Thaum nws los mus yuav lub twj tso kua mis, ib qho tseem ceeb uas koj yuav tsum xav txog yog Net Positive Suction Head (NPSH). NPSH yog lub siab xav tau ntawm qhov nqus ntawm lub twj tso kua mis los tiv thaiv cavitation. Cavitation yog ib qho tshwm sim uas lub siab ntawm qhov nqus ntawm lub twj tso kua mis poob, ua rau cov kua boil thiab ua npuas. Cov npuas no tuaj yeem tawg, ua rau cov khoom siv twj tso kua mis puas thiab txo nws cov kev ua haujlwm.
Xav txog NPSH yog qhov tseem ceeb vim nws ua kom lub twj tso kua mis khiav ntawm nws qhov zoo tshaj plaws, tsis muaj kev puas tsuaj lossis tsis ua haujlwm. Yog tias koj xaiv lub twj tso kua mis nrog NPSH qis, nws yuav ua rau cov cavitation thiab lwm yam kev puas tsuaj uas yuav cuam tshuam rau nws qhov kev ua tau zoo. Qhov no tuaj yeem ua rau qhov xav tau kev kho ntau zaus lossis hloov pauv, ua rau cov nqi ntxiv thiab sijhawm poob.
Los ntawm kev xav txog NPSH thaum yuav lub twj tso kua mis, koj xyuas kom tsis yog lub twj tso kua mis ua haujlwm nkaus xwb tab sis kuj tseem muaj kev ntseeg siab thiab siv tau ntev. Nws tseem yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias cov twj sib txawv muaj cov NPSH sib txawv, yog li koj yuav tsum xaiv lub twj tso kua mis uas haum rau koj daim ntawv thov tshwj xeeb.
Hauv kev xaus, NPSH yog qhov tseem ceeb uas yuav tsum tau xav txog thaum yuav lub twj tso kua mis, kom ntseeg tau tias qhov kev ua tau zoo, kev ntseeg tau, thiab kev ua haujlwm ntev ntev. Yog li, nco ntsoov ua koj cov kev tshawb fawb thiab xaiv lub twj tso kua mis uas ua tau raws li koj qhov tshwj xeeb NPSH cov cai.