1.1 本规程建立了使用寿命周期成本（LCC）分析技术评估替代排水系统设计的程序，使用满足相同功能要求的塑料管。 1.2 LCC技术测量在指定时间段内安装、运行和维护替代排水系统（如工程、施工、维护、修复或更换）的所有相关成本的现值。该惯例还考虑了任何剩余的残值或残值。 1.3 然后，决策者可以使用LCC分析的结果，根据所有成本的现值确定估计总成本最低的备选方案。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 LCC分析是一种经济方法，用于评估在指定项目设计寿命内具有不同现金流特征的备选方案。该方法需要计算能够满足项目功能要求的每个备选方案的LCC，并对其进行比较，以确定在项目设计寿命期内，哪个方案的估计LCC最低。 5.2 当与初始成本较低但未来成本较高的替代方案相比时，低成本成本成本法特别适用于确定替代方案较高的初始成本是否通过降低未来成本（例如，运行维护、修复或更换）在经济上合理。 如果一个设计方案的初始成本和未来成本均低于其他方案，则无需进行LCC分析以表明前者是经济上更可取的选择。

1.1 This practice establishes a procedure for using life cycle cost (LCC) analysis techniques to evaluate alternative drainage system designs, using plastic pipe that satisfy the same functional requirements. 1.2 The LCC technique measures the present value of all relevant costs to install, operate, and maintain alternative drainage systems such as engineering, construction, maintenance, rehabilitation, or replacement over a specified period of time. The practice also accommodates any remaining residual or salvage value. 1.3 The decision maker, using the results of the LCC analysis, can then identify the alternative(s) with the lowest estimated total cost based on the present value of all costs. 1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 LCC analysis is an economic method to evaluate alternatives that are characterized by differing cash flows over the designated project design life. The method entails calculating the LCC of each alternative capable of satisfying the functional requirements of the project and comparing them to determine which have the lowest estimated LCC over the project design life. 5.2 The LCC method is particularly suitable for determining whether the higher initial cost of an alternative is economically justified by reductions in future costs (for example, operating maintenance, rehabilitation, or replacement) when compared to an alternative with lower initial costs but higher future costs. If a design alternative has both a lower initial cost and lower future costs than other alternatives, an LCC analysis is not necessary to show the former is the economically preferable choice.