TAILIEUCHUNG - What Went Wrong Part 3

Tham khảo tài liệu 'what went wrong part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Preparation for Maintenance 33 closed and a drain valve in between opened. A flow through the drain valve showed that one of the isolating valves was leaking so the drain valve was closed and a message left for the employees working the next shift telling them to open the drain valve before work started. Nothing was written on the permit-to-work. The message was not passed on the drain valve was not opened and the fitter broke the joint the wrong way removing all the bolts. The joint blew apart and the fitter received head injuries from which he will never fully recover 37 . c It is not only flammable oils that cause accidents. In another incident two workers were badly scalded when removing the cover from a large valve on a hot water line although the gauge pressure W as only 9 in. of water psi or bar . They removed all the nuts attached the cover to a chain block and tried to lift it. To release the cover they tried to rock it. The cover suddenly released itself and hot water flowed out onto the workers legs. Use of Excessive Force A joint on an 8-in. line containing a hot solvent had to be remade. The two sides were 34-in. out of line. There was a crane in the plant at the time so it was decided to use it to lift one of the lines slightly. The lifting strap pulled against a 3 -in. branch and broke it off Figure 1-11 . It was not a good idea to use a crane for a job like this on a line full of process material. Fortunately the leaking vapor did not ignite although Joint to be Remade 3 4 Branch Figure 1-11. A branch broke when a crane was used to move a live line 34 What Went Wrong nearby water was being pumped out of an excavation. At one time a diesel pump would have been used but the use of diesel pumps had been banned only a few months before the incident. Section describes an explosion caused by the failure of nuts that had been tightened with excessive force. Ignorance of Material strength a When a plant came back on line after

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TAILIEUCHUNG - Chia sẻ tài liệu không giới hạn
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