ASTM G202-12
(Test Method)Standard Test Method for Using Atmospheric Pressure Rotating Cage
Standard Test Method for Using Atmospheric Pressure Rotating Cage
SIGNIFICANCE AND USE
3.1 The rotating cage (RC) test system is relatively inexpensive and uses simple flat specimens that allow replicates to be run with each setup. (1-11).3
3.2 The RC method can be used to evaluate either corrosion inhibitors, or materials, or both. Guide G184 describes the procedure to use rotating cage to evaluate corrosion inhibitors.
3.3 In this test method, a general procedure is presented to obtain reproducible results using RC to simulate the effects of different types of coupon materials, inhibitor concentrations, oil, gas and brine compositions, temperature, and flow. Oil field fluids may often contain sand; however, this test method does not cover erosive effects that occur when sand is present.
SCOPE
1.1 This test method covers a generally accepted procedure to conduct the rotating cage (RC) experiment under atmospheric pressure.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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.
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Designation: G202 − 12
Standard Test Method for
1
Using Atmospheric Pressure Rotating Cage
This standard is issued under the fixed designation G202; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Significance and Use
1.1 This test method covers a generally accepted procedure 3.1 The rotating cage (RC) test system is relatively inex-
to conduct the rotating cage (RC) experiment under atmo- pensive and uses simple flat specimens that allow replicates to
3
spheric pressure. be run with each setup. (1-11).
1.2 The values stated in SI units are to be regarded as the 3.2 TheRCmethodcanbeusedtoevaluateeithercorrosion
standard. The values given in parentheses are for information inhibitors, or materials, or both. Guide G184 describes the
only. procedure to use rotating cage to evaluate corrosion inhibitors.
1.3 This standard does not purport to address all of the
3.3 In this test method, a general procedure is presented to
safety concerns, if any, associated with its use. It is the
obtain reproducible results using RC to simulate the effects of
responsibility of the user of this standard to establish appro-
different types of coupon materials, inhibitor concentrations,
priate safety and health practices and determine the applica-
oil,gasandbrinecompositions,temperature,andflow.Oilfield
bility of regulatory limitations prior to use.
fluids may often contain sand; however, this test method does
not cover erosive effects that occur when sand is present.
2. Referenced Documents
4. Apparatus
2
2.1 ASTM Standards:
4.1 Fig. 1 shows the schematic diagram of the RC system.
D1141 Practice for the Preparation of Substitute Ocean
The vessel is manufactured from acrylic. At the bottom of the
Water
container, a PTFE base is snugly fitted. At the center of the
D1193 Specification for Reagent Water
base, a hole is drilled, into which the lower end of the rotating
D1293 Test Methods for pH of Water
shaft is placed. This arrangement stabilizes the rotating shaft
E691 Practice for Conducting an Interlaboratory Study to
and the coupons. The length of the rotating shaft between the
Determine the Precision of a Test Method
top and bottom covers is 40 cm (15.7 in.). The rotating cage is
G1 Practice for Preparing, Cleaning, and Evaluating Corro-
attached to the shaft in such a way that the top of the cage is
sion Test Specimens
30 cm (11.8 in.) from the bottom cover.
G16 Guide for Applying Statistics to Analysis of Corrosion
Data
4.2 Eight coupons (each of length 75 mm, width 19 mm,
2
G31 Guide for Laboratory Immersion Corrosion Testing of
thickness 3 mm, and surface area 34.14 cm )) are supported
Metals
betweentwoPTFEdisks(of80-mmdiameter)mounted75mm
G46 Guide for Examination and Evaluation of Pitting Cor-
apartonthestirringrod(Fig.2).Holes(diameter10mm)about
rosion
15 mm away from the center are drilled in the top and bottom
G170 Guide for Evaluating and Qualifying Oilfield and
PTFEplatesofthecagetoincreasetheturbulenceontheinside
Refinery Corrosion Inhibitors in the Laboratory
surface of the coupon (Fig. 3). This experimental setup can be
G184 Practice for Evaluating and Qualifying Oil Field and
used at rotation speeds up to 1000 rpm.
Refinery Corrosion Inhibitors Using Rotating Cage
4.3 Flow patterns inside the RC depend on the rotation
speed, the volume of the container, and the nature of the fluids
used. The flow patterns are described in Guide G170.
1
This test method is under the jurisdiction of ASTM Committee G01 on
Corrosion of Metals and is the direct responsibility of Subcommittee G01.05 on
4.4 Volume of solution to the surface area of the specimen
Laboratory Corrosion Tests.
has some effect on the corrosion rate. The minimum solution
Current edition approved Nov. 1, 2012. Published March 2013. Originally
3 2
volume(cm )tometalsurfacearea(cm )isnotlessthan14cm
approved in 2009. Last previous edition approved in 2009 as G202-09. DOI:
3 2
10.1520/G0202-12. (cm /cm ) (10).
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
3
Standards volume information, refer to the standard’s Document Summary page on The boldface numbers in parentheses refer to a list of references at the end of
the ASTM website. this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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G202 − 12
FIG. 1 Schematic Diagram of Rotating Cage
all reagents conform to the specifications of the Committee on
Analytical Reagents of the
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: G202 − 09 G202 − 12
Standard Test Method for
1
Using Atmospheric Pressure Rotating Cage
This standard is issued under the fixed designation G202; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers a generally accepted procedure to conduct the rotating cage (RC) experiment under atmospheric
pressure.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
D1141 Practice for the Preparation of Substitute Ocean Water
D1193 Specification for Reagent Water
D1293 Test Methods for pH of Water
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
G1 Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens
G16 Guide for Applying Statistics to Analysis of Corrosion Data
G31 Guide for Laboratory Immersion Corrosion Testing of Metals
G46 Guide for Examination and Evaluation of Pitting Corrosion
G170 Guide for Evaluating and Qualifying Oilfield and Refinery Corrosion Inhibitors in the Laboratory
G184 Practice for Evaluating and Qualifying Oil Field and Refinery Corrosion Inhibitors Using Rotating Cage
3. Significance and Use
3.1 The rotating cage (RC) test system is relatively inexpensive system that and uses flat specimens to assess the effect of flow
across a specimen on the corrosion that occurs on the specimen. This system does not produce an easily characterized flow system
but it is adjustable over a wide range of flow rates and uses readily available specimens. simple flat specimens that allow replicates
3
to be run with each setup. (1-11).
3.2 The RC method can be used to evaluate either corrosion inhibitors, or materials, or both. Guide G184 describes the
procedure to use rotating cage to evaluate corrosion inhibitors.
3.3 In this test method, a general procedure is presented to obtain reproducible results using atmospheric pressure RC described
in Guide RC G184to simulate the effects of different types of coupon materials, inhibitor concentrations, oil, gas and solutionbrine
compositions, temperature, and flow. Oil field fluids may often contain sand; however, this test method does not cover erosive
effects that occur when sand is present.
4. Apparatus
4.1 Fig. 1 shows the schematic diagram of the atmospheric pressure RC system. The vessel is manufactured from acrylic. At
the bottom of the container, a polytetrafluoroethylene (PTFE) PTFE base is snugly fitted. Vessel made from other materials may
1
This test method is under the jurisdiction of ASTM Committee G01 on Corrosion of Metals and is the direct responsibility of Subcommittee G01.05 on Laboratory
Corrosion Tests.
Current edition approved Oct. 1, 2009Nov. 1, 2012. Published November 2009March 2013. Originally approved in 2009. Last previous edition approved in 2009 as
G202-09. DOI: 10.1520/G0202-09.10.1520/G0202-12.
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.
3
The boldface numbers in parentheses refer to a list of references at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
Copyright by ASTM Int'l (all rights reserved); Mon Mar 24 16:48:26 EDT 2014
Downloaded/printed by
Bob Dreyfuss (ASTM International) pursuant to License Agreement. No further reproductions authorized.
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G202 − 12
FIG. 1 Schematic Diagram of Rotating Cage
be used provided it is first ascertained that they are compatible with the solutions and gases to be used in the test. At the center
of the base, a hole is drilled, into which the lower end of the rotating shaft is placed. This arrangement stabilizes the rotating shaft
and the coupons. The length of the rotating sha
...
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