WK92521 - New Test Method for Condition Monitoring of Ester Breakdown I&II in In-Service Polyol Ester Lubricants by Trend Analysis Using Fourier Transform Infrared (FT-IR) Spectrometry

Work Item

ASTM WK92521

New Test Method for Condition Monitoring of Ester Breakdown I&II in In-Service Polyol Ester Lubricants by Trend Analysis Using Fourier Transform Infrared (FT-IR) Spectrometry

1. Scope

1. Scope 1.1 This test method covers the monitoring of ester-base-stock breakdown I and II in in-service polyol ester lubricants such as those used in high-performance aircraft turbine engines and aero-derivative gas turbines such as those used in power generation, marine transport, and other non-aeronautical applications. 1.2 This test method uses Fourier transform infrared (FT-IR) spectrometry for monitoring buildup of ester-base-stock breakdown I and II in in-service polyol ester lubricants as a result of normal machinery operation. Polyol ester lubricants undergo thermal and hydrolysis degradation in the presence of oxygen and water to form a number of different chemical species, including organic acids, alcohols, and aldehydes. This test method is designed as a fast, simple, spectroscopic check for monitoring of degradation in in-service polyol ester lubricants with the objective of helping diagnose the operational condition of the machine based on measuring the level of ester-base-stock breakdown in the oil. 1.3 Acquisition of FT-IR spectral data for measuring ester-base-stock breakdown I and II in in-service oil and lubricant samples is described in Practice D7418. In this test method,

Keywords

Acquisition

Rationale

It is necessary to develop a new ASTM method because there currently does not exist a method for detecting and trending the breakdown of esters. Practice E2412 contains, in the annex, FIG A1.10 and Table A1.3, both of which briefly describe the wavelengths to monitor when interested in ester breakdown. I simply wish to translate this Practice into an ASTM-recognized Standard Test Method. The precision of the test method has not yet been determined by a formal interlaboratory study.

Details

Developed by Subcommittee: D02.96.03

Committee: D02

Staff Manager: Alyson Fick

Work Item Status

Date Initiated: 10-14-2024

Technical Contact: David Swanson

Item: 003

Ballot: D02.96 (24-06)

Status: Will Reballot Item