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防腐管道制作工藝的特點

作者: 來源: 日期:2024-01-29 09:06:39

我(wo)國(guo)供熱工程技術(shu)人(ren)員通過消化、吸(xi)收這項先進技術(shu),正推動(dong)著(zhu)國(guo)內(nei)管網敷設技術(shu)向更高的(de)(de)(de)層(ceng)次(ci)發展。十幾年來的(de)(de)(de)實踐成(cheng)果充分(fen)證(zheng)明了聚(ju)(ju)氨酪保(bao)溫(wen)直(zhi)(zhi)埋(mai)管敷設方式與傳(chuan)統(tong)的(de)(de)(de)地溝及(ji)架空敷設相(xiang)比(bi),具有諸多優點(dian)。直(zhi)(zhi)埋(mai)式保(bao)溫(wen)管是由(you)輸送介(jie)質的(de)(de)(de)鋼管,高密度聚(ju)(ju)乙(yi)烯(xi)外套管,以及(ji)鋼管和外套管之間的(de)(de)(de)硬質聚(ju)(ju)氨酯(zhi)泡沫保(bao)溫(wen)層(ceng)緊(jin)密結(jie)合而成(cheng)。

直埋(mai)保(bao)溫(wen)(wen)管(guan)道(dao)(dao)具有高(gao)效保(bao)溫(wen)(wen)、防(fang)水、防(fang)腐(fu)、絕(jue)熱、隔音(yin)、阻(zu)燃、耐(nai)寒、防(fang)腐(fu)、容量輕、強(qiang)度高(gao)、施工(gong)(gong)(gong)(gong)簡便快捷、不怕植物根刺等優(you)異特點,已(yi)成為建筑、運輸(shu)、石油、化工(gong)(gong)(gong)(gong)、電力、冷藏等工(gong)(gong)(gong)(gong)業部門絕(jue)熱保(bao)溫(wen)(wen)、防(fang)水堵(du)漏、密封等不可缺少的(de)材料(liao)。直埋(mai)保(bao)溫(wen)(wen)管(guan)用(yong)于室內(nei)外各種管(guan)道(dao)(dao),集中(zhong)(zhong)(zhong)供(gong)熱管(guan)道(dao)(dao),中(zhong)(zhong)(zhong)央(yang)空調管(guan)道(dao)(dao)、化工(gong)(gong)(gong)(gong)、等工(gong)(gong)(gong)(gong)業管(guan)道(dao)(dao)的(de)保(bao)溫(wen)(wen)、保(bao)冷工(gong)(gong)(gong)(gong)程(cheng)、輸(shu)油管(guan)道(dao)(dao)工(gong)(gong)(gong)(gong)程(cheng)、輸(shu)汽等管(guan)道(dao)(dao)工(gong)(gong)(gong)(gong)程(cheng)。直埋(mai)保(bao)溫(wen)(wen)管(guan)道(dao)(dao)能(neng)在(zai)0.6-1.2米(mi)凍土層內(nei)直埋(mai)熱損失比(bi)(bi)普(pu)通的(de)管(guan)道(dao)(dao)可降低40%以上,工(gong)(gong)(gong)(gong)作使(shi)用(yong)壽命(ming)(ming)比(bi)(bi)其(qi)它絕(jue)熱防(fang)腐(fu)材料(liao)提高(gao)3-5倍以上,壽命(ming)(ming)可以達到30-50年。 首先來說,中(zhong)(zhong)(zhong)小型的(de)螺旋鋼管(guan)要放在(zai)有風經過的(de)棚子中(zhong)(zhong)(zhong),既不能(neng)讓他受(shou)潮,又不能(neng)把它封閉(bi)起來!

  另外,對于那(nei)些小而貴重的螺旋(xuan)鋼(gang)管,要把它封在沒(mei)有(you)腐蝕性的環境中(zhong),最好把它單獨(du)的放(fang)在放(fang)療的庫(ku)中(zhong),并及時做好標記!

  其三(san),保管這些螺旋鋼管的(de)倉庫,一定(ding)得(de)是(shi)在比較潔凈的(de)地方,而且不(bu)能是(shi)潮(chao)濕的(de)環境,因為畢(bi)竟是(shi)鋼制的(de)材料。

  其四,一(yi)些大型的(de)螺旋鋼管最好是進(jin)行龍(long)天的(de)存放的(de)。

  其五,一般的(de)要采用最為封閉的(de)庫房,可(ke)以(yi)保證(zheng)庫房的(de)安(an)全性能的(de)良好。

  最后,庫房要在晴天的(de)情況下,進行(xing)積極(ji)的(de)通(tong)風(feng),以使螺(luo)旋鋼(gang)管(guan)的(de)穩定性增(zeng)加(jia)!

  螺旋管(guan)反向彎(wan)曲(qu)(qu)性(xing)能。根據需(xu)方要(yao)求,螺旋管(guan)可進(jin)行反向彎(wan)曲(qu)(qu)性(xing)能試驗。反向彎(wan)曲(qu)(qu)試驗的(de)彎(wan)心直徑(jing)比彎(wan)曲(qu)(qu)試驗相應(ying)增加一個(ge)鋼(gang)管(guan)直徑(jing)。先正向彎(wan)曲(qu)(qu)45度(du),后(hou)反向彎(wan)曲(qu)(qu)23度(du),后(hou)反向彎(wan)曲(qu)(qu)23度(du)。經反向彎(wan)曲(qu)(qu)試驗后(hou),螺旋管(guan)受彎(wan)曲(qu)(qu)部位表(biao)面(mian)不得產生裂紋。

  尺寸、外形、重量和允許(xu)偏差(cha)。首先是長度及允許(xu)偏差(cha),其次公稱直徑范圍及推薦直徑,最后帶肋鋼(gang)盤的表面形狀及尺寸允許(xu)偏差(cha)

  彎(wan)曲性(xing)能。按(an)規定的彎(wan)心直徑彎(wan)曲180度(du)后,螺旋管受彎(wan)曲部(bu)位表面不得產(chan)生(sheng)裂紋(wen)。

  表(biao)(biao)面(mian)質量。螺(luo)旋(xuan)管(guan)表(biao)(biao)面(mian)不允(yun)(yun)許有(you)裂紋、結疤和折(zhe)疊(die)。螺(luo)旋(xuan)管(guan)表(biao)(biao)面(mian)允(yun)(yun)許有(you)凸塊(kuai),但不得超(chao)過橫肋的(de)高度,螺(luo)旋(xuan)管(guan)表(biao)(biao)面(mian)上(shang)其他缺陷的(de)深度和高度不得大于(yu)所(suo)在部位(wei)尺寸的(de)允(yun)(yun)許偏差。

對已安裝(zhuang)好的(de)(de)(de)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)在進(jin)(jin)(jin)口或者末端(duan)(duan)需要使用(yong)(yong)封頭(tou)(tou)封堵鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)在安裝(zhuang)過程中需要做水(shui)壓(ya)試(shi)驗時(shi),用(yong)(yong)封頭(tou)(tou)來封堵試(shi)驗段(duan)的(de)(de)(de)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)為遠(yuan)期工(gong)程或其他設(she)施從鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)預(yu)留出分支管(guan)(guan)(guan)(guan)的(de)(de)(de)情況下采用(yong)(yong)封頭(tou)(tou)。鋼(gang)(gang)(gang)板(ban)切割(ge)下料采用(yong)(yong)數控切割(ge)機或靠模(mo)半自動(dong)氣割(ge)方法進(jin)(jin)(jin)行。數控切割(ge)可以(yi)在平臺上(shang)一(yi)次性完成(cheng)(cheng)(cheng)(cheng)高精度(du)的(de)(de)(de)切割(ge)作(zuo)(zuo)業。而靠模(mo)為一(yi)薄鋼(gang)(gang)(gang)帶(dai),用(yong)(yong)磁性壓(ya)鐵沿劃線放出的(de)(de)(de)線壓(ya)定(ding),引導半自動(dong)切割(ge)機走向,這種(zhong)下料方法既能達到精度(du)要求,又經濟實用(yong)(yong)。加(jia)勁環的(de)(de)(de)制作(zuo)(zuo)和組(zu)(zu)裝(zhuang)。壓(ya)力鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)加(jia)勁環每圈(quan)由(you)多個(ge)弧形鋼(gang)(gang)(gang)板(ban)拼(pin)焊(han)(han)(han)(han)(han)而成(cheng)(cheng)(cheng)(cheng),在鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)上(shang)組(zu)(zu)裝(zhuang)焊(han)(han)(han)(han)(han)接(jie)(jie)成(cheng)(cheng)(cheng)(cheng)環。加(jia)勁環與(yu)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)組(zu)(zu)裝(zhuang),用(yong)(yong)“U”型附件(jian)點焊(han)(han)(han)(han)(han)在鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)壁上(shang),用(yong)(yong)千斤頂把加(jia)勁環壓(ya)向鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan),使間隙在0~3 mm范圍(wei)之內。在傳(chuan)統的(de)(de)(de)壓(ya)力鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)制造工(gong)藝中,從鋼(gang)(gang)(gang)板(ban)卷(juan)(juan)制成(cheng)(cheng)(cheng)(cheng)半圓(yuan)瓦塊到安裝(zhuang)間焊(han)(han)(han)(han)(han)成(cheng)(cheng)(cheng)(cheng)管(guan)(guan)(guan)(guan)段(duan)的(de)(de)(de)整個(ge)制作(zuo)(zuo)運(yun)(yun)輸組(zu)(zu)焊(han)(han)(han)(han)(han)過程,都是豎直狀態(tai),只(zhi)是在鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)管(guan)(guan)(guan)(guan)段(duan)吊運(yun)(yun)到引水(shui)道(dao)洞口,準備(bei)進(jin)(jin)(jin)洞安裝(zhuang)時(shi),才在翻轉平臺上(shang)翻轉90°放平。大型或超大型鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)自動(dong)化(hua)制造技術則(ze)采取瓦片水(shui)平狀態(tai)放置(zhi)(zhi),由(you)軌道(dao)小車運(yun)(yun)輸到組(zu)(zu)焊(han)(han)(han)(han)(han)裝(zhuang)置(zhi)(zhi)下端(duan)(duan),之后(hou)機械裝(zhuang)夾瓦片、自動(dong)焊(han)(han)(han)(han)(han)接(jie)(jie)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)縱縫(feng),鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)焊(han)(han)(han)(han)(han)接(jie)(jie)完成(cheng)(cheng)(cheng)(cheng)后(hou),最(zui)適合的(de)(de)(de)方式(shi)是直接(jie)(jie)由(you)軌道(dao)小車運(yun)(yun)送到安裝(zhuang)部位。卷(juan)(juan)板(ban)采用(yong)(yong)3輥或4輥帶(dai)液壓(ya)前后(hou)托(tuo)架的(de)(de)(de)卷(juan)(juan)板(ban)機進(jin)(jin)(jin)行。由(you)于液壓(ya)托(tuo)架能使長鋼(gang)(gang)(gang)板(ban)卷(juan)(juan)制成(cheng)(cheng)(cheng)(cheng)型,隨卷(juan)(juan)制弧度(du)托(tuo)起,不(bu)用(yong)(yong)吊車配合,重力變形小,瓦塊卷(juan)(juan)制成(cheng)(cheng)(cheng)(cheng)型質量好。焊(han)(han)(han)(han)(han)接(jie)(jie)預(yu)熱或后(hou)熱一(yi)般采用(yong)(yong)帶(dai)集中控制器(qi)的(de)(de)(de)電熱履帶(dai)板(ban)加(jia)熱,也可采用(yong)(yong)液化(hua)石油氣燃燒器(qi),直接(jie)(jie)用(yong)(yong)火焰預(yu)熱焊(han)(han)(han)(han)(han)縫(feng)。


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