鉛(qian)管(guan)因質軟且重，故經過搬運、裝卸之(zhi)后一般均(jun)產生變形，所以鉛(qian)管(guan)在安(an)裝前均(jun)應調直(zhi)和校(xiao)圓。 

  鉛管(guan)調直時，鉛管(guan)應(ying)放在(zai)鋪有木板的平臺(tai)上用木榔(lang)頭輕輕敲打(da)調直。為了便于檢査和(he)操作(zuo)，常(chang)把(ba)鉛管(guan)緊貼在(zai)角(jiao)鋼(gang)或槽鋼(gang)內(nei)側的翼上，根據管(guan)子和(he)型鋼(gang)的間隙(xi)拍打(da)調直。

  鉛(qian)(qian)管(guan)(guan)(guan)除調直(zhi)外(wai)，還(huan)需校(xiao)圓。直(zhi)徑大于DN50mm的鉛(qian)(qian)管(guan)(guan)(guan)校(xiao)圓，可(ke)用一根外(wai)徑小于鉛(qian)(qian)管(guan)(guan)(guan)內(nei)徑的鋼管(guan)(guan)(guan)（管(guan)(guan)(guan)端(duan)最好制成(cheng)一半球形封頭）穿在(zai)鉛(qian)(qian)管(guan)(guan)(guan)內(nei)，并把鋼管(guan)(guan)(guan)的兩(liang)端(duan)放在(zai)支撐架(jia)上， 然后用木錘(chui)敲打鉛(qian)(qian)管(guan)(guan)(guan)被壓扁的地方，邊打邊轉動(dong)管(guan)(guan)(guan)子，直(zhi)到將(jiang)管(guan)(guan)(guan)子校(xiao)圓為止。

  鉛管(guan)校圓的(de)方法還有用(yong)硬(ying)木制成的(de)外徑與(yu)鉛管(guan)內徑相同的(de)圓柱形胎具(ju)，將(jiang)頭部削圓， 穿上繩子(zi)，用(yong)繩將(jiang)胎具(ju)拉進管(guan)內，使變形部位隨胎具(ju)而撐(cheng)圓。

  鉛(qian)管(guan)(guan)直徑不大于DN50mm的鉛(qian)管(guan)(guan)校圓，可(ke)將(jiang)鉛(qian)管(guan)(guan)兩(liang)端(duan)堵塞，在管(guan)(guan)內(nei)通入壓(ya)(ya)力為0.3～0.4MPa的壓(ya)(ya)縮空(kong)氣，然后用焊炬(ju)對壓(ya)(ya)扁的地方加(jia)(jia)熱(re)，管(guan)(guan)內(nei)的壓(ya)(ya)縮空(kong)氣把(ba)管(guan)(guan)子脹(zhang)圓，加(jia)(jia)熱(re)時，要(yao)注意使加(jia)(jia)熱(re)部分(fen)受熱(re)均(jun)勻，升(sheng)溫不要(yao)太(tai)快，當管(guan)(guan)子被脹(zhang)圓時，應立即停止加(jia)(jia)熱(re)。