1、NSF International Standard / American National StandardNSF/ANSI 372 - 2016Drinking Water System Components -Lead Content NSF International, an independent, not-for-profit, non-governmental organization, is dedicated to being the leading global provider of public health and safety-based risk manageme
2、nt solutions while serving the interests of all stakeholders. This Standard is subject to revision. Contact NSF to confirm this revision is current. Users of this Standard may request clarifications and interpretations, or propose revisions by contacting: Chair, Joint Committee on Drinking Water Add
3、itives c/o NSF International 789 North Dixboro Road, P. O. Box 130140 Ann Arbor, Michigan 48113-0140 USA Phone: (734) 769-8010 Telex: 753215 NSF INTL FAX: (734) 769-0109 E-mail: infonsf.org Web: http:/www.nsf.orgi NSF/ANSI 372 2016 NSF International Standard/ American National Standard Drinking wate
4、r system components Lead content Standard Developer NSF International NSF International Board of Directors Designated as an ANSI Standard March 25, 2016 American National Standards Institute ii Prepared by The NSF Joint Committee on Drinking Water Additives Recommended for Adoption by The NSF Counci
5、l of Public Health Consultants Adopted October 2010 Revised July 2011 Revised March 2016 Published by NSF International P.O. Box 130140, Ann Arbor, Michigan 48113-0140, USA For ordering copies or for making inquiries with regard to this Standard, please reference the designation “NSF/ANSI 372 - 2016
6、.” Copyright 2016 NSF International Previous editions 2012, 2011 Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from NSF International. Pr
7、inted in the United States of America. iii Disclaimers1 NSF, in performing its functions in accordance with its objectives, does not assume or undertake to discharge any responsibility of the manufacturer or any other party. The opinions and findings of NSF represent its professional judgment. NSF s
8、hall not be responsible to anyone for the use of or reliance upon this Standard by anyone. NSF shall not incur any obligation or liability for damages, including consequential damages, arising out of or in connection with the use, interpretation of, or reliance upon this Standard. NSF Standards prov
9、ide basic criteria to promote sanitation and protection of the public health. Provisions for mechanical and electrical safety have not been included in this Standard because governmental agencies or other national standards-setting organizations provide safety requirements. Participation in NSF Stan
10、dards development activities by regulatory agency representatives (federal, local, state) shall not constitute their agencys endorsement of NSF or any of its Standards. Preference is given to the use of performance criteria measurable by examination or testing in NSF Standards development when such
11、performance criteria may reasonably be used in lieu of design, materials, or construction criteria. The illustrations, if provided, are intended to assist in understanding their adjacent standard requirements. However, the illustrations may not include all requirements for a specific product or unit
12、, nor do they show the only method of fabricating such arrangements. Such partial drawings shall not be used to justify improper or incomplete design and construction. Unless otherwise referenced, the annexes are not considered an integral part of NSF Standards. The annexes are provided as general g
13、uidelines to the manufacturer, regulatory agency, user, or certifying organization. 1 The information contained in this Disclaimer is not part of this American National Standard (ANS) and has not been processed in accordance with ANSIs requirements for an ANS. Therefore, this Disclaimer may contain
14、material that has not been subjected to public review or a consensus process. In addition, it does not contain requirements necessary for conformance to the Standard. This page is intentionally left blank.v Contents 1 Purpose, scope, and normative references . 1 1.1 Purpose 1 1.2 Scope . 1 1.3 Norma
15、tive references . 1 1.4 Significant figures . 2 2 Definitions 2 3 General requirements 2 3.1 All components 0.25% . 2 3.2 Any components 0.25% . 2 3.3 Restriction on the use of lead containing materials 2 4 Weighted average lead content calculation . 2 4.1 Component surface areas and lead content 2
16、4.2 Formula for determining weighted average lead content . 3 5 Percentage lead content of water contact surfaces . 3 5.1 Liners . 3 5.2 Coatings . 3 5.3 Lead removal technologies . 3 6 Lead content verification testing . 4 6.1 Lead content testing . 4 7 Analytical procedures for determining percent
17、 lead content of materials . 4 7.1 Lead content screening 4 7.2 Lead content analysis of materials 5 Annex A . A1 This page is intentionally left blank. vii Foreword2 This Standard, NSF/ANSI 372 Drinking water system components Lead Content is the third in a series of standards developed by the NSF
18、Joint Committees on Drinking Water Additives. The other two Standards for drinking water additives products are NSF/ANSI 60 Drinking water treatment chemicals Health effects, which addresses drinking water treatment chemicals (also known as direct additives) and NSF/ANSI 61 Drinking water system com
19、ponents Health effects , which covers products and materials that contact drinking water (also known as indirect additives). Prior to being developed as NSF/ANSI 372, part of the content of this Standard was established as NSF/ANSI 61, Annex G Weighed average lead content evaluation procedure to a 0
20、.25% lead requirement. Annex G was developed by the NSF Drinking Water Additives Task Group on Lead and approved by the NSF Joint Committee on Drinking Water Additives System Components for addition to NSF/ANSI 61 in 2008. The impetus for creating Annex G was the promulgation of individual state reg
21、ulatory requirements limiting the amount of lead that may be contained in products contacting drinking water. While Annex G was an optional evaluation method within NSF/ANSI 61, it required that products also meet the chemical extraction requirements of NSF/ANSI 61, and it was limited in application
22、 to drinking water products that were included within the Scope of ANSI/NSF 61. The NSF Joint Committee on Drinking Water Additives System Components determined that creation of a separate standard addressing lead content requirements would provide greater flexibility in the application of the lead
23、content requirements to the marketplace and to organizations seeking to reference such requirements. While NSF/ANSI 61 establishes limits for the amount of lead that may migrate into drinking water from the water contact materials within a drinking water contact product, NSF/ANSI 372 establishes a l
24、imit on the amount of lead that may be contained within the water contact materials in a drinking water contact product. This Standard also defines a test methodology for the analytical determination of the lead content of materials in these products. NSF/ANSI 372 may be used in conjunction with NSF
25、/ANSI 61 for the purpose of minimizing lead from drinking water products. NSF/ANSI 372 may also be used in conjunction with other standards addressing products that are not included in the Scope of NSF/ANSI 61, such as the NSF Drinking Water Treatment Unit Standards. The Standard can also be used to
26、 demonstrate compliance with individual jurisdictional or contractual requirements that include lead content restrictions on drinking water contact products. NSF/ANSI 372 does not include product performance requirements that are currently addressed in other voluntary consensus standards established
27、 by such organizations as the American Water Works Association, the American Society for Testing and Materials, and the American Society of Mechanical Engineers. Because this Standard complements the performance standards of these organizations, it is recommended that products also meet the appropri
28、ate performance requirements specified in the standards of such organizations. This Standard and the accompanying text are intended for voluntary use by certifying organizations, utilities, regulatory agencies, and/or manufacturers as a basis of providing assurances that adequate health protection e
29、xists for covered products. Product certification issues, including frequency of testing and requirements for follow-up testing, evaluation, enforcement, and other policy issues, are not addressed by this Standard. 2 The information contained in this Foreword is not part of this American National St
30、andard (ANS) and has not been processed in accordance with ANSIs requirements for an ANS. Therefore, this Foreword may contain material that has not been subjected to public review or a consensus process. In addition, it does not contain requirements necessary for conformance to the Standard. viii T
31、his edition of the Standard contains the following revisions: Issue 4 This revision updates applicable normative references under section 1.3. This Standard was developed by the NSF Joint Committee on Drinking Water Additives System Compo-nents using the consensus process described by the American N
32、ational Standards Institute. Suggestions for improvement of this Standard are welcome. Comments should be sent to Chair, Joint Committee on Drinking Water Additives System Components at standardsnsf.org, or c/o NSF International, Standards Department, P.O. Box 130140, Ann Arbor, Michigan 48113-0140,
33、 USA. 1 2016 NSF NSF/ANSI 372 2016 NSF/ANSI Standard for Drinking Water Additives Drinking water system components - Lead content 1 Purpose, scope, and normative references 1.1 Purpose This standard establishes procedures for the determination of lead content based on the wetted surface areas of pro
34、ducts. 1.2 Scope This standard applies to any drinking water system component that conveys or dispenses water for human consumption through drinking or cooking. 1.3 Normative references The following documents contain requirements that, by reference in this text, constitute requirements of this Stan
35、dard. At the time this Standard was balloted, the editions listed below were valid. All documents are subject to revision, and parties are encouraged to investigate the possibility of applying the recent editions of the documents indicated below. The most recent published edition of the document sha
36、ll be used for undated references. ASTM E29-13. Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications3 ASTM E255-07 (2014). Standard Practice for Sampling Copper and Copper Alloys for the Determination of Chemical Composition3 EPA SW 846 Test Method
37、s for Evaluating Solid Waste, Physical Chemical Methods, Method 3050 B Acid Digestion of Sediments, Sludges, and Soils 4 EPA SW846, Method 3052 - Microwave Assisted Acid Digestion of Siliceous and Organically Based Matrices4 EPA SW 846, Method 6010C Inductively Coupled Plasma-Atomic Emission Spectro
38、metry4 Safe Drinking Water Act4 3 ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2859 . 4 Environmental Protection Agency, Environmental Monitoring and Support Laboratory, Cincinnati, OH 45268 . 2016 NSF NSF/ANSI 372 2016 2 1.4 Significant figures For determining conformance
39、with the specifications in this standard, the Rounding Method in ASTM E293 shall be used. 2 Definitions 2.1 coating: A covering or barrier applied to a substrate by electro, chemical deposition or via mechanical adhesion (paint). 2.2 liner: A barrier component which is mechanically attached and seal
40、ed to prevent water contact with another component. (Example: a tubular or cast brass spout with a thermoplastic sleeve inserted inside and sealed with an o-ring or other sealing material, such that water does not come into contact with the brass spout material.) 3 General requirements Solders and f
41、luxes shall have a lead content less than or equal to 0.2%. All other products shall have a weighted average lead content less than or equal to 0.25% based on the average of their wetted surface areas. 3.1 All components 0.25% If each component of a product has a wetted surface with a lead content o
42、f not more than 0.25%, then the product is considered compliant and no further evaluation is required. 3.2 Any components 0.25% If any wetted components of a product has a surface area with a lead content of more than 0.25% lead, then the weighted average lead content shall be calculated according t
43、o section 4 to determine compliance. 3.3 Restriction on the use of lead containing materials There shall be no lead added as an intentional ingredient in any product, component, material, or their coatings submitted for evaluation to this standard with the exception of brass or bronze meeting the de
44、finition of “lead free” under the specific provisions of the Safe Drinking Water Act4 of the United States. 4 Weighted average lead content calculation The weighted average lead content of the product shall be calculated using the surface area and lead content information established under section 4
45、.1. For internal NPT (pipe) threads, engagement of male components into female threads will assume that 25% of the length of the female thread remains exposed as wetted surface area. All of the wetted surfaces are to be included in the weighted average lead content calculation, not just those surfac
46、es that contain lead. The results of the weighted average lead calculation shall be rounded to two decimal places prior to determination of compliance. 4.1 Component surface areas and lead content The following information shall be established to determine the weighted average lead content: 2016 NSF
47、 NSF/ANSI 372 2016 3 a list of all components and materials and their corresponding surface areas that come into direct contact with water; the maximum lead content of each material as specified by reference to a national or international standardized material specification (e.g. UNS copper alloy sp
48、ecification). If the material is not formulated to a national or international standardized specification, the manufacturers material specification shall be used. 4.2 Formula for determining weighted average lead content The following formula shall be used when calculating the weighted average lead
49、content of products: where; WLC = weighted average lead content of product LCc = maximum lead content of the cth component WSAc = wetted surface area of the cth component WSAt = total wetted surface area of all components n = number of wetted components in product NOTE An example calulation of the weighted average lead content of a product is provided in Annex A. 5 Percentage lead content of water contact surfaces The maximum lead content of the material specification used to produce wetted components shall be used to determine compliance w
