ANSI NACE SP0502-2010 Pipeline External Corrosion Direct Assessment Methodology (Item No 21097)《管道外部腐蚀直接评价方法》.pdf
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1、 Standard Practice Pipeline External Corrosion Direct Assessment Methodology This NACE International standard represents a consensus of those individual members who have reviewed this document, its scope, and provisions. Its acceptance does not in any respect preclude anyone, whether he or she has a
2、dopted the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not in conformance with this standard. Nothing contained in this NACE International standard is to be construed as granting any right, by implication or otherwise, to manufacture, sell,
3、 or use in connection with any method, apparatus, or product covered by Letters Patent, or as indemnifying or protecting anyone against liability for infringement of Letters Patent. This standard represents minimum requirements and should in no way be interpreted as a restriction on the use of bette
4、r procedures or materials. Neither is this standard intended to apply in all cases relating to the subject. Unpredictable circumstances may negate the usefulness of this standard in specific instances. NACE International assumes no responsibility for the interpretation or use of this standard by oth
5、er parties and accepts responsibility for only those official NACE International interpretations issued by NACE International in accordance with its governing procedures and policies which preclude the issuance of interpretations by individual volunteers. Users of this NACE International standard ar
6、e responsible for reviewing appropriate health, safety, environmental, and regulatory documents and for determining their applicability in relation to this standard prior to its use. This NACE International standard may not necessarily address all potential health and safety problems or environmenta
7、l hazards associated with the use of materials, equipment, and/or operations detailed or referred to within this standard. Users of this NACE International standard are also responsible for establishing appropriate health, safety, and environmental protection practices, in consultation with appropri
8、ate regulatory authorities if necessary, to achieve compliance with any existing applicable regulatory requirements prior to the use of this standard. CAUTIONARY NOTICE: NACE International standards are subject to periodic review, and may be revised or withdrawn at any time in accordance with NACE t
9、echnical committee procedures. NACE International requires that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of initial publication and subsequently from the date of each reaffirmation or revision. The user is cautioned to obtain the latest ed
10、ition. Purchasers of NACE International standards may receive current information on all standards and other NACE International publications by contacting the NACE International FirstService Department, 1440 South Creek Dr., Houston, TX 77084-4906 (telephone +1 281-228-6200). ANSI/NACE SP0502-2010 I
11、tem No. 21097 Revised 2010-06-24 Reaffirmed 2008-03-20 Approved 2002-10-11 NACE International 1440 South Creek Dr. Houston, Texas 77084-4906 +1 281-228-6200 ISBN 1-57590-156-0 2010, NACE International An American National Standard Approved December 3, 2010 ANSI/NACE SP0502-2010 NACE International i
12、_ Foreword External corrosion direct assessment (ECDA) is a structured process that is intended to improve safety by assessing and reducing the impact of external corrosion on pipeline integrity. By identifying and addressing corrosion activity, repairing corrosion defects, and remediating the cause
13、, ECDA proactively seeks to prevent external corrosion defects from growing to a size that is large enough to affect structural integrity. ECDA as described in this standard practice is specifically intended to address buried onshore pipelines constructed from ferrous materials. Other methods of add
14、ressing external corrosion on onshore ferrous pipelines, such as pressure testing and in-line inspection (ILI), are not covered in this standard but are covered in other industry standards. Users of this standard must be familiar with all applicable pipeline safety regulations for the jurisdiction i
15、n which the pipeline operates. This includes all regulations requiring specific pipeline integrity assessment practices and programs. This standard is intended for use by pipeline operators and others who must manage pipeline integrity. ECDA is a continuous improvement process. Through successive EC
16、DA applications, a pipeline operator should be able to identify and address locations at which corrosion activity has occurred, is occurring, or may occur. One of the advantages of ECDA is that it can locate areas where defects could form in the future rather than only areas where defects have alrea
17、dy formed. Pipeline operators have historically managed external corrosion using some of the ECDA tools and techniques. Often, data from aboveground inspection tools have been used to locate areas that may be experiencing external corrosion. The ECDA process takes this practice several steps forward
18、 and integrates information on a pipelines physical characteristics and operating history (preassessment) with data from multiple field examinations (indirect inspection) and pipe surface evaluations (direct examination) to provide a more comprehensive integrity evaluation with respect to external c
19、orrosion (postassessment). This standard was originally prepared in 2002 by Task Group (TG) 041, “Pipeline Direct Assessment Methodology.” It was reaffirmed in 2008 by Specific Technology Group (STG) 35, “Pipelines, Tanks, and Well Casings,” and revised in 2010 by TG 041. This standard is issued by
20、NACE International under the auspices of STG 35. In NACE standards, the terms shall, must, should, and may are used in accordance with the definitions of these terms in the NACE Publications Style Manual. The terms shall and must are used to state a requirement, and are considered mandatory. The ter
21、m should is used to state something good and is recommended, but is not considered mandatory. The term may is used to state something considered optional. _ ANSI/NACE SP0502-2010 ii NACE International _ NACE International Standard Practice Pipeline External Corrosion Direct Assessment Methodology Co
22、ntents 1. General 1 2. Definitions 6 3. Preassessment 9 4. Indirect Inspection . 18 5. Direct Examination 23 6. Post Assessment . 30 7. ECDA Records 36 References 38 Bibliography 39 Appendix A: Direct ExaminationData Collection Methods Before Coating Removal (Nonmandatory) . 40 Appendix B: Direct Ex
23、aminationCoating Damage and Corrosion Depth Measurements (Nonmandatory) . 47 Appendix C: PostassessmentCorrosion Rate Estimation (Nonmandatory) 50 FIGURES Figure 1(a)External Corrosion Direct Assessment FlowchartPart 1 4 Figure 1(b)External Corrosion Direct Assessment FlowchartPart 2 5 Figure 2Preas
24、sessment Step 9 Figure 3Example Selection of Indirect Inspection Tools . 17 Figure 4Example Definitions of ECDA Regions 18 Figure 5Indirect Inspection Step 20 Figure 6Direct Examination Step . 24 Figure 7Postassessment Step 32 Figure A1Four-Pin Method with Voltmeter and Ammeter . 41 Figure A2Four-Pi
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