求翻译：由于我方已安装完毕的部分管道在土建施工单位平整场地被破坏，按照业主和监理要求必须更换，更换部位在细格栅和初沉池之间，长度为DN300 HDPE管道41米，DN100给水管道50米是什么意思？

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As part of our side had been installed in pipeline construction site formation units were destroyed, in accordance with the requirements for owners and need to be replaced, the replacement grille and a breakdown in parts early DN sunken pool, a length of between 300 100 DN HDPE pipeline 41 meters, 5

Because we have installed the partial pipelines which finished in the construction construction smooth location to destroy, must replace according to the owner and the overseeing request, the replacement spot and initially sinks in the thin grill between the pond, the length is DN300 the HDPE pipeli

As our part of the pipe has been installed in the destruction of the civil engineering unit flat ground, according to the requirement owner and supervisor must be replaced, the replacement of parts between the fine grid and primary sedimentation, DN300 HDPE pipe 41 metres in length, DN100 pipeline 5

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