Sunday, February 08, 2009
chronology of failure
Engineer's log: Chronology of Failure Labels: stories
Friday, 6 February 2009
0430: Alarm sounded in the main control building. Strain gauge detected severe circumferential stresses in the Waste Water Filtration Casing, Unit A.
0435: Engineer ignored the alarm as it was suspected to be a slight upset in the process flow causing fatigue stress in the main support strut.
0450: Second alarm sounded in the main control building. A pressure gauge had shown excessive built up pressure in the frontal supply area, near the west side of the Waste Water Storage Tank. Engineer acknowledged the alarm this time as the pressure could not have been due to fatigue stress in the main support strut.
0530: The on-call mechanic took too long to respond to this Priority Level 1 incident and further disciplinary action shall be taken on this matter. Strain gauge and pressure gauge showed extremely high levels of stress and pressure. It was observed that these high readings is usually present only during the production and discharge of nanobots.
0550: On-call mechanic perform some troubleshooting checks on the system and diagnosed the problem as a calcification of foreign minerals in the filtration system, leading to clustering. Due to the size of the foreign particle cluster exceeding filtration media size, the filter media suffers breakthrough. Due to the breakthrough, the foreign particle is suspected to be lodged in the flexible hose connecting the Waste Waster Filtration Casing (Unit A) to the Waste Water Storage Tank, thus causing a blockage in flow, which then led to the build up in pressure. The on-call mechanic determines that he cannot proceed further, and recommends the Specialist Engineer perform a Non-Destructive Ultrasonic Test to confirm presence of the blockage. The on-call mechanic pumps suppressant chemicals into the system to reduce the effect of pressure build-up.
0600: Filtration system pressure is maintained at dangerously high levels. Most major equipments are put on standby mode to reduce stress on the overall system.
0930: Specialist Engineer (SE) arrives, but work cannot commence due to administrative red tape and bureaucratic procedures.
1100: SE starts troubleshooting the system distress. SE performs the Non-Destructive Ultrasonic Test and confirms the on-call mechanic's diagnosis of the presence of a foreign object blockage. SE requests a Full Computed Tomograph Scan of the system to determine the exact location of the blockage and to determine the next course of action.
1130: Owner's Engineer decides that depending on the results of the Full Computed Tomograph Scan, a major overhaul of the filtration system maybe required. As such, the Owner's Engineer decides to postpone the scan and bring in his preferred crew to do the job.
1300: Flow throughout the system fluctuates. Pressure fluctuates between safe levels and dangerous levels.
1630: Owner's Engineer preferred crew arrives on-scene and takes over based on the morning report. This new SE disagrees with some of the recommendations made by the morning SE. However, he proceeds with the Full Computed Tomograph Scan of the system.
1800: The system does not suffer further pressure fluctuations and is put on partial standby for the remainder of the day. The SE shall review the test results in the morning and decide on the next course of action. It was also ordered that the main system be put on standby at midnight to prepare for overhauling works the next day. Neither fluids nor solids are to be pumped in to the system at all costs.