Diesel Fuel Cleanliness Standards
The awareness of fuel cleanliness in diesel engines is not new – in fact, it was first documented as early as 1931 with the introduction of the Caterpillar Diesel Sixty Tractor. The fuel injection pressure developed by the engine was only 1,250 psi, yet the caption from an article of the time tells a powerful story and it should be reflected on in respect to today’s engines.
In today’s world, defining how clean or dirty fuel is is critically important, and as such, fuel cleanliness levels are now measured and reported according to the ISO Cleanliness Code 4406:1999. The International Organization for Standardization (ISO) created the cleanliness code ISO4406:1999 to quantify particulate contamination levels per millilitre of fluid at three sizes: 4μ, 6μ, 14μ.
|Scale Number||Particles per ml. More Than||Particles per ml. Less or Equal|
|Diesel Catagory||Cleanliness Level|
Diesel Fuel Injection – Advancing Technologies & Cleanliness Levels
|EUI||16,000 psi||1-4 cSt||5-8μm||18/16/13|
|HPCR||36,000 psi||1-4 cSt||1-4μm||18/16/13|
Diesel Cleanliness Levels
|Company||Specified ISO Cleanliness Level|
|World Wide Fuel Charter||18/16/13|
|Fuel Injector OEM||12/9/6|
Fuel Cleanliness – Deciphering the CodeWhen referring to the ISO4406:1999 cleanliness code, it can sometimes be difficult to comprehend how much contamination the codes actually represent in a real world operating system. To help clarify this, we can use a real world scenario that is more meaningful. The example used to demonstrate this is as follows:Model: Cummins DQKB Diesel Generator
Rating: 1450kW (1813kVA)
Load: 100% Peek Load
Run Time: 5000 hrs/year
Fuel: 74.8 US GPH (283 L/hr)The following table provides an indication of how much contamination is being presented to the engine fuel system each year under this example.
Volume of Contamination
|Fuel Cleanliness||Volume of Contamination|
|ISO 23/21/18||26.4 lb/year|
|ISO 18/16/13||0.10 lb/year|
|ISO 12/9/6||0.8 lb/year|