Stress corrosion and high-temperature creep
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What are the cases of stress corrosion and high-temperature creep that must be considered in container design and safety assessment? Reward those who actively speak up: handshake This post was last edited by salbert on 2009-3-31 11:08 ]
Or rather, let’s cite a few examples of failures caused by stress corrosion or high-temperature creep
On March 5, 1998, a massive explosion occurred at two 400 m3 spherical tanks at a liquefied petroleum gas station in Xi’an. The sequence of events was as follows: at 4:40 p.m., a leak was detected in the flange of the sewage pipeline at the bottom of Tank No. 1. Although firefighters and plant workers tried their best to contain the leak, the lack of advanced sealing techniques meant that the leakage persisted for about 3 hours. The entire plant area was filled with petroleum gas, and electric sparks from the power distribution room caused an explosion, leading to a large fire in the plant. This increased the temperature of the tank significantly, ultimately resulting in a physical explosion. The flange leakage is related to the fatigue fracture of a fastening bolt. The nature of the accident was determined to be a equipment failure.
Everyone, please share where we can find examples of equipment accidents
There are reference books. Go to the corrosion area; you might find it there. I have one here; it’s just not convenient to send it.
Thank you. If there are any more specific details, I hope you can still give me some guidance
In hydrogen-containing equipment, stress corrosion cracking of stainless steel caused by polyoxosulfuric acids (H2SXO6, X=3–6) is particularly dangerous. Iron sulfide formed in high-temperature hydrogen sulfide and hydrogen environments reacts with moisture present and oxygen in the air when the reactor is shut down or under maintenance, resulting in polysulfuric acids; certain tensile stresses can then cause austenitic stainless steel to crack.
You can take a look at API RP 571-2003, \"Damage Mechanisms Affecting Fixed Equipment in the Refining Industry\", which can be downloaded at the following address: http://bbs.hcbbs.com/viewthread.php?tid=337924&highlight=Damage%2BMechanisms. This post was last edited by etsen on 2009-4-2 at 18:58.]