Quiz: Source, Dispersion and LOPA Prognosis- Particular person CA2 Create Prognosis using Source Mannequin Deploy ALOHA machine and generate the toxic and dispersion contours. Summarize the results and slay a comparison by your statement. Create LOPA to manufacture additional just protection layer(s) Field: An ammonia storage tank leaks at its backside piping by an efficient opening with a diameter of 50 mm. NH3 is saved below saturated liquid conditions at 11.58 bar and 30oC. Keep of leak in piping is at 10-meter elevation above the ground stage. Regular dinky print of the NH3 storage tank are shown within the following draw. a. Estimate NH3 liquid spill (in kg) collected within the backside dike in a single hour. (Judge (i) regular advise between spill rate and evaporation rate. (ii) Evaporation occurs over total inferior portion of the dike). Estimate the total NH3 vapor release to air by flashing and evaporation. NH3 liquid temperature after depressurizing by 50 mm opening to atmospheric rigidity (atmospheric boiling point of NH3) = – 33oC Ammonia liquid density at -33oC = 673.1 kg/m3 Warmth of vaporization of NH3 at atmospheric rigidity= 1170.87kJ/kg Distinction in explicit volume between vapor and liquid NH3= 1.38115 m3/kg Cp for NH3= 2.103 kJ/kg.Okay Dike dimensions: 10m(L) x 10m(B) x 0.6 m(H). (8 Marks) b. Create toxic dispersion prognosis for launched NH3 using ALOHA machine. Judge launch nation conditions and atmospheric steadiness class B. Wind velocity is 2 m/s. Judge a humidity of 80%. Operate’s ambient temperature is 30oC. Use ALOHA Gaussian and Heavy gas dispersion objects to manufacture ERPG1, ERPG2 and IDLH probability contours. Explain any assumptions extinct within the model. (6 Marks) c) Create LOPA and manufacture an acceptable resolution to lower the NH3 storage tank overpressure frequency to correctly at some point soon of the acceptable frequency. Attributable to adjustments in NH3 gain-up rate (noteworthy higher than the long-established assemble rate), PSV on top of the NH3 storage tank is below sized. Operator mistake at some point soon of NH3 gain-up could well cease up in overpressure within the tank. Explain any assumptions extinct. Use conventional PFD (likelihood of failure on ask) values of protection layers from lecture notes/ textbook or any diverse reference (If exterior supply of reference is extinct, please cite it clearly). If SIS (security instrumented machine) alternate recommendations are required, manufacture an SRS (Safety requirement specifications) file. (6 Marks) Initiating tournament frequencies for overpressure are: Initiating tournament Frequency Operator failure 10-1 per year Acceptable overpressure frequency for the advise is 10-5 incidents/year. – submit by strategy of “Assignments” portal on Blackboard by 2359 hrs. seventh Nov 202 Write My Assignment Hire a Genuine Essay & Assignment Writer for ending your Tutorial Assessments Native Singapore Writers Personnel 100% Plagiarism-Free Essay Very top Pleasure Charge Free Revision On-Time Offer
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