R. Meyer J. Köhler A. Homburg Explosives

77 Detonation
fuses for the safe initiation of W ANFO contain 40 and 100 g/m
PETN.
Detonating fuses serve to initiate blasting charges; the initiation is safe
if the cord is coiled serveral times around the cartridge. To initiate
several charges, branch cords are attached to a “main cord”. In
Germany, priming by detonating cords is mandatory in W Large Hole
Blasting and in W Coyote Blasting.
Detonating cords are also employed for seismic shots in the desert
and at sea. They are also used for clearing blasts in oil and gas wells,
which restore the flow from blocked boreholes; special cords with a
wire reinforced sheat are used for this purpose.
For the use of detonating cords in the determination of the detonation
rate of explosives W Dautriche Method.
Transfer fuses which have no priming effect are manufactured in the
USA. Those containing only a fraction of one gram of PETN per meter
and a lead sheathing are known as “mild detonating fuses”. Cords
containing about 2 g of the explosive per meter inside a plasticimpregnated
network are manufactured as “Primadet”.
Detonating Cord Downline; Zündabzweigung
The section of detonating cord that extends within the blast hole from
the ground surface down to the explosive charge.
Detonating Cord MS Connectors; Millisekunden-Verzögerer
Non-electric, short-interval (millisecond) delay devices for use in delaying
blasts which are initiated by detonating cord.
Detonating Cord Trunirline; Leit-Sprengschnur; ligne de cordeau dètonant
The line of detonating cord that is used to connect and initiate other
lines of detonating cord.
Detonation
Detonation; détonation
Detonation is a chemical reaction given by an explosive substance
which produces a shock wave. High temperature and pressure gradients
are generated in the wave front, so that the chemical reaction is
initiated instantaneously. Detonation velocities lie in the approximate
range of 1500 to 9000 m/s = 5000 to 30000 ft/s; slower explosive
reactions, which are propagated by thermal conduction and radiation,
are known as W Deflagration.