Page 238 - Water Standards
P. 238
Table 4 2 5-1 (Continue)
No Item Allowable error Explanation
4 Verticality of flange surfaces 0 4mm/ m —
Inner wall perimeters of two
5 ≤10mm —
adjacent pipe orifices
Concentricity of each D is the design inner di⁃
6 0 002D
segment unit ameter of the pipe
4 The stay ring (tubular shell) allowable installation error shall
meet the requirements of Table 4 2 5-2
5 The allowable installation error of the bearing shall meet the
requirements of Table 4 2 5-3
Table 4 2 5-2 Stay ring (tubular shell) allowable
installation error
No Item Allowable error Explanation
(1) Measure the elevation of
upstream and downstream
flanges horizontal marks;
1 Center and position ±2 0mm ( 2 ) Measure the distance
between X and Y marks on the
component and corresponding
datum lines
( 1 ) If the draft tubes or
foundation ring are installed
Distance between the
first, their flange surfaces shall
2 flange to the runner ±2 0mm
be taken as the datum planes;
center line
( 2 ) Measure the upper,
lower, left and right points
Verticality of pre⁃
3 0 8mm/ m —
centrum flanges
2 3 1