ME405_Lecture_26 - ME 405 Fall 2006 Professor John M....

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Unformatted text preview: ME 405 Fall 2006 Professor John M. Cimbala Lecture 26 11/06/2006 Today, we will : Discuss the influence of local ventilation on general ventilation Discuss Control of Vapors from Open Surface Vessels in Section 6.2 Do some example problems capture of vapors Discuss Design Plates and the ACGIH Ventilation Manual in Section 6.3 If time, discuss Bulk Materials Handling in Section 6.4 Table 6.2 Hazard potential and rate of contaminant evolution (abstracted from ACGIH, 2001). hazard potential health standard for gas or vapor (PPM) health standard for mist (mg/m 3 ) flash point ( o F) A 0 to 10 0 to 0.1 - B 11 to 100 0.11 to 1.0 under 100 C 101 to 500 1.1 to 10 100 to 200 D over 500 over 10 over 200 rate liquid temperature ( F) degrees below boiling ( F) evaporation time 1 (hr) gassing 2 1 over 200 0 to 20 0 to 3 (fast) high 2 150 to 200 21 to 50 3 to 12 (medium) medium 3 94 to 149 51 to 100 12 to 50 (slow) low 4 under 94 over 100 over 50 (nil) nil 1 time for 100% evaporation 2 extent to which gas or vapor are generated: rate depends on the physical process and the solution concentration and temperature Table 6.3 Minimum control velocities (FPM) for undisturbed locations (abstracted from ACGIH,...
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This note was uploaded on 07/23/2008 for the course ME 521 taught by Professor Cimbala during the Fall '07 term at Pennsylvania State University, University Park.

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ME405_Lecture_26 - ME 405 Fall 2006 Professor John M....

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