ISO 20474-9:2017给出了ISO 6165中定义的特定于管道铺设者的安全要求。本标准拟与ISO 20474-1结合使用，ISO 20474-1规定了两个或两个以上土方机械系列通用的一般安全要求。本文件中给出的具体要求优先于ISO 20474-1的一般要求。 ISO 20474-9:2017涉及在其范围内（见ISO 20474-1:2017，附录A）与土方机械有关的所有重大危险、危险情况和事件，这些危险、危险情况和事件发生在按照预期使用或在制造商合理预见的误用情况下。它规定了适当的技术措施，以消除或减少调试、运行和维护期间相关危险、危险情况或事件产生的风险。 ISO 20474-9:2017不适用于发布日期之前制造的机器。

ISO 20474-9:2017 gives the safety requirements specific to pipelayers as defined in ISO 6165. It is intended to be used in conjunction with ISO 20474-1, which specifies general safety requirements common to two or more earth-moving machine families. The specific requirements given in this document take precedence over the general requirements of ISO 20474-1. ISO 20474-9:2017 deals with all significant hazards, hazardous situations and events relevant to the earth-moving machinery within its scope (see ISO 20474-1:2017, Annex A) when used as intended or under conditions of misuse reasonably foreseeable by the manufacturer. It specifies the appropriate technical measures for eliminating or reducing risks arising from relevant hazards, hazardous situations or events during commissioning, operation and maintenance. ISO 20474-9:2017 is not applicable to machines manufactured before the date of its publication.