An axial section of the suction nozzle A for a bulk wheat unloader is shown here. The outer pipe is secured to the inner pipe by several longitudinal webs which do not restrict the flow of air. A vacuum of 9 in. of mercury (p = −4.42 lb/in.² gage) is maintained in the inner pipe, and the pressure across the bottom of the outer pipe is atmospheric (p = 0). Air at 0.075 lb/ft³ is drawn in through the space between the pipes at a rate of 18 tons/hr at atmospheric pressure and draws with it 150 tons of wheat per hour up the pipe at a velocity of 124 ft/sec. If the nozzle unit below section A-A weighs 60 lb, calculate the compression C in the connection at A-A.

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15" 14"- A Air Air 16.5"-