NACE-SP0592-2006.pdf
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1、t : i E R : A 7 1 O N A L NACE Standard SPO592-2006 (formerly RP0592-2001) Item No. 21057 Standard Practice Application of a Coating System to Interior Surfaces of New and Used Rail Tank Cars in Concentrated (90 to 98%) Sulfuric Acid Service This NACE International standard represents a consensus of
2、 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 w
3、ith 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 or protecting anyone against
4、 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
5、 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 accord
6、ance 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
7、 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 thi
8、s 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
9、 this standard. CAUTIONARY NOTICE: NACE International standards are subject to periodic review, and may be revised or withdrawn at any time without prior notice. NACE International requires that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of
10、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 Firstservice Department, 1440 South Creek Dr., Houston,
11、Texas 77084-4906 (telephone + I 281228-6200). Reaffirmed 2006-03-15 Reaffirmed 2001-09-12 Approved 1992-04-26 NACE International 1440 South Creek Drive Houston, Texas 77084-4906 + I 281/228-6200 ISBN 1-57590-132-3 O 2006, NACE International Copyright NACE International Provided by IHS under license
12、with NACELicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 19:23:51 MSTNo reproduction or networking permitted without license from IHS -,-,- SPO592-2006 Foreword A large number of commercial 93% sulfuric acid (H2S04) shipments in the United States and Canada are ma
13、de by rail in carbon steel tank cars. Concentrated sulfuric acid is an oxidizing agent and a desiccant. The major problems in its handling and storage relate to its hygroscopic nature (absorption of atmospheric humidity), its exothermic reactivity with water on dilution, and velocity effects that er
14、ode the otherwise protective films of corrosion products. Corrosion rates of approximately 0.25 mm/year (0.01 O in./year) have been measured in static storage tanks and tank cars that haul concentrated sulfuric acid. To cope with this uniform corrosion over a 40-year service life, 10 mm (0.4 in.) of
15、 extra wall thickness would be required on a tank car. The addition of this extra wall thickness would add substantially to the tank cars weight and result in severe reductions in carrying capacity. An even more serious problem is that uniform corrosion is invariably accompanied by severe localized
16、corrosion in the top halves of tank cars. This localized corrosion, called hydrogen grooving, produces deep vertical grooves in localized bands that extend along the sides and across the heads of tank cars. Hydrogen grooves can progress through the steel far more rapidly than uniform corrosion, and
17、can cause substantial damage after short periods of service. Extra wall thickness is not sufficient to cope with hydrogen grooving. Copper-bearing steels also have been used to improve resistance to sulfuric acid corrosion, but this has not been successful. Painting the exterior surfaces of the tank
18、 cars with a heat-reflecting color to keep the acid temperature as low as possible has reduced corrosion rates, but has not eliminated the problem. Anodic protection is another option that is sometimes considered. Industry consensus points to internal coatings as a necessary protective measure for t
19、ank cars transporting concentrated sulfuric acid and to ensure product purity. Many shippers of sulfuric acid apply a protective coating (usually a baked phenolic) to the interior surfaces of tank cars and specify a nominal steel corrosion allowance of 3.2 mm (0.13 in.) in the event of coating failu
20、re. The life expectancies of these coatings are highly dependent on the quality of application. For this reason, the proper application and inspection of interior coatings is very important to the maintenance of tank cars hauling sulfuric acid. This standard practice provides guidelines for the high
21、-quality application, surface preparation, inspection, and testing of coatings for the interior surfaces of rail tank cars handling shipments of concentrated sulfuric acid at ambient temperatures. This NACE standard is intended for use by tank car owners, coating manufacturers, and coating applicato
22、rs for the auditing of the facilities, equipment, and personnel that satisfy the requirements for tank car coating systems in this severe service. This standard was originally developed in 1992 by Task Group (TG) T-14C-1, a component of Unit Committee T-14C on Rail Equipment Corrosion. It was reaffi
23、rmed by STG 43 in 2001 following review by TG 061. TG 061 is administered by Specific Technology Group (STG) 43 on Land Transportation, and sponsored by STG 03 on Protective Coatings and Linings-lmmersion/Buried and STG 36 on Process Industry-Chemicals. It was reaffirmed by STG 43 in 2006, and is is
24、sued 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 of 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
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