A float collar is placed at the top of the floatjoint and a float shoe placed at the bottom to prevent reverse flow of cement back into the casing after placement.
浮箍是放置于浮动接头之上的，而浮鞋则是放置于浮动接头之下，以防止水泥浆回流到套管内。
2
Internal expansion joint shall be adopted to single tube side float head heat exchanger for avoiding from large temperature difference stress, when design pressure on shell side is larger.