1、NSF International Standard / American National StandardNSF/ANSI 358-2 - 2017Polypropylene Pipe and 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 leading global provider
2、 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 revisions by contacti
3、ng: 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/ANSI 358-2 2017 NSF International Standard/ Americ
4、an National Standard for Plastics Polypropylene Pipe and Fittings for Water-Based Ground-Source “Geothermal” Heat Pump Systems Standard Developer NSF International Designated as an ANSI Standard December 18, 2017 American National Standards Institute ii Prepared by The NSF Joint Committee on Plastic
5、s Recommended for Adoption by The NSF Council of Public Health Consultants Adopted by NSF International December 2012 Revised December 2017 Published by NSF International PO Box 130140, Ann Arbor, Michigan 48113-0140, USA For ordering copies or for making inquiries with regard to this Standard, plea
6、se reference the designation “NSF/ANSI 385-2 2017.” Copyright 2018 NSF International Previous editions 2013 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 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 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 relia
9、nce 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 safe
10、ty 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 testi
11、ng 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 r
12、equirements 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 Standa
13、rds. 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 requirements for an ANS
14、. 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-sary for conformance to the Standard. This page is intentionally left blank.v Contents 1 General . 1 1.1 Purpose 1 1.2 Scope . 1
15、2 Normative references . 1 3 Definitions . 2 4 Material requirements . 3 4.1 Plastic materials . 3 4.2 Materials . 3 4.3 Long-term strength of polypropylene pipe . 3 5 General requirements . 3 5.1 Polypropylene pipe . 3 5.2 Polypropylene fittings . 3 5.3 Chemical resistance . 3 5.4 Joining 4 6 Marki
16、ng requirements . 4 6.1 Pipe marking 4 6.2 Fitting marking 5 6.3 Manufacturers instructions 5 7 Quality assurance . 5 7.1 General. 5 7.2 Start-up and qualification of molds . 5 7.3 Calibration 6 7.4 Quality assurance records . 6 7.5 Production code identification 6 7.6 Number of test specimens . 6 T
17、his page is intentionally left blank.vii Foreword2 Geothermal technology has been used in North America for decades 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 in
18、dustry. 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 systems. It is the intent of this Standard to assist in a more consistent approval and mainstream code adoption of the
19、 geothermal piping systems technology. This Standard will be separated into four separate documents based on material types. NSF/ANSI 358-2 addresses products in polypropylene systems. This edition of the Standard contains the following revisions: Issue 2 This revision updated normative references a
20、nd revised metric conversions for consistency. 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 are welcome. This Standard is maintained on a Continuous
21、Maintenance schedule and can be opened for comment at any time. Comments should be sent to Chair, Joint Committee on Drinking Water Treatment Units at standardsnsf.org, or c/o NSF International, Standards Department, P.O. Box 130140, Ann Arbor, Michigan 48113-0140, USA. 2The information contained in
22、 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 addition, it does not contain require
23、ments neces-sary for conformance to the Standard. This page is intentionally left blank.1 2018 NSF NSF/ANSI 358-2 2017 NSF International Standard for Plastics Polypropylene Pipe and Fittings for Water-Based Ground-Source “Geothermal” Heat Pump Systems 1 General 1.1 Purpose This Standard establishes
24、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 this standard apply to plastic piping system components as
25、 well as non-plastic components of the ground loop heat exchanger including but not limited to pipes and fittings used in water-based ground-source heat pump systems This Standard is intended for ground loop heat exchangers with a maximum temperature and pressure of 140 F (60C) at 100 psi. Water-bas
26、ed ground-source heat pump systems commonly include the use of anti-freeze, heat transfer fluids or other chemical additives. 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 sys
27、tems within buildings. 2 Normative references The following documents contain provisions that, through reference, 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 encourage
28、d to investigate the possibility of applying the recent editions of the documents indicated below. The most recent published edition of the document shall be used for undated references. Normative References for Polypropylene Pipe and Fittings for Water-Based Ground-Source “Geothermal” Heat Pump Sys
29、tems: ASTM D2290-12 Standard Test Method for Apparent Hoop Tensile Strength of Plastic or Reinforced Plastic Pipe by Split Disk Method3ASTM D2837-13 Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastic Pipe Products3A
30、STM D543-06 Standard Practices for Evaluating the Resistance of Plastics to Chemical Reagents3ASTM F1588-96 (2015) Standard Test Method for Constant Tensile Load Joint Test (CTLJT)33American Society for Testing Materials (ASTM), 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959 . 2018 NSF NSF/
31、ANSI 358-2 2017 2 ASTM F412-12 Standard Terminology Relating to Plastic Piping Systems3 ASTM F2389-10 Standard Specification for Pressure-rated Polypropylene (PP) Piping Systems33 Definitions Terms used in this Standard that have a specific technical meaning are defined here. 3.1 compound: A mixture
32、 of polymers with other ingredients such as fillers, stabilizers, catalysts, processing aids, lubricants, 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 intentiona
33、lly incorporated in a product. 3.3 critical dimensions: Dimensions of a product (e.g., pipes and fittings) 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
34、 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 ground-coupled, groundwater and surface water heat pump systems. 3.6 hydro
35、static design basis (HDB): One of a series of established stress values specified in ASTM D28373for a plastic compound, obtained by categorizing the long-term hydrostatic strength determined in accordance with ASTM D28373. 3.7 hydrostatic design stress (HDS): The estimated maximum tensile stress a m
36、aterial 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 at which two pieces of pipe or a pipe and a fitting are connected toget
37、her. Various joint types not defined in this standard shall be defined by ASTM F4123. 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
38、material that contains as an essential 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 p
39、ressure at a specified temperature that a pipe is capable of withstanding continuously 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
40、 of quality control testing. 3.14 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 rework material: A material from a manufacturers own production that has been
41、reground or 2018 NSF NSF/ANSI 358-2 2017 3 pelletized for reuse by that same manufacturer. 3.16 steady-state: An operational condition of the manufacturing process that does not change with time. 3.17 thermoplastic: noun A plastic that can be repeatedly softened by heating and hardened by cooling th
42、rough 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 cooling through a temperature range characteristic of the plastic, and able in the softened sta
43、te to be shaped by flow into articles by molding or extrusion. 3.18 virgin material: A material in the form of pellets, granules, powder, floc, or liquid that has not been subjected to use or processing other than that required for its initial manufacture. 4 Material requirements 4.1 Plastic materia
44、ls Plastic piping system components and related materials shall be produced from virgin plastics or clean rework materials. 4.2 Materials The use of clean, rework material of the same formulation and physical properties from the same production facility is acceptable provided the finished products m
45、eet the requirements of this standard. Plastic piping system components and related materials shall be manufactured to prevent contamination. Fittings requiring exposed metallic components shall not be suitable for burial. Materials for polypropylene (PP) pipe and fittings shall meet the minimum phy
46、sical properties and long-term strength requirements of ASTM F23893. 4.3 Long-term strength of polypropylene pipe Minimum Required Strength (MRS) and Categorized Required Strength (CRS) The MRS and CRS for polypropylene material shall comply with ASTM F23893. 5 General requirements 5.1 Polypropylene
47、 pipe Polypropylene pipe shall conform to ASTM F23893. Polypropylene pipe shall not be threaded. 5.2 Polypropylene fittings Polypropylene fittings shall conform to ASTM F23893. U-bends containing assembled joints shall comply with the hydrostatic pressure tests in 8.5 of ASTM F23893. Each test speci
48、men shall contain assembled joints consistent with how the product is sold. 5.3 Chemical resistance Plastic pipe and plastic fitting materials in direct contact with heat transfer fluids shall not exhibit a change 2018 NSF NSF/ANSI 358-2 2017 4 in weight greater than 0.5% or a change in apparent ten
49、sile strength greater than 12% when tested according to 5.3.1 through 5.3.4. 5.3.1 Determine the resistance to the chemicals in Table 5.1 in accordance with ASTM D5433. 5.3.2 Ring specimens shall be cut from a minimum 1 in (2.54 cm) diameter pipe where available. The specimens shall be in (1.27 cm) wide with a in (0.64 cm) wide reduced section. For materials that are not readily available as minimum 1 in (2.54 cm) diameter pipe, the test specimen shall be a plaque of material x 2 x 4 in (0.64 x 5 x 10 cm) with a 1 in wide (2.54 cm) reduce
