Page 230 - Water Standards
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Table 4 2 3-2 (Continue)
No Item Allowable error Explanation
For the axial⁃flow turbine,
Difference between
measure the upper, middle and
each radius and average
Circularity of the lower sections; for the diagonal
4 radius shall be no larger
runner chamber flow turbine, measure the upper
than ±10% of the design
and lower spigots 8 equidistant
average gap
points at least
Measure 8 equidistant points at
least. For mixed⁃flow turbine, the
Circularity of measurement is based on the center
5 the base ring 1 0mm of the lower fixed sealing ring; for
and stay ring axial⁃flow turbine, the
measurement is based on the center
of the runner chamber
Table 4 2 3-3 Allowable installation error of turbine pit liner
and servomotor foundation
No Item Allowable error Explanation
Measure the distance be⁃
tween the liner flange and
1 Center of turbine pit liner 5mm the bore opening of the stay
ring upper flange at 8 equi⁃
distant points
The upper opening diameter of Measure at 8
2 ±5mm
the turbine pit liner equidistant points
Elevation of the turbine pit Measure at 8
3 ±3mm
liner upper opening equidistant points
Levelness of the turbine pit Measure at 8
4 6
liner upper opening equidistant points
Verticality of the servomotor
5 0 30mm/ m —
foundation flanges
2 2 3