HFRR

{{short description|Lubrication measurement}}

{{Orphan|date=March 2024}}

File:HFRR_en.svg

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.{{Cite journal|last=Sugiyama|first=Kouseki|last2=Kajiwara|first2=Masataka|last3=Fukumoto|first3=Masahiro|last4=Mori|first4=Makihiko|last5=Goto|first5=Shinichi|last6=Watanabe|first6=Tomoko|date=2004-06-08|title=Lubricity of Liquefied Gas Assessment of Multi-Pressure/Temperature High-Frequency Reciprocating Rig (MPT-HFRR) -DME Fuel for Diesel|journal=SAE Technical Paper Series|volume=1|language=English|doi=10.4271/2004-01-1865}}{{Cite journal|date=2010-01-01|title=Characterization of the lubricity of bio-oil/diesel fuel blends by high frequency reciprocating test rig|journal=Energy|language=en|volume=35|issue=1|pages=283–287|doi=10.1016/j.energy.2009.09.020|issn=0360-5442|last1=Xu|first1=Yufu|last2=Wang|first2=Qiongjie|last3=Hu|first3=Xianguo|last4=Li|first4=Chuan|last5=Zhu|first5=Xifeng}}{{Cite web|url=https://www.astm.org/Standards/D6079|title=ASTM D6079 - 11(2016) Standard Test Method for Evaluating Lubricity of Diesel Fuels by the High-Frequency Reciprocating Rig (HFRR)|website=www.astm.org|access-date=2018-08-08}}{{Cite web|url=https://www.infineuminsight.com/insight/dec-2013/testing-the-test|title=HFRR best test for lubricity|website=www.infineuminsight.com|language=en|access-date=2018-08-08}}

It's important because high pressure injection pumps are only lubricated by the fuel itself. Density and viscosity are not sufficient describing the aptitude of the fuel.