What is a wear scar?

What is a wear scar?

Wear scar is the metric used to determine the quality of oils, greases and fuel lubricity. Visual observation is widely accepted method to detect and quantify the wear on the tribologically tested specimens.

What is HFRR test?

HFRR is a measurement for lubrication of Diesel or heating oil and stands for high frequency reciprocating rig. The value is given in μm, lower is better. The measured value is the diameter of the flattening of the ball after the test.

How do you check lubricity?

Abstract: The lubricity of diesel fuel can be measured in vehicle tests, pump rig tests, or bench tests. The most important bench tests are the High Frequency Reciprocating Rig (HFRR) and the Scuffing Load Ball-on-Cylinder Lubricity Evaluator (SLBOCLE).

How is fluid lubricity measured?

The lubricity of a substance is not a material property, and cannot be measured directly. Tests are performed to quantify a lubricant’s performance for a specific system. This is often done by determining how much wear is caused to a surface by a given wear-inducing object in a given amount of time.

Is lubricity a real word?

noun, plural lu·bric·i·ties. oily smoothness, as of a surface; slipperiness. ability to lubricate; capacity for lubrication: the wonderful lubricity of this new oil. instability; shiftiness; fleeting nature: the lubricity of fame and fortune.

What is the unit of lubricity?

According to EN 590, the lubricity is defined by the wear scar diameter in the high frequency reciprocating rig (HFRR) tests and should not exceed 460 μm. Fuel lubricity in certain parts of the world are worse and some areas are working with fuels giving a wear scar diameter in the test of 520 μm.

Does biodiesel have low lubricity?

Biodiesel is known to have low or no sulfur content with no aromatics content, high flash point, good lubricity [2,6].

What is oil Demulsibility?

Demulsibility is the ability of oil to separate from water. Oil and water naturally separate because like molecules attract each other. Oil sticks with oil, water sticks with water. Oil is “hydrophobic”, or “afraid of water,” which is a benefit when it comes to fluids like turbine oil.

What is high lubricity?

oily smoothness, as of a surface; slipperiness. 2. ability to lubricate; capacity for lubrication. the wonderful lubricity of this new oil.

What is the difference between viscosity and lubricity?

Lubricity Connexion to Viscosity When oils get hot, viscosity goes down and so does the lubricity, which is why oil-based hydraulics have critical operating temperature zones. Conversely when oil gets below freeze point, it becomes more viscous and won’t operate well as a hydraulic fluid.