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Demonstration and evaluation of an innovative water main rehabilitation technology: spray-on polymeric lining

机译：演示和评估创新的供水修复技术：喷涂聚合物衬里

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Many utilities are seeking innovative rehabilitation technologies to extend the life and fix larger portions of theirnwater distribution systems with current funding levels. The information on the capabilities and applicability ofnnew technologies is not always readily available or easy to obtain from an independent source. To meet thesenneeds, the U.S. Environmental Protection Agency (EPA) developed an innovative technology demonstration programnto evaluate rehabilitation technologies that have the potential to reduce costs and increase theneffectiveness of the operation, maintenance, and renewal of aging water distribution and wastewater conveyancensystems. This paper provides an impartial assessment of the effectiveness and cost of a spray-onnpolymeric lining technology for water main rehabilitation. The spray-on lining technology ultimately resulted inna liner failure, which was discovered during the post-rehabilitation flow test, which was part of the demonstrationnprotocol QA/QC activities. The failure discovery was important in helping to identify material formulation issuesnand subsequent analysis of the potential causes of the failure indicated that moisture conditions (previously notnexperienced in product development and use) prevented a proper chemical reaction from occurring, whichngreatly reduced the material properties, resulting in a lining collapse. Recommendations for the study of importantnissues such as the effect of ambient conditions on the resin curing process, cleaning requirements fornsurface preparation, and other key issues in order to help to better understand the technology are made tonhelp avoid the occurrence of future failures with this technology.
机译：许多公用事业公司正在寻求创新的修复技术，以延长使用寿命并在目前的资金水平下修复大部分供水系统。关于新技术的功能和适用性的信息并不总是容易获得或容易从独立来源获得。为了满足需要，美国环境保护署（EPA）开发了一项创新技术示范计划，以评估可降低成本并提高老化的水分配和废水输送系统的运行，维护和更新的潜力的修复技术。本文对喷水聚合衬里技术对供水总管的有效性和成本进行了公正的评估。喷涂衬里技术最终导致衬里失效，这是在康复后流量测试期间发现的，这是演示协议QA / QC活动的一部分。故障发现对于帮助识别材料配方问题很重要，随后对故障潜在原因的分析表明，潮湿条件（以前在产品开发和使用中没有经验）阻止了适当的化学反应的发生，从而严重降低了材料的性能，导致衬砌崩溃。提出了一些重要的研究建议，例如环境条件对树脂固化工艺的影响，表面准备的清洁要求以及其他关键问题，以帮助更好地理解该技术，从而避免了该技术将来发生故障。

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