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When varying speed the following equations hold good in accordance with the law of similarity:
Q[sub]1[/sub]/Q[sub]2[/sub] = n[sub]1[/sub]/n[sub]2[/sub]
H[sub]1[/sub]/H[sub]2[/sub] = (n[sub]1[/sub]/n[sub]2[/sub])[sup]2[/sup]
NPSH[sub]1[/sub]/NPSH[sub]2[/sub] = (n[sub]1[/sub]/n[sub]2[/sub])[sup]2[/sup]
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With small speed changes (up to 10%) efficiency remains virtually unchanged. With bigger speed changes the velocity in the channels alters and with it the Reynolds number. The efficiency factor must be downgraded at lower speeds and upgraded at higher ones.