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What is a Plimsoll Line?

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waybomb
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Vessel Info: 1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glaspar / 1969 Johnson Electrmatic 85
1964 Barron Flat bottom drag boat
A couple of dinghies
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What is a Plimsoll Line?

Postby waybomb » February 26th, 2013, 10:10 pm

http://oceanservice.noaa.gov/facts/plimsoll-line.html

A commercial ship is properly loaded when the ship’s waterline equals the ship’s Plimsoll line
Image

Plimsoll mark on the hull of a floating ship.

The Plimsoll line is a reference mark located on a ship’s hull that indicates the maximum depth to which the vessel may be safely immersed when loaded with cargo. This depth varies with a ship’s dimensions, type of cargo, time of year, and the water densities encountered in port and at sea. Once these factors have been accounted for, a ship’s captain can determine the appropriate Plimsoll line needed for the voyage (see above image):

TF = Tropical Fresh Water
T = Tropical
F = Fresh Water
S = Summer
W = Winter
WNA = Winter North Atlantic
AB = Letters indicating the registration authority (American Bureau of Shipping in the image shown; the circle with the line through it indicates whether or not the cargo is loaded evenly)

Samuel Plimsoll (1824–1898) was a member of the British Parliament who was concerned with the loss of ships and crews due to vessel overloading. In 1876, he persuaded Parliament to pass the Unseaworthy Ships Bill, which mandated marking a ship’s sides with a line that would disappear below the waterline if the ship was overloaded. The line, also known as the Plimsoll mark, is found midship on both the port and starboard hulls of cargo vessels and is still used worldwide by the shipping industry.
Thanks
Fred
1964 Barron Flatbottom with BBC Chevy
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572s
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alexander38
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1987 3607 aft cabin

Re: What is a Plimsoll Line?

Postby alexander38 » February 28th, 2013, 6:40 pm

Wow been along time since if seen one those, As Chief Hull Tech in the Navy I figured the ships draft underway every day.. :captain:

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