Safety and Reliability Engineering Past Paper

1474 WordsFeb 2, 20136 Pages
EG40JQ/12 UNIVERSITY OF ABERDEEN SESSION 2011 – 2012 Degree Examination in EG40JQ SAFETY AND RELIABILITY ENGINEERING Friday 20 January 2012 Notes: (i) (ii) 2.00 p.m. – 5.00 p.m. Candidates ARE permitted to use an approved calculator Data sheets are attached to the paper. Candidates should attempt all FIVE questions. REGULATIONS: (i) You must not have in your possession any material other than that expressly permitted in the rules appropriate to this examination. Where this is permitted, such material must not be amended, annotated or modified in any way. (ii) You must not have in your possession any material that could be determined as giving you an advantage in the examination. (iii) You must…show more content…
It is given that t = 6.25mm. Basic variable σy D Mean Coefficient of variation 240 MPa 0.11 225 mm 0.004 [6 marks] Qu. 3 continued overleaf/ 3/7 EG40JQ/12 Qu. 3 continued/ c) A projectile of mass M is flying at a velocity V following a minor gas explosion o n an offshore installation. Write down the safety margin corresponding to an event that the Kinetic Energy (KE = 0.5MV2 ) of the projectile is greater than 22500 J. Using an appropriate FORM approach, determine the reliability index corresponding to this safety margin and comment on the sensitivity of the variables (limit your calculations to 2 iterations). Assume that the variables are statistically independent and normally distributed with the following parameters. Basic variable M V Mean 12 kg 59 m/s Standard deviation 0.12 kg 2.95 m/s [11 marks] Question 4. A tank containing gasoline is surrounded by a circular dike of diameter 10 m. The gasoline leak s and occupies the area bounded by the dike. If there is ignition, calculate: (a) The total radiative flux from the flame. Use the following correlation for the geometry of the flame: H/D = 42{m’/[ a(gD)]} 0.61 where H = height of the flame (m), d = diameter of the pool of liquid (m), m’ = mass transfer rate from pool to flame (kg s-1), a = density of air = 1.17 kg m-3 and g = acceleration due to gravity = 9.8 m s-2. Make
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