What type of flange is this, and which standard does it comply with?
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As shown in the figure, this is the fan inlet flange; I couldn’t find out what flange standard is commonly used for it
It’s a custom-designed flange that doesn’t fit any standard specifications. Just think: its outer diameter is only 676, the center distance is 650, and its width at the edges is 13 mm. After cutting away half of the bolt hole, the remaining width is 8 mm, while the diameter is 600. It’s truly a custom-designed flange; it’s not designed to withstand any pressure, but rather for connection purposes only
Non-standard flanges, designed by myself.
The outer diameter is 680, there are 12 bolt holes with a diameter of 620 each, and the pipe diameter is 560. Is this type of flange a custom-made one or what kind of flange is it?
It has the same outer diameter as the Type A flat welding flange DN550 specified in NB/T47021, but its other dimensions are different; it does not match the specifications in standards such as GB, HG, JB, ASME, and DIN, as these standards do not include DN550
Can the flanges that come with this type of equipment be purchased externally? Should I do it myself?
The equipment flange is certainly fine; I’ll take care of it right away
The inlet flange of a centrifugal fan is actually a thin sheet of iron in the form of a concentric ring. Just enter any fan model in Baidu Images (for example, 9-19) and you’ll find out.