CoatingsPro Magazine

JAN 2009

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Page 13 of 107

COATINGS NEWS FROM NACE INTERNATIONAL NACE Publishes New Standard on Measurement of Soluble Salts Netherlands), recently completed NACE SP0508-2008, "Methods of Validating Equivalence to ISO 8502-9 on Measurement of the Levels of Soluble Salts," in a record 10 months. N The standard was begun at the request of members of the interna- tional shipbuilding industry who must comply with the International Maritime Organization (IMO) Protective Coatings Performance Standard (PSPC). The PSPC requires testing for soluble salts following the method in ISO 8502-9.(1) ISO 8502-9 specifies the use of the Bresle patch method of extracting soluble salts found in ISO 8502-6.2(2) The level of salts is then measured using a conductivity gauge, and a mathematical conversion of the conductivity provides a total salt weight value. The standard provides a way to establish equivalence by testing and comparing results of the tests to meet established criteria providing the same values as using the method specified in ISO 8502-9. According to Eliasson, this method "revolutionized the issue of salt contamination by defining a standardized method of measuring, meaning differ- ent parties in the field could agree on a common value. The ISO 8502-9 method is time-consuming, and it is possible (1) "Preparation of steel substrates before ap- plication of paints and related products — Tests for the assessment of surface cleanliness — Part 9: Field method for the conductometric deter- mination of water-soluble salts" (latest revision) (Geneva, Switzerland: International Organiza- tion for Standardization [ISO]). (2) "Preparation of steel substrates before appli- cation of paints and related products — Tests for the assessment of surface cleanliness — Part 6: Extraction of soluble contaminants for analysis — The Bresle method" (latest revision) (Geneva, Switzerland: ISO). 14 CoatingsPro J January 2009 ACE International Task Group 392, led by Johnny Eliasson (Stolt Tankers B.V, Rotterdam, The that easier, faster, and even more reliable methods are available." To establish equivalence, the alterna- tive method must measure the same thing; alternative test method suppliers will be required to perform equivalence testing to show this is the case. In general terms, the equivalence testing involves the following: 1. Selecting an appropriate method of doping (contaminating) the test panels. a. The standard specifies requirements for the surface condition of the panels, the composition of the doping (salt) solutions, and the measured concentration of salts on the surface. The specific method employed to meet those crite- ria is left up to the laboratory to determine. There is, however, a suggested method in Appendix C of the standard. 2. Demonstrating the effectiveness of the doping (test plate contamination) method by testing following the ISO 8502-9 procedure. a. The standard specifies statisti- cal requirements for the results of testing using the ISO 8502-9 method. b. The panels are to be doped (contaminated) in such a way that the average of measured readings is as close to 50 mg/m2 as possible. 3. Testing the proposed method for equivalence to ISO 8502-9. Once the baseline ISO 8502-9 a. results are established, the candidate method is tested on panels prepared in the same way as those used for the ISO 8502-9 baseline. 4. Comparing the results to ensure they are within specified limits. The standard specifies statistical a. limits for the results to be deemed equivalent to ISO 8502-9. While there is no one specific procedure mandated for equivalence testing, the standard specifies several requirements that must be met. These requirements for the test procedure and resultant test data (average, standard deviation, and range) are based on testing carried out in an independent laboratory with NACE supervision. A "Best Practice" guide on how to use this standard — in clear but less scien- tific language — is being developed to aid laboratory engineers around the world. One of the benefits of NACE membership is free downloads of all NACE standards and reports. For more informa- tion, visit or contact the NACE FirstService Department at (281) 228-6223 or CP NACE SP0508-2008 Item No. 21134 Standard Practice Methods of Validating Equivalence to ISO 8502-9 on Measurement of the Levels of Soluble Salts 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 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 International standard is to be construed as granting any right, by implication or otherwise, to manufacture, sell, or use in connection with any method, apparatus, or product covered by Letters patent, or as indemnifying ore 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 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 International assumes no responsibility for the interpretation or use of this standard by other 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 are 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 environmental 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 appropriate 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 technical 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. The user is cautioned to obtain the latest edition. Purchasers of NACE International standards may receive current information on all standards and other NACE International publications by contacting the NACE International First Service Department, 1440 South Creek Dr., Houston, Texas 77084-4907 (telephone +1 281-228-6200). Approved 2008-11-07 NACE International 1440 South Creek Dr. Houston, Texas 77084-4906 +1 281-228-6200 ISBN 1-57590-222-2 © 2008, NACE International

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