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Table 4

1 January 2000

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Table 4 *X <= indicates hydraulically smooth flow, when X can be taken as 1 and drop in efficiency computed. Results thus obtained and given in the last column shows insignificant change.

Sl.No.	Surface roughness Ra of various components (microns)		Drop in hhP %
	Spiral casing	Guide vane	Runner	Draft tube	Disc friction	X as computed	*X=1 if X 1
1	0.9	0.4	0.4	0.9	0.4	No drop	No drop
2	0.9	0.8	0.8	0.9	0.8	0.04946	0.0700
3	0.9	1.6	1.6	0.9	1.6	0.1819	0.1956
4	0.9	3.2	3.2	0.9	3.2	0.3786	0.3923
5	0.9	6.4	6.4	0.9	6.4	0.6454	0.6591

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