Requirements for the heat exchange tubes in the first-stage tube bundle of the heat exchanger
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GB/T151 specifies the outer diameter of the heat exchange tubes for Class I tube bundles. Are there any requirements regarding inspections? For example, how many samples should be taken from a batch, and how many inspection points per tube?
These detailed requirements should be specified in the corresponding pipe standards, right?
No, I couldn’t find it in GB9948
The deviations in grade I and grade II tube bundles are mainly related not to the tubes themselves, but to the diameter of the corresponding tube holes. You can take a look at page 23 of 151.
The 4th floor is the correct answer; high-precision tubes are used for the heat exchange tubes.
I know that for I and II, there are requirements regarding deviations in the tube holes and the outer diameter of the heat exchange tubes. What I’m asking is whether there are specific requirements for testing the heat exchange tubes
High-precision tubes are used for the heat exchange tubes, and no requirements for inspecting these tubes exist