复杂的管道可采用建立背压的方法进行清管、测径。

Complex pipe can be established by the method of back pressure pigging, caliper.

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清管和测径的施工过程完全相同。

Pigging and caliper the construction process of the same.

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传输管底端之光线感测器详图。

Detail view of light sensors at bottom of transfer line.

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传输管底端之光线感测器详图。

Detail view of light sensors at bottom of transfer line.

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