Kashewar famfo na Centrifugal galibi ya faru ne saboda gazawar hatimin inji. Rashin aikin mafi yawan kwararar ruwa, dalilan kwararar masu zuwa:
Tsayayye da tsayayyen zoben hatimi na saman ruwa, mahimman dalilan sune: ƙarshen jirgin saman flatness, ƙarancin ƙarfi bai cika buƙatun ba, ko ƙyallen farji ba; tsakanin karshen wani kwayar halitta, sakamakon duka karshen ba zai iya gudana iri daya ba; shigarwa baya wuri, hanyar ba daidai bane.
Rawanin hatimin zoben diyya, manyan dalilan sune: nakasar gland, preload bai zama iri daya ba; shigarwa ba daidai bane; ingancin hatimi bai cika mizani ba; zaɓin hatimi ba daidai bane
Amfani da ainihin sakamakon ya nuna cewa ɓangarorin da suka gaza gazawa na ɓangaren hatimi yana motsawa kuma zoben ƙarshe na ƙarshe, bugun sintiri na tsakiya, tsayayyen zobe na ƙwanƙwasa abu ne na rashin nasara gama gari, mahimman dalilan sune: rata ta yi yawa, Ruwan kurkura ya yi latti don ɗauke zafin da gogayyan biyu ya haifar; ruwan da yake zubowa yana zubewa daga ratar farfajiyar saman, yana haifar da ƙarshen fuska da zafi da lalacewa.
Expansion fadada watsa labaru na ruwa, ta yadda duka biyun sun ƙare ta hanyar turɓayawar ƙarfin faɗaɗawa kuma sun rabu, lokacin da farfajiyar rufewar biyu ta tilasta dacewa, ta lalata fim ɗin lubricating kuma ta haka ne zai haifar da saman saman zafi.
L lubrication na kafofin watsa labarai marasa ruwa, haɗe tare da yawan aiki mai nauyi, jujjuyawar bin sawu biyu ba a aiki ba. Misali, saurin famfo mai sauri shine 20445r / min, maɓallin tsakiya na sealing shine 7cm, saurin famfo bayan layin yayi sauri har zuwa 75m / s, lokacin da akwai shinge na sararin samaniya ba zai iya bin hanyar juyawa ba, saurin zafin jiki da ya haifar ta hanyar rufe lalacewar farfajiya.