ASTM-D1534 › Standard Test Method for Approximate Acidity in Electrical Insulating Liquids by Color-Indicator Titration
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Scope
1.1 This test method describes the determination of the approximate total acid value of used electrical insulating liquids having viscosities less than 24 cSt at 40°C. It is a simple procedure that can be applied in the field. Where a quantitative neutralization value is required, use Test Method D664 or Test Method D974. These test methods should be applied in the laboratory.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Significance and Use
4.1 The approximate acidity of used electrical insulating oils is an estimate of the total acid value of the oil. As acid values increase, oil quality decreases. This is usually due to oxidation of the oil while in service. In general, acidic by-products produce increased dielectric loss, increased corrosivity, and may cause thermal difficulties attributable to insoluble components called “sludge.” This test method is adapted to a specific volume of oil; total acid values of 0.05 to 0.5 mg of potassium hydroxide per gram of oil is a range which is functionally significant.
Keywords
acidity; color titration; insulating liquid; neutralization number ;; ICS Number Code 29.040.10 (Insulating oils)
To find similar documents by ASTM Volume:
10.03 (Electrical Insulating Liquids and Gases; Electrical Protective Equipment)
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Document Number
ASTM-D1534-95(2017)
Revision Level
1995 R17 EDITION
Status
Current
Modification Type
Reapproval
Publication Date
June 1, 2017
Document Type
Test Method
Page Count
3 pages
Committee Number
D27.06