CN1200971A - 开裂负压管道的修补方法 - Google Patents

开裂负压管道的修补方法 Download PDF

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CN1200971A
CN1200971A CN 97104370 CN97104370A CN1200971A CN 1200971 A CN1200971 A CN 1200971A CN 97104370 CN97104370 CN 97104370 CN 97104370 A CN97104370 A CN 97104370A CN 1200971 A CN1200971 A CN 1200971A
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shroud ring
steel band
negative
mending
pressure pipeline
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CN1072543C (zh
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魏国瑞
窦永祥
詹志福
姚仁仕
周金水
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Shanghai Baosteel Chemical Co Ltd
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Baoshan Iron and Steel Co Ltd
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Abstract

本发明公开了一种开裂负压管道的修补方法,属于管道损害的修补领域。该方法是先将开裂部位补好,然后包扎钢带,再将包箍包在最外面钢带上,然后通惰性气体到包箍空间内,最后将包箍焊接在开裂负压管道上。该方法可在不停产情况下对开裂负压管道进行焊接修补,安全可靠,适用于一切负压管道开裂修补。

Description

开裂负压管道的修补方法
本发明涉及一种开裂负压管道的修补方法,属于管道损害的修补领域。
当焦化厂、煤气传输等用的负压管道发生开裂时,如不及时采取一定措施,将造成管内气体中的含氧量高升,以致引起严重后果。现有技术一般均用环氧将开裂部位包住作临时处理,但这种处理不持久、可靠性差,特别是开裂较大时更是不可靠。如作进一步处理,则只有停产焊接。停产焊接时,先关掉阀门,用N2置换负压管道内气体,然后再焊接,耗时2~4小时,但这样处理会给用气企业造成非常大的经济损失,因为有的企业用气是不能停的。但一般又不敢在非停产状态下焊接,因为管道内气体为负压,极易混入空气,焊接易引起爆炸等损害,造成更大的损失。
本发明的目的在于克服上述现有技术中的缺点,提供一种能在不停产情况下进行焊接修理、安全可靠的开裂负压管道的修补方法。
本发明的目的是这样实现的:
一种开裂负压管道的修补方法,具有以下步骤:
1)将开裂部位用RG金属修补棒或环氧树脂补好;
2)在开裂部位包0~4层钢带,每一层钢带的内接触面均匀涂一层胶;
3)将包箍固定在开裂部位处或包在最外面钢带上,包箍与负压管道贴合严密;
4)将惰性气体用接管接到包箍上的通气孔上,待包箍与管道贴合待焊部位有微量惰性气体漏出时将包箍焊接在负压管道上;
5)焊接完毕后,在闷头上涂上螺纹密封胶后将闷头拧在包箍的通气孔内。
本发明方法还可以在上述步骤2)完成后先在钢带上及其周围全面涂一层防烧保护剂或缠绕一层石棉绳后再进行步骤3)。
本发明相比于现有技术具有如下优点:可在不停产情况下对开裂负压管道进行焊接修补,使用气企业的生产能正常进行,避免了不必要的损失;安全可靠、简便易行,较停产焊接简单,节约了时间和经费。
下面对附图进行说明:
图1:包有钢带的负压管道开裂部位示意图
图2:实现本发明方法所用包箍的结构示意图
图3:包箍A-A剖视图
图4:焊好包箍时的开裂部位示意图
下面介绍本发明方法的一个实施例:
一焦炉煤气排送机进口管道(φ1300)对接环焊缝严重开裂,开裂长度约为周长的3/4,最大开裂缝隙约20mm,几乎成断开状,管道煤气为负压(-4000mmH2O)。采用本发明方法先将开裂缝隙用RG金属修补棒补好以防止空气由此进入管道系统。在一条钢带的内接触面均匀涂一层胶(CT-737+阻燃剂),将钢带包扎在开裂缝隙处,保证钢带与煤气管道贴合良好;重复上面操作,包扎第二、三、四层钢带,第四层钢带两端用卡子1固定。包扎钢带的目的在于提高开裂处的强度和密封性,防止开裂处扩展而断开。然后在钢带上及其周围全面涂一层防烧保护剂(乐泰771)。根据包上第四层钢带时管子的外径制作好包箍,包箍由两个半圆形半包箍对合而成,半包箍包括侧板2和盖板3,侧板2垂直于盖板3端部焊接在盖板3两端,盖板3的中间有一通气孔4。将包箍包在最外面钢带上,包箍的侧板2与煤气管道贴合严密;然后将氩气用接管接到包箍上的通气孔4上,保证包箍空间内为正压(0.8~1.5kg/cm2),待包箍与管道贴合待焊部位有微量氩气漏出时将包箍焊接在煤气管道上;焊接完毕后,关闭氩气,在与通气孔4相适应的闷头上涂上螺纹密封胶后将闷头拧在通气孔4内,待冷却后,对焊缝进行检查,不允许有裂纹等缺陷。检查无缺陷后,即完成了对开裂缝隙的修补。
当开裂缝隙较小时,也可以不包扎钢带而直接将包箍固定在开裂部位,效果一样的好。

Claims (2)

1.一种开裂负压管道的修补方法,是先将开裂部位用RG金属修补棒或环氧树脂补好,其特征在于:该方法有以下步骤
1)将开裂部位用RG金属修补棒或环氧树脂补好;
2)在开裂部位包0~4层钢带,每一层钢带的内接触面均匀涂一层胶;
3)将包箍固定在开裂部位处或包在最外面钢带上,包箍与负压管道贴合严密;
4)将惰性气体用接管接到包箍上的通气孔上,待包箍与管道贴合待焊部位有微量惰性气体漏出时将包箍焊接在负压管道上;
5)焊接完毕后,在闷头上涂上螺纹密封胶后将闷头拧在包箍的通气孔内。
2.根据权利要求1所述的修补方法,其特征在于:在所述步骤2)完成后先在钢带上及其周围全面涂一层防烧保护剂或缠绕一层石棉绳后再进行步骤3)。
CN 97104370 1997-05-29 1997-05-29 开裂负压管道的修补方法 Expired - Fee Related CN1072543C (zh)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101347862B (zh) * 2008-06-06 2011-04-06 上汽通用五菱汽车股份有限公司 一种应用微负压于管道裂缝焊补的作业方法
CN104028909A (zh) * 2014-06-23 2014-09-10 济钢集团有限公司 一种可燃气体管道及容器漏点带压焊接用装置及方法
CN107442959A (zh) * 2017-08-30 2017-12-08 山东四化环保节能工程有限公司 化工厂焦炉风机出口煤气管道不停产包焊的方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101347862B (zh) * 2008-06-06 2011-04-06 上汽通用五菱汽车股份有限公司 一种应用微负压于管道裂缝焊补的作业方法
CN104028909A (zh) * 2014-06-23 2014-09-10 济钢集团有限公司 一种可燃气体管道及容器漏点带压焊接用装置及方法
CN107442959A (zh) * 2017-08-30 2017-12-08 山东四化环保节能工程有限公司 化工厂焦炉风机出口煤气管道不停产包焊的方法
CN107442959B (zh) * 2017-08-30 2019-08-06 山东四化环保节能工程有限公司 化工厂焦炉风机出口煤气管道不停产包焊的方法

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