ASTM D2624-07
(Test Method)Standard Test Methods for Electrical Conductivity of Aviation and Distillate Fuels
Standard Test Methods for Electrical Conductivity of Aviation and Distillate Fuels
SIGNIFICANCE AND USE
The ability of a fuel to dissipate charge that has been generated during pumping and filtering operations is controlled by its electrical conductivity, which depends upon its content of ion species. If the conductivity is sufficiently high, charges dissipate fast enough to prevent their accumulation and dangerously high potentials in a receiving tank are avoided.
SCOPE
1.1 These test methods cover the determination of the electrical conductivity of aviation and distillate fuels with and without a static dissipator additive. The test methods normally give a measurement of the conductivity when the fuel is uncharged, that is, electrically at rest (known as the rest conductivity).
1.2 Two test methods are available for field tests of fuel conductivity. These are: (1) portable meters for the direct measurement in tanks or the field or laboratory measurement of fuel samples, and (2) in-line meters for the continuous measurement of fuel conductivities in a fuel distribution system. In using portable meters, care must be taken in allowing the relaxation of residual electrical charges before measurement and in preventing fuel contamination.
1.3 &solely-SI-units;
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. For specific precautionary statements, see 7.1, 7.1.1, and 11.2.1.
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An American National Standard
Designation: D 2624 – 07
Designation: 274/99
Standard Test Methods for
1
Electrical Conductivity of Aviation and Distillate Fuels
This standard is issued under the fixed designation D2624; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* D4306 Practice for Aviation Fuel Sample Containers for
Tests Affected by Trace Contamination
1.1 These test methods cover the determination of the
D4308 Test Method for Electrical Conductivity of Liquid
electrical conductivity of aviation and distillate fuels with and
Hydrocarbons by Precision Meter
without a static dissipator additive. The test methods normally
give a measurement of the conductivity when the fuel is
3. Terminology
uncharged, that is, electrically at rest (known as the rest
3.1 Definitions:
conductivity).
3.1.1 picosiemens per metre, n—the unit of electrical con-
1.2 Two test methods are available for field tests of fuel
ductivity is also called a conductivity unit (CU). A siemen is
conductivity. These are: (1) portable meters for the direct
the SI definition of reciprocal ohm sometimes called mho.
measurementintanksorthefieldorlaboratorymeasurementof
212 21 21
fuel samples, and (2) in-line meters for the continuous mea-
1pS/m 51 310 V m 51cu 51picomho/m (1)
surementoffuelconductivitiesinafueldistributionsystem.In
3.1.2 rest conductivity, n—thereciprocaloftheresistivityof
using portable meters, care must be taken in allowing the
uncharged fuel in the absence of ionic depletion or polariza-
relaxation of residual electrical charges before measurement
tion.
and in preventing fuel contamination.
3.1.2.1 Discussion—It is the electrical conductivity at the
1.3 The values stated in SI units are to be regarded as
initial instant of current measurement after a dc voltage is
standard. No other units of measurement are included in this
impressed between electrodes, or a measure of the average
standard.
current when an alternating current (ac) voltage is impressed.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Summary of Test Methods
responsibility of the user of this standard to establish appro-
4.1 Avoltageisappliedacrosstwoelectrodesinthefueland
priate safety and health practices and determine the applica-
the resulting current expressed as a conductivity value. With
bility of regulatory limitations prior to use. For specific
portable meters, the current measurement is made almost
precautionary statements, see 7.1, 7.1.1, and 11.2.1.
instantaneously upon application of the voltage to avoid errors
duetoiondepletion.Iondepletionorpolarizationiseliminated
2. Referenced Documents
in dynamic monitoring systems by continuous replacement of
2
2.1 ASTM Standards:
thesampleinthemeasuringcell,orbytheuseofanalternating
voltage. The procedure, with the correct selection of electrode
1 size and current measurement apparatus, can be used to
These test methods are under the jurisdiction of ASTM Committee D02 on
measure conductivities from 1 pS/m or greater. The commer-
Petroleum Products and Lubricants and are the direct responsibility of Subcommit-
tee D02.J0.04 on Additives and Electrical Properties.
cially available equipment referred to in these methods covers
In the IP, these test methods are under the jurisdiction of the Standardization
aconductivityrangeupto2000pS/mwithgoodprecision(see
Committee.
Section 12), although some meters can only read to 500 or
CurrenteditionapprovedJuly1,2007.PublishedJuly2007.Originallyapproved
in 1967. Last previous edition approved in 2006 as D2624–06a. 1000 pS/m.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D2624–07
4.1.1 The EMCEE Model 1152 Meter is available with 8.1.1 If the cell is in contact with water and the instrument
expandedrangesbuttheprecisionoftheextendedrangemeters isswitchedon,animmediateoffscalereadingwillbeobtained.
has not been determined. If it is necessary to measure conduc- Ifthecellhasbeenincontactwithwater,itshallbethoroughly
tivities below 1 pS/m, for example in the case of clay treated r
...
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