UNE-EN ISO 12156-1:2016

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and materials
6 Apparatus
7 Preparation and calibration
   7.1 Preparation of apparatus
   7.2 Calibration and correction
8 Test procedure
9 Measurement of wear scar
10 Calculations
   10.1 Uncorrected mean wear scar diameter (MWSD)
   10.2 Initial absolute vapour pressure (AVP[1])
   10.3 Final absolute vapour pressure (AVP[2])
   10.4 Mean absolute vapour pressure (AVP)
   10.5 Corrected wear scar diameter (WS1,4)
11 Test report
12 Precision
   12.1 Repeatability, r
   12.2 Reproducibility, R
Annex A (informative) Measurement of HFRR wear scars

This part of ISO 12156 specifies a test method using the high-frequency reciprocating rig (HFRR), for assessing the lubricating property of diesel fuels, including those fuels which may contain a lubricity-enhancing additive. It defines two methods for measurement of the wear scar; Method A - Digital Camera, and Method B - Visual Observation.

This test method applies to fuels used in diesel engines.

NOTEIt is not known if this test method will predict the performance of all additive/fuel combinations. NUEVO: including paraffinic fuels for which no additional correlation testing has been performed. Nevertheless, no data has been presented to suggest that such fuels are not within scope.