether the sailing vessels have safety deficiencies, especially with regard to seaworthiness and vessel stability in relation to the mode of operation and actual cargo weights on board. An overview of the coastal fishing fleet under 15 meters has been obtained based on county-specific vessel data in the Norwegian Directorate of Fisheries. In total, there were 5,639 vessels in this entire group of vessels. 3456 active fishing vessels have been registered in the group 8.0–11 meters. The vessels 8.0–11 meters are further divided into five different age groups, 1900–69, 1970–79, 1980–89, 1990–99, 2000–2012, as well as the number of vessels built before / after 1992. The result was 2645 vessels (77 %) with year of construction before 1992 and 811 vessels (23%) with year of construction 1992 and newer. How many of these 811 vessels have stability documentation has proved difficult to answer, as there is no comprehensive register of all stability-controlled fishing vessels under 15 meters. There are approximately 3400 vessels that will be covered by a requirement for full stability control of all vessels between 8.0–10.67 meters. The Nordic Boat Standard forms the basis for the stability requirements that the approved companies use for smaller fishing vessels. The costs for performing heeling tests, surveying of vessels and stability analyzes for smaller fishing vessels will, depending on the scope, be in the range of NOK 20,000–50,000 ex. VAT. The cost for measuring a ship's hull with a 3D laser scan will be around NOK 35,000 excluding heeling test. A survey of operational conditions has been carried out and an estimate has been made for lightweight, equipment and gear weights that are typical of different vessel types and modes of operation in a small coastal fishing fleet of less than 15 m. more specifically, more extensive work must be done to map and weigh all types of equipment that are in use and what quantities of gear are practiced in relation to different types of fishing and modes of operation in the different seasons. Three methods for simplified stability control are presented. Method 1 : Self-rolling method: Measure the vessel's self-rolling period, T (sec.) (At the quay) and then use a simple formula to determine the metacenter height, GM (meters); method 2 : the pendulum method: The vessel is suspended as a "physical pendulum" to determine the center of gravity, KG and check this against KG max for the vessel type; method 3: heeling method for open boat: Simplified heeling method discussed in Nordic Boat Standard chapter Y3 for determining the stability of open vessels (not closed deck). This method is based on the GZ value for a given heeling angle can be calculated when the vessel's displacement (∆) and the magnitude of the heeling moment (MK) are known. A modification of this method is also described (3b). Here it is proposed to use a heeling rope attached to a fixed point or large weight on the bottom instead of a free-hanging weight. With regard to stability conditions and cargo conditions, smaller fishing vessels should also have a safety documentation that includes stability calculations with real cargo conditions in relation to one or more modes of operation. Simplified test methods should be able to be used on older vessels fishing with lighter gear types. Boat builders should submit safety documentation including stability documentation for new boat concepts that will later be approved as fishing boats for defined modes of operation or combinations. It should also set clearer competence requirements for the skipper / master of the ship how to handle his vessel, fishing gear and fishing cargo in order to meet the stability margins at different cargo conditions. The Directorate of Fisheries and the Norwegian Maritime Directorate are recommended to coordinate the approval of certain popular boat types such as fishing boats (professional boats), where e.g. includes restrictions on permitted mode of operation and number of tools.
Keywords
Engineering;
Fishing technology;
Vessel technology;
Fishing vessels;
Marine Region
13
Northern North Sea (27.IVa)
41
Norwegian Sea (27.IIa)
14
Skagerrak, Kattegat (27.IIIa)
42
Barents Sea (27.I)
4
Marine Region Map
