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This bulletin explains the options available to the owner of an existing small non-pleasure vessel for assessing the stability of that vessel. Guidance for Assessing Intact Stability and Buoyancy of Existing Small Non-pleasure Vessels Introduction The ability of a vessel to remain floating and upright in all conditions of loading and operation, in all reasonably expectable wave and weather conditions, is fundamental to a safe voyage. Intact stability, buoyancy and watertight integrity requirements for new vessels those whose construction started on or after April 1, came into effect on February 1,
This bulletin explains the options available to the owner of an existing small non-pleasure vessel for assessing the stability of that vessel. Guidance for Assessing Intact Stability and Buoyancy of Existing Small Non-pleasure Vessels Introduction The ability of a vessel to remain floating and upright in all conditions of loading and operation, in all reasonably expectable wave and weather conditions, is fundamental to a safe voyage.
Intact stability, buoyancy and watertight integrity requirements for new vessels those whose construction started on or after April 1, came into effect on February 1, For existing vessels more than 6 metres long and not more than 15 gross tons that do not need annual inspections, there are no specific stability requirements other than the Canada Shipping Act requirement that owners and masters use all reasonable means to ensure vessels are seaworthy S This bulletin outlines acceptable stability criteria in order to provide a consistent basis for assessing whether existing vessels have adequate stability.
Application Criteria This bulletin applies to existing non-pleasure vessels: Vessels 6 metres or less in length built on or after April 1, must remain afloat if swamped Construction Standards for Small Vessels — TP , Sections 4. Purpose The bulletin explains the options available to the owner for verifying the stability of an existing non-pleasure vessel to a recognized standard. Incidents involving loss of stability are those most likely to lead to fatalities. Transport Canada is providing this guidance in order that owners can evaluate the stability of their vessels.
Compliance with any of the standards set out in this bulletin does not guarantee a vessel will not capsize or sink and does not take away the primary responsibility for the day-to-day safety of a vessel, passengers and crew which lies with the Master.
Only the Master of a vessel can determine when it is safe to sail and how to respond safely to various operating conditions. Assessment of Stability The annex that follows outlines options available for assessing the stability of an existing non-pleasure vessel. More Information If required, please contact the nearest Transport Canada Centre or a marine consultant for more information. Guidance for Stability Assessment of Existing Small Non-Pleasure Vessels Part 1 Choice of Standard A prudent operator will want to be sure that a vessel has sufficient stability for the intended operation.
This can be done by demonstrating the vessel meets the criteria of one of the international or Canadian standards listed in this part. Instructions for carrying out assessments are given in the applicable standard or, for the simplified assessment described in Part 2 of this Annex, in the Transport Canada Guide to the Simplified Assessment of Intact Stability and Buoyancy of Small Non-pleasure Vessels the Guide.
The Guide can be viewed, downloaded or ordered from the Transport Canada website http: If a vessel has been satisfactorily assessed to one of these standards and has not been modified since the assessment was carried out, no additional assessment need be done. If no such assessment has been carried out, or if the vessel has been modified since the assessment was carried out, Transport Canada recommends that an assessment be carried out.
The vessel owner may choose the standard against which the vessel will be assessed. Three such standards follow. Options for Vessels that do not Meet the Standard Where a vessel does not fully comply with the requirements of the selected standard, the owner may choose to alter the vessel so that it does meet the standard, assess against another standard – the ISO standard is recommended as it has several categories of compliance – or, consider the options presented in the Guidelines for vessels that do not meet the standard in Part 5 of this Annex.
Contact your local Transport Canada Centre or a marine consultant if you need more information regarding an assessment of the stability of your vessel. Simplified Assessment of Intact Stability and Buoyancy of Small Non-Pleasure Vessels Purpose Ensuring that a vessel has adequate stability, buoyancy and watertight integrity is necessary to protect passengers and crew. The Simplified Assessment provides an indication that a vessel has adequate stability using a limited number of measurements and a very simple series of steps.
Application These instructions and the Guide are provided to help an owner understand the criteria applied, and the process followed, in assessing an existing small non-pleasure vessel: Refer to Part 3 of this Annex for examples of downflooding height measurements. Preparation Before starting the assessment, check that the required equipment is at hand and that the test conditions are met.
Measuring tape; Optional equipment for measuring the angle of heel: Weights may consist of: As a last resort, people may be used if life jackets are worn and testing is carried out with caution; Garden hose, with jet nozzle, capable of a continuous flow of a least 10 litres per minute; and Scale to verify weights if not determinable by other means.
Test conditions: A vessel is fully decked if: At a minimum, two freeing ports one port and one starboard may be accepted each having a clear area of at least cm2 — the ports may be fitted in the transom on vessels where the shipping of water will not result in a trim by the head, preventing the deck from draining.
Part 3 Downflooding Height Measurement – Examples Downflooding height – the lowest height measured from the waterline to an opening, e. Examples of the measurement of this height on differently configured vessels are provided below for guidance.
VIDEO: Bulletin No.: 07/ – Transport Canada
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