Page 234 - Water Standards
P. 234
requirements:
1) The bearing liner shall meet the following requirements:
Table 4 2 3-6 Allowable error of elevation and
gap of runner installation Unit: mm
No Item Allowable error Explanation
The uneven misalign⁃
Mixed⁃flow type ±1 5 ment between the fixed
and rotating sealing rings
The distance from the
1 Elevation
Axial⁃flow type 0-+2 0 bottom ring to runner
top surface
The gap between the
Diagonal flow
0-+0 8 vane and the runner
type
chamber
The difference be⁃
The gap between the
tween each gap and
vane and runner chamber
Working head actual average gap
at the inlet, outlet and
<200m shall be no larger than
the middle when the run⁃
± 20% of the
ner is totally closed
average gap
The difference be⁃
tween each gap and
a 1 actual average gap
2 Gap
shall be no larger than
a 2
± 10% of the
design gap
Working head
≥200m
The difference be⁃
tween each gap and
the actual average gap
b 1
shall be no larger than
b 2
± 10% of the design
average gap
—The rubber bearing liner surface shall be smooth and have no flaws such as fis⁃
2 2 7