Practical application shows that utilization requirements can be met by adopting the doubletube plate heat exchanger with mechanically expanded tube.
实际使用表明，采用机械胀管法制造的双管板换热器，可以满足使用要求。
2
The problem how to discharge air in the doubletube underside feed and underside return flow heating system is solved by improvement of system design.
并通过改进系统设计较好地解决了下供下回式热水供暖系统排放空气的问题。
3
The presentation of usage of liquid column manometer. The correct use method and error correction of U tube manometer and doubletube differential pressure gauge were analysed.