How Marine Transportation Is Procured

8.1 The Tanker Charter Market and the Main Chartering Models

The tanker market exists because the owner of the cargo and the owner of the vessel are often not the same party. A producer, trader, or refiner may need to move oil without owning ships. A shipowner may own ships without owning any oil. The charter market brings these two together.

At the center of the system are four main actors. The first is the shipowner, which owns the vessel and seeks to earn a return on it. The second is the charterer, the party that hires the vessel. The charterer may be a trader, oil major, national oil company, refiner, product marketer, or, in some cases, another shipping company. The third is the shipbroker, who acts as intermediary, bringing cargoes and ships together, helping negotiate terms, and providing market intelligence. The fourth is the operator, a term that can mean different things in different contexts but often refers to the party managing the commercial employment of the ship or executing the charter in practice.

The basic commercial question in tanker chartering is this: how much control over the vessel does the cargo side want, and how much operating exposure does it want to assume? Different chartering models answer that question differently.

At one end of the spectrum is the spot voyage market. Here, the charterer hires a vessel for a particular cargo and voyage. The owner provides the ship, crew, technical management, and much of the voyage execution capability. The charterer pays freight for that specific movement. This is the dominant model for many crude and product cargoes because it allows flexibility. A trader with a one-off cargo from West Africa to India does not need to control a ship for six months; it only needs transport for one voyage.

Further along the spectrum is the period market, in which vessels are hired for longer durations, typically through time charter arrangements. Here the charterer is buying time on the vessel rather than only one specific trip. This can make sense for companies with recurring shipping needs, broad trading portfolios, or a desire to manage freight exposure across multiple cargoes. A refiner importing crude every month, or a trader with a large regional products program, may prefer period tonnage because it gives more control over deployment and can reduce exposure to short-term freight spikes.

Then there are more structural arrangements, such as contracts of affreightment, which commit vessel capacity over a series of cargoes, and bareboat charters, which shift even more operational responsibility to the charterer. These are used in more specific circumstances and reflect different degrees of control and risk assumption.

The tanker market is therefore not one single market but several overlapping ones. There is a spot market for immediate cargoes. There is a period market for ship time. There are longer-term capacity arrangements. There are specialist segments by cargo type and vessel class. There are also distinct markets for crude tankers, clean product tankers, dirty product tankers, shuttle tankers, chemical tankers, and gas carriers, each with its own conditions and commercial norms.

Another important feature of the market is that freight is not determined solely by ship availability in the abstract. It depends on tonnage position. In tanker language, owners and brokers care where ships are open, meaning where and when they will become available for a new fixture. A VLCC open in the Arabian Gulf is not equivalent to a VLCC open in the Mediterranean if the cargo needs to load in the Gulf next week. Geography, ballast distance, canal constraints, port approvals, and the vessel’s prior employment all affect true availability.

The charter market is also influenced by vetting and acceptability. Not every vessel that is technically large enough for a cargo is commercially acceptable to every terminal, oil major, or refinery. Counterparties may impose age limits, flag restrictions, classification requirements, condition standards, sanction compliance checks, and terminal approval criteria. In practice, that means the “available fleet” for a given cargo is often narrower than the nominal fleet in that size class.

A further feature of the market is cyclicality. Tanker supply changes slowly because vessels take years to build, while freight demand can shift rapidly with oil production, refinery demand, trade-route changes, sanctions, canal disruptions, and floating-storage economics. As a result, freight markets can move sharply. Charterers therefore need not only execution skill but also judgment about timing, cover strategy, and exposure management.

The charter market, in short, is a specialist commercial environment in which freight is bought and sold under tailored arrangements. The right model depends on the charterer’s shipping needs, risk appetite, and portfolio strategy.

8.2 Voyage Charters, Time Charters, Bareboat Charters, and Contracts of Affreightment

The main charter forms differ in a deceptively simple way: they allocate time, voyage cost, and operational control differently between owner and charterer. That allocation determines who benefits when things go well and who suffers when they do not.

A voyage charter is the most common arrangement for one-off oil cargoes. Under a voyage charter, the owner agrees to carry a specified cargo between named load and discharge ports, and the charterer pays freight for that voyage. The owner generally remains responsible for the vessel itself: crew, technical operation, maintenance, insurance for the ship, bunkers in some commercial sense depending on pricing structure, and navigation. The charterer’s main obligation is to provide the cargo and pay freight, while also complying with the contractual loading and discharge terms.

From the charterer’s perspective, the attraction of a voyage charter is clarity. The freight cost is tied to a specific movement, so the charterer does not take full exposure to the vessel’s future idle time or repositioning after the voyage. From the owner’s perspective, the attraction is that the ship can be employed cargo by cargo in the spot market and repriced as market conditions evolve. Most opportunistic cargo trading relies heavily on voyage charters for this reason.

But voyage charters place great importance on laytime and demurrage, because the owner is giving up the vessel for a specific voyage and expects loading and discharge to occur within agreed time limits. If the charterer or cargo-side conditions cause delays beyond allowed laytime, demurrage is usually payable. This is one of the main ways time risk is allocated in the voyage market.

A time charter works differently. Under a time charter, the charterer hires the vessel for a defined period—say six months or one year—and pays hire, usually on a daily basis. The owner continues to provide the vessel, crew, technical management, and certain insurances, but the charterer gains commercial control over where the ship goes, subject to agreed trading limits and vessel suitability. The charterer usually pays voyage-related costs such as bunkers and port charges during the charter period.

The attraction of the time charter is flexibility. A charterer with multiple cargoes can deploy the ship across different routes instead of negotiating a new voyage charter each time. This can be especially valuable for integrated companies and large traders with repeat business. It also gives the charterer more direct exposure to freight market conditions. If the charterer locks in a vessel at an attractive hire rate and employs it well, it can outperform the spot market. If market rates fall or the vessel is underutilized, the charterer bears that downside.

A bareboat charter goes further still. Under a bareboat arrangement, the charterer takes over the vessel essentially without crew or technical management and assumes much broader operational responsibility. The charterer becomes responsible for crewing, technical operation, many insurances, and day-to-day running. This is much closer to leasing an asset than buying a transport service. Bareboat charters are far less common in ordinary oil trading and are more relevant where a company wants long-term control of tonnage without outright ownership, or in project and fleet-structuring contexts rather than routine cargo trading.

A contract of affreightment, often shortened to COA, sits somewhat differently from the other forms. A COA is not primarily about hiring one named vessel. It is about securing transport for a series of cargoes or a defined volume over time. The shipowner or carrier agrees to move a certain number of cargoes or a certain aggregate quantity between specified locations over a defined period, but may use different vessels to perform the commitment. The charterer is buying capacity and freight coverage rather than one ship’s time.

COAs are particularly useful when a company has recurring movements but does not need or want to control specific ships continuously. A producer exporting regular parcels from one terminal, or a refiner moving a steady product flow between two regions, may prefer a COA because it secures freight capacity without the complexity of managing every voyage on a purely spot basis. Owners like COAs when they provide volume visibility and support fleet planning. Charterers like them when they provide reliability and reduce spot-market exposure.

In practice, many companies use a mix of these arrangements. A refiner may cover part of its freight needs under COAs, keep some time-chartered tonnage for flexibility, and still use spot voyage charters for incremental cargoes. A trader may operate mostly in the spot market but use time charters when it expects sustained arbitrage flows. An NOC may run recurring programs under longer-term freight arrangements while placing ad hoc parcels into the spot market.

The important point is that these forms are not interchangeable paperwork. They embody different strategies. Voyage charters buy transport for one movement. Time charters buy commercial control of a vessel for a period. Bareboats buy near-ownership control without owning the asset. COAs buy repeated lifting capability. The right choice depends on volume visibility, market view, operational capability, and appetite for freight risk.

8.3 How Freight Is Purchased: Direct Negotiation, Brokered Negotiation, and Tenders

Once the chartering model is chosen, the next question is how the ship is actually fixed. In oil shipping, freight is rarely “purchased” through a public price list. It is usually procured through a market process involving direct approaches, brokered negotiation, or formal tenders.

The most common route is brokered negotiation. The charterer, often through an internal chartering desk, sends an indication of cargo requirements into the broker market: cargo type, volume, loading area, laycan, discharge range, and any special vessel requirements such as heating capability, coated tanks, age limits, or major approvals. Brokers then approach relevant owners or other brokers with suitable tonnage. Owners respond with their level of interest, vessel position, and proposed freight terms. The negotiation proceeds through offers and counteroffers until the parties agree the main commercial terms, often referred to as a fixture.

Brokers are central to the tanker market because they do more than relay messages. Good brokers know vessel positions, owner behavior, cargo programs, market tone, port issues, and the credibility of both sides. They help shape negotiation strategy and often reduce the information gap between fragmented market participants. In highly liquid tanker markets, the broker network is effectively part of the market infrastructure.

Some freight is arranged through direct negotiation, especially where the charterer and owner already know each other well or where the freight requirement is recurring. Large oil companies, traders, and shipowners often maintain direct commercial relationships. Even in those cases, brokers may still be involved on one or both sides, but the negotiation can be more relationship-driven and less broadly circulated. Direct negotiation can be faster and more discreet, which matters when the cargo itself is commercially sensitive or when the charterer wants to minimize market signaling.

Then there are tenders, which are used when the charterer wants to test multiple owners or shipping counterparties in a formal process. A freight tender may invite bids for a particular cargo, a program of cargoes, or even a longer-term transportation requirement. Tenders are particularly common among national oil companies, large refiners, state buyers, or companies with procurement rules requiring competitive bidding. They can also be used for COAs or recurring shipping programs.

The advantage of a tender is competitive tension and documented process discipline. The drawback is reduced flexibility. Owners may be more cautious in tender bidding if they cannot explore nuances directly with the charterer, and the charterer may receive prices that are formally competitive but operationally less tailored. In volatile freight markets, tender timing also matters. A tender that remains open too long may become detached from live market levels.

In all these cases, freight procurement is influenced by more than price. The charterer also evaluates vessel suitability, owner performance, sanction compliance, insurance adequacy, terminal acceptance history, and documentary quality. For some cargoes, especially for major oil company business or sensitive products, the cheapest vessel is not automatically the best vessel. A low freight quote from an owner whose ship is likely to fail vetting or face terminal delays can become the most expensive option in practice.

Once commercial terms are agreed, the fixture is usually recorded first in a short fixture recap, followed by the more detailed charter party based on a standard form and rider clauses. The recap is critical because it captures the main commercial terms that were actually negotiated: freight, laytime, demurrage, loading and discharge terms, options, approvals, and key warranties. The longer charter party then elaborates the detailed legal framework. As in oil sales contracts, experienced parties know that the quality of this documentation matters greatly when disputes arise.

Thus, freight procurement is both a market exercise and a risk-screening exercise. The charterer is not merely buying steel floating on water. It is buying dependable carriage by a vessel that will be acceptable, available, and commercially manageable under the circumstances of the trade.

8.4 Freight Rates, Demurrage, Detention, and the Economics of Vessel Selection

Freight looks simple from a distance: one ship, one cargo, one price. In reality, freight economics are driven by several linked variables, and the visible rate is only part of the story.

Freight rates may be expressed in different ways depending on the market segment and charter form. In the crude tanker market, voyage freight is often quoted through Worldscale or as a percentage of Worldscale, which standardizes rates across routes and helps market participants compare relative freight levels. In other cases, especially products or special movements, freight may be quoted as a lump sum or in dollars per metric ton. Under time charters, the rate is usually daily hire. These different quotation methods can obscure comparability, so experienced charterers quickly translate them into common economic measures.

One of the most important derived measures is the time-charter equivalent, or TCE. This expresses voyage earnings in daily terms after accounting for voyage costs such as bunkers and port expenses. Owners use TCE to compare different trading opportunities. Charterers use the same logic, explicitly or implicitly, when deciding whether a quoted freight rate is attractive relative to route economics and vessel deployment alternatives.

But freight alone does not determine total shipping cost. Port costs, canal tolls, bunker consumption, ballast distance, waiting time, heating needs, tank-cleaning requirements, and terminal restrictions all matter. A vessel with a slightly higher headline freight rate may be more economical overall if it can load and discharge faster, avoid lightering, or reduce the risk of delay. This is why vessel selection is a commercial decision, not just a shipping department decision.

A crucial piece of the economics is laytime. Laytime is the amount of time contractually allowed for loading and discharging. If operations exceed that allowance and the delay is attributable to the charterer side under the charter terms, demurrage is usually payable. Demurrage is effectively liquidated compensation for use of the vessel beyond agreed time. Because tankers are expensive assets and port delays are common, demurrage exposure is a major part of freight economics.

Demurrage can arise from berth congestion, slow terminal pumping rates, cargo not being ready, documentation delays, weather within charter-party treatment, draft restrictions, tank inspection issues, shore-line problems, or many other causes depending on how risk is allocated in the charter. In some trades, expected demurrage is so common that market participants incorporate it into route economics. In others, avoiding it is a key source of competitive advantage.

Detention is related but distinct. In many commercial contexts, detention refers to compensation for delay not captured within the charter-party demurrage framework, or delay affecting equipment or logistics assets in a broader sense. The exact usage varies. What matters is that delay costs do not stop at the quoted freight rate. A cheap vessel on paper can become costly if the cargo system around it is slow or poorly coordinated.

Vessel selection, therefore, is about matching ship characteristics to cargo requirements and route economics. A charterer considers cargo size, port draft, berth dimensions, discharge restrictions, canal access, heating capability, coating, pump performance, age, vetting status, and likely repositioning cost. For a long-haul crude movement, a larger tanker may reduce cost per barrel dramatically—unless the discharge port cannot receive it, requiring ship-to-ship transfer or lightering that erodes the advantage. For a product cargo, a coated vessel with appropriate tank history may be essential even if a cheaper dirty tanker is notionally available. For a heavy fuel oil cargo, heating performance may matter more than speed.

Timing also matters. A ship available promptly in the right basin may be more valuable than a nominally cheaper ship that must ballast long distance or risks missing la`ycan. Likewise, freight procurement must take account of broader portfolio economics. A trader moving one cargo may choose differently from an integrated company optimizing several ships and several cargoes simultaneously.

The best freight buyers therefore think in terms of delivered economics, not freight in isolation. They ask which vessel produces the lowest expected total transport cost while preserving execution reliability. That includes rate, delay exposure, compatibility, and optionality. In volatile markets, it also includes a view on future freight direction: whether to fix now, wait, or use period cover.

This is the essential message of the chapter. Marine transportation is procured through a specialist charter market where capacity, time, and risk are bought in several different forms. The choice among voyage charters, time charters, bareboat structures, and COAs reflects a broader commercial strategy. Freight may be purchased through brokers, direct negotiation, or tenders, but in every case the headline rate is only the beginning of the analysis. What matters is the total cost and reliability of moving the cargo.

In oil shipping, freight is not simply a pass-through expense. It is a market variable, a source of operational risk, and often a source of competitive advantage. The companies that understand how to procure marine transportation well do not just “book ships.” They manage one of the most important economic levers in the movement of oil.