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Ballast water management & bwms

2nd Mate
MEO Class 1
MEO Class 2
MEO Class 4
UK Management

times asked: 42; times asked
questions: 12; questions
last asked: 2026; last asked

The slides, written out

AI-drawn illustration. Simplified to explain the idea, not to scale.

Slide 1 · LEARN

LEARN PRACTICE EXCEL SMALL CHANGE. BIGGER OCEANS. BALLAST WATER MANAGEMENT EXCHANGE & BWMS PROTECTING MARINE LIFE FOR A SUSTAINABLE TOMORROW THE RULES BEHIND CLEANER OCEANS CLEANER OCEANS BRIGHTER TOMORROW

Slide 2 · LEARN

LEARN PRACTICE EXCEL BALLAST WATER EXCHANGE KEY HAZARDS AT SEA OPERATIONAL SAFETY | STABILITY | STRUCTURAL INTEGRITY 01 HULL STRENGTH Sequential exchange changes: • Shear forces • Bending moments • Trim • Draft Bending Moment Shear Force Monitor loading condition throughout the operation. 02 STABILITY & FREE SURFACE Partially filled tanks can create free surface effects, reducing effective GM. Stability must be monitored throughout exchange. 03 SEA & WEATHER CONDITIONS Rolling and partially filled tanks can increase operational risk. Exchange should only be carried out when conditions permit safe operation. 04 LIST & TRIM Uneven ballast operations can produce undesirable list or trim changes. List Trim Follow the approved sequence and ballast plan. MASTER'S DECISION + STABILITY ASSESSMENT = SAFE EXCHANGE SAFER SEAS BRIGHTER TOMORROW

Slide 3 · LEARN

LEARN PRACTICE EXCEL BALLAST WATER EXCHANGE D-1 BALLAST WATER EXCHANGE STANDARD WHERE IT APPLIES | HOW TO DO IT | KEY CONSIDERATIONS 01 WHERE D-1 EXCHANGE APPLIES Ballast water exchange must be conducted in the following areas (Regulation B-4): Where possible: If this cannot be achieved: ≥ 200 NM from nearest land As far from land as possible, but at least: ≥ 50 NM from nearest land ≥ 200 m water depth ≥ 200 m water depth 02 D-1 EXCHANGE METHOD AND STANDARD 95% VOLUMETRIC EXCHANGE For the pumping-through method, pumping through 3 × tank volume is considered to meet the D-1 standard. Pumping through less than three times the tank volume may be accepted where the ship can demonstrate that at least 95% volumetric exchange has been achieved. 03 IMPORTANT CONSIDERATIONS Ship safety and stability Weather and sea conditions Equipment limitations Follow the approved sequence and ballast plan PLAN THE EXCHANGE. PROTECT THE SHIP. PROTECT OUR OCEANS. Source: IMO BWM Convention | Regulations B-4 & D-1 IMO G6 Guidelines (as amended) CLEANER OCEANS BRIGHTER TOMORROW

Slide 4 · LEARN

LEARN PRACTICE EXCEL BALLAST WATER MANAGEMENT SYSTEM WHAT DOES THE BWMS ACHIEVE? CLEANER OCEANS | HEALTHIER ECOSYSTEMS | SAFER TOMORROW 01 PURPOSE To prevent, minimize and ultimately eliminate the transfer of harmful aquatic organisms and pathogens through ballast water and sediments. 02 D-2 PERFORMANCE STANDARD Organism / Indicator | Discharge Standard ≥ 50 µm | < 10 viable organisms / m³ ≥ 10 µm and < 50 µm | < 10 viable organisms / ml Toxigenic Vibrio cholerae (O1 and O139) | < 1 cfu / 100 ml Escherichia coli | < 250 cfu / 100 ml Intestinal Enterococci | < 100 cfu / 100 ml 03 TREATMENT TECHNOLOGIES MECHANICAL Filtration / separation PHYSICAL UV and other physical treatment methods CHEMICAL Disinfection / electrolysis-based treatment D-2 is a PERFORMANCE STANDARD. Source: IMO BWM Convention | Regulation D-2 | IMO BWMS Code CLEANER OCEANS BRIGHTER TOMORROW

Slide 5 · LEARN

LEARN PRACTICE EXCEL BWM COMPLIANCE WHAT MUST THE SHIP MANAGE? PLAN | RECORD | TREAT | COMPLY 01 BALLAST WATER MANAGEMENT PLAN (BWMP) BALLAST WATER MANAGEMENT PLAN Ship specific plan approved by the Administration (Regulation B-1). Describes procedures to implement the requirements. 02 BALLAST WATER RECORD BOOK (BWRB) BALLAST WATER RECORD BOOK Records ballast uptake, treatment, discharge and other relevant operations (Regulation B-2). Must be properly maintained and available for inspection. 03 INTERNATIONAL BWM CERTIFICATE INTERNATIONAL BALLAST WATER MANAGEMENT CERTIFICATE Issued to ships subject to the Convention's survey and certification requirements (400 GT and above to which it applies). 04 BALLAST WATER MANAGEMENT SYSTEM (BWMS) Must be type-approved in accordance with the IMO BWMS Code (Regulation D-3). Operate and maintain as per approved documentation and manufacturer's instructions. IMPORTANT D-2 phase-in completed on 8 September 2024 Ships subject to the Convention must comply with the applicable D-2 performance standard. BWM COMPLIANCE PROTECTS OUR OCEANS AND FUTURE GENERATIONS Source: IMO BWM Convention | Regulations B-1, B-2 & D-2 IMO BWMS Code CLEANER OCEANS BRIGHTER TOMORROW

In exams

Asked 42 times across 12 different questions, most recently in 2026. Asked most in 2nd Mate (18), MEO Class 1 (12), MEO Class 2 (5), MEO Class 4 (4).

Drafted by SailR from our daily lessons. AI-drawn illustration. Simplified to explain the idea, not to scale. Last updated 19 Oct 2026.

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