??e?????Hsz?????

Hsz ≤ Hv - F-  Hs - NPSH

Hsz ≤ 10.09 -  Hs - NPSH

??У?Hv  = 10.33m ???????????

Fv=0.24m????20?????????????

Hs=?????·?????????????????

NPSH=????????????

NPSH=NPSHr+0.3

NPSHr=????????????????????????