Cross-shaped anti-vortex device
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I have now drawn a cross-shaped vortex-preventing device; how should its node diagram be represented?
It doesn’t really matter, right? Just weld it, or you can represent it with weld symbols.
Remove the triangle and the number 4 below the horizontal line, as well as the circle, and add 4 at the end (indicating welds identical to those outside 4). (The small circle indicates one pass of welding around the weld.)
It’s not drawn like this. A tube is used in the middle, and then the plate is welded to the tube.
The weld symbol follows the suggestions in #7 – use it if it’s appropriate, or else just indicate it directly on the diagram; anyway, you’ve already drawn the welds~ :)