Midship Scantling Designer

Baltic Laker GC — LR Pt 4 Ch 1

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Project Information
Report Assets
Ship Particulars & Design Parameters
Main Dimensions
m
m
m²
m²
Fr.
Fr.
Fr.
m
Still-Water Bending Moment
Still-Water Shear Force
kN·m
kN·m
Advanced — rule settings & optimizer preferences hull girder factors, zone k, profile filter
Hull girder factors from LR Pt 3 Ch 4
Material & Hull Girder
Zone k-value Selection (LR Pt 3 Ch 2)
Profile Filter Preference
Dropdowns show only profiles where Z_section ≥ Z_req AND safety ≤ margin limit AND slenderness OK. YOU pick from the filtered list.
Frame Table
Draughts
m
t
m
m
m
m
Ice Class Calculations (FSICR) DISABLED · click to expand
Ice Waterlines (FSICR 2021 · 4.2 – 4.4)
Engine & Framing
① Plate Ice Belt (Reg. 4.3.1) — mm
② Frame Strengthening (Reg. 4.4.1) — mm
Ice pressure p (before c_a) — MPa
Engine power status —
FSICR plate t_req (current side s) — mm
FSICR Z_req (current spacing) — cm³
FSICR Z_req (intermediate s/2) — cm³
FSICR governs over LR? —
Intermediate Longitudinal Insertion
Inserts an intermediate longitudinal at the midpoint between every adjacent side-shell longitudinal pair whose midpoint falls inside the FSICR Frame Ice Strengthening zone (Reg. 4.4.1). Click again to refresh after changing inputs (existing intermediates with the "ice" tag are removed and re-inserted). Inner side, decks, and bottom shell are NOT affected. Profile inherits from the lower neighbour.
No ice intermediates inserted.
1. Bottom Shell (Plate + Longitudinal)
Plate (LR Table 1.5.2)
Longitudinal (LR Table 1.6.1 Location 3)
2. Inner Bottom (LR Pt 4 Ch 1 Sec 8.4)
Plate Configuration (Sec 8.4.1 + 8.4.2 + 2.2.2 + 8.4.4)
Longitudinal (Sec 8.4.5 — Z ≥ 0.85 × Z_bottom)
Sec 8.4.1: t = 0.00136·(s + 660)·⁴√(k²·L·T) mm. Min 6.5 mm (holds), 7.5 mm (hatchway, no ceiling).
Sec 8.4.2: +2 mm under hatchways if ceiling omitted.
Sec 2.2.2: +3 mm (grab + ceiling) or +5 mm (grab + no ceiling, alt.).
Sec 8.4.4: If DB common with side tank/cofferdam → deep tank formula (h to highest point).
3. Side Shell Plate — 6 Strakes (LR Table 1.5.3)
Weld seams at 1900, 3880, 6360, 8690, 11170, 13420 mm ab baseline. Strake 6 extends to upper deck (15300).
Strakez1 (mm)z2 (mm)H (mm)Mid z (m)Max s (mm)t (mm)Gov
4. Side Shell Longitudinal — 18 Positions (LR Table 1.6.1)
Fixed positions: 2375, 2950 (LR required), 10700 (user-fixed). z < 12900: Location (2) tank; z ≥ 12900: Location (1) dry.
#z (mm)Spacing (mm)StrakeRegionLocZ_req (cm³)Group
Profile Groups
GroupLongsZ_max (cm³)Plate (mm)ProfileZ_sec (cm³)Safetykg/m
5. Inner Side (Longitudinal Bulkhead)
Inner side extends 1800 → 16350 mm, three regions:
Deep Tank (1800–12900 mm) — LR Pt 4 Ch 1 Sec 9.2.1, Table 1.9.1 (deep tank):
· Plating: t = 0.004·s·f·√(ρ·h₄/1.025) + 2.5 mm, min 7.5 mm (L ≥ 90)
· Stiffener: Z = ρ·s·k·h₄·l_e² / (22·γ·(ω₁+ω₂+2)) cm³, γ=1.4, ω₁=ω₂=1.0 (bracketed)
· h₄ = max(tank_top − z, (overflow − z)/2)
Void (12900–15300 mm) — Sec 9 min (non-WT); Coaming (15300–16350 mm) — Pt 3 Ch 11.
Strakez1 (mm)z2 (mm)RegionMax s (mm)h_4 (m)t (mm)Rule
Inner Side Longitudinal Groups
Groupz rangeLongsRegionZ_max (cm³)ProfileZ_seckg/m
6. DB Internals (Girders, Floors — LR Pt 4 Ch 1 Sec 8)
ElementCountt or dim (actual)GeometryRuleFormulat_req (mm)Status
Sec 8.3.1 — Centre girder depth: d_DB = max(28·B + 205·√T, min(50·B, 2000), 760) mm.
Sec 8.3.2 (last sentence) — d_DB for thickness: The thickness may be determined using d_DB without applying the minimum depths (b) and (c) from 8.3.1. Tool now uses formula (a) only, i.e. d_DB(a) = 28·B + 205·√T, even if the as-built IB is taller. Both values are shown in the dim column.
Sec 8.3.5 — Side girders (longitudinally framed ships): One side girder is to be fitted where B > 14 m, and two girders on each side of the centreline where B > 21 m. The girders are to extend as far forward and aft as practicable and shall have thickness not less than (0.0075·d_DB + 1)·√k mm, min 6.0 mm. A vertical stiffener (≥ 100 mm depth, thickness = girder t) is to be arranged midway between floors.
Sec 8.3.8 — Duct keel: Replaces centre girder; side plates t ≥ greater of: (a) (0.008·d_DB + 2)·√k mm, or (b) deep-tank formula (Tablo 1.9.1: 0.004·s·f·√(ρ·h₄·k/1.025) + 2.5) if duct interconnected with side tank / cofferdam. h₄ measured from (z_bot + H/3) to top of side tank, OR half to overflow. Min 6.0 mm (Sec 8.3.8) & 7.5 mm (Tablo 1.9.1, L≥90). Sides spaced ≤ 2.0 m apart.
7. Decks — LR Pt 4 Ch 1 Sec 4 (Tables 1.4.1 – 1.4.4)
Stringer Deck (inside ballast tank — Sec 9 deep tank)
Tween Deck (void space — minimum platform)
Upper Deck (Strength/Weather — Table 1.4.1 plate + 1.4.3 long.)
Hatch Coaming Top (Pt 3 Ch 11 — deck box closure)
Baltic Laker — actual layout: Stringer deck is inside ballast tank (Sec 9 deep tank rules apply). Tween deck is in the void space above tank top (no design load — minimums only). Upper deck is the weather/strength deck.

Stringer (deep tank) plate: t = 0.004·s·f·√(ρ·h₄/1.025)+2.5 mm (Table 1.9.1 DT, min 7.5 mm L≥90)
Stringer (deep tank) long: Z = ρ·s·k·h₄·l_e²/(22·γ·(ω₁+ω₂+2)) cm³ (γ=1.4, ω₁=ω₂=1)
Tween (void) plate: Table 1.4.8 minimum (6.5 mm for L≥90, 5.5 mm for L<90)
Tween (void) long: No design load — minimum stiffening per Sec 9 / Pt 3 Ch 3
Upper deck (strength/weather, long): t = max[0.001·s₁·(0.059·L₁+7)·√(F_D/k_L), 0.00083·s₁·√(L·k)+2.5]
Upper deck long (outside openings): Z = 0.043·s·k·h_T1·l_e²·F₁ cm³ (Table 1.4.3)
Geometry DRAW MODE Review geometry only. Click "Run Analysis" to check LR rule compliance.
Info
▸Section Properties
Midship Section
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Profile Editor
M_max —
Mode Draw
Total Elements
—
items
Plate Weight
—
ton (Var. 1B)
Long Weight
—
ton (Var. 1B)
Grand Total
—
ton steel
Status
—
compliance
Hull Girder — Section Properties LR Pt 3 Ch 4 Sec 5.4 / 5.8
Quantity Required Provided Ratio Status Notes
Run analysis on the Geometry page first to populate this table.
Plates / Strakes — All Elements Local rule + HG stress (Sec 5.7) + Buckling (Sec 7)
Element Rule t_req (mm) t_prov (mm) Local Hull Girder Buckling Overall
Run analysis on the Geometry page first to populate this table.
Longitudinal Stiffeners — All Elements Z_req (Pt 4 Ch 1) + HG stress + Column/Local buckling (Pt 3 Ch 4 Sec 7)
Element Profile z (mm) s (mm) Z_req (cm³) Z_sec (cm³) Local Hull Girder Buckling Overall
Run analysis on the Geometry page first to populate this table.
Element Summary (legacy)
ElementRuleRequiredProvidedWeight (ton)Status
Design Assumptions
Hull girder F_B, F_D (to be verified after midship SM)0.85 / 0.85
Material (k = k_L)AH36 (0.72)
Corrosion AdditionNone (LR as-built, Pt 3 Ch 2)
L_1 = min(L, 190) (cap, both variants)190 m
C_w (wave head coefficient)6.39 m
F_λ (wave head multiplier, L > 200 m)1.0
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Bulkheads
Transverse and longitudinal bulkheads — plating, stiffeners and stools — will be defined here.
Preference
Catalogue
Compartments