1、 Joint Standard NACE/PODS Standard Practice External Corrosion Direct Assessment (ECDA) Integrity Data Exchange (IDX) 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
2、 preclude anyone, whether he or she has adopted 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 standard is to be construed as granting any right, by implication or other
3、wise, to manufacture, sell, 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 rest
4、riction on the use of better 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 assumes no responsibility for the interpretation or use of this st
5、andard by other parties and accepts responsibility for only those official NACE interpretations issued by NACE in accordance with its governing procedures and policies which preclude the issuance of interpretations by individual volunteers. Users of this NACE standard are responsible for reviewing a
6、ppropriate health, safety, environmental, and regulatory documents and for determining their applicability in relation to this standard prior to its use. This NACE standard may not necessarily address all potential health and safety problems or environmental hazards associated with the use of materi
7、als, equipment, and/or operations detailed or referred to within this standard. Users of this NACE standard are also responsible for establishing appropriate health, safety, and environmental protection practices, in consultation with appropriate regulatory authorities if necessary, to achieve compl
8、iance with any existing applicable regulatory requirements prior to the use of this standard. CAUTIONARY NOTICE: NACE standards are subject to periodic review, and may be revised or withdrawn at any time in accordance with NACE technical committee procedures. NACE requires that action be taken to re
9、affirm, 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 edition. Purchasers of NACE standards may receive current information on all standards
10、and other NACE publications by contacting the NACE FirstService Department, 15835 Park Ten Place, Houston, TX 77084-5145 (telephone +1 281-228-6200). Revised 2014-03-08 Approved 2007-11-05 ISBN 1-57590-213-3 2014, NACE International and PODSNACE International 15835 Park Ten Place Houston, Texas 7708
11、4-5145 +1 281-228-6200 PODS Association, P.O. Box 273084 Fort Collins, Colorado 80527 +1 866-460-7637 Printed by NACE International SP0507-2014 Item No. 21124 SP0507-2014 NACE International i _ Foreword The objective of this standard practice is the development of a new external corrosion direct ass
12、essment (ECDA) data interchange data structure that will enable electronic integration of data and standardize reporting of ECDA data associated with indirect inspection data within the pipeline industry, to allow transfer between different software packages or computer systems. This is expected to
13、minimize difficulty in using various programs to analyze or graph data and allow for comparison of data gathered for a given pipeline segment at different times, regardless of the software system used to collect it. The format outlined is the commonly used American Standard Code for Information Inte
14、rchange (ASCII) comma delimited text file, which is adaptable to all data processing systems. This standard is expected to serve as a template for future internal corrosion direct assessment (ICDA) and stress corrosion cracking direct assessment (SCCDA) data interchange standards. It presents one su
15、ggested exchange format to standardize data transfer. Data collection and testing procedures shall conform to NACE SP0207, “Performing Close-Interval Potential Surveys on Buried or Submerged Metallic Pipelines,”1NACE Standard TM0109, “Aboveground Survey Techniques for the Evaluation of Underground P
16、ipeline Coating Condition,”2NACE SP0169,3and other applicable recommended NACE standards for accurate ECDA pipeline integrity data. This standard is intended for use by corrosion control personnel and information technology professionals involved with acquiring, analyzing, or maintaining ECDA data,
17、contractors performing ECDA, and regulatory agencies. For accurate and correct application, this standard must be used in its entirety. Using or citing only specific paragraphs or sections can lead to misinterpretation and misapplication of the recommendations and practices presented. Specific pract
18、ices are not designated for every situation because of the complexity of conditions to which buried or submerged piping systems are exposed. This standard was prepared by joint Task Group (TG) 357 on External Corrosion Direct Assessment (ECDA) Integrity Data Exchange (IDX) in 2007 and was revised by
19、 TG 357 in 2014. TG 357 is administered by Specific Technology Group (STG) 35 on Pipelines, Tanks, and Well Casings. This standard is issued by NACE International under the auspices of STG 35, and the Pipeline Open Data Systems (PODS) Association.(1)In NACE standards, the terms shall, must, should,
20、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 term should is used to state something good and is recommended, but is not considered mandatory. The t
21、erm may is used to state something considered optional. _ (1)Pipeline Open Data Systems (PODS) Association, P.O. Box 273084, Fort Collins, CO 80527. SP0507-2014 ii NACE International _ Joint Standard NACE/PODS Standard Practice External Corrosion Direct Assessment (ECDA) Integrity Data Exchange (IDX
22、) Contents 1. General 1 2. Definitions 1 3. Common Data Format . 5 4. Centerline Survey Data Format. 14 5. Close-Interval Survey Data Format . 16 6. ECDA_RECTIFIER Table . 20 7. Aboveground Coating Evaluation Survey Data Format 23 8. Environment Survey Data Format . 30 References 32 Appendix A: Inte
23、rpreting an Entity Relationship Diagram 33 Figure 1: Example Entity Relationship Diagram (ERD) for an ECDA IDX Database 7 TABLES Table 1: ECDA Inspection Range Table 8 Table 2: ECDA Region Table . 11 Table 3: ECDA Survey Run Table . 12 Table 4: ECDA Centerline Table 14 Table 5: ECDA CIS Table 16 Tab
24、le 6: ECDA Rectifier Table . 20 Table 7: ECDA DCVG/ACVG Table 24 Table 8: ECDA ACA Table . 26 Table 9: ECDA Pearson Table . 28 Table 10: ECDA Environment Table 30 _ SP0507-2014 NACE International 1 _ Section 1: General 1.1 Introduction 1.1.1 This standard defines the requirements for a data format s
25、uitable for ECDA integrity data management. A standardized format assures accurate data transfer between contractor and operator databases in formats that are convenient and familiar to each. Such standardization accommodates industry-wide data mining and facilitates review by regulatory agencies. 1
26、.1.2 ECDA-related data elements to cover a wide variety of data capture needs are presented. Not all fields are mandatory in all applications. The purpose of this standard is to provide a standard field naming and unit format convention (i.e., data dictionary) for using the various ECDA indirect ins
27、pection data elements. 1.1.3 This standard presents an open format that is intended to accommodate the widest probable range of variables that might be mandatory to document an ECDA survey and subsequent investigation. It is not necessary to enter data or comments in all of the data fieldsonly those
28、 applicable to the current study or those necessary to meet operator requirements. This format also acts as a checklist to remind the surveyor(s) of information to be gathered. 1.2 Scope 1.2.1 This standard addresses ECDA indirect inspection data, including close-interval surveys (CIS), aboveground
29、coating evaluation surveys (e.g., direct-current voltage gradient DCVG and Pearson survey), and corrosiveness of environment surveys (e.g., linear polarization resistance LPR probe surveys and pH/soil resistivity surveys). 1.2.2 This standard does not address specific procedures for performing surve
30、ys, validating, or interpreting indirect inspection data. 1.2.3 Sound engineering practice and common sense should be used to assure that survey data are valid. Error checks should be made at regular intervals to ensure the quality of data recorded and stored. 1.2.4 Some users may not find it applic
31、able to their use. 1.3 Benefits 1.3.1 The use of common field names allows users (vendors and operators) to exchange data in a predictable and reliable manner without the need for custom data conversion. This minimizes the risk of data translation errors. 1.3.2 The use of a common exchange format al
32、lows operators to use various vendors without the need for multiple data transformation concerns. 1.3.3 A common data exchange format should enable more industry ECDA-related applications to be developed. 1.3.4 These benefits may be realized in a similar fashion as has the in-line inspection (ILI) d
33、ata exchange standard.4An operator may validate ILI survey data prior to formally accepting the survey from the vendor, and load it to an enterprise database for electronic integration and alignment with the operators common linear reference. Realignment may take place nightly or at another desired
34、frequency, keeping the survey synchronized with pipeline reroutes and other changes to pipe length. This in turn enables reclassification of anomalies as changes that require reclassification are detected. Costs of manual integration for an annual risk ranking are eliminated. _ Section 2: Definition
35、s Aboveground Coating Evaluation Survey: Method to assess the coating condition of an underground pipeline. Aboveground Marker (AGM): A portable or permanently installed device placed on the surface above a pipeline that both detects and records the passage of an ILI tool or transmits a signal that
36、is detected and recorded by the tool. SP0507-2014 2 NACE International Anomaly: A deviation from the norm in pipe material, coatings, or welds. Alternating Current Voltage Gradient (ACVG): A method of measuring the change in leakage current in the soil along and around a pipeline to locate coating h
37、olidays. Ascending: In the direction of increasing stationing. Ascending Survey: A survey performed in the direction of increasing stationing. ASCII: American Standard Code for Information Interchange. A standardized eight-bit code used by most computers. Cathodic Protection (CP): A technique to red
38、uce the corrosion rate of a metal surface by making that surface the cathode of an electrochemical cell. Cell-to-Cell Survey: A survey measuring the potential difference between two reference electrodes. Cell-to-cell surveys include alternating-current voltage gradient (ACVG), DCVG, side-drain, and
39、hot-spot surveys. Close-Interval Potential Survey (CIPS) (also Close-Interval Survey CIS): A series of structure-to-electrolyte direct current (DC) potential measurements performed at regular intervals for assessing the level of cathodic protection (CP) on pipelines and other buried or submerged met
40、allic structures. Coating: A liquid, liquefiable, or mastic composition that, after application to the surface, is converted into a solid protective, decorative, or functional adherent film. For the purposes of this standard, coating refers to a dielectric material applied to a structure to separate
41、 it from the environment. Coating Condition Classification: Ranking of the coating quality based on the number of coating holidays per unit length or electrical conductance of the coating. Current Interrupter: A device that interrupts CP current. Data Element: An individual field or column that hold
42、s a set of values that describe an attribute. Examples are pipe material, pipeline ID, anomaly type, and manufacturer name. Database: An organized body of related information stored in tables of rows (records) and columns (fields). Delimited: Items of data separated by a character, pulse, bit, etc.,
43、 called a delimiter. Depolarization: The removal of factors resisting the current in an electrochemical cell. For the purposes of this standard, depolarization refers to a reduction in the level of protection due to a reduction or elimination of CP current. Descending: In the direction of decreasing
44、 stationing. Differential Global Positioning System (DGPS): Global positioning system (GPS) using differential error correction in order to obtain more accurate positioning. Direct-Current Voltage Gradient (DCVG) Survey: A method of measuring the change in the electrical voltage gradient in the soil
45、 along and around the pipeline to locate coating holidays. Electrical Connection: Metallic connection between structure and the measurement circuit. Electrode: A material that conducts electrons, is used to establish contact with an electrolyte, and through which current is transferred to or from an
46、 electrolyte. Enterprise Geographical Information System (GIS): A shared central geodatabase that allows integration and dynamic updating of multiple GIS data sources. Field: See Data Element. Field Comments: Comments entered by the surveyor during the CIS. Flag: A pin flag, or the interval that the
47、 flag represents, generally 30 m (100 ft). SP0507-2014 NACE International 3 Flat File: A file not linked to any other file. Format: The specific arrangement of data to meet established presentation requirements. Geodatabase: Short for geographic database, a physical store of geographic information i
48、nside a linked database. Geoid: The particular equipotential surface that coincides with mean sea level (MSL) and that may be imagined to extend through the continents. This surface is everywhere perpendicular to the force of gravity. Global Positioning System (GPS): The navigational system using satellite technology to provide a user a position on the earths surface. Header Information: Set of comments, measurements, and other information enter
