1、 PE Compound Categorization for Potable Water Applications TN-43/2014 Foreword This technical note was developed and published with the technical help and financial support of the members of the PPI (Plastics Pipe Institute, Inc). The members have shown their interest in quality products by assistin
2、g independent standards-making and user organizations in the development of standards, and also by developing reports on an industry-wide basis to help engineers, code officials, specifying groups, and users. This technical note has been prepared by PPI as a service to the industry. The information
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4、ould not be construed as an endorsement by PPI, which does not endorse the proprietary products or processes of any manufacturer. The information in this report is offered for consideration by industry members in fulfilling their own compliance responsibilities. PPI assumes no responsibility for com
5、pliance with applicable laws and regulations. PPI intends to revise this note from time to time, in response to comments and suggestions from users of this note. Please send suggestions of improvements to the address below. Information on other publications can be obtained by contacting PPI directly
6、 or visiting the web site. The Plastics Pipe Institute, Inc. www.plasticpipe.org April 2014 105 Decker Court, Suite 825, Irving, TX 75062 P: 469-499-1044 F: 469-499-1063 www.plasticpipe.org PE COMPOUND CATEGORIZATION FOR POTABLE WATER APPLICATIONS In potable water applications, an oxidative environm
7、ent can exist due to the continuous presence of disinfectant residuals in water. Accordingly, the PE pipe industry developed a testing methodology and criteria to categorize the performance of PE pipe compounds for potable water applications. This document is only intended to be used for categorizat
8、ion of PE compounds with respect to oxidative stability in this specific environment and is not directly applicable for any other purpose. The categorization of PE pipe compounds can be used in conjunction with other industry documents which should provide design guidance for long-term performance u
9、nder the expected service conditions. ASTM F2263-07 (2011) forms the basis of the qualification testing. PE compounds shall be evaluated for resistance to oxidative degradation by the following test method: Single Point Validation (SPV) Testing The methodology uses the Jana Mode 3 Shift Functions in
10、 an approach analogous to the Popelar Shift Function1for the forecast of Stage II performance of PE pipe compounds. The theory behind the Jana Mode 3 Shift Functions can be found in Jana JP91621. Not less than six (6) test specimens shall be tested at 90C and one stress chosen from Table 1. . Accele
11、rated testing at a single temperature/stress condition is conducted in general accordance with ASTM F2263 with the following modifications: 2. Testing shall be conducted on 4” DR 11 IPS pipe meeting the dimensional requirements of ASTM D3035. 3. The flow rate shall be established such that the avera
12、ge ORP of the test fluid exiting the test specimens remains above 825 mV. 4. The external test environment shall be either air or non-chlorinated water. 5. All failures shall be included, and non-failures may be included, in the calculation of the log average time except as provided by item 7. 6. If
13、 non-mode 3 failures occur such that the log average time is below the minimum requirement in Table 1, testing may be conducted at a lower stress from Table 1. 7. If one specimen fails due to defective test apparatus, sample preparation or other test procedure related anomaly, then log average testi
14、ng time of the remaining five specimens shall be used for compound categorization. Data from not less than five specimens is required for compound categorization. 8. The compound shall be categorized according to Table 1using log average time and the corresponding test stress. Based on these modific
15、ations to ASTM F2263 and the application of the Jana Mode 3 Shift Functions, the minimum log average test times required for PE compound categorization are presented in Table 1. The required test times are presented at three different test stresses. Testing is only required at one stress level. The
16、range 4 of test stresses provides some flexibility to optimize the testing conditions based on the PE compound and an option to test at higher stresses to reduce testing time. Table 1: PE Compound Categorization Requirements Categorization Test Stress, psi 360 400 450 Minimum Log Average Test Time,
17、h Category 1 (CC1) 2,700 1,900 1,200 Category 2 (CC2) 7,400 5,100 3,400 Category 3 (CC3) 16,200 11,100 7,400 1C. H. Popelar, A Comparison of the Rate Process Method and the Bidirectional Shifting Method, in Thirteenth Plastic Fuel Gas Pipe Conference Symposium. 1993. p. 151. 2Jana Technical Report, JP 916, Jana Mode 3 Shift Functions- Alternate Test Methodology for Assessing PE Compound Performance in Potable Water Applications, , March 2012.
