管(guan)(guan)(guan)道的(de)(de)(de)(de)(de)施工(gong)技術和施工(gong)質量也提出了(le)越來越高的(de)(de)(de)(de)(de)要(yao)(yao)求(qiu),對(dui)于(yu)埋地(di)鋼管(guan)(guan)(guan)的(de)(de)(de)(de)(de)外防(fang)腐(fu)方(fang)面(mian),目前我們(men)已淘(tao)汰了(le)石(shi)油瀝青(qing)外防(fang)腐(fu),統一(yi)采(cai)(cai)用(yong)(yong)(yong)環(huan)氧煤(mei)瀝青(qing)防(fang)腐(fu)鋼管(guan)(guan)(guan)。采(cai)(cai)用(yong)(yong)(yong)環(huan)氧煤(mei)瀝青(qing)防(fang)腐(fu)鋼管(guan)(guan)(guan)的(de)(de)(de)(de)(de)優點(dian)是: 1.兼(jian)具煤(mei)焦瀝青(qing)耐(nai)水性(xing)好、防(fang)銹(xiu)(xiu)性(xing)能(neng)優良、耐(nai)侵蝕的(de)(de)(de)(de)(de)優點(dian),又具環(huan)氧樹脂漆(qi)膜堅(jian)韌(ren)、附著(zhu)力好、機械強度高的(de)(de)(de)(de)(de)特(te)點(dian)。sunyujing 2.成(cheng)膜涂層的(de)(de)(de)(de)(de)耐(nai)化(hua)(hua)學介質、電(dian)絕緣性(xing)能(neng)、耐(nai)生物(wu)侵蝕、耐(nai)海水性(xing)能(neng)等都較穩定。特(te)別鋼管(guan)(guan)(guan)的(de)(de)(de)(de)(de)使用(yong)(yong)(yong)壽命,應嚴格(ge)按照以下要(yao)(yao)求(qiu)施工(gong): 一(yi)、施工(gong)技米要(yao)(yao)求(qiu) 1.鋼管(guan)(guan)(guan)表面(mian)處(chu)理。一(yi)般(ban)鋼管(guan)(guan)(guan)表面(mian)都有氧化(hua)(hua)皮、銹(xiu)(xiu)蝕、油污、灰塵(chen)等,若不(bu)經(jing)處(chu)理,會直接影響涂層的(de)(de)(de)(de)(de)附著(zhu)力,為了(le)保(bao)證防(fang)腐(fu)層的(de)(de)(de)(de)(de)使用(yong)(yong)(yong)壽命,鋼質表面(mian)處(chu)理需(xu)采(cai)(cai)用(yong)(yong)(yong)噴砂除(chu)銹(xiu)(xiu),使基(ji)本面(mian)能(neng)達到(dao)SaZ(l/2)級(用(yong)(yong)(yong)肉眼看(kan)表面(mian)有明顯(xian)的(de)(de)(de)(de)(de)毛紋),除(chu)完銹(xiu)(xiu)應在(zai)6h內涂刷(shua)底(di)(di)漆(qi)。 2.涂底(di)(di)漆(qi)。涂底(di)(di)漆(qi)可采(cai)(cai)用(yong)(yong)(yong)滾(gun)刷(shua)或漆(qi)刷(shua),涂刷(shua)底(di)(di)漆(qi)要(yao)(yao)求(qiu)盡量薄涂,一(yi)般(ban)為30拜(bai)m一(yi)5如m,應注意漆(qi)膜均勻不(bu)得漏涂。

螺旋(xuan)焊(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)生產廠(chang)家(jia)焊(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)工藝：從焊(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)工藝而(er)言，螺旋(xuan)焊(han)(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)與直縫(feng)(feng)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)焊(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)方法(fa)一致，但(dan)直縫(feng)(feng)焊(han)(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)不可(ke)避免地會(hui)有(you)很(hen)(hen)多(duo)的(de)丁(ding)字焊(han)(han)(han)(han)(han)縫(feng)(feng)，因此存在焊(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)缺陷的(de)機率也大大提高(gao)，而(er)且丁(ding)字焊(han)(han)(han)(han)(han)縫(feng)(feng)處(chu)的(de)焊(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)殘余(yu)應(ying)力(li)較大，焊(han)(han)(han)(han)(han)縫(feng)(feng)金屬(shu)往(wang)往(wang)處(chu)于三向(xiang)應(ying)力(li)狀態(tai)，增加了產生裂紋的(de)可(ke)能性。而(er)且，根據(ju)埋(mai)弧(hu)焊(han)(han)(han)(han)(han)的(de)工藝規定(ding)，每條焊(han)(han)(han)(han)(han)縫(feng)(feng)均應(ying)有(you)引(yin)弧(hu)處(chu)和熄弧(hu)處(chu)，但(dan)每根直縫(feng)(feng)焊(han)(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)在焊(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)環(huan)縫(feng)(feng)時，無法(fa)達到該條件，由(you)此在熄弧(hu)處(chu)可(ke)能有(you)較多(duo)的(de)焊(han)(han)(han)(han)(han)接(jie)(jie)(jie)(jie)缺陷。電阻焊(han)(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)（高(gao)頻(pin)，低頻(pin)），氣焊(han)(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，爐焊(han)(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。sunyujing（2）按焊(han)(han)(han)(han)(han)縫(feng)(feng)分——直縫(feng)(feng)焊(han)(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，螺旋(xuan)焊(han)(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。按斷(duan)面(mian)形(xing)(xing)狀分類(lei)（1）簡單斷(duan)面(mian)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)——圓(yuan)形(xing)(xing)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。方形(xing)(xing)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，橢圓(yuan)形(xing)(xing)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，三角形(xing)(xing)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，六(liu)角形(xing)(xing)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，菱形(xing)(xing)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，八(ba)角形(xing)(xing)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，半圓(yuan)形(xing)(xing)鋼(gang)(gang)(gang)(gang)(gang)圓(yuan)，其(qi)他(ta)。（2）復雜斷(duan)面(mian)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)——不等邊六(liu)角形(xing)(xing)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，五瓣(ban)梅花形(xing)(xing)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，雙凸(tu)形(xing)(xing)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，雙凹(ao)形(xing)(xing)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，瓜(gua)子形(xing)(xing)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，圓(yuan)錐(zhui)形(xing)(xing)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，波(bo)紋形(xing)(xing)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，表殼鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，其(qi)他(ta)。按壁(bi)厚分類(lei)薄(bo)壁(bi)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，厚壁(bi)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。錯邊時有(you)發生，其(qi)影(ying)響因素很(hen)(hen)多(duo)。在生產實踐(jian)中，往(wang)往(wang)由(you)干錯邊超(chao)差而(er)使鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)降(jiang)級。