Additive Injection System

Additive injection entails adding one or more chemical products in very small quantities to the main product. This is done to improve its physical features (like suitability for colder climates, antistatic, lower emissions, etc.), and the performance features or to comply with fiscal requirements for differentiation of the excise duty level (adulteration).

For years now, Isoil has been offering comprehensive solutions for this type of need, for the management of bay additive injection as well as for additive storage and pumping.

With a modular architecture capable of managing up to six additives simultaneously, the system adapts easily to different operational configurations and evolving market requirements.

Industry challenges in fuel additive injection

Fuel distribution terminals are facing increasing operational complexity. The growing use of additives is driven by several technical and regulatory requirements, including:

• Fuel marking and dyeing for fiscal compliance
• Performance enhancement additives that improve fuel properties, such as anti-static behavior, anti-foaming performance, or anti-icing protection
• Biofuel blending, which introduces additional variability in fuel composition and handling
• The need to inject multiple additives simultaneously according to specific recipes

These evolving requirements create several operational challenges:

• Maintaining accurate additive-to-product ratios
• Managing multiple additive streams within a limited terminal infrastructure
• Ensuring traceability and reporting of injected quantities
• Avoiding complex storage setups or dedicated loading points for each product type

To address these challenges, modern terminals increasingly require systems capable of injecting additives directly at the loading rack, close to the delivery point.

Advantages of the FLEXIMIX system

FLEXIMIX is engineered to meet these operational demands while improving efficiency and flexibility.

Key advantages include:

• High dosing accuracy - Additive quantities are measured with precision flow meters, ensuring accurate, verifiable injection ratios.
  
  
• Operational flexibility - The modular architecture allows the system to manage from one to six additives simultaneously, adapting to different product recipes and operational needs.
  
  
• Modular and compact design - In order to locate the units where necessary, thus reducing piping and wiring.
  
  
• Easy integration with terminal systems - The system can interface with able to interface with ISOIL’s as well as with 3rd party equipments.
  
  
• Reliable and safe operation - Advanced monitoring features detect abnormal conditions such as additive flow deviations, communication failures, or unauthorized injection events.
  
  
• Easy installation in existing gantries thanks to small dimensions and modular design, and simple configuration both locally and by remote communication.
  
  
• Reduced infrastructure complexity - By mixing additives directly at the loading rack, operators can reduce storage requirements and eliminate the need for product-dedicated loading lines.

How the FLEXIMIX injection system works

The FLEXIMIX system operates through a modular architecture composed of three main components:

Injection Controller Main Unit (IC-M)

The Injection Controller Main Unit manages the additive injection process.It receives pulse signals from the main product flow meters and controls the injection valves accordingly.

The controller continuously compares the measured additive flow with the main product flow to maintain the programmed additive-to-product ratio. If deviations occur, the controller adjusts the injection process in real time.

Operational parameters, injected quantities, alarms, and system status can be monitored directly from the graphical display or through communication with terminal automation systems.

Injection Controller Extension Units (IC-E)

Extension units increase the system’s injection capability.By connecting additional controllers via CAN-bus communication, the system can manage multiple injection blocks and support complex additive recipes.

Injection Blocks (IB2)

Each Injection Block performs the physical injection and measurement of the additive.

The stainless-steel block includes:

• A precision oval gear flow meter
• A solenoid valve controlling the injection
• A fine mesh strainer
• Flow regulating valves and check valves

This configuration allows accurate measurement and control of the additive flow, with typical injection ranges between 15 and 3000 ppm, depending on the selected meter configuration.

The applications of additive injection systems

One of the core features of additive injection systems is that they can be crucial in multiple sectors.

• The aviation industry can hugely benefit from the additive mixing accuracy of these fuel solutions, ensuring the safety and performance of the aircraft.
• In the maritime field as well, additive injection is essential in order to preserve the integrity of fuel due to the challenging conditions you can find at sea. 
• This equipment has a significant impact on fuel performance in the automotive sector. As a matter of fact, it can lower emissions by aligning cars’ engines to current environmental regulations.

However, additive injection is instrumental to guarantee specific performance and quality standards’ enhancement. In fact, they can be harnessed to improve lubrication and combustion while exerting an anti-corrosive action.

How to maintain additive injection systems

Additive injection systems should undergo maintenance operations to maintain their functioning standards. 

• Firstly, it is important to conduct regular controls to check if the equipment presents any signs of wear and tear. This is vital for pumps, valves, and filters. 
• Calibration is another fundamental part of the maintenance process, as it ensures perfect and smooth dosing, preserving the fuel properties. 
• Filters cleaning can protect these systems from malfunctioning, and always guaranteeing excellent performance at all times. 

It should not be understated how electronic devices and components of the systems should be properly handled, especially in harsh environments where climatic conditions are extreme.

Your partner for reliable additive injection solutions

Selecting the right additive injection system is essential to ensure fuel quality, operational efficiency, and regulatory compliance within modern fuel distribution infrastructures.

With decades of experience in fuel measurement and terminal automation technologies, Isoil designs and manufactures advanced additive injection systems engineered for accuracy, flexibility, and long-term reliability. Our solutions are developed to integrate seamlessly with existing loading racks and terminal systems while supporting the increasing complexity of fuel formulations, including biofuels and multi-additive recipes.

From modular injection units to fully customized additive management skids, Isoil provides complete engineering solutions tailored to the operational needs of terminals, refineries, and fuel distribution facilities.

Whether the goal is to improve dosing accuracy, simplify additive logistics, or enable premium fuel formulations, our systems deliver precise measurement, full traceability, and dependable performance in demanding industrial environments.

FAQ – Additive Injection Systems

What is an additive injection system?

An additive injection system is a device used in fuel terminals to dose specific additives into fuel during loading operations. It ensures that additives are injected in precise quantities to maintain fuel quality and compliance.

How do additive injection systems improve fuel quality?

They improve fuel quality by accurately dosing performance additives that enhance combustion efficiency, protect engines, and ensure compliance with fuel specifications.

How can fuel distributors offer premium fuels with additive injection systems?

By injecting specialized additive packages during loading, distributors can transform standard fuels into premium fuels without storing multiple fuel grades.

How do additive injection systems work?

The system synchronizes additive injection with the main fuel flow, using flow signals and precision meters to maintain the correct additive-to-fuel ratio during loading.