ISO 21809-5:2017规定了ISO 13623中定义的石油和天然气行业管道运输系统中使用的裸管或预涂管外部钢筋混凝土涂层所需材料的鉴定、应用、测试和处理要求。 混凝土的外部应用主要用于埋地或水下管道系统中管道的负浮力和/或管道及其预涂层的机械保护。 ISO 21809-5:2017适用于厚度大于等于25mm的混凝土。

ISO 21809-5:2017 specifies the requirements for qualification, application, testing and handling of materials required for the application of reinforced concrete coating externally to either bare pipe or pre-coated pipe for use in pipeline transportation systems for the petroleum and natural gas industries as defined in ISO 13623. The external application of concrete is primarily used for the negative buoyancy of pipes used in buried or submerged pipeline systems and/or for the mechanical protection of the pipe and its pre-coating. ISO 21809-5:2017 is applicable to concrete thicknesses of 25 mm or greater.