Is there a concept of average diameter for corrugated furnace?
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In the calculation of GB/T16508.3, the average diameter Dm seems to only appear in the straight furnace, and the corrugated furnace only involves the outer diameter D0. Is there a concept of average diameter in the corrugated furnace? When the conical section and corrugation are combined in a horizontal shell boiler, the average inner diameter of the conical section is less than or equal to the inner diameter of the corrugated furnace, which is inconsistent. So, can Dm be substituted into the average diameter of the straight section of the corrugated furnace in the formula for the moment of inertia of the combined straight and corrugated furnace?
The average diameter of the corrugated furnace is the average diameter of the straight part of the corrugated furnace. According to the standard
This post was last edited by qqsbig001 on 2018-11-11 12:30 When the combination of a tapered section and a corrugated section (that is, a combination of a straight and corrugated furnace), does Dm substitute the average diameter of the tapered section or the average diameter of the straight part of the corrugated section?
I know this. I just don’t know which one should be used when the average diameters of the straight part and the corrugated part are inconsistent in the combination of straight and corrugated furnaces?
Oh, the straight part includes the tapered section and the straight section of the corrugated furnace, so in equation (56), Dm is still correct to take "half the sum of the large inner diameter and the small inner diameter plus the wall thickness", right?
The upper line of the 56 formula clearly states that it is the average diameter of the nearest straight section of the corrugated tube.； DM of course refers to the average diameter of the straight section ；
The reason why I say the above is because in the limited examples I have seen, the average inner diameter of the tapered section is added to the wall thickness. Originally, I personally thought that taking the average diameter of the straight section of the corrugated furnace was more conservative. The straight part mentioned above in Equation 56 can be seen in conjunction with Figure 16. The straight part should not just refer to the straight part of the corrugated furnace. If the example question is wrong, I won't be so entangled.