ASTM D1534-95(2002)e1

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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e1
Designation:D 1534–95 (Reapproved 2002)
Standard Test Method for
Approximate Acidity in Electrical Insulating Liquids by
Color-Indicator Titration
This standard is issued under the fixed designation D 1534; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
e NOTE—Editorial changes were made in April 2002.
1. Scope hydroxide solution is added in small increments until the color
of the aqueous layer, after shaking and settling, is a faint pink.
1.1 This test method describes the determination of the
The volume of standard potassium hydroxide solution used
approximate total acid value of used electrical insulating
determines the approximate total acid value.
liquidshavingviscositieslessthan24cStat40°C.Itisasimple
procedure that can be applied in the field. Where a quantitative
4. Significance and Use
neutralization value is required, use Test Method D 664 or Test
4.1 The approximate acidity of used electrical insulating
Method D 974. These test methods should be applied in the
oils is an estimate of the total acid value of the oil. As acid
laboratory.
values increase, oil quality decreases. This is usually due to
1.2 This standard does not purport to address all of the
oxidation of the oil while in service. In general, acidic
safety concerns, if any, associated with its use. It is the
by-products produce increased dielectric loss, increased corro-
responsibility of the user of this standard to establish appro-
sivity, and may cause thermal difficulties attributable to in-
priate safety and health practices and determine the applica-
soluble components called “sludge.” This test method is
bility of regulatory limitations prior to use.
adapted to a specific volume of oil; total acid values of 0.05 to
2. Referenced Documents 0.5mgofpotassiumhydroxidepergramofoilisarangewhich
is functionally significant.
2.1 ASTM Standards:
D 664 Test Method forAcid Number of Petroleum Products
5. Apparatus
by Potentiometric Titration
5.1 Graduated Cylinder, 50 mL, stoppered.
D 974 Test Method for Acid and Base Number by Color-
2 5.2 Medicine Dropper, calibrated at 1-mL intervals.
Indicator Titration
3 5.3 Calibrated Pipet, 1-mL capacity, calibrated to deliver
D 1193 Specification for Reagent Water
0.05-mL increments.
3. Summary of Test Method
6. Reagents and Materials
3.1 To determine whether the acidity is greater or less than
6.1 Purity of Reagents—Use reagent grade chemicals in all
a specified arbitrary value, a fixed volume of liquid to be tested
tests. Unless otherwise indicated, it is intended that all reagents
is added to a graduated cylinder, together with a small amount
shall conform to the specifications of the Committee on
of indicator (phenolphthalein) and the appropriate quantity of
Analytical Reagents of theAmerican Chemical Society, where
standard potassium hydroxide solution. The mixture is shaken
such specifications are available. Other grades may be used,
and allowed to separate. The color of the aqueous layer at the
provided it is first ascertained that the reagent is of sufficiently
bottom of the container when testing mineral oils, or at the top
high purity to permit its use without lessening the accuracy of
when testing askarels, determines whether the acidity is less
the determination.
than or greater than the arbitrary value chosen.
6.2 PurityofWater—Unless otherwise indicated, references
3.2 To determine the approximate total acidity, the proce-
to water shall be understood to mean reagent water (see Note
dure is the same as described in 3.1 except that the potassium
1) conforming to Specification D 1193.
This test method is under the jurisdiction of ASTM Committee D27 on
Electrical Insulating Liquids and Gases and is the direct responsibility of Subcom- Reagent Chemicals, American Chemical Society Specifications, American
mittee D27.06 on Chemical Test. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Current edition approved Sept. 10, 1995. Published November 1995. Originally listed by the American Chemical Society, see Analar Standards for Laboratory
published as D 1534 – 58 T. Last previous edition D 1534– 90. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Annual Book of ASTM Standards, Vol 05.01. and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
Annual Book of ASTM Standards, Vol 11.01. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 1534
NOTE 1—Any grades of water listed in Specification D 1193 are
8. Calculation
deemed satisfactory for the purpose of this test method.
8.1 For
...