Storing Biodiesel

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Storing Your Biodiesel Fuel

Many of our customers ask us, “How long can biodiesel be stored?’ As much as we would love to blurt out a simple number and be done with the question, truthfully, the answer may vary from months to years depending on storage conditions.

The truth is all fuels will degrade over time. In fact, the EPA reports that ULSD diesel has a shelf life of between 3 to 6 months. Biodiesel, too, has a shelf life that can vary significantly, but with the proper fuel management, biodiesel's shelf life can be extended dramatically.

The biggest factors that affect biodiesel storage life include:
  • Microbial contamination
  • Chemical contamination
  • Exposure to light
  • Temperature
  • Exposure to air
  • The type of feedstock
  • And the additives
If a sample of biodiesel (or petroleum diesel for that matter) is contaminated with a fast growing microbe, under unfavorable conditions, the rapid growth and multiplication of the organisms can render the fuel unusable within a matter of days. To prevent this, always store biodiesel in clean airtight containers. The oxidative stabilizer sold on the Springboard Biodiesel website contains a biocide that will prevent the growth of known filter clogging microbes http://www.springboardbiodiesel.com/springboard-biodiesel-oxidative-stabilizer. If your fuel has already been attacked by a microbial outbreak, we recommend that you use a stronger biocide such as KILLEM.

Other than microbial attack, the other primary way that biodiesel fuel might go bad is through oxidative damage. Over time, oxygen can attack the chemical structure of the molecules of biodiesel. This typically occurs at the point in the carbon chain where there is a double bond between two of the carbon atoms. This oxidative attack results in acidic compounds being formed which makes the fuel acidic and can give it a rancid smell. As the oxidation progresses, the fuel becomes more viscous, more corrosive to components in the vehicles fuel system, and may even form sediments. There are many factors that can determine how long it takes for this process to occur to the point where the fuel becomes unusable. These factors include:
  • Free oxygen content of the fuel: Many commercial biodiesel companies, store their biodiesel under pure nitrogen in order to prevent oxygen from being able to reach the fuel. The typical small scale producer can help to extend their fuel’s life by keeping in a sealed container with as little headspace as possible.
  • Exposure to light: Sunlight is a powerful force that facilitates oxidation. Try taking a small sample of soy oil and putting it in direct sunlight and open air for a couple of days. You will find that it had turned into a rubbery plastic. This is due to polymers forming as the fuel is oxidized.
  • Feedstock source: Try the same experiment with beef tallow (which has very few double bonds in comparison to soy oil) and you will see that it is much more stable.
  • Temperature: The cooler the better. The seasoning process of cast iron cookware utilizes the tendency of oils to form polymers at high temperatures. You don’t want this to happen in your storage vessels.
  • Chemical contamination: The oxidation of the oils can be strongly catalyzed by the presence of trace metals, most notably, copper, iron, and zinc. Biodiesel is actually quite corrosive to copper and its alloys. Therefore it is important that plumbing, valves, and storage containers be free of copper, bronze, and brass.
There are several “stabilizers” on the market that effectively help slow the oxidation of the fuel. While there is no solution that can make the storage time indefinite, the oxidative stabilizer sold by Springboard Biodiesel is one of the most cost effective and efficient oxidative stabilizers on the market. For further information regarding the effect of the oxidative stabilizer on the storage life of biodiesel see our article, Springboard Biodiesel Oxidative Stabilizer Performance Data.

As the previous points illustrate, there are many factors that can dramatically affect the storage life of biodiesel. If it is stored under optimum conditions in all of the above areas, the shelf life of biodiesel may reach a period of years. How well the fuel lasts in comparison to this optimum length largely depends on the care taken by the user and how well they are able to eliminate or mitigate the risk factors outlined above.

Learn More About Biodiesel

  • Glossary of biodiesel terms
  • Biodiesel library
  • BioPro videos​
  • Customer Testimonials

About Springboard Biodiesel

  • Who are we?
  • The Springboard Biodiesel Network
  • Call us at +1.530.894.1793
  • Home
  • Products
    • BioPro 190 Biodiesel Processors
    • BioPro 380 Biodiesel Processors
    • Glycerin and Biodiesel Demethylation
    • CLL Biodiesel Production System
    • SpringPro T76
    • INCOSEP Accelerator
    • BioPro Processor Accessories >
      • Biodiesel Fueling Station
      • SpringFlow 250 Heat Exchanger
      • BioPro Pressurized Water Kit
      • Oxidative Stabilizer
      • WVO Transfer Pump
      • BD ZorbX Drywash Media
      • Methanol Pump
      • Oil Collection Systems
      • Fuel Nozzles
      • Screw Plug Immersion Heaters
      • DW-R10 Ion Exchange Resin
    • Return on Investment Calculator
    • Financing
    • BioPro Processor Gallery
  • Store
  • Library
    • Why a BioPro
    • Biodiesel Basics >
      • What Is Biodiesel
      • How the BP190 Works
      • Biodiesel Production
      • Technical Specs BioPro 190
      • Technical Specs for the BioPro 380
      • How the BP380 Works
      • Safety Features of BioPro Processors
      • Biodiesel Processor Basic Ingredients
      • Biodiesel Safety Information
      • Facts and Myths on Making Biodiesel
      • Biodiesel Quality
      • Benefits of BioPro Biodiesel Processors
      • Springboard Biodiesel Go/No-Go Kit
      • Biodiesel Frequently Asked Questions
    • Biodiesel Questions >
      • SVO vs Biodiesel
      • Biodiesel and Engine Life
      • Testing Small-Scale Biodiesel Quality
      • Preparing Feedstock for Biodiesel Production
      • Beef Tallow and Hydrogenated Oils
      • Methanol Vapors in BioPro Biodiesel Processors
      • Glycerin Layer in Biodiesel Production
      • Storing Biodiesel
      • Cold Weather Biodiesel Washing
      • Winter Storage and Retrieval
      • Storage for BioPro Processors
      • SpringPro T76 FAQ
    • More Information on BioPro Processors >
      • Acid-Catalyzed Esterification
      • Titration Batch Processing
      • Titration Methodologies
      • Reducing the CO2 Footprint
      • Biodiesel Mandates and Initiatives
      • ASTM
      • Reducing Carbon Footprint with Biodiesel
    • BioPro Videos
  • Markets
    • Biodiesel for Farmers
    • Biodiesel for Casinos
    • Biodiesel for Municipalities
    • Biodiesel for Schools >
      • Schools using BioPro Technology
    • Biodiesel for Restaurants
    • Biodiesel for the Military
    • Other Markets
    • Testimonials from BioPro Owners
  • About Us
    • About Springboard Biodiesel
    • Contact Springboard Biodiesel