ANSI NSF 50A-2016 Equipment for Swimming Pools Spas Hot Tubs and Other Recreational Water Facilities.pdf

1、NSF International Standard / American National StandardNSF/ANSI 50 - 2016aEquipment for Swimming Pools, Spas,Hot Tubs and Other Recreational Water FacilitiesNSF International, an independent, not-for-profit, non-governmental organization, is dedicated to being the leading global provider of public h

2、ealth and safety-based risk management 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, J

3、oint Committee on Recreational Water Facilities c/o NSF International 789 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 50-2016a NSF International Standard/ Americ

4、an National Standard Equipment for Swimming Pools, Spas, Hot Tubs and other Recreational Water Facilities Evaluation criteria for materials, components, products, equipment and systems for use at recreational water facilities Standard Developer NSF International NSF International Designated as an AN

5、SI Standard December 30, 2016 American National Standards Instituteii Recommended for Adoption by The NSF Joint Committee on Recreational Water Facilities The NSF Council of Public Health Consultants Adopted by NSF International May 1977 Revised May 1979 Revised October 2005 Revised September 2012 R

6、evised June 1984 Revised April 2007 Revised December 2013 Revised November 1985 Revised October 2007 Revised June 2014 Revised May 1992 Revised February 2009 Revised July 2015 Revised July 1996 Revised May 2009 Revised August 2016 Revised January 2000 Revised August 2010 Revised June 2017 Revised Ma

7、y 2001 Revised August 2011 Revised March 2004 Addendum November 2011 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 50 2017.” Copyright 2017 NSF

8、International Previous editions 2016, 2015, 2014, 2013, 2011, 2010, 2009, 2008, 2007, 2005, 2004, 2001, 2000, 1996, 1992, 1985, 1984, 1979 Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopyi

9、ng and microfilm, without permission in writing from NSF International. Printed 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. Th

10、e opinions and findings of NSF represent its professional 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 or in connection with the u

11、se, interpretation of, or reliance upon this Standard. NSF Standards provide basic criteria to promote sanitation and protection of the public health. Participation in NSF Standards development activities by regulatory agency representatives (federal, local, state) shall not constitute their agencys

12、 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 performance criteria may reasonably be used in lieu of design, materials, or construction criteria. The illustrations, if pr

13、ovided, are intended to assist in understanding their adjacent standard requirements. 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 impr

14、oper or incomplete design and construction. Unless otherwise referenced, the Annexes are not considered an integral part of NSF Standards. The Annexes provided as general guidelines to the manufacturer, regulatory agency, user, or certifying organization.1 The information contained in this Disclaime

15、r 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 material that has not been subjected to public review or a consensus process. In addition, it does not contain requirements neces

16、-sary for conformance to the Standard. This page is intentionally left blank. v Contents 1 General . 1 1.1 Scope . 1 1.2 Variations in design and operation . 1 1.3 Alternate materials . 1 1.4 Standard review . 1 1.5 Normative references . 1 2 Definitions . 4 3 Swimming pool water contact materials a

17、nd swimming pool treatment chemicals 13 3.1 Swimming pool water contact materials . 13 3.2 Swimming pool treatment chemicals . 14 3.3 Corrosion resistance 15 3.4 Dissimilar metals 15 3.5 Insulating fittings 15 3.6 Piping materials 15 4 Design and construction . 16 4.1 Installation of piping, valves,

18、 and fittings 16 4.2 Assembly 16 4.3 Closing and sealing devices 16 4.4 Suction fittings 16 4.5 PVC Hose 16 4.6 Safety Vacuum Release Systems (SVRS) 16 4.7 Pool and spa covers . 16 4.8 Pool alarms 16 4.9 Barriers and fencing . 16 4.10 Vacuum port fitting cover . 17 5 Filters 17 5.1 General. 17 5.2 P

19、recoat media-type filters 18 5.3 Sand-type filters . 21 5.4 Cartridge-type and high-permeability-type filters . 23 6 Centrifugal pumps. 25 6.1 General. 25 6.2 Hydrostatic pressure test . 25 6.3 Strainers . 26 6.4 Drain plugs . 26 6.5 Shaft seals . 26 6.6 Pump performance curve . 26 6.7 Operation and

20、 installation instructions . 27 6.8 Self-priming pumps 27 6.9 Data plate . 27 6.10 Motors 27 7 Non-integral strainers . 28 7.1 Non-integral strainer basket . 28 7.2 Non-integral strainer cover . 29 7.3 Drain plug . 29 7.4 Head loss 29 7.5 Hydrostatic pressure test . 29 7.6 Operation and installation

21、 instructions . 29 vi 7.7 Data plate . 29 8 Valves . 29 8.1 General. 30 8.2 Positive indexing 30 8.3 Design pressure . 30 8.4 Pressure service 30 8.5 Valve leakage . 30 8.6 Head loss curve . 30 8.7 Waste port seal 31 8.8 Vacuum service 31 8.9 Installation and operating instructions 31 8.10 Identific

22、ation. 31 9 Recessed automatic surface skimmers 31 9.1 Housing 31 9.2 Weir 32 9.3 Strainer basket . 32 9.4 Equalizer line 32 9.5 Cover and mounting ring 33 9.6 Trimmer valves . 34 9.7 Vacuum cleaner connections . 34 9.9 Operation and installation instructions . 34 9.10 Data plate 34 10 Mechanical ch

23、emical feeding equipment . 35 10.1 General 35 10.2 Erosion resistance . 35 10.3 Chemical resistance 35 10.4 Output rate . 36 10.5 Hydrostatic pressure 36 10.6 Life test 36 10.7 Shielding 36 10.8 Motors 36 10.9 Suction lift 36 10.10 Protection against overdosing . 36 10.11 Operation and installation

24、instructions 37 10.12 Data plate 37 11 Flow-through chemical feeding equipment . 37 11.1 General 38 11.2 Chemical resistance 38 11.3 Hydrostatic pressure 38 11.4 Motors 38 11.5 Output rate . 38 11.6 Protection against overdosing . 38 11.7 Flow-indicating device . 38 11.8 Operation and installation i

25、nstructions 39 11.9 Data plate 39 12 Filtration media . 39 12.1 Precoat filter media 39 12.2 Sand and alternate sand-type filter media . 40 13 Ozone generation process equipment . 41 13.1 General 41 vii 13.2 Ozone components . 41 13.3 Ozone generator 41 13.4 Injection methods 41 13.5 Gas flow meter.

26、 42 13.6 Valve and component identification . 42 13.7 Cleanability 42 13.8 Ozone resistant materials 42 13.9 Compatible materials for operation . 42 13.9.2 Components and piping . 42 13.10 Design pressure (pressure vessels) 44 13.11 Head loss . 44 13.12 Water flow meter . 44 13.13 Oxidation-reductio

27、n potential (ORP) monitoring 44 13.14 Warning devices 44 13.15 Operational protection . 45 13.16 Ozone destruct 45 13.17 Ozone output . 45 13.18 Life test 45 13.19 Disinfection efficacy . 45 13.20 Cryptosporidium reduction . 46 13.21 Operation and installation instructions 46 13.22 Information on oz

28、one off-gassing and removal devices 46 13.23 Data plate 47 14 Ultraviolet (UV) light process equipment 47 14.1 General 47 14.2 Cleanability 47 14.3 Design pressure (pressure vessels) 47 14.4 Flow metering device . 47 14.5 Performance indication 48 14.6 Operation and installation instructions 48 14.7

29、 Data plate 48 14.8 Disinfection efficacy . 49 14.9 Valve and component identification . 49 14.10 Operating temperatures . 49 14.11 Operational protection . 49 14.12 Life test 49 14.13 Cleaning . 50 14.14 Ultraviolet (UV) lamps 50 14.15 Chemical resistant materials . 50 14.16 Head loss . 50 14.17 Hy

30、drostatic Pressure Requirements 50 14.18 UV Cryptosporidium inactivation and dose determination 50 15 In-line electrolytic chlorinator or brominator process equipment 51 15.1 General 51 15.2 Cleanability 51 15.3 Design pressure (pressure vessels) 51 15.4 Flow metering device . 51 15.5 Performance in

31、dication 52 15.6 Operation and installation instructions 52 15.7 Data plate 52 15.8 Valve and component identification . 52 15.9 Operating temperatures and pressures . 52 15.10 Operational protection . 53 15.11 Warning devices 53 viii 15.12 Chemical-resistant materials . 53 15.13 Output rate . 53 15

32、.14 Pressure requirements 53 15.15 Life test 53 15.16 Salt level 53 15.17 Head loss . 53 16 Brine (batch) type electrolytic chlorine or bromine generators . 54 16.1 General 54 16.2 Cleanability 54 16.3 Design pressure (pressure vessels) 54 16.4 Flow metering device . 54 16.5 Performance indication 5

33、4 16.6 Operation and installation instructions 54 16.7 Data plate 54 16.8 Valve and component identification . 55 16.9 Operating conditions 55 16.10 Injection methods 55 16.11 Operational protection . 55 16.12 Chemical-resistant materials . 55 16.13 Output rate . 55 16.14 Life test 56 17 Copper/silv

34、er and copper ion generators . 56 17.1 General 56 17.2 Cleanability 56 17.3 Design pressure (pressure vessels) 56 17.4 Flow metering device . 56 17.5 Performance indication 57 17.6 Operation and installation instructions 57 17.7 Data plate 57 17.8 Disinfection efficacy . 58 17.9 Valve and component

35、identification . 58 17.10 Operating temperatures and pressures . 58 17.11 Warning devices 58 17.12 Chemical-resistant materials . 58 17.13 Output rate . 58 17.14 Life test 59 17.15 Uniformity of output . 59 17.16 Head loss . 59 18 Automated controllers . 59 18.1 Scope . 59 18.2 Chemical resistant ma

36、terials . 59 18.3 Monitor display. 59 18.4 Life test 60 18.5 Performance 60 18.6 Failure sensing and signaling devices . 61 18.7 Operational protection . 61 18.8 Operation and installation instructions 61 18.9 Data plate 61 19 Water quality testing devices (WQTD) . 62 19.1 General 62 19.2 Testing .

37、62 19.3 Operation and use instructions 63 ix 19.4 WQTD marking / identification . 63 20 Spas and hot tubs . 64 20.1 General 64 20.2 Materials 64 20.3 Electrical components . 64 20.4 Design and construction 64 20.5 Circulation system . 67 20.6 Air blower and air induction systems . 70 20.7 Temperatur

38、e control systems, heaters, and controls 71 20.8 Sanitation and treatment systems . 71 20.9 Data plate 72 20.10 Owners manual . 73 21 Fittings for water-park, spray-pad, pool, or spa 75 21.1 Water inlet or water return fittings . 75 21.2 Surface or deck drain fittings . 76 21.3 Overflow fittings and

39、 perimeter grating 77 21.4 Fittings for water circulation and treatment . 78 22 Heat exchangers, heaters, coolers, and solar water heating systems . 79 22.1 General 79 22.2 Performance 79 22.3 Operation and installation instructions 80 22.4 Marking and product identification . 80 23 Flow metering de

40、vice 81 23.1 Scope . 81 23.2 Performance testing 81 23.3 Evaluation and testing criteria . 81 23.4 Design, construction and performance requirements . 81 23.5 Fastener evaluation . 81 23.6 Working pressure and pressure testing . 82 23.7 Head loss . 82 23.8 Flow rate measurement accuracy . 82 23.9 Fl

41、ow metering device testing and accuracy levels 83 23.10 Display flow rate scale range . 83 23.11 Display resolution 83 23.12 Life testing . 84 23.13 Product marking or data plate . 84 23.14 Installation and operation manual 84 Annex A Materials review and qualification methods . 87 Annex B Test meth

42、ods for the evaluation of filters . 91 Annex C 103 Test methods for the evaluation of centrifugal pumps . 103 Annex D Test methods for the evaluation of valves and manufactured manifolds . 109 Annex E Test methods for the evaluation of recessed automatic skimmers 125 Annex F Test methods for the eva

43、luation of mechanical chemical feeders . 131 Annex G Test methods for the evaluation of flow-through chemical feeding equipment . 139 x Annex H Test methods for the evaluation of process equipment . 145 Annex I Life test 163 Annex J Equipment recommendations for installation and operation 165 Annex

44、K Recessed automatic surface skimmers recommendations for installation and operation . 173 Annex L Diatomite-type filters recommendations for installation and operation . 175 Annex M Sand-type filters recommendations for installation and operation . 177 Annex N Test methods for the evaluation of aut

45、omated chemical controllers 179 Annex O Water quality testing devices . 185 Annex P Variable-speed pumps recommendation for installation and operation . 201 Annex Q Recommended water quality maintenance for spas 205 Annex R Toxicology review and evaluation procedures for swimming pool treatment chem

46、icals . 213 Annex S Flow metering devices outdoor use 241 Annex T Flow metering devices head loss . 243 Interpretation Annex 245 xi Foreword2 The purpose of this Standard is to establish minimum materials, design and construction, and performance requirements for components, products, equipment and

47、systems, related to public and residential recreational water facility operation. If a value for measurement is followed by a value in other units in parenthesis, the second value may be only approximate. The first stated value is the requirement. In this edition of NSF/ANSI 50 editorial revisions a

48、nd the following issues were incorporated: Issue 108 Changes were made to the skimmer performance test procedure. Issue 110 This issue changed the turbidity tolerance from 45 +/- 10 NTU to 45 +/- 5 NTU. Issue 118 The upper limit of challenge organisms in H.1.6.2 was removed. Issue 119 Language was a

49、dded to specify that the Hydrostatic pressure test in 11.3 be performed on the same sample as the test in 11.2. Issue 120 Requirements for pump voltage in 6.6 and C.1 were updated. Issue 121 A discrepancy in units in B.4.3.1 was corrected. Issue 122 Section N.2.3.3.1 was updated to require 4 ORP sensors, consistent with other language in Annex N. Issue 123 Column titles in Tables O.1 through O.9 were updated for consistency. Issue 125 This revision modified the test procedure for automated controllers. 2The information contained in this Foreword is not part of this American Nation