Are there any requirements regarding the cylindricity of the tube sheet holes in the tube sheet expansion jointing process?

2017-05-20View Original

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We are currently manufacturing tube sheets for marine intercoolers. It can be considered a secondary supplier. The customer’s requirement is that there should be no leaks during pressure testing; however, there is slight leakage during testing at the first-level supplier (one drop of water per 5 minutes). The likely cause identified so far is that the cylindricity of the tube sheet is out of spec (in other words, as a secondary supplier, the cylindricity of the holes in the tube sheet we produce results in 1 to 10 holes out of 160 having a cylindricity error within the range of 0.04–0.07). The only standard found is the national standard jbt9619-1999 for industrial boilers. Do the companies represented here in the forum have any standard codes for the acceptance of tube sheets, and where do these codes come from?

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Are there any requirements regarding the cylindricity of the tube sheet holes in the tube sheet expansion jointing process?

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