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Oil Tanker Mooring Requirements

The document outlines mooring restraint requirements for oil tankers above 16,000 deadweight tonnage (DWT). It provides four formulas to calculate the minimum breaking load requirements for spring lines and breast lines based on ship characteristics like DWT, length, breadth, draft, and design/ballast draft areas. The formulas consider factors like ship size and shape to determine the number and strength of mooring lines needed to securely dock large oil tankers. Ship data is also provided applying the formulas for sample tankers of various sizes.

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Dewi Cuantik
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110 views3 pages

Oil Tanker Mooring Requirements

The document outlines mooring restraint requirements for oil tankers above 16,000 deadweight tonnage (DWT). It provides four formulas to calculate the minimum breaking load requirements for spring lines and breast lines based on ship characteristics like DWT, length, breadth, draft, and design/ballast draft areas. The formulas consider factors like ship size and shape to determine the number and strength of mooring lines needed to securely dock large oil tankers. Ship data is also provided applying the formulas for sample tankers of various sizes.

Uploaded by

Dewi Cuantik
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as XLSX, PDF, TXT or read online on Scribd
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SPRING LINES REQUIREMENTS BREAST LINES REQUIREMENTS SPRING LINES REQUIREMENTS BREAST LINES REQUIREMENTS BOLLARD

SHIP DATA (use of formula 22) (use of formula 23) (use of formula 24) (use of formula 25) CAPACITY

DWT LBP B D d or T TLBP ATF ATB ALB ALF S S x MBL22 MBL22 BR BR x MBL23 MBL23 S S x MBL24 MBL24 BR BR x MBL25 MBL25

ton m m m m m m2 m2 m2 m2 point kN ton point kN ton point kN ton point kN ton ton
8,000 96 25 5.5 4.5 4.5 355 443 1650 1010 4 952 24 8 1497 19 4 785 20 8 8 0 50
50,000 204 32.3 17.6 12.6 6.08 548 734 2830 1690 4 1691 42 8 2502 31 4 1782 45 8 5395 68 80
90,000 234 39.6 20.6 14 6.68 755 1044 4200 2492 4 2368 59 8 3687 46 4 2373 59 8 7624 96 100
100,000 240 40.1 21.1 15.4 6.8 761 1080 4270 2490 4 2452 61 8 3684 46 4 2442 61 8 8426 106 106
200,000 318 52.6 28.7 18.9 8.36 1060 1570 6430 3670 4 3618 90 12 5428 45 4 3919 98 12 16179 135 150

- Mooring restraint requirements for Oil Tankers above 16kDWT


Formula :
1 Spring lines : S x MBL = 1.992 ATB + 0.369 (0.01 LBP2 +LBP) (22)
2 Breast lines : BR x MBL = 1.476ALF + 1.291TLBP (23)
3 Spring lines : S x MBL = 1.992 DB - 0.0398 LBP + 19.9B + 40 + 0.369
(24)(0.01LBP2 +LBP)
4 Breast lines : BR x MBL = LBP (1.55 (D-T) + 1.291 T + 2.06 (25)

Where:
S = Total number of spring lines
BR = Total Number of berast lines
MBL = Minimum breaking load of each line in kN
T = Maximum (summer) vessel draft
D-T = the freeboard midships in the full load condition

Oil Tanker
(Deadweight tonnage
(Displacement is the
is the total carrying
weight capacity
or mass ofship
of the the ship namelyby
is obtained themultiplying
total weight
theofvolume
cargo, fuels,
of fresh water, etc)
water displaced by the ship by the density of the water.
(Length of Perpendicular)
(Breadth of Vessel)
(Draft + Freeboard of Vessel)
(Draft of Vessel)

(Area Transversal design draft) (see Port-designers-handbook, recommended & Guidelines, Chapter 20 Ship Dimension, page 486)
(Area Transversal ballast draft) (see Port-designers-handbook, recommended & Guidelines, Chapter 20 Ship Dimension, page 486)
(Area Longitudinal ballast draft) (see Port-designers-handbook, recommended & Guidelines, Chapter 20 Ship Dimension, page 486)
(Area Longitudinal design draft) (see Port-designers-handbook, recommended & Guidelines, Chapter 20 Ship Dimension, page 486)
ALF ALB ATF ATB

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