1、NSF International Standard / American National StandardNSF/ANSI 358-4 - 2018 Polyethylene of Raised Temperature (PE-RT) Tubing and Fittings for Water-Based Ground-Source (Geothermal) Heat Pump SystemsNSF International, an independent, not-for-profit, non-governmental organization, is dedicated to be
2、ing 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. Contact NSF to confirm this revision is current. Users of this Standard may request clarifications and interpretations, o
3、r propose revisions 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.orgi NSF/ANSI 358-4 - 2018 N
4、SF International Standard/ American National Standard for Plastics Polyethylene of Raised Temperature (PE-RT) Tubing and Fittings for Water-Based Ground-Source (Geothermal) Heat Pump Systems Standard Developer NSF International Designated as an ANSI Standard March 19, 2018 American National Standard
5、s Instituteii Prepared by The NSF Joint Committee on Plastics Recommended for adoption by The NSF Council of Public Health Consultants Adopted by The NSF International March 2018 Published by NSF International PO Box 130140, Ann Arbor, Michigan 48113-0140, USA For ordering copies or for making inqui
6、ries with regard to this Standard, please reference the designation “NSF/ANSI 358-4 2018.” Copyright 2018 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 microfil
7、m, without permission in writing from NSF International. Printed in the United States of America.iii Disclaimers1NSF, 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 f
8、indings 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 use, interpretati
9、on 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 other national standards-setting organizatio
10、ns 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 of performance criteria measurable by exami
11、nation 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 provided, are intended to assist in understanding their adjacent standard requirements. However, the illustrations may no
12、t 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, the Annexes are not considered an integral par
13、t of NSF Standards. The Annexes are provided as general guidelines to the manufacturer, regulatory agency, user, or certifying organization. 1The information contained in this Disclaimer is not part of this American National Standard (ANS) and has not been processed in accordance with ANSIs requirem
14、ents 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 necessary for conformance to the Standard. This page is intentionally left blank.v Contents 1 General . 1 1.1 Purpose 1
15、1.2 Scope . 1 2 Normative references . 1 3 Definitions . 2 4 Material requirements . 3 4.1 Plastic materials . 3 4.2 Long-term strength of plastic tubing . 3 4.3 Hydrostatic design 3 5 General requirements . 4 5.1 Polyethylene of Raised Temperature tubing 4 5.2 Fittings for Polyethylene of Raised Te
16、mperature tubing 4 5.3 Chemical resistance . 4 5.4 Mechanical joints 5 5.5 Constant tensile load joint test . 5 5.6 Joining 5 6 Marking requirements . 5 6.1 Tubing marking 5 6.2 Fitting marking 6 6.3 Manufacturers instructions 6 7 Quality assurance . 6 7.1 General. 6 7.2 Start-up and qualification o
17、f molds . 6 7.3 Quality assurance records . 7 7.4 Production code identification 7 7.5 Number of test specimens . 7 This page is intentionally left blank.vii Foreword2Geothermal technology has been used in North America for decades and is experiencing tremendous interest. In 2009, the NSF Joint Comm
18、ittee 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 North American standard addressing all relevant aspects of earth energy sy
19、stems. 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 material types. NSF/ANSI 358-4 addresses products in polyethylene of raised
20、 temperature (PE-RT) tubing 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 Standards Institute. Suggestions for improvement of this Standard ar
21、e 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 Department, P.O. Box 130140, Ann Arbor, Michigan, 48113-0140,
22、 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 ANS. Therefore, this Foreword may contain material that has not been subjected to public review or a consensus process. In ad
23、dition, it does not contain requirements necessary for conformance to the Standard. This page is intentionally left blank.1 2018 NSF NSF/ANSI 358-4 2018 NSF/ANSI Standard for Plastics Polyethylene of Raised Temperature (PE-RT) Tubing and Fittings for Water-Based Ground-Source (Geothermal) Heat Pump
24、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. 1.2 Scope The physical and performance requirements in th
25、is Standard apply to plastic piping system components as well as non-plastic components of the ground loop heat exchanger including, but not limited to, polyethylene of raised temperature (PE-RT) tubing and fittings used in water-based ground-source heat pump systems. This standard does not cover re
26、frigerant-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, constitute provisions of this NSF Standard.
27、 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 references, the most recent version shall be r
28、eferenced. These are normative references for Polyethylene of Raised Temperature (PE-RT) tubing and Fittings for Water-Based Ground-Source (Geothermal) Heat Pump Systems. ASTM D543 Standard Practices for Evaluating the Resistance of Plastics to Chemical Reagents3ASTM D2290 Standard Test Method for A
29、pparent Hoop Tensile Strength of Plastic or Reinforced Plastic Pipe3ASTM D2837 Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastics Pipe Products3ASTM F412. Terminology Relating to Plastic Piping Systems3ASTM F1055,
30、Standard Specification for Electrofusion Type Fittings for Outside Diameter Controlled Polyethylene and Crosslinked Polyethylene (PEX) Pipe and tubing3 3American Society for Testing Materials (ASTM), 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959 . 2018 NSF NSF/ANSI 358-4 2018 2 ASTM F1588
31、Standard Test Method for Constant Tensile Load Joint Test (CTLJT)3ASTM F1807. Standard Specification for Metal Insert Fittings Utilizing a Copper Crimp Ring for SDR9 Cross-linked Polyethylene (PEX) Tubing and SDR9 Polyethylene of Raised Temperature (PE-RT) Tubing3ASTM F2080. Standard Specification f
32、or Cold-Expansion Fittings with Metal Compression Sleeves for Cross-linked Polyethylene (PEX) Pipe and SDR9 Polyethylene of Raised Temperature (PE-RT) Tubing3ASTM F2159. Standard Specification for Plastic Insert Fittings Utilizing a Copper Crimp Ring for SDR9 Cross-Linked Polyethylene (PEX) Tubing a
33、nd SDR9 Polyethylene of Raised Temperature (PE-RT) 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/ Aluminum/Cross-linked Polyethylene (PEX-AL-PEX) Tubing3ASTM F2623.
34、 Standard Specification for Polyethylene of Raised Temperature (PE-RT) SDR9 Tubing3CAN/CSA B137.18. Polyethylene of Raised Temperature (PE-RT) Tubing Systems for Pressure Applications4PPI TR-3 Policies and Procedures for Developing Hydrostatic Design Basis (HDB), Hydrostatic Design Stresses (HDS), P
35、ressure Design Basis (PDB), Strength Design Basis (SDB), and Minimum Required Strength (MRS) Ratings for Thermoplastic Piping Materials or Pipe5PPI TR-4 PPI Listing of Hydrostatic Design Basis (HDB), Hydrostatic Design Stress (HDS), Strength Design Basis (SDB), Pressure Design Basis (PDB) and Minimu
36、m Required Strength (MRS) Ratings for Thermoplastic Piping Materials or Pipe53 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, lubrica
37、nts, modifiers, pigments, or curing agents. 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., tubing and fit
38、tings) that directly affect the fit and function, or the capacity of making a sound joint, or both. 3.4 fitting: A piping component 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
39、systems that use the ground, groundwater, or surface water as a heat source or heat sink. Systems can be further described as ground-coupled, groundwater and surface water heat pump systems. 4Canadian Standards Association (CSA), 5060 Spectrum Way. Suite 100, Mississauga Ontario, Canada L4W 5N6 . 5P
40、lastics Pipe Institute (PPI), 105 Decker Court, Suite 825. Irving, TX 75062 . 2018 NSF NSF/ANSI 358-4 2018 3 3.6 hydrostatic design basis (HDB): One of a series of established stress values specified in ASTM D2837 for a plastic compound, obtained by categorizing the long-term hydrostatic strength de
41、termined in accordance with ASTM D2837. 3.7 hydrostatic 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 tubing will not occur. This stress is circumferential when internal hydrostatic wat
42、er pressure is applied. 3.8 joint: The location at which two pieces of tubing or a tubing and a fitting are connected together. Various joint types not defined in this standard shall be defined by ASTM F412. 3.9 mechanical joint: a connection between two pieces of pipe or a pipe and a fitting using
43、a physical force to establish a seal or alignment. 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 essent
44、ial ingredient one or more organic polymeric substances 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 t
45、hat tubing is capable of withstanding continuously with a high degree of certainty that failure of the tubing 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
46、quality control: The methods used to ensure that a 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 thermop
47、lastic: noun A plastic that can be repeatedly softened by heating and hardened by cooling through a temperature range characteristic of the plastic, and in the softened state, can be shaped by flow through molding or extrusion. adj. Capable of being repeatedly softened by heating and hardened by coo
48、ling through a temperature range characteristic of 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 polyethylene of raised temperature pipe shall meet the material requirements of ASTM
49、F2623. 4.2 Long-term strength of plastic tubing Materials for use in plastic tubing 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. 2018 NSF NSF/ANSI 358-4 2018 4 Table 4.1 Minimum hydrostatic design basis Plastic Material HDB at 23
