在 南明 市政给排水、建筑给排水及工业流体输送工程中，柔性铸铁管与PE管选型对比是决定管材适配性、工程稳定性与运维成本的核心决策环节，明确两类管材的适用场景是选对管材的关键前提。柔性铸铁管（span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>span>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