Page 243 - Water Standards
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radial deviation shall be no larger than ±2% d 1 (d 1 is the runner pitch diame⁃
                    ter). The axial deviation compared with the bucket water dividing edge shall be
                    no larger than ±0   5% W (W is the bucket maximum inner width).
                   —The deviation between the deflector center and nozzle center shall be no larger
                    than 4mm.
                   —The deviation between the buffer spring compression length and the design value
                    shall be no larger than ±1mm.
                   —The synchronous deviation of each jet nozzle through the stroke shall be no
                    larger than 2% of the design stroke.
                   —The axial and radial deviations of the reversed braking nozzle  s center line shall
                    be no larger than ±5mm  
               6  Runner installation shall meet the following requirements:
                 1) The rotating surface of the runner bucket  s water dividing edge shall pass through
                   the nozzle flange  s center on the casing and the deviation shall be no larger than ±
                   0   5%W.
                 2) The amount of bouncing of the runner end face shall be no larger than 0   05mm/ m.
                 3) The gap between the runner and water flap shall meet the design requirements.
               7  Main shaft sealing shall meet the requirements of Article 4   2   3 in this specification  
               8  Control mechanism installation and adjustment shall meet the following requirements:
                 1) The center deviation of each component of the control mechanism shall be no
                   larger than 2mm and the elevation deviation shall be no larger than ± 1   5mm.
                   Horizontal or vertical deviation shall be no larger than 0   10mm/ m. The mecha⁃
                   nism shall move freely after the installation.
                 2) The deflector opening shall be 3mm larger than the radius of the jet during this o⁃
                   pening stroke but shall be no larger than 6mm. Each deflector shall move synchro⁃
                   nously and the deviation shall be no larger than 2% of the design value  
           4   2   7  Installation of the speed governing system shall meet the following requirements:
               1  The allowable error of the oil pressure device installation shall meet the requirements
           of Table 4   2   7-1  
                  Table 4   2   7-1  Allowable installation error of the return
                        oil tank (governor tank) and pressure tank
             No        Item          Allowable error     Explanation
                                                      Measure the distance be⁃
                                                    tween  the  marks  on
             1     Center          No larger than 5   0mm  equipment and the turbine⁃
                                                    generator X and Y datum
                                                    lines
             2     Elevation       ±5mm                     —

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