Page 237 - Water Standards
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sealing surfaces shall be no larger than 0   08mm.
                 5) The end clearance between the guide vane seals and front and back cover plates
                   shall be no larger than 0   25mm.
               3  The checking and scraping of the bearing liner shall meet the requirements of Article
           4   2   9 in this specification  
               4    The fitting between the bearing liner and the bearing shell shall meet the
           requirements of Article 4   2   9 in this specification  
               5  The bearing liner gap shall meet design requirements and shall be closely sealed up.
           The oil shall be able to recycle smoothly.
           4   2   5  Installation of shaft⁃extension tubular turbines shall meet the following requirements:
               1  For parts which need to be preassembled on site, when being hoisted up and turned
           over by 90°, measures shall be taken to prevent deformation and overturning. The embedded
           parts shall be reinforced after the installation and adjustment. The concrete shall be poured
           layer by layer and the rising speed shall be controlled to prevent the deformation of the parts  
               2  Fitted components shall be preassembled and the fit size shall be checked before be
           hoisted. Any deviation which exceeds the allowable error shall be corrected before installa⁃
           tion  
               3  The draft tube allowable installation error shall meet the requirements of Table 4   2   5
           -1  
                   Table 4   2   5-1  Draft tube  s allowable installation error

             No          Item          Allowable error   Explanation

                   The difference between the
                                                      For structures with base
                 maximum and minimum diam⁃
             1                            3   0mm   ring, it means the base
                 eters  of  the  pipe  orifice
                                                    ring upper flange
                 flanges
                                                      Measure the elevation of
                                                    the pipe orifice  s horizontal
             2     Center and elevation  ±1   5mm   marks and the horizontal
                                                    deviation  of  the
                                                    vertical marks
                                                      (1) If the stay ring is
                                                    installed first, its flange
                    Distance  between  pipe
                                                    surface shall be taken as
             3   orifice flange to the runner  ±2   0mm
                                                    the datum plane;
                 center line
                                                      (2) Measure the upper,
                                                    lower, left and right points

             2 3 0
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