化工设计竞赛SITE,DATA乙烯储罐蒸汽云(0001)

　SITE DATA:

　Location: DONGYING , SHANDONG, CHINA

　Building Air Exchanges Per Hour: 0.62 (unsheltered single storied)

　Time: July 18, 2019

　1413 hours ST (using computer"s clock)

　 CHEMICAL DATA:

　Chemical Name: ETHYLENE

　CAS Number: 74-85-1

　Molecular Weight: 28.05 g/mol

　PAC-1: 600 ppm

　 PAC-2: 6600 ppm

　 PAC-3: 40000 ppm

　LEL: 27000 ppm

　 UEL: 360000 ppm

　Ambient Boiling Point: -154.7?F

　Vapor Pressure at Ambient Temperature: greater than 1 atm

　Ambient Saturation Concentration: 1,000,000 ppm or 100.0%

　 ATMOSPHERIC DATA: (MANUAL INPUT OF DATA)

　 Wind: 2.7 meters/second from NW at 10 meters

　Ground Roughness: open country

　 Cloud Cover: 7 tenths

　Air Temperature: 35?C

　 Stability Class: B

　No Inversion Height

　Relative Humidity: 75%

　 SOURCE STRENGTH:

　Leak from hole in spherical tank

　 Flammable chemical escaping from tank (not burning)

　Tank Diameter: 14.2 meters

　 Tank Volume: 1,499 cubic meters

　Tank contains gas only

　 Internal Temperature: 35?C

　Chemical Mass in Tank: 555.56 tons

　Circular Opening Diameter: 0.5 inches

　Release Duration: ALOHA limited the duration to 1 hour

　Max Average Sustained Release Rate: 483 pounds/min

　 (averaged over a minute or more)

　 Total Amount Released: 28,176 pounds

　 THREAT ZONE:

　 Model Run: Heavy Gas

　 Red

　 : 42 yards --- (40000 ppm = PAC-3)

　Note: Threat zone was not drawn because effects of near-field patchiness

　make dispersion predictions less reliable for short distances.

　Orange: 136 yards --- (6600 ppm = PAC-2)

　Yellow: 485 yards --- (600 ppm = PAC-1)