Thaum ntxuav lub tshuab luam ntawv flexo, hom kev ntxuav cov kua dej uas yuav tsum tau xaiv yuav tsum xav txog ob yam: ib qho yog tias nws yuav tsum phim hom number case siv;Lwm qhov yog tias nws tsis tuaj yeem ua rau o lossis corrosion rau lub phaj luam ntawv.Ua ntej luam ntawv, lub phaj luam ntawv yuav tsum tau muab ntxuav nrog cov tshuaj ntxuav kom huv si kom paub meej tias qhov chaw ntawm lub phaj luam ntawv yog huv si thiab tsis muaj av.Tom qab kaw, lub phaj luam ntawv yuav tsum tau muab ntxuav tam sim ntawd txhawm rau tiv thaiv cov ntawv luam tawm los ntawm kev ziab thiab ua kom khov rau saum npoo ntawm lub phaj luam ntawv.