ASTM D1838-91(2001)e1

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM
International (www.astm.org) for the latest information.
An American National Standard
e1
Designation: D 1838 – 91 (Reapproved 2001)
Standard Test Method for
Copper Strip Corrosion by Liquefied Petroleum (LP) Gases
This standard is issued under the fixed designation D1838; 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.
e NOTE—Warning notes were placed in the text editorially in May 2001.
1. Scope copper-alloy fittings and connections that are commonly used
in many types of utilization, storage, and transportation equip-
1.1 This test method detects the presence of components in
ment.
liquefied petroleum gases which may be corrosive to copper.
NOTE 1—For an equivalent copper strip test applicable to less volatile 5. Apparatus
petroleum products, see Test Method D130.
5.1 Corrosion Test Cylinder, constructed of stainless steel
1.2 The values stated in acceptable metric units are to be
with an O-ring removable top closure according to the dimen-
regarded as the standard. The values in parentheses are for
sions given in Fig. 1. Provide a flexible aluminum connecting
information only.
hosewithswivelconnectionswithadaptertoa6.4mm( ⁄4-in.)
1.3 This standard does not purport to address all of the
pipe. The whole assembly shall be capable of withstanding a
safety concerns, if any, associated with its use. It is the
hydrostatictestpressureof6895kPa(1000psig).Noleakshall
responsibility of the user of this standard to establish appro-
be discernible when tested at 3450 kPa (500 psig) with gas.
priate safety and health practices and determine the applica-
5.2 Water Bath, capable of being maintained at 37.8 6
bility of regulatory limitations prior to use. For specific hazard
0.5°C (100 6 1°F). Incorporate suitable supports to hold the
statements, see 6.1, 8.3.1, and Annex A1.
testcylinderinanuprightposition.Makethebathdeepenough
sothattheentirecylinderandvalveswillbecoveredduringthe
2. Referenced Documents
test.
2.1 ASTM Standards:
5.3 Thermometer—AnASTMDensityThermometerhaving
D130 TestMethodforDetectionofCopperCorrosionfrom
a range from−20 to 105°C (−5 to+215°F), graduated in
Petroleum Products by the Copper Strip Tarnish Test
0.2°C (0.5°F) subdivisions, and conforming to the require-
E1 Specification for ASTM Thermometers
ments for Thermometer 12C (12F), as prescribed in Specifica-
tion E1.
3. Summary of Test Method
5.4 Strip Polishing Vise, to hold the copper strip firmly
3.1 A polished copper strip is immersed in approximately
without marring the edges. For convenient vises see Test
100 mLof the sample and exposed at a temperature of 37.8°C
Method D130.
(100°F) for1hina cylinder of suitable working pressure. At
6. Materials
the end of this period, the copper strip is removed and rated as
one of the four classifications of theASTM Copper Corrosion
6.1 Wash Solvent—Use acetone or knock test grade
Standards.
2.2.4 trimethylpentane. (Warning— Extremely flammable.
See Annex A1.)
4. Significance and Use
1 1
6.2 Copper Strip, 12.5 mm ( ⁄2 in.) wide, 1.5 to 3.0 mm ( ⁄16
4.1 Copper corrosion limits provide assurance that difficul-
to ⁄8 in.) thick, cut 75 mm (3 in.) long from smooth-surfaced,
ties will not be experienced in deterioration of the copper and
hard-temper, cold-finished copper of 99.9+percent purity;
electricalbusbarstockisgenerallysuitable.Drilla3.2mm( ⁄8
in.) hole approximately 3.2 mm ( ⁄8 in.) from one end in the
This test method is under the jurisdiction of ASTM Committee D02 on
centerofthestrip.Thestripscanbeusedrepeatedlybutshould
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
be discarded if the surfaces become deformed.
D02.H on Liquefied Petroleum Gas.
Current edition approved Aug. 15, 1991. Published October 1991. Originally
published as D1838–61T. Last previous edition D1838–89.
Annual Book of ASTM Standards, Vol 05.01.
Annual Book of ASTM Standards, Vol 14.03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM
International (www.astm.org) for the latest information.
D 1838
7.2 FinalPolishing—Removeastripfromthewashsolvent.
Holding it in the fingers protected with ashless filter paper,
polish first the ends and then the sides with the 105-µm
(150-mesh) silicon carbide grains picked up from a clean glass
plate with a pad of absorbent cotton moistened with a drop of
wash solvent. Wipe vigorously with fresh pads of absorbent
cotton and subsequently handle only with stainless steel
forceps; do not touch with the fingers. Clamp in a vise and
polish the main surfaces with silicon carbide grains on absor-
bent cotton. Rub in the direction of the long axis of the strip,
carryingthestrokebeyondtheendofthestripbeforereversing
the direction. Clean all metal dust from the strip by rubbing
vigorouslywithcleanpadsofabsorbentcottonuntilafreshpad
remainsunsoiled.Whenthestripiscleanimmediatelyattachto
the dip tube and immerse it in the prepared test bomb.
7.2.1 It is important to polish the whole surface of the strip
uniformlytoobtainauniformlystainedstrip.Iftheedgesshow
wear (surface elliptical) they will likely show more corrosion
than the center. The use of a vise will facilitate uniform
polishing.
8. Procedure
8.1 With valve B (Fig. 1), open, place approximately 1 mL
ofdistilledwaterintoacleantestcylinderandswirltomoisten
thewalls;allowtheremaindertodrainfromthecylinder,insert
Metric Equivalents
in. mm in. mm the freshly polished copper strip suspended from the hook on
⁄8 3.2 3 76
the dip tube making sure that the bottom of the strip is at least
⁄4 6.4
6.4 mm ( ⁄4 in.) from the bottom of the cylinder when
1 ⁄2 38.1 6 152
assembled.Afterassemblyoftheapparatus,closebothvalve A
FIG. 1 Copper Strip Corrosion Test Cylinder
(Fig. 1), on closure assembly with outage tube, and valve B.
8.2 Holding the test cylinder upright so as not to wet the
6.3 Polishing Materials—Silicon carbide grit paper of vari- copper strip with water, attach the sample source to the test
ous degrees of fineness including 65-µm (240-grit) paper or cylinder valveA(Fig. 1) by means of a short length of flexible
cloth;alsoasupplyof105-µm(150-mesh)siliconcarbidegrain aluminum tubing that has been purged with the sample.Admit
and pharmaceutical grade absorbent cotton (cotton wool). somesampletothecylinderbyopeningthevalveatthesample
6.4 Copper Corrosion Standard Plaques are available. source and then valve A.
Their care and inspe
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