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1981年,我们在农安和垂杨泵站的换阀动火施工中首次应用我所研制的 DN 型管道封堵器并获得成功,取得了一些经验。下面主要介绍在农安泵站更换212~#阀时管道封堵的情况。农安泵站的212~#罐前阀长期以来处于打不开,关不严的状态,严重影响安全平稳输油,急待更换。212~#线是和主干线连通的,如果不用管道封堵器就必须关闭204~#阀,使干线停输,对212~#线进行扫线;同时一万米~3油罐必须降到安全罐位以下,这等于将大罐内的油完全抽出,因为212~#线的管中心距罐底板仅0.55米。做到这一点相当困难又无把握。如果使用管道封堵器,那么停输、扫线和降罐位均无需进行。根据我们以往在铁岭泵站原油管道上进行的 DN
In 1981, we made the first successful application of the DN-type pipeline occluder developed by our company in the valve-opening construction of Nong’an and Chuangyang pumping stations and gained some experience. The following describes the agricultural safety pump station replacement 212 ~ # valve when the pipeline blockage situation. Nong’an pumping station 212 ~ # tank valve has long been in the open, the state is not strict, seriously affecting the safe and stable oil, urgent replacement. 212 ~ # line is connected with the main line, if you do not have a pipe occluder must be closed 204 ~ # valve, the main line stop transmission, 212 ~ # line sweeping line; the same time 10,000 ~ 3 tank must be reduced to Safe tank below, which is equivalent to a large tank of oil completely out, because 212 ~ # line tube center from the tank floor only 0.55 meters. To do this is quite difficult and not sure. If a pipe blocker is used, no shutdowns, wipes, and drop pots are required. According to our previous DNT at Tieling pumping station crude oil pipeline