[Discussion Post 36] “When there is a gap in the upper part of the skirt as shown in Figure 4, there is no need to open an exhaust hole.”
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bg4.png [Discussion Post 36] "When there is a gap as shown in Figure 4 on the upper part of the skirt, there is no need to open a vent hole." If there is only one gap, is there no need to open a vent hole? Assuming that the above is true, is it possible to artificially leave a gap like the one mentioned above to replace the ventilation hole on the skirt?
This post was last edited by myhao1 on 2019-4-13 17:34 for personal understanding: If it is a spliced head, there should be more than one gap. . . At least half in half or with multiple gaps. . . If the head is pressed and formed at one time, it is unnecessary to leave such a gap artificially. It is most reliable to maintain a continuous stress state throughout the entire circle of the weld. The gap left before was actually to avoid the staggered stress of the weld (I don’t know if the expression here is appropriate. . . ) I have little talent and little knowledge. When I see this, I take the liberty to express my thoughts and learn more from the experts. * !
Assuming that there are two notches for DN1400 and above, and the corresponding four exhaust holes in the table, do they have the same effect? To put it bluntly, as long as there is a gap, there is no need to leave a gap. Is this true? :handshake
There is no need to set up the gap. I understand that the equivalent effect of the circulation area here is a vague concept, as long as it is ventilated. . . .
My understanding is that the vent hole at the gap can be omitted. The vent hole will not increase the cost much, right?
This is how I understand it: If there are seams on the head, there must be a gap. If there is a gap, no additional vents will be opened.
Can it be understood as: As long as there are enough gaps (comparable to the number of holes that should be made), vent holes are not required.
I thought so at first, but the standard didn't specify a comparison of the number of notches and holes. Probably default. Wait until you find relevant information and reply again to learn from each other. * :handshake
No need to worry. If there is a weld on the head, a notch is provided. As for the exhaust holes, you can ignore whether to set a gap and just open the holes according to the regulations.
There is nothing wrong with it once you open it, at most it just adds some negligible craftsmanship.
Uh-huh. It doesn't take much to make a hole. Could it be that you have a transition section (such as stainless steel), and the position of the exhaust pipe happens to be in the range of 400-600 in length of the transition section, and lengthening the transition section will increase the cost? So I was wondering if the exhaust hole could be omitted and the transition section could be shortened? It's probably not the situation I'm talking about.