【Weekly Topic】Corrosion and Protection: Talking about Things at Work (2011.10.8-2011.10.16)
Thread Content
Dear colleagues: Corrosion is common in our chemical enterprises, and it is essential to carry out protection measures. Please share what work was done regarding corrosion and protection in your respective companies over the past week. We also encourage you to introduce any good practices so that we can learn from each other and improve our efforts in preventing corrosion. Remarks: 1. It is preferable to provide examples that occurred this week; a single incident can be described, such as: gasket damage at xxx location, with replacement carried out ； It is also possible to conduct a deeper analysis of the reasons: such as aging over time, or the presence of organic solvents mixed in the medium ； 2. It must be related to corrosion and protection ； 3. I hope everyone will participate actively.
It’s raining today, so the steam insulation work, which was supposed to be completed today, might not get finished after all. The newly replaced steam pipes, with diameters of DN400+DN300, were urgently descaled and painted yesterday due to time constraints; rust was removed using a hand grinder, and two coats of anti-rust paint were applied. The results aren’t particularly good; the main reason is the lack of time. It’s a pipeline at a high altitude, and although mechanical rust removal was used, it wasn’t thorough. There’s nothing that can be done about that, but fortunately there is insulation in place.
The newly built tanks No. 3 and No. 4 have begun to undergo anti-corrosion treatment. Due to heavy fog in these days, the anti-corrosion work cannot be carried out, which has delayed the project timeline by two days. It’s urgent!
Recently, corrosion and thinning have occurred on the roofs of the slurry storage tanks at our plant; we are now formulating an emergency response plan! Replace the vault once the tank is completely cleaned!
Recently, corrosion and thinning have occurred on the roofs of the slurry storage tanks at our plant; we are now formulating an emergency response plan! Replace the vault once the tank is completely cleaned!
The first coat of anti-corrosion resin paint has been applied to the last two tanks, and preparation is underway to apply the lining fabric. It is estimated that another seven days will be needed; the progress is a bit slow – I’m in a hurry.
Next week, the main tasks will be to conduct targeted thickness measurements at various injection points, as well as improving the basic data related to the storage tanks!
This month, a core pull inspection of the liquid hydrocarbon heat exchanger revealed blocked tubes, severe corrosion in the tube side, blackish-yellow scale on the tube sheet, localized corrosion-induced depressions, and significant corrosion on both the tube sheet and the flanges； The pipe opening is tapered, the surface has a layer of oil residue, and thickness measurements indicate some corrosion-induced thinning. It mainly causes under-scale corrosion! Cause analysis: The reasons for the corrosion and failure of water coolers are multiple and relatively complex. There are mainly the following reasons: 1) Electrochemical corrosion ； 2) Circulating corrosion of chlorides ； 3) Stress corrosion ；
This month, a core pull inspection of the liquid hydrocarbon heat exchanger revealed blocked tubes, severe corrosion in the tube side, blackish-yellow scale on the tube sheet, localized corrosion-induced depressions, and significant corrosion on both the tube sheet and the flanges； The pipe opening is tapered, the surface has a layer of oil residue, and thickness measurements indicate some corrosion-induced thinning. It mainly causes under-scale corrosion! Cause analysis: The reasons for the corrosion and failure of water coolers are multiple and relatively complex. There are mainly the following reasons: 1) Electrochemical corrosion ； 2) Circulating corrosion of chlorides ； 3) Stress corrosion ；
Reply to 1# Litaol1314: When manufacturing the horizontal tanks at our factory, no sandblasting was used for rust removal; instead, manual rust removal was employed. Additionally, the primer used was of poor quality, which led to problems. As a result, before the pipelines could be installed, the surface of the tanks started to bubble and peel. The manufacturer later carried out additional rust removal on some of the tanks. I’ve been using it for a year now, and problems have arisen again: the surfaces of several containers are severely blistered and peeling, making maintenance very difficult at the moment. Corrosion is very severe at our factory by the sea, haha. This is the result of saving money. I hope everyone will pay attention to anti-corrosion measures, as it will be very troublesome to carry out repairs later on. .