In a vertical pipe, actual concentration of materials under delivery is greater than the one at its outlet due to lagging effect.

颗粒滞留效应，将导致在垂直管流中物料的当地浓度大于输送浓度。

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But they 've got to be wrapped in lagging, remember. and in two places I need to cross a conduit with a 35 millimetres cold feed pipe. There's just not enough space.

但管外还要包隔热层而且电线管在两处要与35毫米的冷水管交叉，地方恰好不够。

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The outside steel lagging fastens both ends of the pipe and wrap the gasket ring to realize the tight coupling between pipes.

外钢套扣住钢管两端并包裹密封圈。实现钢管密封连接。

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