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of treatment; finally, it shall be approved by the competent department  
                     4   2  The Installation of Hydroelectric
                                Generating Units

           4   2   1  These installation requirements are applicable within the following range:
               1    This section is applicable to the installation and acceptance of hydroelectric
           generating units under the following conditions:
                 1) The unit capacity is less than 15MW.
                 2) For Pelton turbines, the nominal runner diameter is less than 1   5m.
                 3) For Francis turbines, the nominal runner diameter is less than 2   0m.
                 4) For axial⁃flow, diagonal and tubular turbines, the nominal runner diameters are
                   less than 3   0m.
                 5) If one of the above indices of the hydroelectric generating unit is equal to or ex⁃
                   ceeds the corresponding limit, the requirements of GB / T 8564 shall be enforced.
               2  For hydroelectric generating units and their main auxiliary equipment, which are
           transported to the construction site by the equipment manufacturer in a complete unit, such as
           the spiral case, bearing, hydraulic turbine, generator, governor, main valve, etc   , the
           installation and acceptance of the equipment shall be carried out according to the requirements
           of this specification  
               3  The assembly of hydroelectric generating units and main auxiliary equipment at the
           power station shall be carried out according to the installation drawings approved by the manu⁃
           facturer, the requirements of corresponding technical documents and this specification. For
           all conditions not mentioned in this specification and the manufacturer  s technical documents,
           supplementary requirements shall be drafted by the project owner jointly with the manufacturer
           and other related organisations, and shall be reported to the department in charge for the re⁃
           cord.
           4   2   2  Installation of hydroelectric generating units shall meet the following requirements:
               1  Hydroelectric generating unit equipment shall meet the requirements of the current
           relevant national technical standards (this specification included) and the contract order for
           the goods, and shall possess ex⁃factory inspection records and qualification documents. After
           the equipment has been transported to the receiving site, the acceptor shall organize relevant
           people for unpacking, tally, and inspection of the supply list and packing list before the
           deadline agreed with the manufacturer, according to JB / T 8660  
               2  All the material employed in the installation of hydroelectric generating units shall
           meet the design requirements. The main materials of the key parts shall possess inspection or
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