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现场仪表容易出现故障的原因

返回列表 来源:本站 发布日期: 2021-12-13 08:50:20
       现在使用的检测仪表和 DCS 的可靠性已很高,但在现场应用中还是会出现这样或那样的故障。从多年维修工作中发现,DCS 和盘装显示控制仪表的故障率很低而现场检测仪表和控制系统,工作在恶劣的环境下,即使产品质量很好故障发生率仍较高,而且间接地影响到DCS 的运行,引发现场仪表出现故障的原因如下:
 
(1)环境因素
①仪表密封不良引发的故障。密封问题引发的故障占有很大比例。仪表的电线进线口密封不良是导致雨水、冷凝水、粉尘、潮湿气体进入仪表内部的主要原因。不能忽视电线进线的密封,安装、维护时要规范安装并拧紧密封接头;密封性差可采用硅胶、玻璃胶浇灌封死接口。现场仪表维护时没有将仪表表壳拧紧,没有将密封垫圈安装到位、导致水或其他腐蚀性介质进入仪表内造成故障。维护中要将密封垫圈安装到位,或拧紧固定螺栓。
仪表安装在露天、潮湿的环境要有仪表保护箱,没有条件时可采用塑料布将其包严实,虽然美观性差,但是可以降低现场仪表故障率,要定期解开或更换包裹仪表的塑料布,打开仪表表壳晾干里面的冷凝水,或选择外壳防护等级较高的仪表。
②仪表受腐蚀引发的故障。现场仪表都会受到各种介质的腐蚀。时间一长、表壳或螺钉拧不开的现象常发生;表壳被腐蚀坏、使表内电路板或机械部件出现故障。测量介质对导压管、阀门腐蚀造成的故障率也不低。尽量按工艺介质选择管道、阀门的材料,采取隔离措施增强仪表的抗腐蚀性。
③环境振动引发的故障,现场仪表受环境振动的影响也会出现故障,如仪表的固定螺栓松动,导压管卡套松动,仪表接线端子松动,焊口出现裂缝等,维护中可采取螺栓配弹簧垫片、拧紧固定螺拴、定期检查并拧紧卡套的措施,会同工艺、设备人员采取防振动措施,增加橡胶垫、支撑钢架来缓解振动。
④工艺、设备原因引发的故障。工艺、设备原因引发的故障常发生、如锅炉炉膛内的耐火砖脱落把热电偶保护套管打坏,导致热电偶烧坏。水泵出口振动过大使压力表指针脱落。电气设备产生的电磁场,仪表及控制系统由于干扰引发的故障也占一定比例。
 
(2)人为因素
①设计选型、安装不当引发的故障,仪表选型或安装方法不合理、不规范会引起仪表不能正常工作或不能长期正常工作,可根据实际情况采取一定措施或进行改造。
②维护不当引发的故障。
③人为原因引发的故障。常发生在安装及停车大检修期间,一种是设备检修工在检修中造成仪表损坏,如在塔、罐内检修把测温元件的保护套管碰弯,起吊设备时把现场仪表或仪表部件碰坏,把仪表电线、电缆损坏等;另一种是仪表的部件或电线、电缆被盗。
 
(3)仪表本身因素
由于仪表质量问题引发的故障在现场也是有的。有的仪表是偶然发生故障。有规律地发生故障,或者经常出现故障的仪表,应考虑该型或该批次的仪表可能存在质量问题,应重新选型,改用质量过硬的产品。

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