PPI TN-17-2013 Crosslinked Polyethylene (PEX) Pipe & Tubing.pdf

1、 Crosslinked Polyethylene (PEX) Pipe revised in April 2009 and in February 2013. 105 Decker Court, Suite 825, Irving, TX 75062 P: 469-499-1044 F: 469-499-1063 www.plasticpipe.org1 CROSSLINKED POLYETHYLENE (PEX) PIPE density; sustained pressure test; burst pressure; environmental stress cracking test

2、; degree of crosslinking; stabilizer functionality; and oxidative stability in potable chlorinated water applications. Extracted, with permission, from ASTM F876 - Standard Specification for Crosslinked Polyethylene (PEX) Tubing, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken

3、, PA 19428. A copy of the complete standard may be purchased from ASTM International, www.astm.org 10.2 ASTM F877 This specification covers requirements, test methods, and marking requirements for system components when tested with nominal SDR9 crosslinked polyethylene tubing as a system. Systems ar

4、e intended for 100 psi (0.69 MPa) water service up to and including a maximum working temperature of 180F (82C). Requirements and test methods are included for materials, workmanship, dimensions and tolerances, burst pressure, sustained pressure, excessive temperature and pressure, and thermo-cyclin

5、g tests. The components covered by this specification are intended for use in residential and commercial, hot and cold, potable water distribution systems or other applications such as municipal water service lines, radiant panel heating systems, hydronic baseboard heating systems, snow and ice melt

6、ing systems, and building services pipe. Extracted, with permission, from ASTM F877 - Standard Specification for Crosslinked Polyethylene (PEX) Plastic Hot- and Cold-Water Distribution Systems, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete s

7、tandard may be purchased from ASTM International, www.astm.org 10.3 ASTM F2023 This test method describes the general requirements for evaluating the long-term oxidative resistance of cross-linked polyethylene (PEX) tubing produced in accordance with ASTM F876 or PEX tubing/fitting systems produced

8、in accordance with ASTM F877 by exposure to hot, chlorinated water used in hot- and cold-water distribution systems. This test method is applicable to PEX tubing and systems used for transport of potable water containing free-chlorine for disinfecting purposes. The oxidizing potential of the test-fl

9、uid specified in this test method exceeds that typically found in potable water systems across the United States. 8 NOTE: Other known disinfecting systems (chlorine dioxide, ozone, and chloramines) are currently used for protection of potable water; however, free-chlorine is by far the most common s

10、ystem in use today. Chloramines have been tested in comparison to free-chlorine utilizing ASTM F2023 by PPI and found to be significantly less aggressive to PEX piping. Please refer to the PPI Technical Report Statement A on the PPI website (www.plasticpipe.org) for more details. Disinfecting system

11、s other than chlorine and chloramines have not been evaluated by this method. Extracted, with permission, from ASTM F2023 Standard Test Method for Evaluating the Oxidative Resistance of Crosslinked Polyethylene (PEX) Tubing and Systems to Chlorinated Hot Water, copyright ASTM International, 100 Barr

12、 Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, www.astm.org 10.4 ASTM F2657 This test method describes the procedure for exposing crosslinked polyethylene (PEX) tubing produced in accordance with Specification F876 to natural (su

13、nlight) ultraviolet (UV) radiation and evaluating the effects of the exposure. This test method outlines the requirements for specimen size and preparation, exposure orientation, minimum UV exposure energy, post exposure testing and reporting. Extracted, with permission, from ASTM F2657 - Standard T

14、est Method for Outdoor Weathering Exposure of Crosslinked Polyethylene (PEX) Tubing, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, www.astm.org 10.5 ASTM F2788 This specification covers metr

15、ic-sized crosslinked polyethylene (PEX) pipe that is outside diameter controlled, made in nominal pipe dimension ratios, and pressure rated for water at three temperatures (see Appendix X1). Included are requirements and test methods for material, workmanship, dimensions, burst pressure, hydrostatic

16、 sustained pressure, excessive temperature-pressure, environmental stress cracking, stabilizer functionality, bent-pipe hydrostatic pressure, oxidative stability in potable chlorinated water, and degree of crosslinking. Requirements for pipe markings are also given. The pipe covered by this specific

17、ation is intended for buried pressure piping applications (such as, industrial and general-purpose pipelines, potable water pipelines, fire extinguishing pipelines). This specification also includes carbon black requirements for PEX pipe used for aboveground pressure piping applications. Extracted,

18、with permission, from ASTM F2788 Standard Specification for Metric-sized Crosslinked Polyethylene (PEX) Pipe, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, www.astm.org. 9 10.6 ASTM F2818 Th

19、is specification covers requirements and test methods for material dimensions and tolerances, hydrostatic burst strength, chemical resistance, and impact resistance of PEX pipe and tubing for use in fuel gas mains and services for direct burial applications. Extracted, with permission, from ASTM F28

20、18 Standard Specification for Specification for Crosslinked Polyethylene (PEX) Material Gas Pressure Pipe and Tubing, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, www.astm.org 10.7 ASTM F28

21、29 This specification covers performance requirements, test methods, and marking requirements for metric-sized system components (electrofusion and mechanical fittings) when joined with metric-sized PEX pipe (Specification F2788) as a system, intended for use up to and including a maximum working te

22、mperature of 200F (93C ). The following performance requirements are described for the fittings 68F (20C) hydrostatic strength, 176F (80C) hydrostatic strength, short-term internal pressure resistance, resistance to tensile loads, cohesive resistance for electrofusion fittings at both the minimum an

23、d maximum recommended temperatures, impact resistance for saddle fittings, and leak tightness and pull out tests for mechanical fittings. The metric-sized components covered by this specification are intended for the above-ground and buried pressure piping applications, such as industrial & general-

24、purpose pipelines, potable water pipelines, and fireextinguishing pipelines. Extracted, with permission, from ASTM F2829 - Standard Specification for Metric-Sized Crosslinked Polyethylene (PEX) Pipe Systems, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of

25、the complete standard may be purchased from ASTM International, www.astm.org 10.8 AWWA C904 This standard describes Crosslinked Polyethylene (PEX) pressure pipe made from material having a standard PEX material designation code of PEX 1006 in ASTM F876 for use as underground water service lines in s

26、izes in. (12mm) through 3 in. (76mm) that conform to a standard dimension ratio of SDR9. The purpose of this standard is to provide the requirements for materials, design, testing, inspection, and shipping of PEX pipe for use as service lines in the construction of underground water distribution sys

27、tems. This standard can be referenced for purchasing and receiving PEX pressure pipe and as a guide for manufacturing PEX pressure pipe. 10 10.9 CSA B137.5 This Standard specifies requirements for crosslinked polyethylene (PEX) tubing systems, comprised of tubing and fittings. Tubing covered by this

28、 Standard is made in Standard Dimensional Ratio 9 (SDR 9). Systems are pressure rated at three temperatures: 1105 kPa at 23C, 690 kPa at 82C, and 550 kPa at 93C, with a maximum working pressure of 690 kPa at 82C. Systems are intended for use in potable water distribution systems or other application

29、s, including municipal water service lines, reclaimed water distribution, radiant panel heating and cooling systems, hydronic baseboard heating systems, snow and ice melting heating systems, building services piping, compressed air distribution, and ground source geothermal systems, provided that th

30、e PEX tubing systems covered herein comply with the applicable code requirements. Residential and commercial systems are included. With the permission of the Canadian Standards Association (operating as CSA Group), material is reproduced from CSA Group standards, B137.5-09, Crosslinked polyethylene

31、(PEX) tubing systems for pressure applications which is copyrighted by CSA Group, 5060 Spectrum Way, Suite 100, Mississauga ON, L4W 5N6.This reprinted material is not the complete and official position of CSA Group on the reference subjects, which is represented solely by each standard in its entire

32、ty. For more information or to purchase standards from CSA Group, please visit http:/shop.csa.ca/ or call 1-800-463-6727 10.10 PPI TR-3 This technical report presents the policies and procedures used by the HSB (Hydrostatic Stress Board) of the PPI (Plastics Pipe Institute) to develop recommendation

33、s of estimated long-term hydrostatic strength for commercial thermoplastic piping materials. Recommendations are published in PPI technical report TR-4, “PPI Listing of Hydrostatic Design Basis, and Hydrostatic Design Stress (HDS), Strength Design Basis (SDB), Pressure Design Basis (PDB) and Minimum

34、 Required Strength (MRS) Ratings for Thermoplastic Piping Materials or Pipe”. Listings are developed from data submitted to the HSB by the manufacturer. These data are obtained according to the basic method outlined in ASTM D1598, “Standard Test Method for Time-to-Failure of Plastic Pipe Under Const

35、ant Internal Pressure.” The general method used to evaluate the data is described in ASTM D2837, “Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials,” with additional requirements as specified in PPI TR-3. TR-3 and TR-4 also provide the recommended pipe mate

36、rial designation codes for PEX materials. An example of this pipe material designation code is as follows: PEX 1006 is a crosslinked polyethylene (the PEX abbreviation is in accordance with ASTM D1600) which has a 630 psi maximum recommended HDS (0.5 design factor) at 73F (23C). 11 Unlike thermoplas

37、tic PE material designation codes, the first two digits of the PEX material designation code cannot be used to describe its short-term properties. The first digit of the PEX material designation code is for chlorine resistance tested in accordance with ASTM F2023. o A digit “1” indicates the PEX tub

38、ing has been tested and meets the F876 requirement for minimum chlorine resistance at the end use condition of 25% at 140F (60C) and 75% at 73.4F (23C). o A digit “3” indicates the PEX tubing has been tested and meets the F876 requirement for minimum chlorine resistance at the end use condition of 5

39、0% at 140F (60C) and 50% at 73.4F (23C). o A digit “5” indicates the PEX tubing has been tested and meets the F876 requirement for minimum chlorine resistance at the end use condition of 100% at 140F (60C). o A digit “0” indicates it does not meet this requirement or it has not been tested. The seco

40、nd digit of the PEX material designation code is used to indicate the level of UV resistance for the PEX material when tested in accordance with ASTM F2657. o A digit “1” indicates the PEX tubing has been tested and meets the F876 requirement for minimum UV resistance of 1 month. o A digit “2” indic

41、ates the PEX tubing has been tested and meets the F876 requirement for minimum UV resistance of 3 months. o A digit “3” indicates the PEX tubing has been tested and meets the F876 requirement for minimum UV resistance of 6 months. o A digit “0” indicates it does not meet any minimum UV resistance re

42、quirement or it has not been tested. The last two digits of the PEX material designation code represent the PPI recommended HDS (0.5 design factor) at 73.4F (23C) divided by one hundred. 10.11 NSF/ANSI Standard 14 This standard establishes minimum physical, performance, quality assurance, marking, a

43、nd record keeping requirements for plastic piping components and related materials. 10.12 NSF/ANSI Standard 61 This standard is intended to cover specific materials or products that come into contact with drinking water, drinking water treatment chemicals, or both. The primary focus of the standard

44、is on contaminants or impurities imparted indirectly to drinking water. PEX tubing used in the transport of potable water must be marked “POTABLE” or have the seal of a lab that has evaluated the tubing against the requirements of NSF/ANSI Standard 61. 12 11.0 PEX Fittings In addition to the above s

45、tandards, requirements and test methods for PEX tubing and piping, there are also specific product standards for PEX fitting systems. These product standards include, but are not limited to: ASTM F877 Standard Specification for Crosslinked Polyethylene (PEX) Hot- and Cold-Water Distribution Systems

46、ASTM F1055 Standard Specification for Electrofusion Type Polyethylene Fittings for Outside Diameter Controlled Polyethylene and Crosslinked Polyethylene (PEX) Pipe and Tubing ASTM F1807 Standard Specification for Metal Insert Fittings Utilizing a Copper Crimp Ring for SDR9 Crosslinked Polyethylene (

47、PEX) Tubing and SDR9 Polyethylene of Raised Temperature (PE-RT) Tubing ASTM F1865 Standard Specification for Mechanical Cold Expansion Insert Fitting With Compression Sleeve for Crosslinked Polyethylene (PEX) Tubing ASTM F1960 Standard Specification for Cold Expansion Fittings with PEX Reinforcing R

48、ings for Use with Crosslinked Polyethylene (PEX) Tubing ASTM F2080 Standard Specification for Cold-Expansion Fittings With Metal Compression-Sleeves for Crosslinked Polyethylene (PEX) Pipe ASTM F2159 Standard Specification for Plastic Insert Fittings Utilizing a Copper Crimp Ring for SDR9 Crosslinke

49、d Polyethylene (PEX) Tubing and SDR9 Polyethylene of Raised Temperature (PE-RT) Tubing ASTM F2434 Standard Specification for Metal Insert Fittings Utilizing a Copper Crimp Ring for SDR9 Cross-linked Polyethylene (PEX) Tubing and SDR9 Crosslinked Polyethylene/Aluminum/Cross-linked Polyethylene (PEX-AL-PEX) Tubing 12.0 Acknowledgements This technical note was developed, reviewed, and approved by the Building and Construction Division (BCD) of the Plastics Pipe Institute.