Page 758 - Dust Explosions in the Process Industries

Index 717

Hazardous materials, 5-7 defined; 385-388,542
Heat conductivity,394-397 of dust clouds, 385-430,587-595
Heat flux ignition sources, 391-392 by electric spark, 40&419,476477
Heats of combustion, 6 by hot surfaces, 391,423426,562-563
Heats of various solids, specific, 220 by mechanical rubbing or impact, 419-423
Heinrich and Kowall venting theory, 460462, research on, 592-595
463 of dust layers by hot surfaces, 563
Hinged exp!osion doors, 90, 91; 92 process of, 385,583
Hut particle detection system, 63-64 self-heatingand self-ignitionin powder
Hot-piate test, 494-495, 560 deposits, 388-404
Hot spots of single particles, 587-595
accidental impaces and; 419.421,422423 aluminum, 2.5-253,588
as igniiion hazard, 14 carbon. 256-264
generation of, 516 coal, 256-264,589
from rubbing. grinding, and multiple impacts, magnesium, 253-255,588
420421 wood, 264-265
Hot surfaces zirconium, 255
enclosed, apparatus design for, 562-563 Ignition delay, 28, 335-336
as ignition hazard, 13, 61-62, 391,423-426, Ignition energy, minimum. See Minimum ignition
615-61 6 energy
research on, 590 Ignition sensitivity, 4, 34, 349,414,422
Human motivation (in explosion prevention), Ignition sources, 10, 11-20, 24,475
118-120 background, 10, 11
Hybrid mixtures electric sparks and arcs, 15-20, 65-66,475
effect of. 50-55 electrical apparatuses, 549
explosive properties test, 539-540 electrostatic discharges, 15-20, 65-66,
616-6 18
eliminationof, 57-66,475
IC1 Dessicarb (suppressant), 105, 109 enclosing, 560-568
Ignitability assessment heat from mechanical impacts, 13-14, 64-65
dispersibility,480-485 hot spots, 419423
electrical resistivity, 487488 hot surfaces, 13,61-62, 391,475,493498,
historical background, 473475 615-6 16
by laboratory tests, 491492 laser beam, 618-619
context of, 476 mechanical sparks, 23
flammability tests, 493498 miscellaneous,618-61 9
purpose, 475 open flames, 13,61,475
types, 477 preventing, 57-66
measurement of physical charactenstics of self-heating,493-498
dusts, 479-488 smolderingnests, 62-61
moisture content, 485-487 smolderingor burning dust, 11-13, 58-61,475
oxygen content influence in oxidizing gas, Ignition temperature, 291, 292, 385-388,411
540-542 determination,391,494495
particle size distnbution and specific surface self-heatingin powder deposits, 388404
area, 479480 Impact hazard, mechanical, 13-14,04-65,
philosophy of, 475477 419423
powder mechanical properties, 485 Inert dust
relationship between test result and real hazard, adding, 73
475477 in clouds, 55-56
test data tables influence of, 542
BIA. 681-685,686-701 uses of, 73
U.S. Bureau of Mines, 495, 505, 685, Inert gases, uses of, 59, 60, 139
702-703 Inerting, intrinsic, 131
testing problems, 636-641 Inerting by adding inert gas to air, 67-69,
Ignition 619-620,625-626
curves, 572-574,576 Inerting by adding noncombustibledust, 620-621