It used to be three thousand cubic metres per hour per metre of belt width. ■

I have attached data from Cement Engineer's handbook (Otto Labahn) 1983 edition. I have used data for meeting new norms in old installations in Limestone, iron ore and plants like cement and iron ore pellet plants

Attachments

dust & flow rates (JPG)

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One guide I have gives

0.5 m3/sec per metre width of belt for speeds < 1m/s

0.7 m3/sec per metre width of belt for speeds > 1m/s

for general materials, double this for dry very dusty materials

Also all opens should have an indraft of 0.75 - 1 m/s ■