Equipment Number Calculator [PDF]

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EQUIPMENT NUMERAL CALCULATOR FOR A SHIP Welcome! This excel spreadsheet calculates the Equipment number for a Ship from DNV rules.It further recommends specifications for the anchoring and mooring equipment for the vessel

Directions: Enter all the particulars and the deckhouse/superstructure information required in the Inputs sheet. The Input cells are in blue. For profile area of superstructures/deckhouses, the default value from formula is given. If the actual profile area is different from the default, the user can enter the actual area. Once all inputs have been given, the Equipment number is calculated in Outputs sheet. Based on the Equipment Number and DNV Rules, the minimum required anchoring/mooring equipment number and specifications are also recommended Formula

EN = Δ2/3 + 2 B H + 0.1 A Δ = Rule Displacement in MT B = Rule Breadth in m H = effective height in m from the summer load waterline to the top of the uppermost deckhouse, measured as follows: H = a + Σ hi a = distance in m from the summer load waterline amidships to the upper deck at side (Freeboard) hi = height in m on the center line of each tier of houses having a breadth greater than B/4. For the lowest tier, hi shall be measured at center line from the upper deck, or from a notional deck line where there is local discontinuity in the upper deck

References 1. DNV Rules for Classification of Ships (New building) - Part 3 Chapter 3, Section 3 Anchoring and Mooring Equipment www.thenavalarch.com

EQUIPMENT NUMBER CALCULATION INPUTS Table 1: VESSEL INPUTS Input parameter Displacement (molded) Length on Waterline at Summer Loadline Length between Perpendiculars Breadth (molded) Depth (molded) Summer Loadline Draft

Symbol Δ LWL LBP B D d

Table 2: HEIGHTS AND AREAS OF DECKHOUSES AND SUPERSTRUCTURES

1

Item Forecastle deck DECKHOUSE - A DECKHOUSE - B DECKHOUSE - C DECKHOUSE - D DECKHOUSE - E 2 Bulwark (> 1.5 m) Hatch Coaming (> 1.5 m) Other Other Other Other Other Other

Value 9944 118 110 17.6 9 6.6

Units MT m m m m m

5

Profile 3 Effective Profile Area Area(Default = Height (hi)4, m Length (Li), m (Ai), m2 hi x Li), m2 2.6 11.7 30.42 30.42 2.7 25 67.5 67.5 2.6 18.2 47.32 47.32 2.6 16.8 43.68 43.68 2.6 14 36.4 36.4 2.5 9.8 24.5 24.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Fig 1: Effective Heights of Deckhouses (deckhouses with width < B/4 need not be included)

Note 1 Please include only those deckhouses and superstructures which have a width > B/4 (See Fig 1).Where a house having a breadth greater than B/4 is above a house with a breadth of B/4 or less, the upper house is to be included and the lower ignored 2 Please see Fig 2 for help on how to add area for bulwark > 1.5 m 3 If the profile area of an item is different from the default value (hi x Li), then it needs to be input in the respective cell 4 The height has to be entered at centerline 5 A general naming has been adopted for deckhouses (Deckhouse - A,B, C etc.). Please input the specific names of the deckhouses. Any new deckhouses or other structures can be added to the rows designated 'Other'. If an item is not applicable (e.g., if there is no forecastle) then input the hi and Li and Profile area for the item as zero (0).

Fig 2: Bulwarks with height > 1.5 m (shaded area to be added

EQUIPMENT NUMBER CALCULATION OUTPUTS Input parameter Displacement (molded) Breadth (molded) Rule Length Freeboard from Summer Load line Summation of heights of deckhouses Effective Height from Summer Loadline to top of Deckhouses

Symbol Δ B L a Σ hi

Formula

L = LBP, 0.96LWL < L < 0.97LWL D-d

H

a + Σ hi

Profile area of Hull Profile area of Superstructures and Deckhouses

AH

axL

Total Profile area of Hull + Superstrutures

A

Equipment Number

Value 9944.00 17.60 113.28 2.40 13.00

15.40 m 2 271.87 m 2 249.82 m

AS

2 521.69 m

Ah + As

EQUIPMENT NUMBER Δ2/3 + 2 B H + 0.1 A EN

1056.7

EQUIPMENT SPECIFICATIONS BASED ON CALCULATED EN1 EQUIPMENT NUMBER EQUIPMENT LETTER A. Stockless Bower Anchors Number of Stockless Bower Anchors Mass per Anchor (in kg) B. Stud Link Chain Cables Total Length (m) Diameter For Steel Grade NV K1 For Steel Grade NV K2 For Steel Grade NV K3

1056.7 x 2 3300

495 58 50 46

C. Towline Minimum Length (m) Minimum Breaking Strength (kN) Minimum Breaking Strength (MT)

200 647 66.0

D. Mooring Lines Number Length of each (m) Minimum Breaking Strength (kN) Minimum Breaking Strength (MT)

4 180 250 25.5

1

Units MT m m m m

For selecting the equipments, the next Equipment number higher than the calculated one has been selected from the Table C1, DNV Rules for Ships(2010), Pt3 Ch3 Sec3)

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