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The basic concept of load lines on a ship?

load line

The basic concept of load lines

  1. Load Line  ensure that she cannot be loaded beyond her strength
  2. Load Line provide adequate reserve buoyancy
  3. Load Line protects the crew.

Conditions of Assignment

  1. Hull must be adequate structural strength
  2. Hull must be water-tight
  3. Hull must be adequate freeing arrangements
  4. the ship must have adequate stability
  5. the ship must have adequate motive power.

Assignment of Load lines

  • Conditions of assignment survey
  • Deck line fixed
  • Freeboard computation
  • Assignment of FB/LL
  • LL marking on ship sides
  • Final survey
  • Issued LL Cert.

Ships excepted from Load line Convention’s provisions

  1. ships of war
  2. ships of under 24 m length
  3. ships under 150 GT
  4. pleasure yachts not engaged in trade
  5. fishing vessels

Ships exempted from Load line Convention’s provisions

  1. Ship normally trading domestic voyages
  2. One-off international voyage
  3. Ship of novel features.

LOAD LINE LAW

Requirements before proceeding to sea

Ship may not proceed or attempt to proceed to sea unless:

(1) Surveyed in accordance with the Regulations

(2) Marked with the appropriate marks

(3) Complies with Conditions of Assignment.

  • Information regarding stability, loading and ballasting is provided for the master’s guidance.
  • Ship may not be so loaded that the appropriate load line on each side of the ship would be submerged if the ship were in salt water and had no list.

According to SOLAS II-1/Reg 18/Amd-05

    • Used for Passenger Ship.
    • Requested by the Owner to Administration to additional LL assigned.
    • Assigned and mark in PSSC.
    • Not survey with LL survey.
    • P1, P2, P3 Notification for passenger service configuration R Highest value

Deck Line

(1)Horizontal line at amidships

(2)300mm(L) X 25mm(B)

(3)Intersect the upper surface of F/B deck.

LOAD LINE SURVEYS

(As per LL Convention Art.14)

Initial survey

    • Complete inspection of SEMAS (structure, equipment, arrangements, materials and scantling)
    • Ensure fully comply with relevant regulations.
    • Complete and through examination as follow:
    1. Ship’s structure (Internally/Externally)
    2. All fitting (protection of opening, guard rails, freeing ports and means of access)
    3. Stability, loading and ballasting information
    4. Test necessary by surveyor

Renewal survey

Inspection of SEMAS, to ensure with requirement of regulations.

Annual survey (formerly called periodical inspections)

    • Ensure that no alteration made to hull (or) structures affecting LL position and all fittings.
    • Details items follows
    • Hatchway
    • Opening in ship side (below F/B deck)
    • Machinery casing and deck houses
    • Freeing ports
    • Ventilator and Air pipe
    • Position of LL/DL
    • Any departures from Conditions of assignment
    • Special fitting/marking for timber ship

PSC Inspection

As per LL Con. Art.21

    • Validity of Certificate
    • Not loaded beyond the limits, by Cert.
    • Position of LL, by Cert.
    • Any alteration of materials.

PSC Detain

    • Absence of LL Certificate/ endorsement
    • Absence of information regarding for stability, cargo and ballast operation
    • Insufficient stability
    • Overloading
    • Impossible to read LL/ draft marking
    • Defect of freeing arrangement/closing devices/crew protections

Cancellation of certificate

    1. the ship does not comply with the Conditions of Assignment;
    2. the structural strength of the ship is lowered to such an extent that she is unsafe;
    3. the information on which the freeboards were assigned was incorrect;
    4. the ship has not been periodically inspected;
    5. the new certificate is issued; and
    6. the ship ceased to be registered.

Information on LL Certificates

    1. Ship name, ON / POR
    2. Type of ship
    3. Position of LL/DL/FB
    4. Diagram of LL
    5. Date of initial survey/ annual survey
    6. Date of place of issue
    7. Certifying authority
    8. Signature of person issuing.

Definitions

Winter North Atlantic load line

    • ships of 100 m or less in length
    • either in the North Atlantic Winter Seasonal Zones (I or II) during winter seasonal periods.

Type ‘A’ ship

    • Designed to carry only liquid cargoes in bulk;
    • such a ship will have:
    1. high integrity of the exposed deck and
    2. high degree of safety against flooding.

Type ‘B’ ship

  • any ship which is not a type ‘A’ ship.

Freeboard deck

  • is the uppermost complete deck having permanent means of closing all openings in weather section.

Weather deck

  • is the uppermost complete deck exposed to weather in any sea condition above and at least two sides;

Watertight

  • means capable of preventing the passage of water in any direction.

Weathertight

  • means that in any sea condition, water will not penetrate into the ship.

Enclosed superstructure

  • if the first tier of superstructure is watertight, it is called an enclosed superstructure.

Statutory freeboard

  • the distance from the upper edge of deck line to the centre of the load line disc.
    • Stability booklet
    • Structural strength sufficient
    • Deck/Hull …… not corroded/not cracked
    • Watertight …. Cargo port / Opening (below FB DK)
    • Weather tight …. Hatchway/coaming ,Machinery space opening, opening @ weather dk.
    • Good condition .. Ventilator,Bulkwalk, railing ,Pumping arrangement
    • Operational …… Non return valve ,Port holes, funnel flaps, skylight doors
    • issued to ships which have been surveyed and marked in accordance with the Load Line Regulations;
    • issued by the ship’s authorized classification society;
    • for an un classed ship, it will be issued by the Administration;
    • period of validity is 5 years subject to passing periodical inspections;
    • Record of Particulars Relating to the Conditions of Assignment” is issued with a Load Line Certificate.
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2 thoughts on “The basic concept of load lines on a ship?

  1. Glad that you shared these tips, such information was much needed for students who are interested in joining merchant navy.

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