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概述热收缩袋的注意事项有哪些

来源: 时间:2020-03-28 23:49:43 浏览次数:

热收缩带剥离后的阴极保护屏蔽问题
阴极保护电流只有到达金属表面才能够对抑制腐蚀起作用。对于收缩带补U的方式,由于收缩带与管体防腐层粘结能力差,受日照或L壤应力作用,容易起皱、开裂。
很难做到无气泡,无空鼓,如果水分进入收缩带F面,水分会沿焊缝进入内部。由于收缩带的绝缘作用,阴极保护电流无法到达腐蚀表面,不能阻止腐蚀。收缩套补口的优缺点:
收缩带具有很高的机械强度,可以提高管道下沟时的抗机械破坏能力。这也是当初使用收缩带的基本出发点。
管道表面加热难以均匀,管径大时尤为突出,造成收缩带收缩不均匀,管道埋地后,收缩带还在不断地蠕变、失去与管道之间的粘结力;
从外观一上不容易判断施工质量,对操作人员素质要求高,难以保证质量;
一旦水分进入收缩带下方,由于收缩带的电流屏蔽作用,阴极保护无法起作用,腐蚀无法防止。
对于管径超过900毫米的管道,国外基本上不用收缩带补口,而是采用防腐底漆加冷缠带的方式
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