TAILIEUCHUNG - What Went Wrong Part 7

Tham khảo tài liệu 'what went wrong part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Leaks 153 Figure 7-4. A soft plastic top hat plug left was fitted to the end of a railway carriage brake pipe to keep it clean. It was the same color as the end of the pipe and was not noticed and removed before the pipe was installed. The brakes failed and the train overran. A more rigid plug with a larger lip right would have failed the brake test and would have been more visible. Photo courtesy of Roger Ford. A more rigid plug with a larger lip as fitted to the other end of each pipe Figure 7-4 right would have caused the brake test to fail. The larger lip and a different color would have made the plug more visible. However plastic bags tied over the ends would be a better way of keeping the hoses clean 25 Other hose failures are described in Section . Cooling Coils The cooling coil in a storage tank developed a small leak. To prevent the liquid in the tank from leaking into the cooling water the coil was isolated but kept up to pressure by closing and slip-plating the exit water valve but leaving the inlet valve open. The tank contained an aqueous solution of a toxic acid so a small leak of water into the tank contents did not matter and was far preferable to a leak of the acid into the cooling water. Another coil provided all the cooling necessary. Ten years later there was a pressure surge on the cooling water lines when the cooling water pumps were changed over this caused a sample 154 What Went Wrong valve on the inlet water line to the coil to leak inside the building. The leaking water was contaminated with acid which had been lying in the coil for ten years since the leak first occurred. There were no instructions for the changeover of the cooling water pumps and on the occasion of the incident the valves were operated in an unusual order. CONTROL OF LEAKS Emergency Isolation Valves EIVs Many fires have been prevented or quickly extinguished by remotely operated emergency isolation valves. We cannot install them in the lines leading .

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