Page 262 - Water Standards
P. 262

throw shall be no larger than 0   20mm.
                  3) When the stator is installed, the composite surface of the
                     stator and foundation base shall be carefully cleaned.
                     Packing seals shall be installed in strict compliance with
                     the design requirements. The air gap between the stator
                     and rotor shall be well adjusted. The difference between
                     each gap and the average gap shall be no larger than ±8%
                     of the average gap.
           4   2   11  Installation of the pipes and accessories shall meet the fol⁃
           lowing requirements:
                1  Pipe quality after being bent shall meet the following require⁃
           ments:
                  1) There shall be no flaws such as fissures, delamination and
                     over burning.
                   2 ) The difference between the maximum and minimum
                      external diameters of the pipe should not be larger than
                      8% of the pipe diameter.
                  3) The angle of bending shall be in accordance with the
                      sample plate.
                  4) The height of corrugated folds inside of the elbow pipe
                     should not be larger than 3% of the pipe diameter. The
                     spacing of folds should not be less than 4 times the fold
                     height.
                  5) The ring pipe shall be preassembled after bending and the
                     radius deviation shall be no larger than 2% of the design
                     value. The pipes shall be on the same surface and the de⁃
                     viation no larger than 40mm.
                2  Vertical deviation of welded three⁃way pipes shall be no
           larger than 2% of the height  
                3  When the pipes are installed, the position of the weld joints
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