Page 244 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition
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21 6                      Applied Process Design for Chemical and Petrochemical Plants

























































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                                                                    L‘      U
             FULL Row                 PARTIAL FLOW            NEUTRAL OR NO FLOW      REVERSE FLOW
                                                                                                        no
                                                                                                      the
             The liner (grey area) is in lull-capacity   Now the liner has been rotated counler-   Rotating the liner slill further a point IS   When the liner IS rotated @?+I How”
             posilion with the seal point a1 the top and   clockwise which opens the seal point at   reached where displacement volumes   point the uolume above the rotor exceeds
             the pumping chamber at the bottom All   the lop This allows cart of the lwid to be   above and below the rotor are equalized   that below. and net Row reverses direction
             Iiquld coming into the pump et me lei3 is   recirculated. reducing the net flow by a   This causes as much  lauid to be returned   even though pump  speed and rotatton have
             movtng out of it a1 the rtght   propomonale amount   over the top as  is brought forward across   not changed (Limited to approx 30% of
                                                              the bottom resulting in zero flow   full forward flow on all models )
          I
                         Figure 3-65C. Sliding vane rotary pump. (By permission, Blackmer Pump, Dover Resources Co.)
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