1、NSF International Standard / American National StandardNSF/ANSI 358-3 - 2016Cross-linked polyethylene (PEX) pipeand fittings for water-based ground-source (geothermal) heat pump systems NSF International, an independent, not-for-profit, non-governmental organization, is dedicated to being the leadin
2、g global provider of public health 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 revi
3、sions by contacting: Chair, Joint Committee on Plastics 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 International Standard/ American
4、National Standard for Plastics Cross-linked polyethylene (PEX) pipe and fittings for water-based ground-source (geothermal) heat pump systems Standard Developer NSF International NSF International Designated as an ANSI Standard June 15, 2016 American National Standards Institute NSF/ANSI 358-3 2016
5、ii Prepared by The NSF Joint Committee on Plastics Recommended for Adoption by The NSF Council of Public Health Consultants Adopted by NSF International June 2016 Published by NSF International PO Box 130140, Ann Arbor, Michigan 48113-0140, USA For ordering copies or for making inquiries with regard
6、 to this Standard, please reference the designation “NSF/ANSI 358-3 2016.” Copyright 2016 NSF International 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 permi
7、ssion 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. The opinions and findings of NSF
8、 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 use, interpretation of, or reli
9、ance 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 other national standards-setting organizations provide saf
10、ety 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 of performance criteria measurable by examination or test
11、ing in NSF Standards development when such 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
12、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, the annexes are not considered an integral part of NSF Stand
13、ards. The annexes are provided as general guidelines 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 A
14、NS. 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 necessary for conformance to the Standard. This page is intentionally left blank.v Contents 1 General . 1 1.1 Purpose 1 1.2 Scope 1 2
15、 Normative References 1 3 Definitions . 2 4 Material Requirements . 3 4.1 Plastic Materials . 3 4.2 Long-term strength of plastic pipe 4 4.3 Hydrostatic design 4 5 General Requirements . 4 5.1 Cross-linked polyethylene pipe 4 5.2 Fittings for cross-linked polyethylene pipe . 4 5.3 Chemical Resistanc
16、e . 4 5.4 Mechanical joints 5 5.5 Constant tensile load joint test . 5 5.6 Joining 5 6 Marking Requirements . 5 6.1 Pipe Marking 5 6.2 Fitting Marking 6 6.3 Manufacturers Instructions 6 6 This page is intentionally left blank. 7 Foreword2 Geothermal technology has been used in North America for deca
17、des and is experiencing tremendous interest. In 2009, the NSF Joint Committee on Plastics and RV Plumbing Components proposed to develop this Standard after a need was identified in the industry. Plastic piping system components are used in the construction of earth energy systems yet there is no No
18、rth American standard addressing all relevant aspects of earth energy systems. It is the intent of this Standard to assist in a more consistent approval and mainstream code adoption of the geothermal piping systems technology. This standard will be separated into four separate documents based on mat
19、erial types. NSF/ANSI 358-3 addresses products in cross-linked polyethylene (PEX) pipe and fittings for water-based, ground-source (geothermal) heat pump systems This Standard was developed by the NSF Joint Committee on Plastics using the consensus process described by the American National Standard
20、s Institute. Suggestions for improvement of this Standard are welcome. This Standard is maintained on a Continuous Maintenance scheduled and can be opened for comment at any time. Comments should be sent to Chair, Joint Committee on Plastics at standardsnsf.org or, c/o NSF International, Standards D
21、epartment, P.O. Box 130140, Ann Arbor, Michigan, 48113-0140, USA. 2 The 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 ANS. Therefore, this Foreword may contain material that has not
22、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 2016 NSF NSF/ANSI 358-3 2016 NSF International Standard for Plastics Cross-linked Polyethylene (PEX) Pipe and Fitti
23、ngs for Water-based Ground-source (Geothermal) Heat Pump Systems 1 General 1.1 Purpose This Standard establishes the minimum physical and performance requirements for plastic piping system components. These criteria were established for the protection of property, public health and the environment.
24、1.2 Scope The physical and performance requirements in this standard apply to plastic piping system components as well as non-plastic components of the ground loop heat exchanger including but not limited to cross-linked polyethylene (PEX) pipes and fittings used in water-based ground-source heat pu
25、mp systems. This standard does not cover refrigerant based ground loop heat exchangers such as direct expansion (DX) systems. This Standard does not cover hydronic heating or cooling systems within buildings. 2 Normative References The following documents contain provisions that, through reference,
26、constitute provisions of this NSF 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. For undated ref
27、erences, the most recent version shall be referenced. These are Normative References for Cross-linked Polyethylene (PEX) Pipe and Fittings for Water-based Ground-source (Geothermal) Heat Pump Systems. ASTM D543. Standard Practices for Evaluating the Resistance of Plastics to Chemical Reagents 3 ASTM
28、 D2290. Standard Test Method for Apparent Hoop Tensile Strength of Plastic or Reinforced Plastic Pipe3 ASTM D2837. Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastics Pipe Products3 ASTM F412. Terminology Relating t
29、o Plastic Piping Systems3 ASTM F876. Standard Specification for Cross-linked Polyethylene (PEX) Tubing3 3 American Society for Testing Materials (ASTM), 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959 . 2016 NSF NSF/ANSI 358-3 - 2016 ASTM F877. Standard Specification for Cross-linked Polyeth
30、ylene (PEX) Plastic Hot- and Cold-water Distribution Systems3 ASTM F1055. Standard Specification for Electrofusion Type Fittings for Outside Diameter Controlled Polyethylene and Cross-linked Polyethylene (PEX) Pipe and Tubing3 ASTM F1588. Standard Test Method for Constant Tensile Load Joint Test (CT
31、LJT)3 ASTM F1807. Standard Specification for Metal Insert Fittings Utilizing a Copper Crimp Ring for SDR9 Cross-linked Polyethylene (PEX) Tubing3 ASTM F1960. Standard Specifications for Cold Expansion Fittings with PEX Reinforcing Rings for Use with Cross-linked Polyethylene (PEX) Tubing3 ASTM F1961
32、. Standard Specification for Metal Mechanical Cold Flare Compression Fittings with Disc Spring for Cross-linked Polyethylene (PEX) Tubing3 ASTM F2080. Standard Specification for Cold-Expansion Fittings with Metal Compression Sleeves for Cross-linked Polyethylene (PEX) Tubing3 ASTM F2159. Standard Sp
33、ecification for Plastic Insert Fittings Utilizing a Copper Crimp Ring for SDR9 Cross-linked Polyethylene (PEX) Tubing3 ASTM F2434. Standard Specification for Metal Insert Fittings Utilizing a Copper Crimp Ring for SDR9 Cross-linked Polyethylene (PEX) Tubing and SDR9 Cross-linked Polyethylene/Aluminu
34、m/Cross-linked Polyethylene (PEX-AL-PEX) Tubing3 CAN/CSA B137.5. Cross-linked Polyethylene (PEX) Tubing Systems for Pressure Applications4 PPI TR-3. Policies and Procedures for Developing Hydrostatic Design Basis (HDB), Hydrostatic Design Stresses (HDS), Pressure Design Basis (PDB), Strength Design
35、Basis (SDB), and Minimum Required Strength (MRS) Ratings for Thermoplastic Piping Materials or Pipe5 PPI TR-4. Listing of Hydrostatic Design Basis (HDB), Hydrostatic Design Stress (HDS), Strength Design Basis (SDB), Pressure Design Basis (PDB), and Minimum Required Strength (MRS) Ratings for Thermop
36、lastic Piping Materials or Pipe5 3 Definitions Terms used in this Standard that have a specific technical meaning are defined here. 3.1 compound: A mixture of polymers with other ingredients such as fillers, stabilizers, catalysts, processing aids, lubricants, modifiers, pigments, or curing agents.
37、NOTE Compounds are considered materials; however, not all materials are considered compounds. 3.2 contamination: The presence of a substance not intentionally incorporated in a product. 3.3 critical dimensions: Dimensions of a product (e.g., pipes and fittings) that directly affect the fit and funct
38、ion, or the capacity of making a sound joint, or both. 4 Canadian Standards Association (CSA), 5060 Spectrum Way, Suite 100, Mississauga, Ontario, Canada L4 5N6 5 Plastics Pipe Institute (PPI), 105 Decker Court, Suite 825, Irving, TX 75062 2016 NSF NSF/ANSI 358-3 - 2016 3.4 fitting: A piping compone
39、nt used to join, terminate, or provide changes of direction in a piping system. 3.5 ground-source heat pump system: A terminology used to describe a variety of mechanical systems that use the ground, groundwater, or surface water as a heat source or heat sink. Systems can be further described as gro
40、und-coupled, groundwater and surface water heat pump systems. 3.6 hydrostatic design basis (HDB): One of a series of established stress values specified in ASTM D28373 for a plastic compound, obtained by categorizing the long-term hydrostatic strength determined in accordance with ASTM D2837. 3.7 hy
41、drostatic design stress (HDS): The estimated maximum tensile stress a material is capable of withstanding continuously with a high degree of certainty that failure of the pipe will not occur. This stress is circumferential when internal hydrostatic water pressure is applied. 3.8 joint: The location
42、at which two pieces of pipe or a pipe and a fitting are connected together. Various joint types not defined in this Standard shall be defined by ASTM F412.3 3.9 mechanical joint: A connection between two pieces of pipe or a pipe and a fitting using a physical device to establish a seal or alignment.
43、 3.10 plastic pipe: A hollow cylinder of plastic, in which the wall thicknesses are usually small when compared to the diameter, and in which the inside and outside walls are essentially concentric. 3.11 plastic: A material that contains as an essential ingredient one or more organic polymeric subst
44、ances of large molecular weight, is solid in its finished state, and, at some stage in its manufacture or processing into finished articles, can be shaped by flow. 3.12 pressure rating: The estimated maximum water pressure at a specified temperature that a pipe is capable of withstanding continuousl
45、y with a high degree of certainty that failure of the pipe will not occur. 3.13 quality assurance: A formal system for verifying that products conform to specific standards. Quality assurance is intended as an audit of quality control testing. 3.14 quality control: The methods used to ensure that a
46、production process yields products in conformance with the appropriate specifications established by the quality assurance program. 3.15 steady-state: An operational condition of the manufacturing process that does not change with time. 3.16 thermoplastic: noun A plastic that can be repeatedly softe
47、ned by heating and hardened by cooling through a temperature range characteristic of plastic, and in the softened state, can be shaped by flow through molding or extrusion. adjective Capable of being repeatedly softened by heating and hardened by cooling through a temperature range characteristic of
48、 the plastic, and able in the softened state to be shaped by flow into articles by molding or extrusion. 4 Material Requirements 4.1 Plastic Materials Materials for cross-linked polyethylene pipe shall be produced from high density polyethylene meeting the material requirements of ASTM F8763. 2016 N
49、SF NSF/ANSI 358-3 - 2016 4.2 Long-term strength of plastic pipe Materials for use in plastic pipe shall comply with long-term strength compliance in 4.3. Listing in PPI Technical Report Number 4 (TR-4) is acceptable evidence of hydrostatic design stress compliance. 4.3 Hydrostatic design The minimum hydrostatic design basis of polyethylene material shall be determined in accordance with ASTM D2837 and PPI Technical Report Number 3 (TR-3) for the temperature in Table 4.1. The hydrostatic design stress for the temperature in Table 4.1 shall be determined in a
