清管和测径用的清管器直径通常比管道内径要过盈5%至8%。

Pigging and caliper with clear pig diameter than pipe diameter usually to interference by 5% to 8%.

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测径板的直径取决于所测管段的内径，并需考虑到该管段的变径设计，一般为所测管段最小理论内径的95%。

Caliper board depends on the diameter of pipe diameter, and the need to consider the design of pipe diameter changes, general for the minimum 95% of the pipe inner diameter theory.

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TDB作为管状发热器，有着更大的直径，更薄的管壁和更清晰的内径。

With a larger diameter, thinner wall, and clear inner diameter (ID) the TDB are used as tube heaters.

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