Properties of Explosives

8/18/2019 Properties of Explosives

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RO ERTIES OF

EX LOSIVES

ByKeltech Energies limited


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Properties of Explosives

• Density

• VOD –Velocity of Detonation

•

Water resistivity• Viscosity

• Strength

•

Sensitivity• Thermal stability

• Fume haracteristics


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Density

• Explosives normally work eectively in aparticular Range of density.

• For Emulsion it is 0.8 to !." g#cc

• $ax explosives energy is utili%ed at !.! to !.!

• Explosives tends to De&agrate 'elow 0.8 g#cc

• Explosives may 'ecome insensitive in densityover !." gm#(( )known as (ritical Density*

• Explosives performance may get aected if

water pocketing is t+ere 'etween twocartridges.


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,-D


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ater Resistivity

• !ood e"#losives should have $aterresistance #ro#erties to sustain strengthof the %roduct&

• Water in the bore hole may a'ect the%roduct %erformance if contaminated$ithin it&

• While doing S(E Bul) charging $eshould charge do$n the hole for u#$ardsdis#lacement of $ater&


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Viscosity

• Viscosity is im#ortant in ane"#losives for retention of its form

and e"#losives constituents&• *t hel#s for retention of the !as

bubbles in the Slurry and emulsion

e"#losives&


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Strength

• (ost of the e"#losives are made u# ofO"idi+er and Fuel #hase $hich attributesto the Strength of the e"#losives&

• The O"ygen balance is re,uired forim#arting ma"imum strength to theE"#losives&

•Strength of an e"#losives maydeteoriate if contaminated $ith $ater ordust #resent inside the hole&


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Sensitivity

• /+e sensitivity of t+e explosivesdetermines t+e ease at w+ic+ t+eexplosives gets ignited#detonated

• t also depends on t+e ntensity of factors

like Friction#mpact#1eat#2tatic )F21*• 3n explosives sensitive to any detonator is

called cap sensitive explosives.

• 3n Explosives sensitive to (ast 'oosters or

4D 5oosters are called column c+arge or6on cap sensitive Explosives.

• 2ensitivity of an explosives can 'eincreased 'y c+emical or p+ysical met+ods.


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Thermal Stability

• E"#losives com#osition should be stableunder all normal condition of usage&

• D!(S sti#ulates that -o Blast holes

shall be charged if the tem#erature ofthe borehole e"ceeds ./ Degs&0uenching of holes has to be done by

$ater before blasting&• Only KE1 has a##roved e"#losives

Kelve"23// a##licable for 4ot Strata&


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Fume Characteristics

• E"#losives should liberate minimum

fumes after detonation&• -O5 fumes6harmful gasses are

restricted

•

om#lete detonation of E"#losives$ill liberate no dangerous fumes&


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MMU

• 4igh #ressure tri##ing system&

• 4igh Tem#erature tri##ing system&• 7u#ture disc

• 8uto o' dead end #um#ing 1imit S$itch &

• Sto##age of #um# after delivery by counter setting&

• Tem#erature indicator control 9T*:• Emergency battery cuto' s$itch&

• 8ir ;ushing system for cleaning the residual sensiti+edemulsion&

•

8ntistatic hose&• Delivery hose dia less than critical dia&

• Static Discharge chain&


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(onclusion

8ll the #ro#erties of the e"#losives areim#ortant $hich can be attained by#ro#er mi"ing of the 7( and right

delivery&

orrect


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Properties of Explosives

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