Page 231 - Water Standards
P. 231
Table 4 2 3-3 (Continue)
No Item Allowable error Explanation
Measure from the upper
Center and elevation of the
6 ±1 0mm flange surface of the
servomotor foundation
stay ring
Parallel between the
servomotor foundation and the
7 1 0mm —
turbine⁃generator coordinate
datum line
Distance from the servomotor
Deviation from the
8 foundation to turbine⁃generator ±3mm
design value
datum line
2 Runner assembly shall meet the following requirements:
1 ) The runner shall have no fissures. If necessary, it shall be checked by
ultrasound. The blade profile shall meet the design requirements.
2) When connected together, there shall be no gap between the main shaft and the
runner. The axiality and circularity of each part of the runner shall be checked
taking the main shaft as the center. The difference between each radius and the
average radius shall meet the requirements of Table 4 2 3-4
Table 4 2 3-4 Allowable error in axiality and circularity
of the runner parts
Working
Part Allowable error Explanation
water head
Sealing ring ±10% of design gap —
Blade outer edge ±10% of design gap —
Diversion plate sealing ring ±15% of design gap —
<200m
Flange shelter concurrently
±15% of design gap —
used as maintenance seal
2 2 4