Tanker Chartering

Tanker Chartering

Tanker chartering is the specialist part of ship chartering concerned with the employment of ships designed to transport liquid cargoes. A tanker is not simply a dry cargo ship with tanks. Tankers are purpose-built ships with cargo tanks, pumping systems, pipelines, heating arrangements, inert gas systems, cargo monitoring equipment, safety procedures, and pollution-prevention equipment designed for liquid cargo operations. The tanker market therefore has its own terminology, charter-party forms, freight mechanism, operational risks, and commercial behaviour.

The main liquid cargoes carried by tankers include:

• Crude oil
• Refined oil products
• Chemicals
• Wine
• Vegetable oils and other food oils

Crude oil and refined oil tankers form the largest and most commercially visible parts of the tanker market. The expression "tanker trades" is commonly used to describe the movement of crude oil and petroleum products by sea. These trades are central to the world economy because oil remains a critical input for transport, industry, petrochemicals, power generation, heating, and manufacturing. As a result, tanker chartering is strongly influenced by energy demand, refinery location, oil prices, geopolitics, environmental regulation, and the availability of suitable tonnage.

Like other shipping sectors, the tanker market experienced a powerful boom between 2002 and 2008. Freight rates and asset values increased rapidly as oil demand expanded, global trade grew, and tanker utilisation tightened. During that period, tanker shipping attracted greater attention from banks, public investors, private equity, and capital markets. However, strong markets encouraged heavy ordering. After the financial crisis of 2008, the arrival of large numbers of newbuilding tankers placed downward pressure on freight rates and weakened the earnings environment for many owners.

Tanker chartering remains one of the most volatile areas of shipping. Freight rates can rise sharply when tanker supply is tight, when oil demand increases, when voyage distances lengthen, or when political events disturb energy flows. Conversely, rates can weaken quickly when cargo volumes fall, when refinery demand slows, when new ships enter the market, or when oil companies reduce activity. This combination of strategic cargo, specialised ships, and highly visible freight indices makes tanker chartering both commercially attractive and risk-sensitive.

Main reasons to learn more about tanker trades and tanker chartering:

• Tanker shipping has become more specialised since the 1970s. Different tanker designs are now used for crude oil, clean products, dirty products, chemicals, edible oils, and other liquid cargoes.
• The size of the tanker fleet has expanded enormously over time, especially during periods of high oil demand and strong freight earnings.
• Oil trades have grown substantially, but not evenly. The geography of production, refining, and consumption has shifted, changing voyage patterns and tonne-mile demand.
• Quality, safety, vetting, and environmental compliance have become decisive factors in tanker employment, particularly after major oil pollution incidents such as MT Exxon Valdez in 1989.
• Politics has a major influence on tanker chartering because oil is a strategic commodity. Wars, sanctions, embargoes, canal restrictions, regional conflict, and energy-security concerns can move tanker freight rates very quickly.

Tanker Market

The tanker market is highly competitive, but it is also highly segmented. Crude carriers, product tankers, chemical tankers, shuttle tankers, parcel tankers, and specialised food-grade tankers do not always compete directly with one another. Even within crude and product tanker markets, size, coating, heating capability, pump capacity, ice class, age, approvals, flag, and trading history may determine whether a ship is acceptable for a particular cargo.

Historically, the tanker market has been more volatile than many dry cargo trades because oil is both a commodity and a strategic resource. A refinery cannot easily replace crude oil supply with another raw material. A country cannot immediately replace oil imports if a major supply route is disrupted. This makes tanker demand sensitive to political events and energy-market shocks. At the same time, short-term tanker supply is limited by the number of ships already afloat, their location, their employment status, and their approval by oil majors.

Although large oil companies once controlled much of the tanker fleet through ownership and long-term charters, the market has become more fragmented. Independent tanker owners, publicly listed companies, state-linked interests, traders, national oil companies, and commodity houses now play important roles. This has increased competition and made spot-market information more important.

Seaborne Oil Trade

Oil trades are normally divided into two major categories:

• Unrefined Oil (Crude Oil)
• Refined Oil (Oil Products)

Crude oil is produced from oil fields and transported either by pipeline or tanker to refineries. Refined oil products are produced after crude oil is processed at a refinery. The resulting products may include:

• Naphtha
• Diesel Oil
• Heating Oil
• Kerosene
• Fuel oil
• Gasoline (Petrol)

Different crude oils yield different proportions of light, middle, and heavy products. Some crude oils are sweet, meaning they contain relatively low sulphur. Others are sour and require more complex refining. Refinery configuration therefore affects crude oil selection, product output, and tanker demand. A refinery designed to process heavier crude may not demand the same crude supply as a refinery designed for lighter crude. This technical reality has a direct impact on tanker chartering because cargo origin, cargo quality, and refinery destination all shape fixture patterns.

Some refined products are more volatile and flammable than crude oil, while heavier products such as bitumen or heavy fuel oil may require heating to remain pumpable. Product tankers therefore need suitable coatings, segregation arrangements, pumps, cleaning standards, and cargo-handling procedures. Chemical and edible oil tankers require even higher cargo-care standards because contamination can make cargo worthless or unsafe.

There are two (2) types of tanker trades:

• Transporting crude oil from producing regions to international refineries
• Transporting refined oil products from refineries to consuming markets

The balance between these trades depends heavily on refinery location. In the 1950s and 1960s, many refineries were built near final consumer markets in North America and Western Europe. This was partly political, because consumer countries wanted strategic control over refining, and partly economic, because crude oil could be carried cheaply in very large tankers. As a result, crude oil long-haul trades became dominant.

Over time, refining capacity expanded in the Middle East, India, China, and other Asian locations. This altered trade flows. Some oil-producing regions no longer exported only crude oil; they also exported refined products. Some consuming regions reduced refinery capacity and became more dependent on imported products. These changes increased product tanker tonne-miles and created new employment patterns for clean product tankers.

Main Developments in Seaborne Oil Trades

The growth of tanker shipping is closely linked to the growth of world oil production and consumption. In 1914, tankers represented only a small part of the world fleet. By 1938, tankers had become much more important, and by the late twentieth century the tanker fleet had become one of the largest segments of commercial shipping. In DWT (Deadweight Tonnage) terms, tanker capacity expanded dramatically as crude oil production, refining, and international trade increased.

World oil output rose strongly through the twentieth century. The early post-war period brought industrial expansion, motorisation, aviation growth, petrochemical demand, and rising energy consumption. Oil became the dominant fuel for many economies. This created a powerful expansion in crude oil tanker demand and encouraged the construction of larger ships.

Oil production growth has never been steady. The period from the late 1930s to the late 1950s saw very rapid expansion. Growth continued into the 1970s, but the oil price shocks of the 1970s and early 1980s altered consumption patterns. Higher prices encouraged energy conservation, alternative fuels, smaller cars, efficiency improvements, and reduced oil intensity in many developed economies. Tanker demand weakened sharply when oil consumption slowed.

From the 1990s onward, oil demand recovered and shifted toward Asia. China’s industrialisation, India’s growth, rising transport demand, expanding petrochemical use, and continued consumption in North America and the Middle East supported seaborne oil trade. However, demand growth became more geographically uneven. Mature economies became more efficient, while emerging economies increased their share of consumption.

Oil production and consumption are the basic indicators of potential tanker demand, but they do not tell the full story. The tanker market depends not only on the number of tonnes moved but also on the distance those tonnes travel. This is why tonne-mile demand is central to tanker-market analysis.

Tanker Tonne-Miles

Tanker demand is commonly measured in tonne-miles. A tonne-mile combines cargo volume with distance. Moving one tonne of crude oil 1,000 nautical miles creates far less demand for ship capacity than moving the same tonne 10,000 nautical miles. Therefore, a change in trade distance can alter tanker demand even when total oil production remains stable.

The closure of the Suez Canal in 1967 is one of the clearest historical examples. Tankers trading between the Middle East and Europe could no longer use the short route through the canal and had to sail around the Cape of Good Hope (COGH). Cargo tonnage increased, but tonne-miles increased even more because voyage distances became much longer. This encouraged the development of very large crude carriers and ultra-large crude carriers, because bigger tankers could reduce unit transport costs on long-haul routes.

When the Suez Canal reopened in 1975, average voyage distances declined. A shorter route reduced tonne-mile demand even if oil cargo volumes remained significant. Between the late 1970s and late 1980s, tanker demand weakened because both volumes and voyage distances changed unfavourably. This created severe market pressure, high lay-ups, and weak freight rates.

Since then, average tanker voyage lengths have fluctuated according to the balance between long-haul and short-haul trades. Middle East to Asia, Atlantic Basin to Asia, West Africa to Asia, Russia-related flows, United States exports, and refinery-location changes all affect tonne-mile demand. A cargo diverted from a nearby refinery to a distant buyer can create additional tanker demand even if the cargo quantity is unchanged.

Oil Consumption and Oil Production

The Middle East remains one of the most important oil-exporting regions. Its share of world oil production has fluctuated over time because of OPEC policy, wars, sanctions, investment cycles, non-OPEC production, shale oil growth, and demand changes. However, the region continues to be central to crude oil tanker employment because it exports large volumes to Asia and other markets.

In earlier decades, the United States and Western Europe were dominant oil-consuming regions. The United States produced substantial oil but still required imports because domestic consumption was very high. Western Europe had large consumption and comparatively limited production, making it heavily dependent on imports. The Middle East consumed relatively little oil compared with its production and therefore became a major export region.

Asia’s role has changed dramatically. Asian oil consumption expanded as China, India, Southeast Asia, and other economies industrialised. Much of Asia lacks enough domestic crude oil to satisfy demand, so imports became essential. This shift increased the importance of Middle East to Asia routes and supported demand for large crude carriers.

Major crude oil exporting areas include the Middle East, former Soviet Union countries, West Africa, South and Central America, Canada, and other producing regions. Major importers include China, India, Japan, Europe, and other industrial or refining centres. Refined product exports are also important from the United States, the Middle East, India, and other refining hubs.

The location of refinery capacity is crucial. If crude oil is exported to a distant refinery, crude tanker demand rises. If the producing region refines the crude and exports products instead, product tanker demand may rise. This is why closures of refineries in Europe and Australia and expansion of refineries in the Arabian Gulf and India have influenced product tanker tonne-miles.

Crude Oil Price

Crude oil prices have a powerful influence on tanker markets, although the relationship is not always direct. Higher oil prices may reduce consumption over time, encourage energy efficiency, and alter inventory behaviour. Lower oil prices may stimulate consumption, encourage stockbuilding, and increase trading activity. However, tanker freight rates also depend on ship supply, voyage distance, storage demand, refinery margins, and geopolitical events.

From the 1960s into the 1970s, crude oil prices rose sharply. Arabian Light crude averaged around USD 2 per barrel during much of the 1960s. OPEC (Organization of the Petroleum Exporting Countries) then gained greater control over posted prices and supply policy. In 1970, prices rose, and after the 1973 Arab-Israeli War, oil prices increased dramatically. The oil price shock created major consequences for importing countries, including balance-of-payments pressure, inflation, recession, and reduced oil consumption growth.

The 1973 price shock also interrupted the tanker boom. Before the shock, rising oil demand and long-haul crude movement had encouraged tanker ordering. When demand slowed, the tanker fleet became too large for the available cargoes. Owners faced weak freight rates, lay-ups, scrapping, and financial distress. This demonstrated a recurring tanker-market problem: ship supply responds slowly, but demand can change quickly.

Another major oil price shock followed the Iranian Revolution in 1979. Oil prices rose again, and the world economy adjusted through reduced consumption, efficiency gains, and slower growth. By the mid-1980s, non-OPEC production had increased, OPEC discipline weakened, and Saudi Arabia changed pricing strategy. Oil prices fell, affecting tanker demand and trading patterns.

In 1990, Iraq’s invasion of Kuwait caused another oil price spike, but the effect was short-lived because additional production from other producers helped compensate for lost supply. After 2002, oil prices rose strongly as demand from China and other emerging markets expanded and supply remained tight. In 2008, prices reached very high levels before falling sharply during the global financial crisis. Later, prices recovered, but shale oil growth in the United States, slower economic growth, and OPEC production strategy contributed to another major price decline by 2014-2015.

OPEC (Organization of Petroleum Exporting Countries)

OPEC (Organization of Petroleum Exporting Countries) has played a major role in crude oil pricing and tanker-market conditions. In the early 1970s, OPEC's ability to coordinate supply and influence prices caused major changes in the global oil economy. By agreeing production policies and pricing positions, OPEC members could affect the availability and price of crude oil.

However, OPEC’s market power has varied over time. Some members exceeded quotas. Non-OPEC producers increased output. New producing areas developed. Later, shale oil growth in the United States changed the supply picture. OPEC’s policy became more flexible and more focused on balancing market share, price stability, and long-term influence.

For tanker chartering, OPEC matters because production decisions affect export volumes. If OPEC cuts production, crude tanker cargoes may decrease. If OPEC increases production, cargo availability may rise. The impact is strongest on routes connected with Middle Eastern exports and on crude tanker segments such as VLCCs and Suezmaxes.

World Tanker Fleet

The world tanker fleet expanded rapidly during the post-war oil boom and reached a very large share of total world shipping tonnage by 1980. After that, the growth trend reversed as oil demand slowed and excess tanker capacity became obvious. The tanker fleet then adjusted through lay-up, scrapping, reduced ordering, and eventually renewed growth when demand recovered.

The tanker supply cycle is slow. When freight rates are high, owners order new ships. Those ships are delivered years later, sometimes after the market has already weakened. This delayed response can create oversupply. When freight rates are low, owners stop ordering, scrap older tonnage, and sometimes lay up ships. Eventually, demand catches up with supply and rates recover. This cycle is familiar across shipping, but the tanker sector often experiences it sharply because large crude tankers are expensive and have limited alternative employment.

Tanker supply also depends on regulatory change. The phase-out of single-hull tankers after major pollution incidents reshaped the fleet. Double-hull requirements forced renewal and accelerated scrapping of older ships. Regulatory changes can therefore reduce or redirect supply independently of ordinary market forces.

In tanker shipping business, WORLDSCALE (WS) is the standard rate system used for many tanker fixtures. Worldscale provides a nominal flat rate for a tanker voyage on a particular route, calculated by reference to assumed ship size, costs, port charges, bunker assumptions, and route details. A fixture is then quoted as a percentage of the Worldscale rate. For example, WS 100 means the flat rate, WS 150 means 150% of the flat rate, and WS 75 means 75% of the flat rate.

WORLDSCALE (WS) allows the tanker market to compare routes and fixtures more easily. Instead of quoting every voyage only as a lump sum or dollars per tonne, market participants can express freight relative to an established benchmark. This is particularly useful in spot tanker chartering, where rates change quickly and brokers need a common language.

Tanker and Dry Cargo Markets

In the short run, tanker and dry cargo markets behave as separate sectors. A crude oil tanker cannot simply carry iron ore, and a bulk carrier cannot carry crude oil. The ships, cargo systems, safety rules, and chartering practices are different. However, in the long run, dry cargo and tanker markets are connected through shipbuilding capacity, capital allocation, secondhand values, credit markets, and global economic activity.

When the world economy is strong, demand for energy, raw materials, and manufactured goods often rises together. This can create favourable conditions for both tankers and dry bulk carriers. China’s industrial expansion is a good example. It increased demand for oil, iron ore, coal, and other commodities, supporting both tanker and dry bulk freight markets.

Shipbuilding capacity also links the sectors. If shipyards are full of tanker orders, fewer slots may be available for bulk carriers. If dry bulk orders dominate yard capacity, tanker supply growth may be slower. When freight rates are high in both markets, owners compete for shipyard space, pushing up newbuilding prices.

Despite these long-term links, tanker freight rates are often more volatile than dry bulk rates. Oil-related demand shocks, political risk, cargo concentration, and large ship sizes contribute to higher rate swings.

Structure of Tanker Markets

In the 1960s, the oil industry was dominated by major integrated oil companies such as Exxon, Gulf, Shell, Chevron, Texaco, BP and Mobil. These companies controlled a large part of tanker tonnage through direct ownership and long-term charters. At first glance, this structure appeared oligopolistic because a few large oil companies controlled both cargoes and ships.

However, tanker shipping remained competitive because there were still many independent owners, independent oil companies, and spot cargo requirements. Over time, the market became more fragmented. National oil companies grew in importance. Independent traders expanded. The spot oil market developed. Oil cargoes could change hands several times before reaching final destination. This increased the number of Charterers and reduced the dominance of traditional oil majors.

Oil majors also reduced direct tanker ownership and long-term charter exposure. One reason was market oversupply. Another was liability concern, especially after pollution legislation such as the Oil Pollution Act 1990 (OPA90). Owning ships exposed oil companies directly to maritime operational and pollution risks. Many preferred to charter ships from independent owners while imposing strict vetting and approval standards.

Today, tanker ownership is spread among independent Shipowners, public tanker companies, private groups, state-linked owners, and specialist operators. This fragmentation supports competitive chartering. No single owner or Charterer normally controls enough tonnage to dictate market rates across the whole sector.

Number of Shipowners and Charterers

The number of market participants is one of the reasons tanker chartering can be analysed as a competitive market. There are many Shipowners offering tonnage and many Charterers requiring transport. Charterers include oil majors, national oil companies, refiners, traders, commodity houses, and product distributors. Shipowners include large public companies, private groups, family-owned companies, state-linked fleets, and specialist tanker operators.

The development of the spot oil market increased the number of potential Charterers. Oil cargoes are frequently traded, blended, resold, stored, or redirected. A cargo may begin under one commercial plan and later be nominated to a different receiver or discharge range. This creates demand for flexible tanker chartering and supports a liquid spot market.

Although oil-major approval remains important, particularly for quality-sensitive trades, the tanker market is no longer dominated by a small group of vertically integrated oil companies. Instead, market information, vetting, finance, and fleet quality determine which ships are acceptable and competitive.

Homogeneous Product

Oil itself is not completely homogeneous. Crude oils differ in sulphur content, viscosity, density, acidity, contaminants, and refinery yield. Refined products also differ by grade, specification, flash point, sulphur level, and contamination sensitivity. However, the transportation service supplied by tankers can be treated as relatively homogeneous within a given segment where ships meet the necessary technical and vetting requirements.

For example, one approved MR product tanker may compete directly with another approved MR tanker for a clean product cargo if both have suitable tanks, coatings, pumps, trading approvals, and laycan availability. Similarly, one VLCC may compete with another VLCC for a Middle East to Asia crude cargo if both satisfy charterer requirements.

This does not mean quality is irrelevant. Oil companies and traders may reject ships because of age, inspection history, detention record, ownership concerns, management quality, crew competence, or prior incidents. Tanker service is homogeneous only after minimum technical and quality standards are met.

Free Entry and Exit

Entry into the tanker market depends mainly on access to capital and the ability to buy or build suitable ships. A new tanker requires substantial investment, and financing conditions strongly influence ordering activity. When freight rates are high and asset values are rising, banks and investors are more willing to finance new ships. When markets are weak, credit becomes harder to obtain and owners become more cautious.

Shipping investment often follows the cycle too late. Owners order during strong markets, but by the time the ships are delivered, supply may exceed demand. This creates the familiar shipping cycle of boom, ordering, oversupply, weak rates, scrapping, and recovery.

Exit is relatively easy compared with many land-based industries because ships are mobile assets. A Shipowner may sell a tanker in the secondhand market or scrap the ship. However, selling a ship to another owner does not remove capacity from the market. Only demolition, conversion, or permanent withdrawal reduces supply. In a very poor market, the secondhand value may fall sharply, making exit costly.

Lay-up is another form of temporary exit, but tanker lay-up is not always attractive. Oil-company vetting and approval systems can make it difficult for a tanker to return quickly after lay-up. Owners may prefer slow steaming, floating storage employment, or low-paying fixtures rather than risk losing approvals and market acceptance.

Full Information

The tanker market is well served by specialised shipbrokers, market reports, freight indices, fixture reports, oil-trading information, port data, and publicly available company disclosures. Shipbrokers maintain continuous contact with Shipowners and Charterers across time zones. London has historically played an important role because it can communicate with Asian and American markets within the same trading day.

Many tanker fixtures are reported with key details such as ship name, Charterer, cargo size, load area, discharge range, laycan, and rate. Although not every fixture is publicly disclosed, the market generally has strong information flow. This supports price discovery and makes tanker chartering more transparent than many other commodity transport markets.

Publicly listed tanker companies also improve information availability because they publish financial statements, fleet details, market commentary, and investor presentations. This helps analysts observe earnings, asset values, leverage, orderbooks, and fleet strategies.

Because there are many buyers and sellers, active brokers, mobile assets, standard freight benchmarks, and frequent fixtures, the tanker market contains many characteristics of a competitive market. Supply-and-demand analysis is therefore a useful way to understand tanker freight-rate behaviour.

Tanker Sub-segments

The tanker market is not a single uniform market. Different tanker sizes and types form sub-segments with their own supply-demand balance, freight behaviour, and commercial logic. The main crude tanker segments include VLCC, Suezmax, Aframax, and smaller crude carriers. Product tanker segments include LR2, LR1, MR, and smaller product tankers. Chemical tankers and parcel tankers form more specialised markets.

Each segment has different freight-rate volatility and different demand drivers. VLCCs are heavily exposed to long-haul crude trades, especially Middle East to Asia and Atlantic Basin to Asia routes. Suezmaxes are more flexible and can serve West Africa, Mediterranean, Black Sea, North Sea, and other crude trades. Aframaxes are often used in regional crude movements, lightering, short-haul trades, and ice-class or restricted-port employment. Product tankers are driven by refinery location, clean product demand, arbitrage flows, and product imbalances.

Sub-segments can become disconnected in the short run. VLCC rates may be weak while MR product tanker rates are strong, or clean product tankers may benefit from refinery disruption while crude carriers remain oversupplied. However, in the long run, capital moves between segments. If one segment produces better returns, owners may order or buy ships in that segment, eventually increasing supply and reducing the advantage.

Free entry and exit therefore link tanker sub-segments over time. Market imbalances may persist for several years, but ordering, scrapping, conversion, and asset purchases gradually adjust supply.

Modelling Tanker Demand

Tanker demand is derived demand. Charterers do not normally demand tanker transport for its own sake. They demand it because crude oil or refined products must move from a place of supply to a place of consumption, storage, refining, or trading opportunity. Therefore, tanker demand depends on oil production, oil consumption, refinery throughput, product demand, inventory movements, arbitrage economics, and voyage distance.

The freight-rate elasticity of tanker demand is usually low in the short run. If a refinery needs crude oil and there is no practical pipeline alternative, the cargo must move by sea even if freight rates rise. Freight is often a small part of the final retail price of oil products, especially after refining margins, taxes, distribution costs, and retail margins are included.

The elasticity of derived tanker demand depends on:

• The final product's own-price elasticity of demand
• Cross Price Elasticity: whether other transport modes or energy sources can substitute the sea movement
• Share of freight costs in the delivered cost of oil or oil products
• Elasticity of tanker supply

Oil demand is relatively inelastic in the short run because consumers and industries cannot quickly replace oil-based transport, petrochemical feedstocks, aviation fuel, diesel, gasoline, or heating fuels. Over a longer period, substitution is more possible through energy efficiency, electric vehicles, alternative fuels, public policy, and industrial change. But tanker freight-rate changes alone usually do not immediately reduce oil consumption.

This means tanker demand can be drawn as almost vertical for a given level of economic activity. If the global economy grows, the demand curve shifts outward. If recession occurs, the demand curve shifts inward. Small changes in demand can produce large freight-rate changes when the fleet is highly utilised.

Modelling Tanker Supply

The tanker supply curve is more elastic when many ships are idle, waiting, slow steaming, or laid up. In such conditions, additional cargo demand can be met without a large rate increase because unused tonnage can return to work. When the fleet is already highly employed, short-term supply becomes much less elastic. Rates may then rise sharply because no immediate new ship capacity is available.

Short-term tanker supply can be adjusted through speed, ballast positioning, waiting time, storage employment, lay-up reactivation, and cargo scheduling. Owners may increase speed when rates are high and slow steam when rates are weak. Slow steaming reduces effective supply because each voyage takes longer. Floating storage also removes ships from the active transport market, tightening availability.

Newbuilding deliveries are the main long-term supply response, but they require years between ordering and delivery. Scrapping is the main permanent supply reduction. Older tankers may be demolished when rates are low, steel prices are attractive, or regulatory requirements make further trading uneconomic.

At high fleet utilisation, tanker supply becomes almost fixed in the short run. This explains why tanker freight rates can spike suddenly during geopolitical disruptions, winter demand surges, canal restrictions, sanctions, or large inventory movements.

Tanker Market Model

A tanker market model combines inelastic short-run demand with a supply curve that becomes steep at high utilisation. When demand is moderate and many ships are available, freight rates may remain low. When demand increases and spare capacity disappears, rates can rise very quickly. When full utilisation is reached, higher freight rates cannot immediately create new ships, so rates may become extremely volatile.

This model explains why tanker markets can move from weak to very strong in a short period. It also explains why strong spot rates may not last if new ships are delivered or if cargo demand weakens. The market is competitive, but competition does not prevent volatility when capacity is tight.

The same general model can be applied to dry bulk markets, but tanker markets often experience sharper swings because oil flows are more politically sensitive, ship sizes are larger, and cargo substitution is more limited.

Dry Cargo and Tanker Market Rate Volatility

Tanker freight-rate volatility is usually higher than dry bulk volatility for several reasons. First, dry cargo ships can shift among many bulk commodities. A bulk carrier may move coal, grain, bauxite, fertilizers, minor bulks, or other dry cargoes depending on suitability. This gives the dry cargo sector some internal flexibility. Tankers are more specialised and cannot easily move into unrelated cargoes.

Second, crude tankers are often larger than dry bulk carriers. Larger ship segments tend to experience greater earnings volatility because a smaller number of ships and cargoes can influence the balance more sharply. VLCC markets can move quickly when a few major charterers or export programmes change activity.

Third, oil is strategically important. Oil is vital for transport, petrochemicals, industrial activity, and energy security. Major export regions, especially the Middle East, have often been affected by war, sanctions, and geopolitical tension. Historical tanker freight-rate spikes have been associated with events such as:

• 1956 Suez Canal closed
• 1967 Six-Day War
• 1973 Yom Kippur War
• 1979-1984 Iran-Iraq war
• 1990 Iraq-Kuwait war

Fourth, market expectations can amplify movements. If market participants expect future rates to rise, Charterers may rush to fix ships, owners may hold back tonnage, and asset buyers may bid higher for secondhand tankers. This can create self-reinforcing price movement, at least temporarily. When expectations change, the correction can also be sharp.

After 2000, tanker-market strength was driven more by fundamentals such as Asian demand growth, refinery constraints, and high utilisation than by a single war event. However, geopolitical risk remains a major influence because oil supply routes and tanker employment are exposed to strategic disruption.

Tanker Freight Rate Fluctuations

Tanker freight rates have historically peaked during years associated with political conflict, canal disruption, oil supply disturbance, or unusual demand strength. Seasonal patterns also matter. In the Northern Hemisphere winter, demand for heating oil, diesel, and crude refining may increase, supporting tanker employment. Weather delays can also reduce effective supply by slowing port operations and voyages.

After 2000, strong oil demand from China and other Far East economies kept the tanker fleet heavily employed until the 2008 financial crisis. When the crisis reduced economic activity, tanker rates fell sharply. Some tankers then found employment as floating storage because contango in oil prices made it profitable to store oil at sea. Floating storage helped absorb tonnage temporarily, but it did not solve structural oversupply.

Owners often prefer slow steaming rather than lay-up during weak markets. Slow steaming reduces fuel consumption and absorbs supply while helping preserve oil-company approvals. Laying up a tanker may save operating costs, but it can create reactivation, vetting, and acceptance problems.

Changes in refinery geography have also affected tanker freight. Refinery closures in Europe and Australia reduced some local crude demand, while new refineries in the Arabian Gulf, India, and Asia increased product exports. United States shale growth changed crude and product flows, reducing some traditional crude imports while increasing product exports and, later, crude export activity after restrictions were relaxed.

Oil Pollution Act 1990

The Oil Pollution Act 1990 was enacted by the United States following the MT Exxon Valdez casualty in Alaska in 1989. OPA90 imposed strict pollution-related requirements and accelerated the movement toward double-hull tankers for ships trading to United States waters. The United States approach had global effects because owners who wanted access to the United States market had to comply.

The IMO later advanced the international phase-out of single-hull tankers, and the European Union pushed for accelerated withdrawal after the MT Erika casualty in 1999. These changes transformed the tanker sector. Older single-hull ships were gradually removed, and double-hull tankers became the standard for oil transportation.

The renewal programme improved safety and reduced the risk of oil pollution from collisions and groundings. It also changed fleet supply because older ships were scrapped earlier than they might have been under purely commercial conditions. Environmental regulation therefore became a direct driver of tanker supply, asset values, and chartering suitability.

Other safety and quality initiatives also reshaped tanker chartering. The International Safety Management Code (ISM Code), introduced in the late 1990s, changed management culture and formalised safety management systems. Port State Control inspections became more influential. The International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW) improved crew qualification standards. Oil-major vetting systems increased scrutiny of ship condition, management quality, incident history, and crew competence.

Today, a tanker’s commercial value depends not only on age, size, and freight market conditions but also on vetting acceptability, inspection record, environmental compliance, cargo-handling capability, emissions performance, and management reputation. A tanker that cannot pass charterer approval may be commercially restricted even if she is technically available.

Commercial Features of Tanker Chartering

Tanker chartering differs from dry cargo chartering in several practical ways. Cargoes are pumped rather than lifted. Loading and discharging depend on shore tanks, terminal lines, pumps, vapour controls, sampling, heating, tank preparation, and safety checks. The ship's suitability depends on tank cleanliness, previous cargoes, coatings, segregation, cargo pumps, heating coils, manifold arrangements, and terminal compatibility.

Tanker Charter Parties commonly include detailed clauses on laytime, demurrage, pumping warranties, Notice of Readiness, shifting, lightering, cargo temperature, cargo quantity, contamination, vapour emissions, inert gas, closed loading, safety regulations, sanctions, and pollution liabilities. The commercial negotiation is therefore both freight-based and technically detailed.

The tanker market uses both voyage charter and time charter structures. Voyage charters are common in spot trades, where the Shipowner earns freight for carrying a cargo between agreed loading and discharging places. Time charters are used where the Charterer wants control of the ship for a period. Contract of affreightment arrangements may also be used where the parties agree to move a programme of cargoes over time without necessarily naming one specific ship for every shipment at the outset.

Clean and dirty trades are also distinguished. Clean product tankers carry refined products such as gasoline, diesel, jet fuel, naphtha, and similar cargoes. Dirty tankers carry crude oil or heavier products such as fuel oil. A ship moving from dirty to clean employment may require extensive cleaning and may not be commercially practical. Tank coatings and cargo history are therefore important in product tanker chartering.

Quality, Vetting, and Approvals in Tanker Chartering

Quality control is central to tanker chartering. Oil majors and major traders usually require ships to pass vetting inspections before acceptance. Vetting does not simply ask whether the ship is classed and certified. It examines management standards, inspection history, crew competence, safety culture, cargo systems, pollution-prevention equipment, machinery condition, navigation procedures, and incident record.

Vetting creates a commercial barrier to employment. A ship may be legally seaworthy and classed but still unacceptable to a particular Charterer. If the ship is rejected by major oil companies, her employment prospects may be reduced. This is why owners invest heavily in maintenance, crew training, inspection preparation, and management systems.

The approval regime also affects lay-up decisions. A laid-up tanker may lose momentum in inspection history and charterer confidence. Reactivation may require inspections, repairs, crew familiarisation, and renewed approvals. Owners therefore often avoid lay-up unless the market is extremely weak.

In tanker chartering, reputation matters. A Shipowner with strong safety performance and reliable operation may achieve better employment opportunities. A Shipowner with repeated incidents, detentions, cargo claims, or inspection failures may face discounts or rejection.

Summary

Tanker Chartering is the specialist market for ships built to transport liquid cargoes, including crude oil, refined oil products, chemicals, wine, vegetable oils, and other food oils. The largest segments are Crude oil and refined oil tankers, which together form the core tanker trades.

The tanker market is shaped by oil production, oil consumption, refinery location, voyage distance, tanker supply, shipbuilding cycles, OPEC policy, oil prices, geopolitical events, and environmental regulation. Tonne-mile demand is essential because longer voyage distances can increase tanker demand even if cargo volume remains unchanged.

In tanker shipping business, WORLDSCALE (WS) provides a standard freight-rate reference system. Tanker fixtures are often quoted as a percentage of the Worldscale flat rate for the route. This allows market participants to compare fixtures and rate movements more easily.

The tanker market has many features of a competitive market: many Shipowners, many Charterers, extensive information flow, relatively homogeneous transport service within segments, and mobile assets. However, tanker sub-segments behave differently. VLCC, Suezmax, Aframax, LR2, LR1, MR, and chemical tanker markets may have different short-run conditions even though long-term capital flows connect them.

Tanker demand is derived from the need to move oil and oil products. It is generally freight-rate inelastic in the short run because oil transport by sea has few immediate substitutes and freight is often a small part of the final delivered cost. Tanker supply is elastic when ships are idle, but becomes very inelastic when the fleet is fully employed. This explains why tanker freight rates can rise sharply in tight markets.

Political events have historically had a major effect on tanker rates, including the 1956 Suez Canal closure, the 1967 Six-Day War, the 1973 Yom Kippur War, the 1979-1984 Iran-Iraq war, and the 1990 Iraq-Kuwait war. Market expectations can amplify these movements because Charterers, Shipowners, investors, and traders react quickly to anticipated future earnings.

The Oil Pollution Act 1990, the phase-out of single-hull tankers, the ISM Code, Port State Control, STCW standards, and oil-major vetting have transformed tanker chartering. Today, quality, safety, environmental compliance, and approval history are as important as ship size and freight rate. A tanker must not only be available; she must also be acceptable to Charterers, terminals, regulators, insurers, and the wider market.