1、 Standard Practice Selection and Application of a Coating System to Interior Surfaces of New and Used Rail Tank Cars in Molten Sulfur Service This NACE International standard represents a consensus of those individual members who have reviewed this document, its scope, and provisions. Its acceptance
2、 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 grant
3、ing 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 or protecting anyone against liability for infringement of Letters Patent. This standard represents minimum requirements and sho
4、uld 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 res
5、ponsibility 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 in
6、dividual 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
7、 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
8、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
9、may be revised or withdrawn at any time in accordance with NACE technical committee procedures.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 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, Texas 77084-4906 (telephone +1281228-6200). Revised 2007-03-10 App
11、roved 2002-04-06 NACE International 1440 South Creek Drive Houston, Texas 77084-4906 +1 281/228-6200 ISBN 1-57590-145-5 2007, NACE International NACE SP0302-2007 (formerly RP0302-2002) Item No. 21095 SP0302-2007 NACE International i _ Foreword This standard practice addresses the need for quality ap
12、plication of coatings to the interior surfaces of rail tank cars transporting molten sulfur. It covers surface preparation; selection and application of coating materials; inspection of the completed coating system; and testing using adequate, readily available instruments. This standard provides gu
13、idelines to the builder, owner, shipper, and all those involved in the production and use of rail tank cars intended for the transport of molten sulfur. In addition to adhering to the conditions set forth in this standard, rail tank cars must comply with U.S. Department of Transportation(1)(DOT) spe
14、cifications or Association of American Railroads(2)(AAR) standards. Specification M-10021 required all rail tank cars in molten sulfur service to be inspected and protected by 2003. This standard is not meant to provide a full treatise on corrosion of steel in molten sulfur service because that is a
15、n extensive subject in its own right. The maximum legal life of a railcar is 50 years. Rail tank cars usually do not meet this expectation without special measures and regular maintenance. The life of a rail tank car transporting molten sulfur could be reduced without a protective coating. Industry
16、consensus points to interior coatings as one protective measure for rail tank cars transporting molten sulfur. This standard was originally prepared in 2002 by NACE Task Group (TG) 067 on Interior Protection of Railcars Hauling Sulfur and was revised by TG 067 in 2007. This TG is administered by Spe
17、cific Technology Group (STG) 43 on Land Transportation, and is sponsored by STG 03 on Protective Coatings and LiningsImmersion/Buried. This standard is issued by NACE under the auspices of STG 43. In NACE standards, the terms shall, must, should, and may are used in accordance with the definitions o
18、f these terms in the NACE Publications Style Manual, 4th ed., Paragraph 7.4.1.9. Shall and must are used to state mandatory requirements. The term should is used to state something good and is recommended but is not mandatory. The term may is used to state something considered optional. _ (1)U.S. De
19、partment of Transportation (DOT), 400 7thStreet, SW, Washington, DC 20590. (2)Association of American Railroads (AAR), 50 F Street, NW, Washington, DC 20001-1564. _ SP0302-2007 ii NACE International _ NACE International Standard Practice Selection and Application of a Coating System to Interior Surf
20、aces of New and Used Rail Tank Cars in Molten Sulfur Service Contents 1. General 1 2. Definitions 1 3. Responsibilities of the Contracting Parties 2 4. Surface Preparation for New Cars 3 5. Surface Preparation for Used Cars . 4 6. Testing and Verification of Surface Decontamination for Used Cars 4 7
21、. Coating System Materials . 4 8. Coating Application . 7 9. Completed Coating System. 7 10. Inspection . 8 11. Safety . 8 References 9 Bibliography 9 Appendix A: Essential Facilities and Equipment for Application of a Coating System to the Interior of Rail Tank Cars for Molten Sulfur Service 10 App
22、endix B: Rail Tank Car Coating System Inspection Report Forms 12 FIGURES Figure 1. Test Cell Apparatus 6 _ SP0302-2007 NACE International 1 _ Section 1: General 1.1 This standard describes procedures for the selection, surface preparation, application, and inspection of a coating system used to prot
23、ect the interior surfaces of new and used rail tank cars for transportation of molten sulfur. Appendix A (nonmandatory) describes essential facilities and equipment for the application of a coating system to the interior of rail tank cars. Appendix B (nonmandatory) contains a suggested rail tank car
24、 coating system inspection report form. 1.2 The term “molten sulfur” broadly refers to sulfur in its liquid state. Molten sulfur begins to solidify at temperatures from 110 to 120C (230 to 246F) and is reheated to temperatures from 140 to 150C (284 to 302F) for handling. Factors that could affect co
25、rrosion characteristics include the presence of impurities (ash and carbon), moisture, and gases. 1.3 Liquid coatings used in this standard may be hazardous. Basic safety precautions regarding the handling and application of these materials and solvents shall therefore be used (NACE Publication TPC
26、22contains more detailed information). The material safety data sheet (MSDS) supplied by the coating manufacturer provides additional information relative to the coating and current applicable regulations. _ Section 2: Definitions Car Owner: The person or firm that owns the rail tank car (may also b
27、e the contracting authority). Coat: One layer of a coating applied to a surface in a single continuous application to form a uniform film when dry. Coating: A liquid, liquefiable, or mastic composition that, after application to a surface, is converted into a solid protective, decorative, or functio
28、nal adherent film. For the purpose of this standard, a coating is any type of protective material or materials applied as a liquid in one or more coats to the interior of the rail tank car to act as a barrier between the base metal and the commodity. Coating Applicator: The contracted firm that is e
29、xecuting the work specified. Contracting Authority: The person or firm responsible for the approval and purchase of a completed rail tank car coating system. Discontinuity: A void, crack, thin spot, foreign inclusion, or contamination in a coating that significantly lowers its electrical resistance.
30、 It may also be identified as a holiday or pinhole. Holiday: A discontinuity in a protective coating that exposes unprotected surface to the environment. Holiday Detector: A device that locates discontinuities in a coating applied to a conductive surface. Inspector: A person employed to understand t
31、he applicable specifications and to enforce and ensure the specifications are met and documented, using the necessary instruments and standards as designated by the employer. Interior Coating: Any type of protective material or materials applied as a liquid in one or more coats to the interior of th
32、e rail tank car to act as a barrier between the base metal and the commodity. Lining: A coating or layer of sheet material adhered to or in intimate contact with the interior surface of a container used to protect the container against corrosion by its contents and/or to protect the contents of the
33、container from contamination by the container material. Measurement: An average of three or more film thickness readings for a coating. Pinhole: A coating defect characterized by a small pore-like flaw, which, when extended entirely through the film, appears as a discontinuity. A pinhole in a single
34、 coat of a multicoat system may not indicate a discontinuity. Pit: A single location within a corroded area that takes the form of a cavity. Pitting: Localized corrosion of a metal surface that is confined to a small area and takes the form of cavities called pits. Quality Assurance: Those planned a
35、nd systematic actions necessary to provide specified documentation and adequate confidence that the rail tank car coating system will perform satisfactorily in service. Quality Control: Those quality assurance actions related to the physical characteristics of the entire coating systems application
36、as a means of providing compliance with specified requirements. Reading: A single film thickness gauge determination of a coating. SP0302-2007 2 NACE International Rust Bloom: Discoloration indicating the beginning of rusting.Shelf Life: Maximum length of time that a coating can be stored (in a seal
37、ed container at a temperature range specified by the coating supplier) before application. _ Section 3: Responsibilities of the Contracting Parties 3.1 Contracting Authority 3.1.1 An inspection of the coating applicators facilities and equipment should be conducted before the coating project is sent
38、 out for bids. 3.1.2 A prejob conference may be scheduled prior to beginning the coating work. The prejob conference should include representatives of the contracting authority, inspector, coating manufacturer, and coating applicator. 3.1.3 This standard shall be reviewed along with any other relate
39、d specifications at the prejob conference. Any points of potential misunderstanding regarding pertinent standards shall be clarified. 3.1.4 Inspection forms shall be approved by the contracting authority. 3.1.5 Quality assurance shall be the responsibility of the contracting authority. 3.1.6 The con
40、tracting authority shall provide to the coating applicator in writing any information regarding the last consignment carried in the rail tank car to be coated that is deemed essential for the coating applicator to know in order to allow for safe entry and to prepare the surface properly for applicat
41、ion of a coating system. 3.1.7 The contracting authority, in consultation with the coating manufacturer, shall specify the type of coating, the color, the level of surface preparation, the number of coats to be applied, and the minimum and maximum allowable film thickness for each coating. 3.2 Coati
42、ng Applicator 3.2.1 The quality control supervisor and responsible shop supervisory personnel directly involved in the coating application shall be present at the prejob conference scheduled by the contracting authority. 3.2.2 Quality control shall be the responsibility of the coating applicator. 3.
43、2.3 Authorized shop personnel and representatives of the contracting authority shall have suitable access to all areas where work is in progress on the subject rail tank car. 3.2.4 The coating applicator shall ensure that the work is being performed in compliance with all applicable AAR and other re
44、gulations. 3.2.5 Subject to all applicable regulations, the coating applicator is responsible for personnel safety in the handling, application, and disposal of the specified coatings. A current MSDS for each component of a coating system to be applied shall be retained on file and made available, i
45、n accordance with applicable regulations, to each person using the materials. 3.2.6 Current surface preparation and coating application instructions shall be retained at the application site. 3.2.7 The coating applicator shall forward the completed inspection forms to the contracting authority and r
46、etain a copy on file for a minimum of one year for each coating system installation. 3.2.8 The coating applicator shall inform both the contracting authority and the coating manufacturer if an application problem arises that significantly affects the quality of the finished coating system. 3.2.9 If
47、the coating applicator is inexperienced or unfamiliar with the specified coating system, the coating applicator shall obtain technical assistance from the coating manufacturer. 3.2.10 The contracting authority shall approve all metal repairs to the interior of the rail tank car. All AAR and DOT requ
48、irements for such repairs shall be met. 3.2.11 The only materials added to the coating (such as thinners) shall be those recommended by the coating manufacturer. 3.2.12 Documentation shall be maintained verifying shop personnel qualifications for preparation and application of interior coatings. 3.3 Coating Manufacturer 3.3.1 Technical assistance for application prob
