ASTM D3613-98
(Practice)Standard Practice for Sampling Insulating Liquids for Gas Analysis and Determination of Water Content (Withdrawn 2007)
Standard Practice for Sampling Insulating Liquids for Gas Analysis and Determination of Water Content (Withdrawn 2007)
SCOPE
1.1 This practice covers sampling electrical insulating liquids having a viscosity less than 650 cSt at 40oC from apparatus for analysis of their gas content or for measurement of water content, or both. Guide D117, Test Methods D1533, and Test Methods D3612 provide detailed information regarding gas and water testing. Definitions of terms used in this practice may be found in Terminology D2864.
1.2 This standard does not purport to address all of the safety problems, 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. Specific precautionary statements are given in Section 6 and 7.
WITHDRAWN RATIONALE
This practice covers sampling electrical insulating liquids having a viscosity less than 650 cSt at 40C from apparatus for analysis of their gas content or for measurement of water content, or both.
Formerly under the jurisdiction of Committee D27 on Electrical Insulating Liquids and Gases and Subcommittee D27.07 on Physical Test, this practice was withdrawn in July 2007 because the standard has been incorporated into the revised Practices D 923 for Sampling Electrical Insulating Liquids.
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.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D 3613–98
Standard Practice for
Sampling Insulating Liquids for Gas Analysis and
Determination of Water Content
This standard is issued under the fixed designation D 3613; 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.
1. Scope 4. Apparatus
1.1 This practice covers sampling electrical insulating liq- 4.1 Sample Containers, may be glass syringes, stainless
uids having a viscosity less than 650 cSt at 40°C from steel cylinders, or metal cans having flexible sides (to allow for
apparatus for analysis of their gas content or for measurement volume changes caused by expansion or contraction of the oil).
of water content, or both. Guide D 117, Test Methods D 1533, 4.1.1 Glass Syringes, of a suitable size terminated with a
and Test Methods D 3612 provide detailed information regard- luer lock fitting to which is attached a three-way stopcock,
ing gas and water testing. Definitions of terms used in this should be used. Syringes having precision ground barrels and
practice may be found in Terminology D 2864. pistons are preferred.
1.2 This standard does not purport to address all of the 4.1.2 Stainless Steel Sampling Cylinders, equipped with
safety concerns, if any, associated with its use. It is the valves on each end may be used for sampling. These cylinders
responsibility of the user of this standard to establish appro- have the disadvantage of not allowing visual inspection of the
priate safety and health practices and determine the applica- interior of the cylinder.
bility of regulatory limitations prior to use. Specific precau- 4.1.3 Flexible-Sided Metal Cans, having screw caps may
tionary statements are given in Sections 6 and 7. also be used.
4.2 Flush Oil Container—of at least 3.8 L(1 gal) to contain
2. Referenced Documents
the required flush liquid during preparation and sampling.
2.1 ASTM Standards:
4.3 Clear Poly (Vinyl-Chloride) Tubing—or any tubing that
D 117 Guide to Test Methods and Specifications for Elec- meets the requirements of this practice that is oil resistant. Size
trical Insulating Oils of Petroleum Origin
shall be selected to guarantee a gas and liquid tight fit at the
D 923 Test Methods for Sampling Electrical Insulating
sampling port and on the syringe or steel cap. To minimize
Liquids waste and potential spills a length of 60 cm (24 in.) is
D 1533 Test Methods for Water in Insulating Liquids
suggested and has proven to be acceptable for manipulation of
D 2864 Terminology Relating to Electrical Insulating Liq- the collection container while attached to the sample port.
uids and Gases
5. Cleaning of Apparatus
D 3612 Test Method for Analysis of Gases Dissolved in
Electrical Insulating Oils by Gas Chromatography 5.1 A proven method for cleaning sample containers and
accessories is the use of a cleaning agent that completely
3. Significance and Use
dissolvesliquidresidue,andshallthenbesubjectedtosoapand
3.1 A study of gases and moisture contained in insulating
water cleaning and water rinse followed by a distilled water
oils from transformers and other electrical power apparatus can rinse. See Test Methods D 923 for further details about general
frequently give an early indication of abnormal behavior of the
cleaning requirements.
apparatus, and may indicate appropriate action be taken on the 5.2 Allow the container to drain for 10 min, and dry in a
equipment before it suffers greater damage. Specific gas and
forced-draft oven at 110°C for not less than 1 h. When the
moisture content can be determined from oil samples for this drying period has expired, syringe pistons shall be placed in
purpose. Care must be taken in drawing samples to prevent
their barrels, valves closed; stainless steel cylinder valves
contamination and to ensure a truly representative sample. should be closed; or cans sealed with their screw cap. It is
desirable that stainless steel cylinders be evacuated and sealed
after cleaning.
This practice is under the jurisdiction of ASTM Committee D-27 on Electrical
5.3 The poly(vinyl chloride) tubing should be replaced with
Insulating Liquids and Gases and are the direct responsibility of Subcommittee
D27.07 on Physical Test.
new tubing each time a sample port is used. Cleaning the
Current edition approved April 10, 1998. Published September 1998. Originally
tubing should be considered impractical.
published as D 3613 – 77. Last previous edition D 3613 – 92.
2 5.4 Alternate Stainless Steel Cylinder Cleaning Method:
Annual Book of ASTM Standards, Vol 10.03.
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D 3613
5.4.1 Rinse the cylinder with a suitable volatile solvent. 7.2 All equipment filled with insulating fluid having a
5.4.2 Allow the cylinder to drain for 10 min with both specific gravity less than 1, should be sampled from the bottom
valves full open, placing the cylinders in a vertical position. valve.
5.4.3 Dry the cylinder by passing dry air through the 7.3 All equipment filled with insulating fluid having a
cylinder until the cylinder is dry. This should involve a volume specific gravity greater than 1, should be sampled at the top of
of air equivalent to at least 55 changes of the cylinder volume the tank at the 25°C (77°F) liquid level, so that a top sample of
during the 15 min period of drying. The air may be dried by the liquid may be obtained.
passing the air through two drying towers in series, each tower 7.4 Maintain the insulating fluid within the electrical appa-
is at least 9 cm diameter and 28 cm in height. Towers filled ratus being sampled at a level that will not reduce the electric
with 6–16 mesh indicating Silica Gel have been found accept- strength of the insulation system. Take extreme caution when
able. samples are drawn from electrical apparatus having a small
5.4.4 After 15 min close the cylinder valves and prepare the volume of insulating fluid.
cylinders for use. 7.5 Energized electrical apparatus being sampled must have
a positive pressure at the sample outlet, so as not to admit an
6. Preparation for Sampling
air bubble into the apparatus during the sampling process.
6.1 Check for positive pressure by first observing the 7.6 Do not sample electrical apparatus if only a drain plug is
pressurevacuumgage,ifoneispresent,thencheckforpositive
provided, as it would be difficult to control the flow.
pressure at a sample outlet by placing a slug of insulating fluid 7.7 Samples shall not be taken from energized instrument
in a piece of clear plastic tubing and attaching it to the sample
transformers.
outlet. While observing the slug of insulating fluid, slowly 7.8 Care must be taken in drawing samples to prevent
crack the sample outlet valve open. If the slug moves towards
contamination and to ensure a representative sample.
the electrical apparatus, a negative pressure exists. Sampling 7.9 Collection of samples in metal cans will result in
should be discontinued. If the slug moves away from the
atmospheric air contaminating the sample and the loss of gas
electrical apparatus, a positive pressure exists. Samples can be
from the oil into the atmosphere.Test Method D 3612,Table 1,
obtained safely. Extreme care should be used in performing
provides coefficients of variation for different gas-in-oil analy-
this procedure.
sis from samples collected in the three containers recom-
6.2 Place a flush-oil container under the main drain valve
mended in this practice.
and remove the security pipe plug from the drain valve. Wipe
7.10 New oil resistant tubing shall be used for each appa-
the inside of the valve and threads with a clean lint-free cloth.
ratus sample port.
Drain at least 1.9 L(2 qt) of fluid into the flush oil container to
7.11 When collecting samples with glass syringes for the
flush the drain valve and drain valve extension. One of two
determination of dissolved gases or water, or both, the syringe
procedures may then be used to prepare the sample outlet.
should be filled 80 % full. The filled syringe should contain no
6.2.1 Procedure A— Install the sample adapter on the drain
air. However, gas-saturated samples will begin to release gases
valve (suitable thread size bushing adapter IPS to ⁄8 in.
(bubbles) soon after sampling. Do not release any evolved
bayonet) with a piece of oil resistant tubing attached. Flush the gases (bubbles) since these gases must be included in the
valve at installed sample adapter, flushin
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