衬环，也可叫做支撑环，它同衬垫作用一样，作用是保护焊缝。
n. grommet
misc. backing ring ; bush ring ; bushingring
... backing pump 旋转油泵；初级抽气泵，前置泵；备用泵 backing ring 衬环；垫环；支承环 backing run 封底焊道 ...
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衬环法兰的适用温度由设计者根据情况决定。
The bushing ring flange suitable temperature is decided by the designer according to the situation.
在套管或衬管与周围的水泥环之间所形成的小间隙，这些间隙是由于在固井期间或固井之后温度或压力的变化所致。
A small gap that can form between the casing or liner and the surrounding cement sheath, most commonly formed by variations in temperature or pressure during or after the cementing process.
埋入部分包括蜗壳座环、尾水锥管、尾水肘管、机坑里衬等。
The embedding part includes volute socket ring, tail water taper pipe, tail water ell, pit liner and so on.
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