Is it good to use nitrogen protection when welding and maintaining pipelines? ——Everyone is welcome to participate in [Spring Has Arrived in Haichuan] to share the beauty of spring from various places
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Let’s discuss this together. ----------------------------------------------------------------------------------- “Spring Has Arrived in Haichuan” is a seasonal event held in the Leisure Area, as well as on the forum. It has the following features: -- The event is organized by the Leisure Area as a whole, with participants sharing the beautiful spring scenery from various places. -- Many forum users take part in it; last year, over 100 users shared more than 300 posts. -- The event takes place from late March to mid-May, spanning two months, which allows companies to be properly showcased and attract attention. We welcome enterprises that are interested in sponsoring this event; such sponsorship can help enhance the reputation of those companies, as well as show support for the HaiChuan sharing platform. ------------------------------------------------------------------------------------------------------ We also invite all members of HaiChuan to actively participate in these sharing activities. Let’s share happily and enjoy the beauty of spring together. --------------------------------------------------------------------- 【Spring has arrived in HaiChuan】 HaiChuan members gather in Chengdu – The first gathering of Chengdu’s HaiChuan members: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1953290 (Source: HaiChuan Chemical Forum Website) 【Spring has arrived in HaiChuan】 Original post – Searching for spring all day long, yet still unable to find it ； Spring is already in sight, to some extent! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1941700 (Source: Haichuan Chemical Industry Forum) 【Spring has arrived in Haichuan】 Micro azalea bonsai still under refinement https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1945263 (Source: Haichuan Chemical Industry Forum) 【Spring has arrived in Haichuan】 The cuttings of bougainvillea have begun to bloom https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1944836 (Source: Haichuan Chemical Industry Forum) 【Spring has arrived in Haichuan】——Plum blossoms have bloomed! ! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1946084 (Source: Haichuan Chemical Industry Forum) 【Spring has arrived in Haichuan】The red maples (varieties from the Orangutan line) have begun to sprout leaves. https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1946247 (Source: Haichuan Chemical Industry Forum) 【Spring has arrived in Haichuan】——Viewing the lanes with black-tiled roofs and blue stones in the Jiangnan region, willows by the Su Causeway shrouded in mist, and apricot blossoms covering the branches! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1946871 (Source: Haichuan Chemical Industry Forum) 【Spring has arrived in Haichuan】 Azaleas that have just been potted. https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1947023 (Source: Haichuan Chemical Industry Forum) 【Spring has arrived in Haichuan】 A gentle breeze blows; I’m going to the ends of the earth! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1953708 (Source: Haichuan Chemical Industry Forum) 【Spring has arrived in Haichuan】 As spring gives way to winter, flowers bloom at certain times. https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1953306 (Source: Haichuan Chemical Industry Forum) 【Spring has arrived in Haichuan】——Meeting magnolias after a spring rain! ! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1951152 (Source: Haichuan Chemical Industry Forum) 【Spring has arrived in Haichuan】Pingzhi Xunzi https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1950405 (Source: Haichuan Chemical Industry Forum)
It’s not allowed, I’ve done this before too
From the perspective of fire prevention principles, after the pipeline has been properly purged, it is flushed again with a small amount of nitrogen on the day of construction, and a blast test is conducted to ensure that everything is satisfactory. (There is likely another key step here: after confirmation that everything is in order, both ends of the pipeline must be sealed to prevent flammable materials and oxygen from entering the pipeline again.) By filling the pipeline with a small amount of nitrogen during welding, the oxygen content inside the pipeline can be reduced, thereby preventing the formation of all the conditions necessary for combustion and avoiding accidents such as fires and explosions. However, the pressure of nitrogen inside the pipeline must be slightly positive to prevent a large amount of nitrogen from leaking and accumulating under special circumstances, which could lead to asphyxiation.