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。
2
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。
3
The outside steel lagging fastens both ends of the pipe and wrap the gasket ring to realize the tight coupling between pipes.