CN114646016A - 一种大型低温储罐检维修方法 - Google Patents

一种大型低温储罐检维修方法 Download PDF

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CN114646016A
CN114646016A CN202210309953.0A CN202210309953A CN114646016A CN 114646016 A CN114646016 A CN 114646016A CN 202210309953 A CN202210309953 A CN 202210309953A CN 114646016 A CN114646016 A CN 114646016A
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tank wall
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魏强
张晓东
李积杰
张春方
赵方华
方其
周思雯
张丹
胡水云
江炜
梁振江
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China National Air Separation Engineering Co ltd
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Abstract

本发明提供一种大型低温储罐检维修方法，设计合理，检修周期短，检修成本低。本发明包括如下步骤：(1)内罐底板检测；(2)内罐壁板检测；(3)外罐底环板检测；(4)外罐壁板检测；(5)排水孔改造；(6)夹层珠光砂清除；(7)罐壁弹性毡更换；(8)吊顶玻璃棉更换；(9)多点热电阻更换；(10)增加伺服液位计，用于测量液体液位；(11)增加平均温度计，用于测量液体温度。

Description

一种大型低温储罐检维修方法
技术领域
发明涉及一种大型低温储罐检维修方法，尤其涉及储存低温介质大型常压低温储罐，如LNG、液态乙烯、液态丙烯、液氨等低温储罐的检维修。
背景技术
越来越多的低温储罐应用于能源、石化行业，这些低温储罐多采用双层结构，內罐和外罐之间使用玻璃砖、膨胀珍珠岩和玻璃棉作为绝热保冷材料。储罐设计寿命一般为20年，在储罐到达设计寿命时或储罐运行中业主认为有必要检修时，需要对低温储罐进行开罐检测，然而开罐检测存在检修周期长、检修成本高等问题。
发明内容
本发明的目的在于克服现有技术中存在的上述不足，而提供一种设计合理、检修周期短、检修成本低的大型低温储罐检维修方法。
本发明解决上述问题所采用的技术方案是：一种大型低温储罐检维修方法，其特征在于：包括如下步骤：
(1)内罐底板检测：对内罐底板进行漏磁检测，对内罐底板焊缝真空箱检测和渗透或磁粉检测，检测比例均为100%；
(2)内罐壁板检测：对内罐壁板第一圈和第二圈纵焊缝渗透或磁粉检测以及超声波检测，第一圈和第二圈之间的环焊缝渗透或磁粉检测，第一圈和第二圈之间的丁字焊缝超声波检测，检测比例均为100%；
(3)外罐底环板检测：对外罐底环板进行高频导波检测，对外罐底环板焊缝进行渗透或磁粉检测，检测比例均为100%；
(4)外罐壁板检测：对外罐壁板第一圈纵焊缝、第一圈和第二圈壁板间环焊缝进行渗透或磁粉检测，外罐壁与外罐底大角焊缝进行渗透或磁粉检测，检测比例均为100%；
(5)排水孔改造：外罐壁板内侧增加排水孔补强板，排水孔补强板焊接固定在排水孔周围，对外罐壁板外侧原有的排水孔补强板焊缝进行渗透检测，对有缺陷的部位进行打磨补焊；
(6)夹层珠光砂清除：在外罐壁板开设临时孔，用于将夹层珠光砂运出；珠光砂运出后临时孔兼做通风口，设置防雨布；更换夹层珠光砂，夹层珠光砂重新填装前，将临时孔封堵；
(7)罐壁弹性毡更换：拆除原罐壁弹性毡后，在罐壁黏贴保温钉，再铺设新的弹性毡；
(8)吊顶玻璃棉更换：更换吊顶外沿的玻璃棉；
(9) 多点热电阻更换；多点热电阻采用夹套固定线缆，该夹套焊接在内罐壁板上；
(10) 增加伺服液位计，用于测量液体液位：分别在罐顶和吊顶开设孔位，在罐顶的孔位中固定有拱顶套管，在吊顶的孔位中固定有吊顶套管，开孔处设置加强筋；在内罐壁板上固定支撑；将提前预制好的伺服液位计套管吊装，穿过拱顶套管和吊顶套管后，焊接固定在支撑上，伺服液位计套管伸入到大型低温储罐的底部；在伺服液位计套管顶部固定法兰，伺服液位计与法兰连接固定，且伺服液位计的浮子装入伺服液位计套管中；
(11)增加平均温度计，用于测量液体温度。本发明步骤(6)中，所述的临时孔为两个，方位相对180°。
本发明步骤(7)中，吊顶上沿吊顶外沿向内铺设三排保温钉，用于弹性毡顶部固定，每排保温钉间距150mm。
本发明步骤(8)中，玻璃棉共两层，层与层之间的拼接缝要错开至少300mm。
本发明步骤(8)中，更换吊顶外沿向内2.8m区域的玻璃棉。
本发明步骤(10)中，所述的拱顶套管和吊顶套管为低温碳钢管道。
本发明步骤(10)中，在伺服液位计套管顶部固定法兰，伺服液位计与法兰连接固定。
本发明与现有技术相比，具有以下优点和效果：检测内容全面，操作简便，检修安全性高，项目成本可控，有效解决了大型低温储罐开罐检测困难的问题，降低由于开罐检测对储罐造成伤害，检修周期短，检修成本低，确保检维修施工周期，有效的提高了储罐的安全性和可靠性。
附图说明
图1是本发明实施例大型低温储罐的结构示意图。
图2是本发明实施例排水口的结构示意图。
图3是本发明实施例临时孔封堵示意图。
图4是本发明实施例的局部结构示意图。
具体实施方式
下面结合附图并通过实施例对发明作进一步的详细说明，以下实施例是对发明的解释而发明并不局限于以下实施例。
本发明实施例包括如下步骤：
(1)内罐底板检测：对内罐底板2进行漏磁检测，对内罐底板2焊缝（包括壁板和底板间的大角焊缝）真空箱检测和渗透或磁粉检测，检测比例均为100%；
(2)内罐壁板检测：对内罐壁板1第一圈和第二圈纵焊缝渗透或磁粉检测以及超声波检测，第一圈和第二圈之间的环焊缝渗透或磁粉检测，第一圈和第二圈之间的丁字焊缝超声波检测，检测比例均为100%；
(3)外罐底环板检测：对外罐底环板4进行高频导波检测，对外罐底环板4焊缝进行渗透或磁粉检测，检测比例均为100%；
(4)外罐壁板检测：对外罐壁板3第一圈纵焊缝、第一圈和第二圈壁板间环焊缝进行渗透或磁粉检测，外罐壁与外罐底大角焊缝进行渗透或磁粉检测，检测比例均为100%；
(5)排水孔改造：外罐壁板3内侧增加排水孔补强板14，排水孔补强板14焊接固定在排水孔13周围，对外罐壁板3外侧原有的排水孔补强板焊缝进行渗透检测，对有缺陷的部位进行打磨补焊。排水孔13为储罐外罐施工期间防止罐内积水所设，储罐外罐施工后，为保证储罐罐壁强度以及储罐的密封性，需对排水孔进行封堵。
(6)夹层珠光砂清除：在外罐壁板3开设两个临时孔5，方位相对180°，用于将夹层珠光砂运出；珠光砂运出后临时孔5兼做通风口，设置防雨布；更换夹层珠光砂，夹层珠光砂重新填装前，将临时孔5封堵。
(7)罐壁弹性毡更换：拆除原罐壁弹性毡后，在罐壁黏贴保温钉，再铺设新的弹性毡。吊顶上沿吊顶外沿向内铺设三排保温钉，用于弹性毡顶部固定，每排保温钉间距150mm。
(8)吊顶玻璃棉更换：更换吊顶外沿向内2.8m区域的玻璃棉，玻璃棉共两层，层与层之间的拼接缝要错开至少300mm；
(9) 多点热电阻更换：多点热电阻采用夹套固定线缆。夹套焊接在内罐壁板1上。
(10) 增加伺服液位计，用于测量液体液位：分别在罐顶6和吊顶15开设孔位，在罐顶6的孔位中焊接固定有拱顶套管9，在吊顶15的孔位中焊接固定有吊顶套管10，开孔处设置加强筋8；拱顶套管9和吊顶套管10为低温碳钢管道。在内罐壁板1上焊接固定支撑11。所有支撑11焊接完成后，将提前预制好的伺服液位计套管12吊装，穿过拱顶套管9和吊顶套管10后，焊接固定在支撑11上，伺服液位计套管12伸入到大型低温储罐的底部；再在伺服液位计套管12顶部焊接固定法兰7。伺服液位计与法兰7连接固定，且伺服液位计的浮子装入伺服液位计套管12中。此处与拱顶连接处采用套筒结构，套筒与管道间填充玻璃棉。
(11)增加平均温度计，用于测量液体温度：平均温度计套管为低温碳钢管道，管道支撑架焊接在内罐壁板1上。与拱顶连接处采用套筒结构，套筒与管道间填充玻璃棉。
此外，需要说明的是，本说明书中所描述的具体实施例，其零、部件的形状、所取名称等可以不同，本说明书中所描述的以上内容仅仅是对发明结构所作的举例说明。凡依据发明专利构思所述的构造、特征及原理所做的等效变化或者简单变化，均包括于发明专利的保护范围内。

Claims (6)

1.一种大型低温储罐检维修方法，其特征在于：包括如下步骤：
(1)内罐底板检测：对内罐底板进行漏磁检测，对内罐底板焊缝真空箱检测和渗透或磁粉检测，检测比例均为100%；
(2)内罐壁板检测：对内罐壁板第一圈和第二圈纵焊缝渗透或磁粉检测以及超声波检测，第一圈和第二圈之间的环焊缝渗透或磁粉检测，第一圈和第二圈之间的丁字焊缝超声波检测，检测比例均为100%；
(3)外罐底环板检测：对外罐底环板进行高频导波检测，对外罐底环板焊缝进行渗透或磁粉检测，检测比例均为100%；
(4)外罐壁板检测：对外罐壁板第一圈纵焊缝、第一圈和第二圈壁板间环焊缝进行渗透或磁粉检测，外罐壁与外罐底大角焊缝进行渗透或磁粉检测，检测比例均为100%；
(5)排水孔改造：外罐壁板内侧增加排水孔补强板，排水孔补强板焊接固定在排水孔周围，对外罐壁板外侧原有的排水孔补强板焊缝进行渗透检测，对有缺陷的部位进行打磨补焊；
(6)夹层珠光砂清除：在外罐壁板开设临时孔，用于将夹层珠光砂运出；珠光砂运出后临时孔兼做通风口，设置防雨布；更换夹层珠光砂，夹层珠光砂重新填装前，将临时孔封堵；
(7)罐壁弹性毡更换：拆除原罐壁弹性毡后，在罐壁黏贴保温钉，再铺设新的弹性毡；
(8)吊顶玻璃棉更换：更换吊顶外沿的玻璃棉；
(9) 多点热电阻更换；多点热电阻采用夹套固定线缆，该夹套焊接在内罐壁板上；
(10) 增加伺服液位计，用于测量液体液位：分别在罐顶和吊顶开设孔位，在罐顶的孔位中固定有拱顶套管，在吊顶的孔位中固定有吊顶套管，开孔处设置加强筋；在内罐壁板上固定支撑；将提前预制好的伺服液位计套管吊装，穿过拱顶套管和吊顶套管后，焊接固定在支撑上，伺服液位计套管伸入到大型低温储罐的底部；在伺服液位计套管顶部固定法兰，伺服液位计与法兰连接固定，且伺服液位计的浮子装入伺服液位计套管中；
(11)增加平均温度计，用于测量液体温度。
2.根据权利要求1所述的大型低温储罐检维修方法，其特征在于：步骤(6)中，所述的临时孔为两个，方位相对180°。
3.根据权利要求1所述的大型低温储罐检维修方法，其特征在于：步骤(7)中，吊顶上沿吊顶外沿向内铺设三排保温钉，用于弹性毡顶部固定，每排保温钉间距150mm。
4.根据权利要求1所述的大型低温储罐检维修方法，其特征在于：步骤(8)中，玻璃棉共两层，层与层之间的拼接缝要错开至少300mm。
5.根据权利要求1所述的大型低温储罐检维修方法，其特征在于：步骤(8)中，更换吊顶外沿向内2.8m区域的玻璃棉。
6.根据权利要求1所述的大型低温储罐检维修方法，其特征在于：步骤(10)中，所述的拱顶套管和吊顶套管为低温碳钢管道。
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