Requirements for signal holes in reinforcement plates
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The design specifications for 50341 vertical cylindrical welded steel oil tanks contain the following requirements (indicated by boxes); what does it mean to be on the horizontal centerline?
I hadn’t noticed that! Those who understand, please share!
Let’s talk about the function of signal holes
The signal hole can serve as a warning in case of leaks at the welds during use, so it must not be blocked while in use. Under this understanding, the signal hole should be placed at the lowest position, which would be on the lower side of the vertical center line.
I feel your understanding is incorrect; this is the position indicated in the standards
The signal hole for the reinforcement ring of pressure vessels must be located at the lowest point of the shell. It’s the first time I’ve heard that large storage tanks are required to be placed on the side. In my opinion, the inlet and outlet pipelines of such tanks are located at relatively low levels; placing them on the side is likely to facilitate observation.
It’s indeed a bit confusing to see two different standards, but large storage tanks also have many high-positioned interfaces at the top (for example, the overflow ports are definitely located at a high height). Puzzling
It is still better to place it below the reinforcement ring, so that in the event of a leak, it can be detected and addressed immediately.
I don’t know what the intention behind this request is?
This requirement is unconventional; if there is a leak, by the time it is detected through the leakage hole, some time has already passed since the leak started, which undermines its role as a signal hole. I hope to hear a reasonable explanation.