Cement Bulk Transfer (Pneumatic) Calculation?

I'm doing a project wich required me to calculate the transfer rate of Barite & Cement from tanks to tanks. I've run couple of calculation but i'm not sure it is the correct one or not.

Please advise.
Update: Thanks E...
the detail is as follow;
Pipe size = 5"
eductor = 1" c/w fluffer vlv
acfm = 631 @ 7 bar

but the most tricky part is the requirement of transfer rate is =80 ton /hr
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