Ammonia-Powered Tankers: Work for Port Suppliers

Maersk Tankers' RIPPLE retrofit project has been selected for support under the European Union's Innovation Fund, pending the grant agreement. The plan would fit dual-fuel, two-stroke ammonia engines on four very large ammonia carriers, according to Splash247 (October 2026).

For a ship chandler, bunker supplier, port agent or repair yard, the commercial question is narrower than the fuel debate: which port calls does an ammonia-burning gas carrier generate, and who gets the work?

What Maersk Tankers is actually doing

The project would equip vessels with dual-fuel engines so they can burn ammonia as marine fuel, the company says in its own update reported by Hellenic Shipping News (October 2026). The four ships are Very Large Ammonia Carriers, gas carriers built to move ammonia as cargo.

The funding selection is not a completed conversion. The Maritime Executive (October 2026) reports the proposal covers retrofitting the company's VLACs, with the grant agreement still to be finalised.

Why a retrofit matters more than a newbuild

A retrofit puts an existing hull into a yard, with tanks, piping, engine room and safety systems opened up. That is a different work package from a newbuild, and it lands at a specific berth on a specific date.

Ammonia is not a drop-in fuel. A 2023 study in Renewable and Sustainable Energy Reviews on an ammonia/diesel dual-fuel marine engine found high ammonia slip and high nitrogen oxide and nitrous oxide emissions among the main issues, with combustion and injection timing shaping the results (Elsevier). Handling and containment get the same scrutiny ashore.

IEEE Spectrum (2021) noted that ammonia needs no high-pressure tanks or cryogenic dewars, unlike hydrogen, which is why it gained favour as a marine fuel candidate. Yard and terminal procedures still have to treat it as a toxic gas.

What an ammonia VLAC needs at the port call

• Yard time and hot work. Engine changeover, tank work and piping modifications need a gas dangerous zone plan (the agreed map of hazardous areas and permitted work) before any hot work is approved.
• Spares and technical support. Fuel-system components, instrumentation and maker specialists arrive as freight, often at short notice.
• Bunkering and fuel logistics. Even a dual-fuel ship running on ammonia needs pilot fuel and lubricants, and a trial schedule that is fixed before the berth window.
• Husbandry and agency. Crew change, permits, cash to master and shore transport during a longer-than-usual stay.
• Safety and training. Crew and shore staff need ammonia-specific procedures, which is a service in itself.

The wider fleet signal is not only about ammonia

Decarbonisation work is spreading across ship types, and each stream creates port-call demand. ClassNK has released an onboard carbon capture implementation handbook for owners and operators considering the technology, according to Hellenic Shipping News (October 2026).

The skills gap is the constraint. According to Hellenic Shipping News (October 2026), 82% of maritime professionals surveyed for OneOcean and Thetius research said current training does not adequately prepare crews for digitally enabled operations, and only 18% believed training keeps pace.

Read that as a buying signal. Ship managers facing new fuel systems and new monitoring equipment buy training, documentation and shore support alongside the hardware.

Where the port-call demand sits by segment

SegmentWork an ammonia retrofit or gas-carrier call creates Ship chandlerCabin, deck and engine stores for a longer stay, plus specialist consumables for fuel-system work Bunker supplierPilot fuel, lubricants and trial stems, quoted against a berth window that moves Port agentPermits, crew change, shore services and coordination with yard and terminal Repair yardEngine changeover, piping, tank work and safety-scoped hot work Marine service companyCalibration, inspection, gas detection, training and documentation support

The timing problem is the same one covered in what the new ammonia dual-fuel gas fleet means for suppliers: the vessel is fixed, the yard slot is fixed, and the supplier who quoted late is out.

How suppliers should respond now

1. Map the gas-carrier fleet calling your ports. Track VLACs and LPG carriers by name, IMO number and ETA (estimated time of arrival), not by rumour.
2. Identify the technical manager, not just the owner. Retrofit and fuel-system decisions sit with technical and purchasing superintendents, who are usually at the manager.
3. Prepare an ammonia-capable service sheet. State what you can supply, your safety procedures and your response time, in one page.
4. Contact before the berth window opens. A retrofit stay is planned weeks ahead; a first email the day the ship arrives is too late.
5. Keep the safety file current. Gas-dangerous work, permits and crew competence will be checked before you are allowed aboard.

Dry bulk and container markets move on their own cycle. The Baltic Dry Index fell 1.2% to 2,660 points on Friday, according to Hellenic Shipping News (October 2026), while the Drewry World Container Index rose 2% in the same week (Hellenic Shipping News, October 2026). Neither changes the gas-carrier retrofit case, but both affect how much yard and berth capacity is free when a VLAC is ready.

How VesselReach helps

Retrofit and gas-carrier calls reward suppliers who reach the right manager before the berth window is fixed. VesselReach, built by CatalystIQ, turns vessel movements at your chosen ports into those conversations.

• Vessel intelligence: see gas carriers near your ports and expected arrivals, which means you can quote before the ship sails for the yard.
• AI company targeting and decision-maker discovery: identify the manager behind each vessel and find technical, purchasing and fleet roles, which means your service sheet reaches the person who signs.
• Multichannel outreach with automated follow-ups: staged email, WhatsApp and phone contact, which means a moving ETA does not lose the enquiry.

Book a VesselReach demo and test it on the gas carriers calling your ports, with a 10-day free trial offered after the meeting.