Transporting Oil

Five Methods of Moving Oil

Oil reaches consumers through five transportation methods: tanker ship, pipeline, tank truck, railcar, and (rarely) aircraft. Each serves a different segment of the supply chain. Tanker ships move crude and products across oceans. Pipelines carry oil over land between production sites, refineries, and distribution hubs. Tank trucks handle the final mile to gas stations, homes, and farms. Railcars carry crude, products, and chemicals where pipelines are absent. Aircraft tankering is limited to airlines ferrying jet fuel between their own hubs when regional prices make it economic.

Transportation matters because producing basins and consuming markets are rarely in the same place. Saudi crude has to reach refineries in Japan and Rotterdam. Canadian bitumen has to reach the US Gulf Coast. Gasoline made on the US Gulf Coast has to reach drivers in New York and Atlanta. Every mile of that journey passes through a regulated, standardized, capacity-constrained network, and the spread between producing and consuming regions reflects the cost and scarcity of that network.

Tanker Ships

Just over half of global crude production travels by sea at some stage. The tanker fleet is segmented by deadweight tonnage (DWT) into size classes that determine which terminals, canals, and trades the vessel can serve. The table below is the reference ladder.

"Aframax" sounds like a brand but is short for Average Freight Rate Assessment Maximum, from the AFRA scale the London Tanker Brokers' Panel used decades ago to classify freight contracts. The name stuck. A VLCC carries roughly 2 million barrels of crude; a single VLCC cargo moving from Ras Tanura to Ningbo can swing a weekly Chinese inventory print. Suezmaxes fit through the Suez Canal fully loaded. VLCCs fit only partially loaded and must reload the balance on the other side, or reroute around the Cape of Good Hope.

Clean product tankers carry refined products such as gasoline, diesel, and jet fuel in coated or stainless steel tanks that will not contaminate the cargo. Dirty tankers carry crude oil and residual fuel. The distinction matters commercially: switching a vessel between clean and dirty service requires an expensive tank clean and is rarely done. A typical tanker has segregated cargo tanks, segregated ballast tanks to maintain trim when empty, slop tanks to hold tank washings, a pump room forward of the engine room, and an accommodation block aft. OPA 90, passed after the 1989 Exxon Valdez grounding in Prince William Sound, required all tankers calling on US waters to be double-hulled. The IMO followed with a global MARPOL schedule that phased out single-hulled tankers by 2015.

A rough conversion: multiply DWT by 7.5 to estimate barrel capacity. A "boatload" in trading slang is 500,000 barrels, the cargo of a typical MR or LR1. A "bargeload" is 50,000 barrels. A VLCC cargo is often quoted as "a million barrels plus" with the exact figure set by the loadline at the terminal.

Chartering and Worldscale

Tanker freight is priced using the Worldscale system, annually revised nominal rates published in dollars per metric tonne for a list of standard voyages. Worldscale 100 is set so a standard reference vessel earns a specified daily return on that route. Market charter rates are quoted as a percentage of that nominal: WS 100 equals the nominal, WS 150 is 50% above, WS 80 is 20% below. Brokers quote a single number instead of rebuilding the bunker and port cost stack for every voyage. The Baltic Exchange publishes daily route assessments that serve as the reference for freight derivatives (FFA).

Pipelines

All oil passes through a pipeline at some stage. Black oil pipelines carry crude to refineries. Clean product pipelines move refined fuels from refineries to distribution terminals. The Colonial Pipeline, 5,500 miles from Houston to Linden, New Jersey, moves roughly 40% of US East Coast liquid fuels. Products travel at 3 to 5 mph, with a full journey taking 18 to 20 days.

A few pipeline mechanics are worth understanding. Batching is the practice of pumping different products back to back through the same pipe: a batch of jet fuel, then a batch of diesel, then a batch of gasoline. A small interface zone at each boundary mixes slightly; the interface cut is either rerun through a refinery or downgraded to a less sensitive product. Pigs are pipeline inspection gauges that travel with the fluid to clean wall deposits, separate batches, or, in the case of "smart pigs", take ultrasonic readings of wall thickness to detect corrosion before it becomes a leak. Drag reducing agent (DRA) is a tiny dose of high molecular weight polymer that suppresses turbulent eddies at the pipe wall and can lift throughput 10% to 40% without new pumps. Pump stations sit every 50 to 100 miles to restore pressure lost to friction.

Crude by Rail and the Bakken Boom

Between 2011 and 2015 the US ran a short, intense boom in crude by rail (CBR) as Bakken shale production outgrew pipeline capacity. At the peak, over a million barrels per day of North Dakota light sweet crude moved in unit trains to refineries on the East Coast, West Coast, and Gulf. The boom ended on July 6, 2013, when an unattended runaway train of 72 tank cars carrying Bakken crude derailed and exploded in the center of Lac-Megantic, Quebec, killing 47 people and leveling downtown. The accident forced the phase-out of the old DOT-111 tank car design and the adoption of the thicker-walled, pressure-tested DOT-117 standard. CBR volumes fell as new pipelines came online, but rail remains meaningful for Canadian heavy oil moving to the Gulf, especially when TMX and Enbridge Mainline are apportioned.

Trucking: The Last Mile

Tank trucks deliver the last mile of almost every refined product. Gasoline tankers fan out from terminals to service stations several times a day. Aviation fuel trucks or hydrant-cart systems fuel aircraft on airport aprons. Heating oil trucks fill residential tanks in the US Northeast. Asphalt trucks haul hot bitumen to paving sites. Cost per barrel-mile is high relative to pipeline or marine, so trucking is reserved for short final distances where no larger-volume alternative exists.

IMO 2020 and the Transformation of Bunker Fuel

On January 1, 2020, the IMO's global marine fuel sulfur cap fell from 3.5% to 0.5%, the largest regulatory shift in the history of the bunker market. Ships without scrubbers could no longer burn high-sulfur fuel oil in open water. The bunker pool split three ways: most ships switched to VLSFO (0.5% sulfur); roughly 5,000 scrubber-equipped vessels kept burning HSFO at a steep discount that paid back the scrubber investment; and a growing minority used MGO, LNG, or methanol. The HSFO/VLSFO spread widened from nearly zero in 2019 to routinely more than $150 per tonne after the rule took effect. Chapter 9 (Finished Products) covers the product side in detail.

Singapore remains the world's largest bunker port, consistently delivering roughly 50 million tonnes of marine fuel per year, with Fujairah in the UAE and Rotterdam in the Netherlands holding second and third place.

Inland waterways are a minor petroleum transport mode in the US, carrying roughly 3 to 5 percent of total petroleum volumes. The Mississippi River system and the Gulf Intracoastal Waterway move refined products and some crude via barge, typically in 10,000 to 30,000 barrel loads. A standard barge tow is about 50,000 barrels. Pipelines handle 70 to 75 percent of US petroleum movement, coastal and ocean tankers 15 to 20 percent, and rail and truck share the remainder.

Shipping Chokepoints

A handful of narrow passages carry most of the world's seaborne oil. Disruption at any of them moves the oil price.

LNG Carriers in Brief

LNG moves on purpose-built refrigerated tanker ships that keep methane liquid at minus 162 degrees Celsius in insulated spherical (Moss-type) or membrane-wall (Gaztransport and Technigaz) tanks. Standard modern capacity runs 145,000 to 174,000 cubic meters; the Qatari Q-Flex (210,000) and Q-Max (266,000) classes are the largest built. Chapter 24 (US LNG) covers US LNG exports, the ships, and the terminal build-out in detail.

Trading Hubs

Pipelines, tanker terminals, and storage tanks cluster at a handful of hubs where physical oil meets the financial market. The most important hub in the world is Cushing, Oklahoma, the delivery point for WTI crude futures. By 2026 the Permian Basin is the world's most prolific producing region, with new pipeline systems connecting it to US Gulf Coast export terminals at Houston, Corpus Christi, and Freeport.

Incoterms and Delivery Pricing

International oil trade uses standardized delivery terms (Incoterms) published by the International Chamber of Commerce. FOB (Free on Board): buyer assumes risk once oil passes the ship's rail at loading. CIF (Cost, Insurance, Freight): seller pays transport and insurance to the discharge port. DDP (Delivered Duty Paid): includes all costs to the buyer's location. These terms set who bears transportation risk and cost at each stage.