NSF 29-2012 Detergent and Chemical Feeders for Commercial Spray-Type Dishwashing Machines.pdf

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1、NSF International Standard / American National StandardNSF/ANSI 29 - 2012 Detergent and Chemical Feedersfor Commercial Spray-Type Dishwashing MachinesNSF International, an independent, not-for-profit, non-governmental organization, is dedicated to being the leading global provider of public health a

2、nd 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, Joint Co

3、mmittee on Food Equipment 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.org i NSF/ANSI 29 2012 NSF International Standard/ American National Stan

4、dard for Food Equipment Detergent and chemical feeders for commercial spray-type dishwashing machines Standard Developer NSF International NSF International Board of Directors Approved as an ANSI Standard August 8, 2012 American National Standards Instituteii Prepared by The NSF Joint Committee on F

5、ood Equipment Recommended for Adoption by The NSF Council of Public Health Consultants Adopted by The NSF Board of Trustees September 1969 Revised February 1975 Revised June 1982 Revised November 1992 Revised April 2003 Revised April 2007 Revised April 2009 Revised August 2012 Published by NSF Inter

6、national 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 29 2012.” Copyright 2012 NSF International Previous editions 2009, 2007, 2003, 1992, 1982, 1975, 1969 Unless otherwise spec

7、ified, 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. Printed in the United States of America. iii Disclaimers1NSF, in performing its function

8、s 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 shall not be responsible to anyone for the use of or reliance upon this Standard by anyo

9、ne. 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 provide basic criteria to promote sanitation and protection of the public health. Provision

10、s 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 Standards development activities by regulatory agency representatives (federal, local, stat

11、e) 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 performance criteria may reasonably be used in lieu of design, materials, or constructi

12、on 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, nor do they show the only method of fabricating such arrangements. Such partial drawi

13、ngs 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 guidelines to the manufacturer, regulatory agency, user, or certifying organization. 1Th

14、e 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 material that has not been subjected to public review or a consensus process. In additio

15、n, it does not contain requirements necessary for conformance to the Standard. iv This page is intentionally left blank.v Contents 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 . 2 5 Design and c

16、onstruction . 2 5.1 General . 2 5.2 Service . 2 5.3 Water and waste connections 2 5.4 Provision for mounting 2 5.5 Openings 3 5.6 Louvers . 3 5.7 Delivery verification 3 5.8 Chemical sanitizing feeders . 3 6 Performance . 4 6.1 Hydrostatic test . 4 6.2 Differential of feeders . 4 6.3 Reliability tes

17、t . 4 7 Installation, operation, and maintenance instructions . 5 7.1 Manual 5 7.2 Operating instructions 5 Annex A . A1 A.1 General . A1 A.2 Service connections . A1 A.3 Location of sensing element . A1 A.4 Accessibility A1 A.5 Reservoir capacity A1 A.6 Flow pressure final rinse line . A1 A.7 Feede

18、r location . A2 vi This page is intentionally left blank. vii Foreword2The purpose of this Standard is to establish minimum public health and sanitation requirements for chemical sanitizing feeders, detergent feeders, rinse agent feeders, and similar devices. Issue 4 This revision updated the Normat

19、ive References and boilerplate language in: 1.4 Measurement. This Standard was developed by the NSF Joint Committee on Food Equipment using the consensus process described by ANSI. Suggestions for improvement of this Standard are welcome. Comments should be sent to Chair, Joint Committee on Food Equ

20、ipment at standardsnsf.org, or c/o NSF International, Standards Department, P.O. Box 130140, Ann Arbor, Michigan 48113-0140, USA. 2The information contained in this Foreword is not part of this American National Standard (ANS) and has not been processed in accordance with ANSIs requirements for an A

21、NS. 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. This page is intentionally left blank.1 2012 NSF NSF/ANSI 29 2012 NSF/ANSI Standard for Food

22、 Equipment Detergent and chemical feeders for commercial spray-type dishwashing machines 1 General 1.1 Purpose This Standard establishes minimum public health and sanitation requirements for chemical sanitizing feeders, detergent feeders, rinse agent feeders, and similar devices for commercial spray

23、-type dishwashing machines. 1.2 Scope This Standard covers chemical sanitizing feeders, detergent feeders, drying agent feeders, and similar devices that automatically maintain the concentration of additives in the prewash, wash, pumped rinse, or final rinse of commercial spray-type dishwashing mach

24、ines. Equipment components and materials covered under other NSF or NSF/ANSI Standards or Criteria shall also conform to the requirements therein. 1.3 Alternate materials, design, and construction While specific materials, design, and construction may be stipulated in this Standard, equipment that i

25、ncorporates alternate materials, design, or construction may be acceptable when such equipment meets intent of the applicable requirements herein. This Standard is not intended to restrict new unit design, provided that such design meets the minimum specifications described herein. 1.4 Measurement D

26、ecimal and SI conversions provided parenthetically shall be considered equivalent. Metric conversions and significant figure rounding have been made according to IEEE/ASTM SI 10. 2 Normative references The following documents contain provisions that, through reference, constitute provisions of this

27、NSF/ANSI Standard. 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

28、 document shall be used for undated references. IEEE/ASTM SI 10 2010. American National Standard for Metric Practice33ASTM International, 100 Barr Harbor Dr., West Conshohocken, PA 19428 . 2012 NSF NSF/ANSI 29 2012 2 NSF/ANSI 51. Food equipment materials. NSF/ANSI 170. Glossary of food equipment ter

29、minology 3 Definitions Terms used in this Standard that have special technical meaning are defined in NSF/ANSI 170. 4 Materials The requirements contained in this section are intended to protect food from contamination and ensure that the materials used in the manufacture of food service equipment r

30、esist wear; penetration by vermin; and the effects of foods, heat, cleaning compounds, sanitizers, and other substances that may contact the materials in the intended use environment. Materials shall conform to the requirements in NSF/ANSI 51 applicable to the zone in which the material is used. 5 D

31、esign and construction This section contains design and construction requirements for equipment covered within the scope of this Standard. 5.1 General Feeders shall automatically dispense additives to maintain the recommended concentration in the prewash, wash, pumped rinse, or final rinse. When ins

32、talled according to the manufacturers instructions, the feeder shall prevent uncontrolled siphonage or discharge of chemicals into the prewash, wash, pumped rinse, or final rinse. 5.2 Service Feeders shall be fabricated to be easily cleaned, maintained, and serviced, and to facilitate chemical reple

33、nishment in accordance with the manufacturers instructions. 5.3 Water and waste connections The feeder shall be designed to be capable of being installed to comply with applicable codes. 5.4 Provision for mounting Feeders to be attached to the dishwashing machine cabinet shall conform to one of the

34、following requirements: 5.4.1 Designed to prevent accumulation of moisture, seepage, and soil in the area around and between the feeder and mounting surface. 5.4.2 Designed to provide a clear, unobstructed space between the feeder and mounting surface to permit easy cleaning. 2012 NSF NSF/ANSI 29 20

35、12 3 5.4.3 Designed to ensure that the area around and between the feeder and mounting surface is easily cleanable. 5.5 Openings 5.5.1 Openings shall be located in a position protected from splash, spillage, or overhead drippage. 5.5.2 Screening on openings, if provided, shall be 16 mesh (minimum 16

36、 strands per 1.0 in 25 mm) or equivalent and set in a removable sash for easy cleaning. 5.6 Louvers 5.6.1 Louvers that may be subject to overhead splashes, spills, and drips shall be of a drip deflecting design, or they shall be readily removable and the space immediately behind the louver easily cl

37、eanable. 5.6.2 If electrical safety requirements prohibit the use of readily removable louvers, then such louvers need only be removable. 5.6.3 Louvers shall be free of sharp edges and burrs and shall have spaces large enough to allow for easy cleaning. 5.7 Delivery verification 5.7.1 Rinse aid feed

38、ers shall be manufactured or equipped to provide an effective indication (visual or audible, or both) when additive supply is depleted, or when additive is not being delivered to the final rinse. NOTE Some examples of systems that meet the intent of this requirement are a clear sight-tube, or a tran

39、slucent supply reservoir that shows the operator that the chemicals are depleted or no longer being dispensed. 5.7.2 Detergent and chemical sanitizer feeders shall include: a visual means to verify that detergents and sanitizers are delivered; or a visual or audible alarm to signal if detergents and

40、 sanitizers are not available for delivery to the respective washing and sanitizing systems. NOTE Some examples of systems that meet the intent of this requirement are a flow indicator, flashing light, buzzer, or visible open-air delivery system that shows the operator that the chemicals are no long

41、er being dispensed. 5.8 Chemical sanitizing feeders 5.8.1 Chemical resistance Normally wetted surfaces shall be resistant to the concentration of sodium hypochlorite or other chemical solution to be used. 5.8.2 Delivery data A manufacturer shall provide data to permit the proper matching of feeder t

42、o dishwashing machine. Data shall include, but not be limited to: the feed rate (mL/second); the type and strength of solution; and the pressure against which the feeder will work (e.g., atmospheric, line water pressure). 2012 NSF NSF/ANSI 29 2012 4 5.8.3 Data plate If the chemical feeder is not an

43、integral part of the dishwashing machine, each chemical feeder shall have a data plate that, at a minimum, includes the following information: name of manufacturer or trade name; model number; type of signal; duration of signal, if applicable; electrical characteristics; feed rate (mL/second). If th

44、e feeder has a variable feed rate, the manufacturer shall provide supply delivery data; feed time (seconds). If the feeder has a variable feed time, the manufacturer shall provide supply delivery data; line pressure, if applicable; and type and maximum concentration of solution to be delivered. 6 Pe

45、rformance 6.1 Hydrostatic test Feeders with water connections shall withstand a pressure equal to two times the reliability test pressure without external leakage. 6.2 Differential of feeders Detergent feeders that utilize a concentration sensing or equivalent mechanism shall maintain the solution c

46、oncentration within 10% of the established setting in normal operating range when tested at 150 1 F (65.6 0.5 C). 6.3 Reliability test Rinse aid feeders shall operate for 300 continuous minutes at the maximum output rate. The feeders shall then be cycled off and on 60 times with each cycle consistin

47、g of a period of 60 10 s “off,” followed by 100 10 s “on.” The entire test shall be conducted at an ambient temperature of 100 1 F (37.8 0.5 C). If connected to a water line, water shall be supplied as described in 6.3.1 or 6.3.2. 6.3.1 For feeders connected to the rinse line downstream from the vac

48、uum breaker, the water pressure shall be 25 1 psi (172 7 kPa) and the water temperature shall be 195 3 F (90.6 1.5 C). 6.3.2 For feeders powered by water other than rinse line water, the water pressure shall be 75 1 psi (516 7 kPa), and the water temperature shall be 160 3 F (71.1 1.5 C). 2012 NSF N

49、SF/ANSI 29 2012 5 6.4 Performance tests for chemical sanitizing feeders 6.4.1 Chemical resistance test Normally wetted parts shall be exposed to the recommended maximum-use concentration of the chemical solution for 90 days at 73.4 3.6 F (23 1.8 C). The feeder shall then be operated for 24 h under maximum-use conditions and shall conform to the requirements of 6.4.2. 6.4.2 Uniformity of output When operated according to the manufacturers instructions, the chemical sanitizing f