1、 NSF/ANSI 44 2004 Residential cation exchange water softeners NSF International Standard/ American National Standard NSF/ANSI 44 2004Copyright NSF International (National Sanitation Foundation) Provided by IHS under license with NSFNot for ResaleNo reproduction or networking permitted without licens
2、e from IHS-,-,-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 management solutions while serving the interests of all stakeholders. This Standard is subject to revision. Contac
3、t NSF to confirm this revision is current. Users of this Standard may request clarifications and inter-pretations, or propose revisions by contacting: Chair, Joint Committee on Drinking Water Treatment Units c/o NSF International 789 North Dixboro Road, P.O. Box 130140 Ann Arbor, Michigan 48113-0140
4、 USA Phone: (734) 769-8010 Telex: 753215 NSF INTL FAX: (734) 769-0109 E-mail: infonsf.org Web: http:/www.nsf.org Copyright NSF International (National Sanitation Foundation) Provided by IHS under license with NSFNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NSF/A
5、NSI 44 2004 i NSF International Standard/ American National Standard for Drinking Water Treatment Units Residential cation exchange water softeners Standard Developer NSF International June 15, 2004 NSF International Designated as an ANSI standard June 15, 2004 American National Standards Institute
6、Copyright NSF International (National Sanitation Foundation) Provided by IHS under license with NSFNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ii Prepared by The NSF Joint Committee on Drinking Water Treatment Units Recommended for adoption by The NSF Council o
7、f Public Health Consultants Adopted by The NSF Board of Directors December 1987 Revised November 1996 Revised November 1998 Revised September 1999 Revised May 2000 Revised November 2000 Revised January 2001 Revised February 2002 Editorial revision December 2003 Revised June 2004 Published by NSF Int
8、ernational PO 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 44 2004.” Copyright 2004, NSF International Previous editions 2002, 2001, 2000, 1999, 1998, 1996, 1987 Unless otherwise s
9、pecified, no part of this publication may be reproduced or utilized in any form or by any means, elec-tronic or mechanical, including photocopying and microfilm, without permission in writing from NSF International. Printed in the United States of America. Copyright NSF International (National Sanit
10、ation Foundation) Provided by IHS under license with NSFNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-iii Disclaimers1NSF, in performing its functions in accordance with its objectives, does not assume or undertake to discharge any responsibility of the manufactu
11、rer or any other party. The opinions and findings of NSF represent its pro-fessional judgment. NSF shall 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
12、or in connection with the use, interpretation of, or reliance upon this Standard. NSF Standards provide 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 o
13、ther national standards-setting organizations provide safety requirements. Participation in NSF Standards 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
14、of performance criteria measurable by examination or testing in NSF Standards development when such performance criteria may reasonably be used in lieu of design, materials, or con-struction criteria. The illustrations, if provided, are intended to assist in understanding their adjacent standard req
15、uirements. However, the illustrations may not include all requirements for a specific product or unit, 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, th
16、e annexes are not considered an integral part of NSF Standards. The an-nexes are provided as general guidelines to the manufacturer, regulatory agency, user, or certifying organiza-tion. 1The information contained in this Disclaimer is not part of this American National Standard (ANS) and has not be
17、en processed in accordance with ANSIs requirements for an ANS. As such, this Disclaimer may contain material that has not been subjected to public review or a consensus process. In addition, it does not contain requirements necessary for con-formance to the Standard. Copyright NSF International (Nat
18、ional Sanitation Foundation) Provided by IHS under license with NSFNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-iv This page is intentionally blank. Copyright NSF International (National Sanitation Foundation) Provided by IHS under license with NSFNot for Resale
19、No reproduction or networking permitted without license from IHS-,-,-v Contents Foreword vii 1 General 1 1.1 Purpose . 1 1.2 Scope 1 1.3 Alternate materials, design, and construction . 1 2 Normative references 1 3 Definitions 2 4 Materials 6 4.1 General 6 4.2 Materials evaluation. 6 Table 1 Extracti
20、on testing parameters . 8 Table 2 Formulation dependent extraction testing parameters . 10 Table 3 Materials listed in U.S. Code of Federal Regulations, 12 Table 4 Non-specific extraction testing parameters 12 5 Structural performance 13 5.1 Structural integrity 13 Table 5 Structural integrity perfo
21、rmance testing16 6 Minimum performance requirements 18 6.1 Hazards . 18 6.2 Electrical safety and operation 18 6.3 Waste connections 18 6.4 Brine tank 18 6.5 Operation. 18 6.6 Performance indication 19 Table 6 Temperature correction factors for pressure drop 31 7 Mandatory testing for elective claim
22、s 32 7.1 Scope 32 7.2 Barium and radium reduction 35 8 Instruction and information 40 8.1 Installation, operation, and maintenance instructions . 40 8.2 Data plate 42 8.3 Performance data sheet 42 Copyright NSF International (National Sanitation Foundation) Provided by IHS under license with NSFNot
23、for ResaleNo reproduction or networking permitted without license from IHS-,-,-vi Annex A Key elements of a certification program for drinking water treatment systems and components.A1 A.1 Marking the product A1 A.2 Listing certified companiesA1 A.3 Annual audits.A1 A.4 Testing.A1 A.5 Toxicological
24、evaluation of materials formulationsA2 A.6 Corrective action .A2 A.7 EnforcementA2 A.8 Administrative review A2 A.9 Appeals .A2 A.10 Complaints A2 A.11 Advertising.A3 A.12 Records .A3 A.13 Public noticeA3 A.14 ConfidentialityA3 Copyright NSF International (National Sanitation Foundation) Provided by
25、 IHS under license with NSFNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-vii Foreword2The purpose of this Standard is to establish minimum requirements for materials, design, construction, and performance of drinking water treatment units that are designed to red
26、uce specific aesthetic-related contami-nants in public or private water supplies. This Standard specifies the minimum product literature and labeling information that a manufacturer must supply to authorized representatives and system owners. Lastly, the Standard provides minimum service-related obl
27、igations that the manufacturer must extend to system owners. Water contact materials in Drinking Water Treatment Units listed under NSF/ANSI 42, 44, 53, 55, 58, and 62 are tested and evaluated under a separate protocol from NSF/ANSI 61 with criteria that were developed spe-cifically for the intended
28、 end-use. NSF/ANSI 61 listing should not be additionally required for acceptance of these listed units for water contact application. This edition of the Standard contains the following revisions: The term “permanent” when used with pressure vessels has been removed. These changes are re-flected in
29、the definitions section with the removal of permanent pressure vessel and with the deletion of “permanent” from table 5. Elimination of the definition does not change the intent or pass/fail criteria of the Standard. Section 4.2.3.5 has been revised to clarify how without media testing is to be cond
30、ucted in complex scenarios involving media that is chemically bound to non-media materials. The terms disposable system and disposable components have been added to definitions since these classifications are now used in Table 5. The term intermittent flow rate has been added because plumbing codes
31、specify pressure loss characteristics to be determined at the code specified water supply fixture unit (WFSU) flows. WSFU flows are sporadic bursts of short duration flow rate spikes that do not affect water softener capacity and efficiency performances. A modification was made to the definition of
32、maximum service flow rate. Section 5.1.1 has been revised to clarify that burst testing is not required for complete systems, only nonmetallic components. A second brine accuracy test method for systems with a time controlled brine delivery system has been added to 6.7.3.4. Provisions for reporting
33、intermittent flow rates at a 30 psig pressure drop has been added to 6.7.4.5. Other revisions included in this edition of the Standard are: normative references updates, addition of a maximum cycle length for the cyclic pressure test, further clarifications to the structural integrity section, and f
34、urther revisions to table 5 to clarify the differences in structural integrity testing requirements between sys-tems and components For informational purpose, the reformat table has been included in NSF/ANSI 44 2004 edition. NSF/ANSI 44 2002 was reformatted to make the Standard more user friendly. S
35、ome of the section head-ings have been modified to more accurately reflect the contents of the sections. Structural integrity is a stand-alone section. For all substance claims being made the claim, method, and sampling will be found under the substance heading. Tables and apparatus were moved to th
36、e appropriate sections for ease of use. 2The information contained in this Foreword is not part of this American National Standard (ANS) and has not been proc-essed in accordance with ANSIs requirements for an ANS. As such, this Foreword may contain material that has not been subjected to public rev
37、iew or a consensus process. In addition, it does not contain requirements necessary for con-formance to the Standard. Copyright NSF International (National Sanitation Foundation) Provided by IHS under license with NSFNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
38、viii NSF/ANSI 44 2002 NSF/ANSI 44 2002e New page numbers Tables 1- 4 Table 1 4 8 12 5 Design and Construction 6 Minimum performance requirements 18 32 5.1 Working pressure 5.1.2 Working pressure 13 5.2 Hazards 6.1 Hazards 18 5.3 Electrical safety operation 6.2 Electrical safety operation 18 5.4 Wast
39、e connections 6.3 Waste connections 18 5.5 Brine tank 6.4 Brine tank 18 5.6 Operation 6.5 Operation 18 5.7 Performance indication 6.6 Performance indication 19 6 Chemical, mechanical, and structural performance 7 Mandatory testing for elective claims 32 40 6.1 Scope 7.1 Scope 32 6.2 General test con
40、ditions and methods 6.7.1.4 General test conditions and methods 6.7.2.4 General test conditions and methods 20 22 Figure 1 Figure 2 20 6.3 Capacity test 6.7.2 Salt efficiency and water consumption during regeneration 7.1.1 Salt efficiency and water consumption during regeneration 21 25 32 34 Figure
41、4 Figure 3 24 6.4 Accuracy of the brine system 7.3 Accuracy of the brine system claims 36 40 6.5 Structural integrity 5 Structural performance 13 18 Figure 3 Figure 1 14 Table 5 Table 5 16 6.6 Pressure drop 6.7.4 Pressure drop 27 31 Figure 2 Figure 4 29 Table 6 Table 6 31 6.7 Barium and radium reduc
42、tion 7.2 Barium and radium reduction 35 6.9 Structural integrity test methods 5.1.3 Structural integrity test methods 13 18 6.8 Conformance by calculation 7.3 Conformance by calculation 36 40 Figure 5 Figure 5 38 Figure 6 Figure 6 39 7 Instruction and have a salt capacity sufficient for a minimum of
43、 five regenerations at the maximum salt dosage of the softener. 6.5 Operation 6.5.1 Autoinitiated water softener Autoinitiated water softeners shall have a means to initiate a regeneration process manually. 6.5.2 Water supply Systems shall provide a means to maintain the supply of water to service d
44、uring the regeneration process. Copyright NSF International (National Sanitation Foundation) Provided by IHS under license with NSFNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- 2004 NSF NSF/ANSI 44 2004 19 6.6 Performance indication Systems making claims for the
45、 reduction of health related contaminants shall be provided with an effective means to warn the user when it is not performing their function(s). This shall be accomplished by one of the following: sounding an alarm or flashing a light, each connected to an acceptable power source; providing a sampl
46、ing kit for analysis of hardness or other appropriate contaminants; or providing a hardness monitor. 6.7 Chemical and mechanical performance 6.7.1 Softening performance Water softeners shall deliver water that contains less than 1 gpg (1 gpg = 17.1 mg/L) hardness at the manu-facturers maximum servic
47、e flow rate when the influent water contains 20 2 gpg (342 34.2 mg/L) hardness (as calcium carbonate) and not more than 5 gpg (5 gpg = 85 mg/L) of sodium when tested in accordance with 6.7.1. Water softeners shall deliver soft water for a period of not less than 10 min when tested in accordance with
48、 6.7.1. 6.7.1.1 Application This test shall be used for determining the following requirements and performance ratings for softening per-formance. 6.7.1.2 Apparatus A test apparatus capable of providing specified flow rates and static pressures shall be used. An example ap-paratus shown schematically in figure 2 enables all tests to be performed except the hydrostatic tests for evaluating structural integrity. Apparatus required to supply the challenge water is not shown but may consist of a mixing tank, chemical feed pump(s), supply pump, pressure tank, relief valve, water supply valve, etc.
