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ISO 15138 standard for flanges

thread182-388452

ISO 15138 standard for flanges

ISO 15138 standard for flanges

(OP)
If i have a circular ducting that is D160mm, I would need to have 4 Dia12 holes.

But, what would the position be? 3, 6, 9, 12 o'clock or 45 degrees angle like 1.30, 4.30, 7.30, 10.30 o'clock position?

Thanks.

RE: ISO 15138 standard for flanges

yes, you should straddle centerlines, so 45deg,135deg, 225deg and 315deg.
In piping we don't use the clockhandsystem.

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