大口徑螺旋涂塑鋼管是(shi)指(zhi)使用直徑大(da)于1米的螺旋(xuan)鋼管做為(wei)(wei)基管進行(xing)內外(wai)涂塑(su)。防腐形式一般(ban)為(wei)(wei)外(wai)聚乙烯內環氧(yang)(yang)粉末，或內外(wai)環氧(yang)(yang)粉末，該(gai)產品常用于大(da)型(xing)(xing)水利(li)工程的給排水管道(dao)。螺旋(xuan)鋼管采用鋼帶經過彎曲成(cheng)型(xing)(xing)焊(han)接制成(cheng)。成(cheng)品經水壓、彎曲、探傷等實驗合格后方可(ke)下線。

　　進(jin)行涂塑(su)涂覆時需(xu)對鋼管(guan)內(nei)外面(mian)進(jin)行檢查，是(shi)否能(neng)滿足(zu)產品(pin)生產需(xu)要，然(ran)后(hou)(hou)對鋼管(guan)進(jin)行噴(pen)砂處(chu)(chu)理在內(nei)外表面(mian)打出錨紋(wen)，使(shi)粉(fen)末(mo)固化后(hou)(hou)與鋼管(guan)能(neng)緊密結(jie)(jie)合。外涂層(ceng)采用(yong)(yong)(yong)改性(xing)(xing)聚乙烯(xi)或環(huan)氧樹脂，生產工藝采用(yong)(yong)(yong)熱浸塑(su)或噴(pen)涂的(de)方式。涂層(ceng)具(ju)有良(liang)好的(de)電(dian)氣絕緣性(xing)(xing)，確保管(guan)道(dao)深埋地下(xia)不會產生電(dian)蝕(shi)。內(nei)壁噴(pen)涂環(huan)氧粉(fen)末(mo)固化后(hou)(hou)表面(mian)光滑，用(yong)(yong)(yong)作(zuo)(zuo)飲(yin)用(yong)(yong)(yong)水輸送(song)管(guan)道(dao)使(shi)用(yong)(yong)(yong)確保水質衛生，作(zuo)(zuo)為污水處(chu)(chu)理管(guan)道(dao)使(shi)用(yong)(yong)(yong)表面(mian)不結(jie)(jie)垢增加輸送(song)流量。