8.3 Bunkering Procedures, SOPEP & Spill Response

8.3 Bunkering Procedures, SOPEP & Spill Response

Bunkering—the transfer of heavy fuel oil (HFO), very low sulfur fuel oil (VLSFO), or marine gas oil (MGO) from a shore terminal, bunker barge, or road tanker into a vessel's bunker tanks—is one of the most hazardous operations routinely conducted aboard merchant ships. Bunkering involves transferring hundreds of metric tonnes of heated, viscous hydrocarbon liquid at high pumping rates and substantial pressures. A failed hose gasket, an unbolted blank flange, an overlooked tank air vent, or an inattentive watchkeeper can cause tons of fuel to overflow onto the deck and pour into harbor waters within seconds. Such incidents can seriously damage the environment and expose the vessel, company and responsible individuals to claims or sanctions under the applicable law.

General Purpose (GP) Ratings play a vital frontline role during bunkering operations: preparing the deck, plugging scuppers, monitoring manifold pressures and save-all trays, checking sounding tapes, and standing by emergency containment gear under the vessel's Shipboard Oil Pollution Emergency Plan (SOPEP).

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1. The Shipboard Oil Pollution Emergency Plan (SOPEP)

Under Regulation 37 of MARPOL Annex I, every oil tanker of $150\text{ Gross Tonnage (GT)}$ and above and every other merchant ship of $400\text{ GT}$ and above must carry an approved Shipboard Oil Pollution Emergency Plan (SOPEP). (Annex II Regulation 17 requires an NLS emergency plan for ships of 150 GT and above carrying noxious liquid substances in bulk. It may be combined with the SOPEP as a Shipboard Marine Pollution Emergency Plan [SMPEP].)

The SOPEP is formally approved by the vessel's Flag State Administration or an authorized Recognized Organization (RO, such as the Indian Register of Shipping [IRS], Lloyd's Register, or DNV). The plan is written in the working language of the Master and officers and consists of four mandatory operational sections:

1. Procedure for Reporting an Oil Pollution Incident: Detailed instructions and standard formats for reporting accidental or operational oil discharges to the nearest Coastal State Authority, Port Authority, Flag State Administration, and Company Designated Person Ashore (DPA). Reports must use the standardized IMO reporting format (using letter prefixes A to X to convey vessel position, course, weather, oil type, estimated quantity, and sea conditions).
2. List of Authorities and Points of Contact: A frequently updated directory containing telephone numbers, email addresses, and 24-hour emergency contacts for coastal state pollution centers, port authorities along the vessel's trade route, ship management emergency response teams, P&I Club correspondents, and salvage contractors.
3. Steps to Control and Mitigate Discharge: Practical operational guidance for the ship's crew to minimize or stop oil outflow resulting from operational accidents (bunkering hose rupture, tank overflow, pipe failure) or maritime casualties (grounding, hull fracture, collision, fire). Steps include stopping pumps, closing manifold valves, initiating internal fuel transfers to empty double bottom or wing tanks, listing or trimming the vessel to bring a damaged hull fracture above the waterline, and deploying containment gear.
4. Shipboard Coordination with Local and National Authorities: Guidelines governing how shipboard personnel must cooperate with harbor masters, coast guard strike teams, cleanup contractors, and maritime investigators, ensuring clear lines of command and designated spokespersons.

The SOPEP Emergency Locker

Ships commonly keep response equipment in a SOPEP Locker near the bunker manifold or another accessible position. The ship’s plan specifies the equipment and responsibilities; there is no universal hardware list for every vessel. Ratings must know its location and use, maintain access, and check the assigned inventory. Typical equipment includes:

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2. Bunkering Safety Checklist and Deck Precautions

Bunkering demands strict adherence to rigorous safety checklists from several hours before connection until after the bunker manifold is uncoupled and blanked.

Phase 1: Pre-Bunkering Safety Meeting

Prior to commencing transfer, a mandatory safety meeting is held on board, chaired by the Chief Engineer and attended by the Second Engineer, the Bunkering Barge Master or Shore Terminal Representative, and the deck watch ratings:

• Verify fuel grades, delivery quantities, and specific tank allocation sequence;
• Agree a low initial flow rate (in tonnes/hour or cubic metres/hour) and safe manifold pressure (in bar) to verify the correct tanks are filling and check for leaks;
• Agree the maximum transfer rate and manifold pressure within the receiving system’s limits; increase flow only after the initial checks are satisfactory;
• Establish topping-off procedures, including advance notice (e.g., 30-minute and 15-minute warnings) and reduction of pumping rate;
• Confirm emergency shutdown signals (radio channels, hand signals, horn blasts, and emergency phrase: "STOP BUNKERING IMMEDIATELY");
• Verify completion and joint signing of the Ship-Shore Safety Checklist.

Phase 2: Physical Deck Precautions (GP Rating Checklist)

Before bunker hoses are hoisted and connected, ratings must carry out vital physical precautions on deck:

1. Plug ALL Deck Scuppers: Every deck scupper, freeing port, and fishplate drain around the main deck perimeter must be plugged oil-tight using mechanical expanding rubber plugs or wooden plugs driven in and sealed with cement. This creates an oil-retaining 'bathtub' on deck, ensuring any leaked oil remains trapped on board rather than escaping into the harbor.
2. Blank Unused Manifolds: Unused bunker manifold connections on both port and starboard sides must be sealed with heavy steel blank flanges. Every single bolt hole must be fitted with a proper bolt and nut, fully tightened against an oil-resistant gasket (leaving bolt holes empty or using G-clamps is strictly forbidden).
3. Save-All Drip Trays: Ensure save-all trays beneath the bunker manifold and fuel tank air vents are dry, clean, and have their drain valves closed and screwed tight with plugs in place.
4. Stage Firefighting Appliances: Place the suitable portable extinguishers required by the bunkering checklist at the station, accessible without entering a spill. Have the specified fire hoses and foam equipment ready for use. Confirm the fire main and appliances are available, and follow the ship’s and terminal’s agreed firefighting arrangements.
5. Day / Night Warning Signals:
   • Daytime: Hoist international maritime signal Flag 'B' (Bravo)—a bright red swallowtail flag meaning "I am taking in, discharging, or carrying dangerous goods / fuel".
   • Nighttime: Display the all-round red warning light in the position and with the visibility required by the port and ship’s procedures; do not confuse it with the vessel’s navigation lights.
6. Strict Smoking and Hot Work Bans: Post conspicuous "NO SMOKING / NO NAKED LIGHTS" signs at the gangway and manifold. Extinguish galley naked flames if required by local port rules. All hot work (welding, burning, grinding) on deck or in machinery spaces is strictly prohibited throughout bunkering.

Phase 3: Tank Filling Limits and Expansion Space

+-------------------------------------------------------------+
|               FUEL OIL STORAGE TANK (SIDE VIEW)             |
+-------------------------------------------------------------+
|                                          [Air Pipe / Vent]  |
|     EXAMPLE: 10% to 15% ULLAGE              |          |
|   (Essential thermal expansion margin)           |          |
| - - - - - - - - - - - - - - - - - - - - - - - - -|- - - - - |
| ~~~~~~~~~~~~ EXAMPLE FILLING LEVEL (85% to 90%) ~~~~~~~~~~ |
|                                                             |
|                                                             |
|                 HEATED FUEL OIL CARGO                       |
|               (Expands as heat increases)                   |
|                                                             |
|                                                             |
+-------------------------------------------------------------+

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3. Bunker Delivery Note (BDN) & MARPOL Fuel Oil Sampling

Under MARPOL Annex VI Regulation 18, receiving bunker fuel involves strict statutory documentation and chemical verification:

• Bunker Delivery Note (BDN): Check ship name/IMO number, port/date, supplier contacts, product, tonnes, density at $15^\circ\text{C}$, sulfur content and the supplier’s signed compliance declaration. Include the measured flashpoint, or a statement that it is at least $70^\circ\text{C}$. From 1 January 2026, obtain the supplier’s SOLAS flashpoint-compliance declaration before bunkering. Sulfur limits are $0.50\%$ globally and $0.10\%$ in applicable ECAs unless an approved equivalent applies. Viscosity and the ship’s receipt signature may be additional commercial details. Retain the BDN for three years after delivery.
• MARPOL Representative Sample: Collect continuously throughout delivery at the receiving ship’s inlet bunker manifold. Current IMO guidance allows a manual continuous-drip sampler, a time-proportional automatic sampler or a flow-proportional automatic sampler. Ship and supplier representatives witness collection; protect the sample against contamination and tampering.
• Sample Container and Security Seal: Thoroughly mix the primary sample before filling a clean, dry retained-sample container. Retain at least 600 mL, filling the container to 90% ± 5% capacity. The supplier seals it in the ship representative’s presence with a uniquely identified tamper-proof seal. Label it with the required particulars and both representatives’ names/signatures; the ship representative is the Master or officer in charge.
• Sample Retention: The primary official MARPOL Annex VI sample bottle must be kept onboard under the ship's control for at least twelve (12) months from the date of delivery (or until the fuel is substantially consumed, whichever is longer) for inspection and laboratory verification by Port State Control.

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4. Immediate Shipboard Spill Response Actions

If an oil leak, hose blowout, or tank overflow occurs during bunkering, response actions must be instantaneous and systematic:

1. EMERGENCY STOP (SHUT DOWN): Immediately give the agreed emergency stop signal to the supplier and operate any fitted emergency shutdown. Stop transfer and isolate the leak using the agreed pump/valve shutdown procedure. Coordinate valve closure with the supplier to avoid dangerous line pressure; do not assume a local button controls the supplier’s pump.
2. SOUND THE ALARM: Immediately alert the Bridge and Engine Control Room (ECR). Sound the ship's general emergency alarm (seven short blasts followed by one prolonged blast on the ship's whistle and alarm bells) or broadcast over the public address (PA) system: "Emergency! Oil spill on deck! Muster all hands for SOPEP response!"
3. CONTAIN OIL ON DECK: Check that scupper plugs remain secure to ensure no oil escapes overboard. Deploy sorbent booms and sweeps downwind and downstream of the spill on deck. Position sand or sawdust dams around deck openings, cable transit trunks, and accommodation doorways.
4. RECOVER POOLED OIL: Rig and start the portable air-operated diaphragm (Wilden) pump to transfer pooled fuel from save-all drip trays back into an overflow tank, dirty oil tank, or waste salvage drums. Mop up residual oil films with sorbent pads.
5. INITIATE SOPEP REPORTING: The Master immediately reports the spill to the nearest Coastal State Maritime Rescue Coordination Centre (MRCC) and Port Authority using the standard IMO reporting format.