secondary pipe

The source of pipe line secondary stress check condition is the stability condition.

管道二次应力校核条件来源于结构的安定性条件.

The inner stresses of the tubes and pipe arrangement stresses are the secondary cause, which accelerated the explosion procedure.

管子内压应力与管系应力加速了爆漏过程，是造成过热器管撕裂爆口的次要原因。

Corrosion scales could form on the pipe wall that serving for long time. Drinking water can suffered from secondary pollution, and hygeian situation directly influences supply water quality.

服务年限长的供水管道内壁会形成腐蚀物，使饮用水受到二次污染，供水管道的卫生状况将直接影响水质。

After the analysis of the factors affecting the secondary air flow, neural network PID control with a predictive model is designed, reducing the interference on the secondary air flow from pipe coupling and total air volume.

在分析了影响二次风流量的因素之后，设计了带有预测模型的神经网络PID控制，减小了管道耦合和总风量对流量控制的影响。

A considerable part of the money supply facilities for a long time without maintenance, management, secondary water supply facilities and frequent overflow pipe leakage; while water pollution is very serious.

有相当一部分供水设施长时间无资金维护、管理，使二次供水设施时常发生溢流和管网漏失；同时水质污染也十分严重。