Slope of Instrument Impulse Line

Good day to all,

As per my research, the minimum slope of instrument impulse line is 1:12

Is there anyone here knows how to explain this, and how can we apply this in the actual scenario?


as I understand it is like this:

Download Impulse Lines Guide:
Impulse Lines.pdf (546.5 KB)

Hi Blackbass,
API 551 section 8.3.2 well answer your questions. See below snapshot:

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