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Session VI Buoys Day boards

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Session VI Buoys Day boards. Buoys and Appendages. Lantern. Lantern Guard Ring. Radar Reflectors. Tower Braces. Tower Legs. Battery Pockets. Lifting Padeye. Buoy Top Head. Buoy Body. Bottom Head. Mooring Padeye. Gussets. Chafe Block. Buoy Tube. Counterweight.

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Presentation Transcript
slide3

Lantern

Lantern Guard

Ring

Radar

Reflectors

Tower Braces

Tower Legs

Battery Pockets

Lifting

Padeye

Buoy Top Head

Buoy Body

Bottom Head

Mooring Padeye

Gussets

Chafe Block

Buoy Tube

Counterweight

Counterweight Seat

sound systems
Sound Systems
  • There are three main types of wave actuated sound signals:

Whistle

Bell

Gong

whistle
Whistle
  • Whistle is made of cast bronze and is mounted inside the cage.
  • As air is forced through the whistle it makes the familiar drone sound.
bells
Bells
  • Bells used on lighted and unlighted buoys and are made of a copper-silicon alloy.
  • External tappers impact the fixed bell when wave motion causes the buoy to roll.
gongs
Gongs
  • Gongs are used on lighted and unlighted buoys and are made of a copper-silicon alloy.
  • External tappers impact the fixed gongs when then buoy rolls.
  • The gongs emit a different tone when struck thus distinguishing them from a bell.
buoy moorings
Buoy Moorings
  • Buoy chain connects the buoy to the sinker.
  • The bridle distributes the load and minimizes the heel angle caused by the chain.
slide10

Watch Circle Radius

  • Buoys will move with the current and weather
  • The sinker is really in the actual position
sinkers
Sinkers
  • Sinkers are used to hold buoys in position. There are two types that we use.
    • Concrete
    • Dor-mor
sinkers1
Sinkers

Concrete- These are cheap, easy to make and easy to retrieve for an inspection.

  • When made, they must be cast in a single pour.
  • They range in size from 250 to 20,000 lbs.
  • If chain or other metal is added, they must be marked with their actual weight.
sinkers2
Sinkers

DOR MOR Sinker

  • A cast iron, pyramid shaped sinker intended for use on discrepancy buoys in areas of mud or sandy bottoms.
lighthouse
Lighthouse
  • Enclosed edifice that houses protects, displays, or supports visual, audible, or radio aids to navigation.
    • Unmanned (except Boston Light)
    • Located in an offshore, wave swept, exposed environment - or as a landfall object.
single pile structure

2

Single Pile Structure
  • Used in protected or semi-exposed locations
dolphin

1

Dolphin
  • Battered pile

Three to seven piles driven at an angle with the bottoms spread and the tops secured with wire rope or bolts and shear connectors.

dolphin1
Dolphin
  • Cluster pile
    • Three or more piles driven vertically with their surfaces in contact with each other and wrapped tightly at various heights.
platform structure
Platform Structure
  • Three or more separate piles driven vertically, connected at the top by a platform that spreads the load over all the piles. Usually is the foundation for skeleton towers.
guyed skeleton
Guyed Skeleton
  • Commonly called a “TV tower.”
  • Triangular in shape.
  • Galvanized 1 1/4” steel pipe and 3/16” guide wires.
  • Each section is 10 ft. in height.
  • Usually not built over 30 ft.
free standing skeleton tower
Free Standing Skeleton Tower
  • Commonly called “5 ft pipe towers”.
  • Constructed of galvanized metal.
  • Can be uniform or tapered.
  • Usually, not built over 100 ft. in height.
radar reflector

CHANNEL

Radar Reflector
  • Installed when the reflectivity of the structure doesn’t meet the operational requirements.
  • A standard radar set should detect it at 1.5 to 2 NM when mounted 10 ft above the water.
  • Must be properly oriented to the channel.
dayboards

S-Square

T-Triangle

J-Junction

M-Mid-Channel

K-Range

N-No Lateral Significance

Dayboards
  • The first letter refers to the shape or purpose of the dayboard.
mounting

o

5

Mounting

Dayboard may be installed approximately 5 degrees from vertical.

mounting1

o

3 0

CHANNEL

Mounting
  • Whenever possible, dayboards shall be mounted on an angle to the channel.
  • The angle will vary to best suit the channel.
  • For a straight channel about 30 degrees.
  • This makes the number easier to read when abeam.
slide25

Reflective Material

Smooth appearance

Honeycomb appearance

Bothmaterials may be used together on the same aid.

dayboards1
Dayboards
  • Additional information is shown by letters placed after a dash (-)
  • I - Intracoastal
  • SY - yellow square
  • TY - yellow triangle
nominal range
Nominal Range
  • As a mariner approaches a dayboard from a distance it is first detected as an object apart from its surroundings.

This is the detection range

nominal range1
Nominal Range
  • Upon coming closer to the dayboard it can be recognized as an aid to navigation.

This is the recognition range

nominal range2
Nominal Range
  • Finally the aid can be identified when the mariner is close enough to read the numbers and letters.

This is the identification range

nominal range3

3SG and 4TR

    • nominal range 1NM
  • 4SG and 6TR
    • nominal range 2NM
  • 6SG and 8TR
    • nominal range 3NM
Nominal Range
  • The nominal range rating is used to classify dayboards
dayboards2

4’

3’

3’

4’

Dayboards
  • There is no character for height in the designation.
  • All dayboards including TRs and SGs are as tall as they are wide.
range dayboards

2W

W

Range dayboards
  • Range boards are always twice as tall as they are wide.
range dayboards1
Range Dayboards

KWB

KGW

KWG

KBW

KWR

KRW

KBG

KRB

KBR

KRG

KGB

KGR

information and regulatory markers
Information and Regulatory Markers

Exclusion

Area

Controlled

Area

Danger

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