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适用范围：<p id="s00002">1.1 This specification covers polyethylene (PE) plastic tubing in outside diameters and SDR<span class="unicode">x2019;</span>s that are pressure rated for water. Included are requirements for PE compounds, and requirements and test methods for PE plastic tubing workmanship, dimensions, elevated temperature sustained pressure, burst pressure and marking. </p> <p id="s00003">1.2 The text of this specification references notes, footnotes, and appendixes which provide explanatory material. These notes and footnotes shall not be considered as requirements of the specification. Notes and footnotes in tables and figures, and Supplementary Requirements are requirements of the specification. </p> <p id="s00004">1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. <p class="desc" id="N00001"> <span class="smallcap">Note</span> 18212;Joining PE plastic tubing with fittings that require flaring the tubing is not recommended because Practice <a href="http://myastm.astm.org/SUBSCRIPTION/NewValidateSubscription.cgi?-HTML"></a>, the technique used to make the flare has been withdrawn (discontinued). </p> <p class="desc"> <span class="smallcap">Note</span> 28212;References and PE compound descriptions for PE2305, PE2406, PE3306, PE3406, and PE3408 have been removed due to changes in Specification <a href="http://myastm.astm.org/SUBSCRIPTION/NewValidateSubscription.cgi?D3350-HTML">D3350</a> and PPI TR-3. For removed designations, refer to previous editions of Specification D2737, Specification <a href="http://myastm.astm.org/SUBSCRIPTION/NewValidateSubscription.cgi?D3350-HTML">D3350</a>, PPI TR-3 and PPI TR-4. The removal of these PE compounds does not affect pipelines that are in service. PE compounds and material designations resulting from changes in Specification <a href="http://myastm.astm.org/SUBSCRIPTION/NewValidateSubscription.cgi?D3350-HTML">D3350</a> and PPI TR-3 are addressed in Section 5.</p> </p> <p id="s00005">1.4 <span class="italic"><span class="med">The following safety hazards caveat pertains only to the test methods portion, Section 7, of this specification: </span><span class="italic">This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.</span></span>