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152 Improving Machinery Reliability
8 18
17
X
16
15
2 14
6 13
2 12
v)
z 1'
10
0
39
v) l I I I I I I I I I I I I 1 I I I l I
8 l ' ! ' ! f ! ' ! ' ! ' ! ' ! 1 '
0 10 20 30 40 50 60 70 80
PERCENT OF BEST EFFICIENCY POINT CAPACITY
AT MAXIMUM DIAMETER IMPELLER
Figure 3-43. Minimum continuous stable flow versus suction specific speed of centrifu-
gal pumps for general refinery services. (Courtesy C. C. Heald and R. Palgrave, Form
70941, Ingersoll-Rand Company, 1985.)
4.0
3.5
:TOR
3.0
NPSHn
NPSHR* 2.5
2.0
1.5
1 .o
0.6 0.7 0.8 0.9 1 .o
* AT BEP KM
Figure 3-44. Minimum flow correction factor for NPSHA margin. (Courtesy C. C. Heald
and R. Palgrave, Form 70941, Ingersoll-Rand, 1985.)
