Fuel Terminals

A fuel terminal receives white products such as gasoline, diesel and jet fuel by pipeline, ship or truck, holds them in storage tanks and dispatches them, most often by road tanker. What drives its metering, loading and safety requirements is the character of the products it handles. Volatility determines how vapor must be managed, conductivity determines how static charge must be controlled, and the size of the product slate determines how lines are segregated and how contamination is avoided. Because every receipt and every dispatch is a quantity changing hands, measurement at a fuel terminal has a direct commercial consequence.

This page outlines how fuel terminals operate and points to the detailed pages on loading, unloading, metering, custody transfer and terminal automation. Loading engineering that applies to any liquid is covered in the truck loading and unloading terminals solution family.

How the product slate shapes the design

·         Gasoline: Highly volatile. Collecting the vapor displaced from truck compartments during loading, and routing it to vapor recovery where regional regulations require it, is a central design topic.

·         Diesel: Less volatile, but commonly blended with biodiesel (FAME) or paraffinic components, which adds blend ratio measurement and component receipt to the process.

·         Jet fuel: Product quality protection comes first. Dedicated tanks, lines and loading points, together with quality control steps, are defined at the start of the project.

·         Blend components and additives: Ethanol, biodiesel, butane and performance additives are received, stored and injected into the product at the time of loading.

Where quantity is measured in a fuel terminal

Quantity is not determined at a single point. It is measured several times along the product's path through the terminal, and each point has its own purpose and hardware needs.

Vapor, static and overfill: three safety themes

Gasoline vapor is pushed out of the compartment as the truck fills. Many jurisdictions require that vapor to be collected through a vapor-tight line and processed; the European Union, for example, prescribes bottom loading and vapor recovery at road tanker gantries. With low-conductivity products, charge builds up as the fuel flows, which is why truck grounding is verified before loading and the initial loading rate is limited. Overfill prevention for truck compartments and overfill protection for storage tanks are two separate layers, each addressed by different standards. The extent of these measures is set together with the hazardous area classification and the project specification.

Custody measurement is the revenue side of the terminal

Fuel expands with temperature, so the volume indicated by a meter is converted to the reference temperature defined in the contract or in regulation before invoicing. A process transfer meter and a sales meter may use the same meter technology; what separates them is the verification method, the record keeping and whether legal metrology applies. The measuring system is assessed as a whole, and the meter's own performance figure is not a sufficient indicator on its own.

What TLY Enerji contributes

For fuel truck loading and unloading facilities, TLY Enerji provides system design, supply of instruments, valves, pumps and flow meters, engineering, installation, commissioning and maintenance. Automation and control of loading and unloading operations can be part of the same scope. For storage tanks, civil works and the terminal as a whole, the scope of supply is defined separately for each project against the technical specification.

Fuel terminal solutions

·         Fuel truck loading systems: Product segregation by compartment, additive injection and static control.

·         Fuel truck unloading systems: Preventing misdelivery and reconciling received quantities.

·         Fuel metering skids: Choosing meters, temperature correction and proving for each product.

·         Fuel custody transfer metering: Invoicing on temperature-corrected volume and legal metrology.

·         Top loading at fuel terminals: Top loading in existing facilities and vapor collection upgrades.

·         Bottom loading at fuel terminals: Loading integrated with vapor recovery and overfill prevention.

·         Multi-bay fuel loading terminals: Sizing the number of bays and product arms.

·         Fuel terminal automation systems (TAS): Automating order, loading, bill of lading and inventory processes.

·         Truck loading and unloading terminals: Fluid-independent map of loading and unloading solutions.

·         Biofuel blending systems: Adding ethanol and biodiesel components to finished fuels.

Frequently asked questions

Is a fuel terminal the same as a truck loading system?

No. A truck loading system is a subsystem at the bay: pump, meter, control valve, loading arm and preset controller. A terminal also includes product receipt, storage tanks, tank gauging, vapor processing, fire and safety systems, terminal automation and site infrastructure. Which of these sits inside each supplier's scope should be defined at the very start of a project.

Can gasoline and diesel be loaded from the same loading point?

Yes. Multi-product arms and arrangements that pass products through one meter in sequence are in common use. The residual volume left in the line at each product change, the need for a separate meter factor per product and the vapor collection requirement should be assessed together. Quality-sensitive products such as jet fuel are usually kept on dedicated lines.

Which terminal measurements count as custody transfer?

Any measurement at which ownership and payment change hands: the sale at the loading rack and the purchase at pipeline or truck receipt. Transfers between tanks inside the terminal are usually for process or stock control purposes. Whether a given point falls under legal metrology control depends on national regulations and the contracts in place.