An axial section of the suction nozzle A for a bulk wheat unloader is shown here. The ou...

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.