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首页> 外文会议>2004 AGA operating section proceedings >Correlating Aldyl “A” and Century PE Pipe Rate ProcessMethod Projections With Actual Field Performance
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Correlating Aldyl “A” and Century PE Pipe Rate ProcessMethod Projections With Actual Field Performance

机译：将Aldyl“ A”和Century PE管道速率处理方法的预测结果与实际现场性能进行关联

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The recent Department of Transportation Advisory Bulletin, “Notification of thernSusceptibility to Premature Brittle-Like Cracking of Older Plastic Pipe” cited lowerrnductile inner wall Aldyl “A” and Century polyethylene (PE) pipe as two materialsrnthat were known to be susceptible to brittle-like cracking or slit failures. Manyrnmiles of these materials are still in service in the United States. The key questionrnis – what is the projected life of these PE pipes still in the ground? The RaternProcess Method (RPM) is used to project performance (lifetime) of PE materialsrnat their in-ground temperatures and pressures based on both internal pressurernas the primary load and secondary loads such as rock impingement andrnsqueeze-off.rnThis paper will provide a discussion on the Rate Process Method. RPM involvesrnexhuming samples of pipe from service and subjecting them to laboratoryrnelevated temperature sustained pressure testing that results in slit failures.rnThese slit or SCG (slow crack growth) failures are the long-term failure mode forrnPE materials. A three-coefficient equation is then used to project performance atrnactual service temperatures and pressures. RPM testing is conducted not onlyrnwith pressure as the primary load, but is also used to investigate secondary loadsrnsuch as rock impingement, deflection, bending and squeeze-off.rnRPM testing was conducted on exhumed Aldyl “A” PE pipe. The RPM projectedrnperformance is correlated with actual field experience from two gas utilities forrncontrol pipe (primary load only), indented pipe (to simulate rock impingement)rnand squeezed pipe. This paper also correlates control, indented and squeezedrnRPM projections for exhumed Century PE pipe with its corresponding fieldrnexperience from another gas utility.
机译：最近的运输部咨询公告“对旧塑料管的易碎脆性开裂的敏感性的通知”提到了低延性内壁Aldyl“ A”和Century聚乙烯（PE）管是已知易受类似脆性影响的两种材料。开裂或开裂故障。这些材料的许多英里仍在美国使用。关键问题–这些PE管道仍在地下的预计寿命是多少？ RaternProcess方法（RPM）用于基于内部压力，主要载荷和次要载荷（例如，岩石撞击和挤压）来预测PE材料在其地下温度和压力下的性能（寿命）。费率处理方法。 RPM涉及从使用中取出管道样品，并对其进行实验室高温持续压力测试，从而导致切缝故障。这些切缝或SCG（缓慢裂纹扩展）故障是rnPE材料的长期故障模式。然后使用三系数方程式来预测实际使用温度和压力下的性能。 RPM测试不仅以压力作为主要负载，而且还用于研究次生负载，例如岩石撞击，挠曲，弯曲和挤压。rnRPM测试是在挖掘出的Aldyl“ A” PE管上进行的。 RPM预测的性能与两个燃气公用事业公司的控制管（仅主载荷），凹进管（模拟岩石撞击）和压紧管的实际现场经验相关。本文还将挖掘出的Century PE管的控制，压入和压缩RPM预测与另一家燃气公司的相应现场经验进行了关联。

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