Tanker Cargo Studio
MARPOL // ANNEX I & II // IBC CODE
Tanker Stowage Plan Online: Tank Cargo Allocation, ASTM Table 54B & IBC Code
NavLib Tanker Stowage Plan Studio is an interactive marine engineering calculator designed for Chief Officers, Master Mariners, tanker supercargoes, and cargo inspectors. The suite combines an interactive 2D deck plan with tank widths scaled strictly to their volumetric capacity, international calculation standards for oil and chemical parcels, commingled cargo stratification, and clean printable reports isolated from website navigation and advertisements.
In tanker custody transfer, accounting for atmospheric air buoyancy (-0.0011 t/m³ or -1.1 kg/m³) is mandatory. The application features a real-time four-way synchronization grid: tank filling percentage, observed volume (m³), weight in air (WIA), and weight in vacuo (WIV). Adjusting any single metric instantly updates the remaining values based on individual tank temperatures.
Key Features & System Capabilities
Proportional 2D Deck Arrangement
Tank cell widths scale in direct proportion to their maximum capacity (m³), clearly distinguishing large cargo tanks from narrow wings or slop compartments.
Commingled Cargo Stratification
Simulate multiple cargo grades inside a single tank (such as heel residues plus a new grade). The deck visualizer renders an accurate layered cake showing phase boundaries.
Filling Limits & Slack Tank Cockpit
Automatic tracking of slack tanks (10% to 90%) to monitor free surface effects, with amber advisory warnings at 98.0% and emergency alarms at 99.5% capacity.
Ad-Free Isolated Print Engine
Generates a standardized A4 landscape cargo report: website headers, Elementor widgets, and sidebars are excluded, leaving only vessel particulars, diagrams, and signatures.
Frequently Asked Questions (FAQ)
Why is tanker cargo filling restricted to 98% under MARPOL and ISGOTT?
Restricting maximum cargo volume to 98% at the highest anticipated voyage temperature provides safety ullage against thermal liquid expansion, preventing structural bulkhead damage and liquid discharge through high-velocity pressure/vacuum (P/V) valves. The system issues an amber warning above 98.0% and an emergency red alarm at 99.5% and above.
How is Weight in Air (WIA) calculated?
Weight in Air is determined using the standard equation: WIA = GSV * (Density at 15°C - 0.0011), where density is expressed in metric tons per cubic meter (t/m³), and 0.0011 t/m³ represents the standard air buoyancy deduction compliant with API MPMS Chapter 11 and IP guidelines.
How do I export and restore stowage plans across devices?
Use the "Save Plan" and "Load Plan" buttons in the top toolbar to store your current voyage plan as a clean, structured JSON file. Vessel hull dimensions and tank arrangements can also be exported separately via the "Vessel & Tanks" configuration drawer.
How does the print engine prevent site elements from printing?
The suite employs an aggressive document-level print stylesheet that hides the Elementor DOM tree, WordPress admin bars, headers, and footer widgets. When launching the print dialog, only the vector vessel plan, cargo grade tables, tank schedule, and Master / Chief Officer endorsement boxes are sent to the printer or PDF export.
Safety Disclaimer: This application is intended for preliminary stowage planning, volume distribution, and training purposes. Actual loading and discharging sequences must always be verified against the ship's type-approved onboard loading computer to verify hull longitudinal strength (Bending Moments & Shear Forces) and intact stability.
