弯管是火力发电厂主蒸汽管道系统中较易损坏的部件之一。

Elbow is one of parts in the system of main steam pipe which is easy to damage.

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热煨弯管的防腐一直是埋地管道防腐的薄弱环节，直接影响管道的使用寿命。

Anticorrosion of heating bend pipes is a problem all along in buried pipeline construction. It affects directly the service life of the pipeline.

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②如有垂直向上的管道，通常必须拆弯管；

For vertical upward pipe, usually need to bend down;

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