Diesel

January 13, 2020

Diesel is the refined middle distillate that powers road transport, construction, agriculture, mining and standby power generation. It is the workhorse fuel of the industrial economy: high energy density, reliable ignition and a distribution network that reaches almost every market. For a trading desk, it is also one of the most specification-sensitive products in the barrel.

The word “diesel” covers a family of grades. The sulfur limit, the cetane number and the cold-flow figure change from one market to the next, and a cargo that meets one specification may fail another. That is why diesel is sold against a written specification, not against a generic name.

The grades and what separates them

Diesel is graded by sulfur content and by cold-flow performance. The sulfur limit is the headline figure: 10ppm diesel meets the Euro 5 limit and is required in most modern markets; higher-sulfur grades serve older engines and off-road users. The cold-flow figure — the cold filter plugging point — is set by the climate the fuel will be used in.

• Sulfur — 10ppm for Euro 5 markets; higher limits for legacy markets.
• Cetane number — ignition quality; reported in the certificate of quality.
• Density and flash point — reported per lot.
• Cold filter plugging point — matched to the destination climate.
• Colour and appearance — reported per lot.

Why the specification matters

Modern engines and emissions systems are designed for low-sulfur fuel. A 10ppm cargo keeps particulate filters and catalytic systems inside their design window; a higher-sulfur cargo can clog filters and shorten the life of the emissions system. For a distributor or a fleet operator, the specification is not a detail — it is the difference between selling fuel and selling a compliance problem.

The cold-flow figure matters just as much. A cargo that gels in winter is not usable, however clean its sulfur figure. That is why the offer confirms the cold-flow window against the destination climate before the shipment is fixed.

Applications

Diesel serves four channels. Transport fleets and distributors take it as road fuel. Industry uses it for generators, boilers and process heat. Construction and mining use it for heavy machinery. Export traders move it into markets that need a specific sulfur and cold-flow window. Each channel needs its own specification, and the offer states which one the cargo meets.

Supply and logistics

Diesel moves in bulk parcels. Loading port, laycan, Incoterm (FOB, CFR, CIF, DAP) and inspection are agreed in the offer. The shipment travels with a certificate of quality and a certificate of quantity from an independent inspector. Because the product is a middle distillate, storage and handling at the discharge terminal follow the local fuel rules.

Quality assurance

Sampling at loading covers sulfur, cetane, density and cold-flow properties. The certificate is issued before the vessel sails. If the lot does not meet the agreed specification, it is not released, which protects the buyer from a cargo that would fail the destination’s fuel rules.

Frequently asked questions

What is the difference between 10ppm and higher-sulfur diesel? The sulfur limit. 10ppm meets Euro 5 and suits modern engines; higher-sulfur grades serve older engines and off-road users.

What is cetane number? A measure of ignition quality. A higher cetane number means easier ignition and smoother running.

Can the cold-flow figure be adjusted? Yes. The cargo is matched to the destination climate, and the offer confirms the cold-flow window.

What documents come with a diesel cargo? Certificate of quality, certificate of quantity, bill of lading and the commercial invoice.

Request an offer

Send the discharge port, the volume and the destination fuel specification, and the trading desk will return a specification, an indicative price and a loading window. For the Euro 5 limit in detail, see Diesel 10 ppm and Euro 5.