Det Cord and how does it work?
steved
I understand that det cord primarily consists of PETN and the shockwaves
generated detonate the explosive composition.
However, is det cord itself an 'initiator' and if so, what 'initiates'
det cord, and by what means, electric or non electric?
Thanks you.
snap...@my-deja.com
I have read somewere that is electric.
Sent via Deja.com http://www.deja.com/
Share what you know. Learn what you don't.
APOPHIS NEWS
explosive is to send a large amount of electrons through the explosive.
Explosives being unstable will ignite due the the sudden and large
disturbance made by the electrons.
If u r using one you light, ( i think) its cause the cord, after you light
it travels to the explosive and is very hot, this heat is transferred to the
explosive on contact and KABOOM. If i got this wrong someone correct me!! :)
steved <ste...@hotmail.com> wrote in message
news:378ECF...@hotmail.com...
Bill Nelson
: If you are using electrical wire as det cord then the way it sets off the
: explosive is to send a large amount of electrons through the explosive.
Wrong. You use an electric cap. The cap initates the det cord.
: Explosives being unstable will ignite due the the sudden and large
: disturbance made by the electrons.
Some will - such as primary explosives. But it is the heat, not the
electron flow, which initiates the primary explosive.
: If u r using one you light, ( i think) its cause the cord, after you light
: it travels to the explosive and is very hot, this heat is transferred to the
: explosive on contact and KABOOM. If i got this wrong someone correct me!! :)
Pretty garbled explanation. The bridge wire in the detonator gets hot,
which initiates the explosive (or the explosive primer).
--
Bill Nelson (bi...@peak.org)
Bill Nelson
: >
: > However, is det cord itself an 'initiator' and if so, what 'initiates'
: > det cord, and by what means, electric or non electric?
Det cord can be initiated by either an electric cap or a fused cap.
: I have read somewere that is electric.
That would pose a problem if you did not have electric caps, wouldn't
it?
: Sent via Deja.com http://www.deja.com/
: Share what you know. Learn what you don't.
Sharing something that is wrong is worse than just keeping silent in
the first place.
--
Bill Nelson (bi...@peak.org)
APOPHIS NEWS
Bill Nelson <bi...@peak.org> wrote in message
news:7mp65t$enh$2...@bashir.peak.org...
> APOPHIS NEWS (apo...@ihug.com.au) wrote:
>
> : If you are using electrical wire as det cord then the way it sets off
the
> : explosive is to send a large amount of electrons through the explosive.
>
> Wrong. You use an electric cap. The cap initates the det cord.
>
> : Explosives being unstable will ignite due the the sudden and large
> : disturbance made by the electrons.
>
> Some will - such as primary explosives. But it is the heat, not the
> electron flow, which initiates the primary explosive.
Yes but the electron flow generates the heat to begin with.
>
> : If u r using one you light, ( i think) its cause the cord, after you
light
> : it travels to the explosive and is very hot, this heat is transferred to
the
> : explosive on contact and KABOOM. If i got this wrong someone correct
me!! :)
>
> Pretty garbled explanation. The bridge wire in the detonator gets hot,
> which initiates the explosive (or the explosive primer).
>
> --
> Bill Nelson (bi...@peak.org)
>
Thanx have been out of school for a bit and could not clearly remember what
i learned in chemistry.
Sam Lowrey
"APOPHIS NEWS" <apo...@ihug.com.au> wrote:
>
> Bill Nelson <bi...@peak.org> wrote in message
> news:7mp65t$enh$2...@bashir.peak.org...
> > APOPHIS NEWS (apo...@ihug.com.au) wrote:
> >
> > : If you are using electrical wire as det cord then the way it sets
off
> the
> > : explosive is to send a large amount of electrons through the
explosive.
> >
> > Wrong. You use an electric cap. The cap initates the det cord.
> >
> > : Explosives being unstable will ignite due the the sudden and large
> > : disturbance made by the electrons.
> >
> > Some will - such as primary explosives. But it is the heat, not the
> > electron flow, which initiates the primary explosive.
>
> Yes but the electron flow generates the heat to begin with.
>
electron flow = electricity
accelerated vibration of atoms = heat
there is a big difference
--
Engineer's Law:
Good, Fast, Cheap - Pick any two.
aloysio
blasting cap to other demo charges. The det cord itself can be used as
main charge in especial aplications, such as cutting logs that are not very
thick.
Aloysio.
steved escreveu na mensagem <378ECF...@hotmail.com>...
>How does det cord work, that is, how is it 'initiated'?
>
>I understand that det cord primarily consists of PETN and the shockwaves
>generated detonate the explosive composition.
>
>However, is det cord itself an 'initiator' and if so, what 'initiates'
>det cord, and by what means, electric or non electric?
>
>Thanks you.
Lindsay H. Greene, esq.
>blasting cap to other demo charges. The det cord itself can be used as
>main charge in especial aplications, such as cutting logs that are not very
>thick.
Or cutting down trees, or cutting scale models at specific
points for the movie industry.
Stay greene!
----
he...@western.wave.ca
www.angelfire.com/al/pyrotech/ &
www.angelfire.com/al/pyrotech/propmechanics.html
ICQ UIN: 24221175 Authorization Required
The revolution is coming, my friends. I'll see
you on the front lines.
donald haarmann
>
> I understand that det cord primarily consists of PETN and the shockwaves
> generated detonate the explosive composition.
>
> However, is det cord itself an 'initiator' and if so, what 'initiates'
> det cord, and by what means, electric or non electric?
>
> Thanks you.
Medal of Honor Citation:
*RAY, BERNARD J.
Rank and organization: First Lieutenant, U.S. Army, Company F, 8th Infantry, 4th
Infantry Division. Place and date: Hurtgen Forest near Schevenhutte,
Germany, 17 November 1944. Entered service at: Baldwin, N.Y. Birth:
Brooklyn, N.Y. G.O. No.: 115, 8 December 1945. Citation: He was platoon
leader with Company F, 8th Infantry, on 17 November 1944, during the drive
through the Hurtgen Forest near Schevenhutte, Germany. The American
forces attacked in wet, bitterly cold weather over rough, wooded terrain,
meeting brutal resistance from positions spaced throughout the forest behind
minefields and wire obstacles. Small arms, machinegun, mortar, and artillery
fire caused heavy casualties in the ranks when Company F was halted by a
concertina-type wire barrier. Under heavy fire, 1st Lt. Ray reorganized his men
and prepared to blow a path through the entanglement, a task which appeared
impossible of accomplishment and from which others tried to dissuade him.
With implacable determination to clear the way, he placed explosive caps in
his pockets, obtained several bangalore torpedoes, and then wrapped a length
of highly explosive primer cord about his body. He dashed forward under direct
fire, reached the barbed wire and prepared his demolition charge as mortar
shells, which were being aimed at him alone, came steadily nearer his
completely exposed position. He had placed a torpedo under the wire and was
connecting it to a charge he carried when he was severely wounded by a
bursting mortar shell. Apparently realizing that he would fail in his self-imposed
mission unless he completed it in a few moments, he made a supremely
gallant decision. With the primer cord still wound about his body and the
explosive caps in his pocket, he completed a hasty wiring system and
unhesitatingly thrust down on the handle of the charger, destroying himself
with the wire barricade in the resulting blast. By the deliberate sacrifice of his
life, Ist Lt. Ray enabled his company to continue its attack, resumption of
which was of positive significance in gaining the approaches to the Cologne
Plain.
--
donald j haarmann - independently dubious
----------------------------
aloysio
xtramad
Detonating cord is as you stated, a flexible plastic tube filled with
PETN (Pentaerythriol tetranitrate).
The detonating cord is set of by a blasting cap, electrical or
otherwise.
PETN has a detonation velocity of 7100-7960m/s.
The shockwave generated by the PETN is what sets of the explosive.
The correct way to assemble this explosive train is to tape the
blasting cap to the detonating cord,
the detonating cord is taped or tied alongside the dynamite stick or
moulded into the plastic explosive.
Detonating cord is used to conect explosive charges so that they go of
almost simultaneuosly.
--
Posted via Talkway - http://www.talkway.com
Exchange ideas on practically anything (tm).
fulano de tal
wrote:
>Let me set things strait here.
>Detonating cord is as you stated, a flexible plastic tube
Non-El uses a flexible plastic tube, but det cord is a stranded,
coated, fiber affair.
> filled with
>PETN (Pentaerythriol tetranitrate).
>The detonating cord is set of by a blasting cap, electrical or
>otherwise.
>PETN has a detonation velocity of 7100-7960m/s.
Everything else in your post sounds correct except that I must coment
about PETN detonation velocity: In powdered form in det cord you
quote very fine numbers. As The Eternal Defender (tm) of PETN,
though, it's my obligation to point out that monocrystalline PETN,
with the proper crystallographic orientation, is documented to
detonate at 8800 m/s.
donald haarmann
<nK...@webtv.net> wrote in message news:23192-37...@newsd-153.iap.bryant.webtv.net...
> I was watching TLC a couple of weeks ago, and they were talking about
> strip mining. They said they use the same primers, that are used for
> 12ga shot shells, to set off the det cord [??] <
Doubt it. Shock tube yes, det cord? NO.
I don't know if that's
> possible or what, but that's what they said.
>
> N.R.
--
---------------
donald j haarmann - colophon
full...@aspi.net
>
> I was watching TLC a couple of weeks ago, and they were talking about
> strip mining. They said they use the same primers, that are used for
> possible or what, but that's what they said.
>
> N.R.
Shotgun primers can be used to initiate non-el shock tube, but I
seriously doubt it would initiate true det cord.
Raul C. Beltizer
What is a shock tube?
KaboomMn
( blasting cap ) must be used. Shock tubing however, can be initiated with a
shot gun primer. These are usually hand held mechanical devices, similar to
the military type safety fuse starters , which are a firing pin device.
Shock tubing can also be initiated with piezoelectric devices. Similar
devices are use to fire claymore mines electrically. Piezo electric current
is generated when a piezo crystal, which is either natural ( quartz for
ex. )l or manmade, receives applied stress. This stress or pressure, applied
to the crystal, produces a electrical signal, which initiates the detonator.
Anti-Tank rounds, of the shape charge type, use the same type of firing
device ( piezo-electric ).
--
Boomer
Kabo...@Gateway.Net
If you see me running you better catch up
<nK...@webtv.net> wrote in message
news:23192-37...@newsd-153.iap.bryant.webtv.net...
aloysio
there is a trick for this.
Be safe,
Aloysio.
p.s. What is TLC?
full...@aspi.net escreveu na mensagem <3799810B...@aspi.net>...
>nK...@webtv.net wrote:
>>
>> I was watching TLC a couple of weeks ago, and they were talking about
>> strip mining. They said they use the same primers, that are used for
>> 12ga shot shells, to set off the det cord. I don't know if that's
>> possible or what, but that's what they said.
>>
>> N.R.
>
fulano de tal
wrote:
>Piezo electric current
>is generated when a piezo crystal, which is either natural ( quartz for
>ex. )l or manmade, receives applied stress. This stress or pressure, applied
>to the crystal, produces a electrical signal, which initiates the detonator.
Piezoelectric devices are also very useful to measure the detonation
velocity of a substance. Two ceramic resonators afixed to a charge at
a calibrated distance apart generate high voltage spikes as the
detonaton front passes them. It's a simple task to measure the
elapsed time between the two spikes (such as with a digital event
timer). The detonation velocity is simply the distance between the
sensors divided by the elapsed time between spikes.
Obviously the ceramic resonators are not reusable. Fortunately they
cost only 18 cents in bulk.
Raul C. Beltizer
<alo...@infolink.com.br> wrote:
> Aloysio.
>
>p.s. What is TLC?
>
The Learning Channel. Cable TV.
Mark
aloysio wrote in message <379ba...@news.infolink.com.br>...
>It is possible to detonate det cord with shotgun shells' primers. Of
course
>there is a trick for this.
>Be safe,
>
>p.s. What is TLC?
The Tender Loving Care channel.
Well, OK it's The Learning Channel.
full...@aspi.net
> >>
> >> I was watching TLC a couple of weeks ago, and they were talking about
> >> strip mining. They said they use the same primers, that are used for
> >> 12ga shot shells, to set off the det cord. I don't know if that's
> >> possible or what, but that's what they said.
> >>
> >> N.R.
> >
> >Shotgun primers can be used to initiate non-el shock tube, but I
> >seriously doubt it would initiate true det cord.
Shock tube is a detonating mechanism like burning/fused detonators or
electrical detonators. It is thin plastic tubing that has an inside
coating of high explosive like PETN. When it is set off the shock
propogates *very* quickly to a detonator that operates normally.
Because it propogates so quickly it is suitable for linking charges into
chains as a replacement for detcord. In this usage it is superior to
detcord because it is a bit cheaper, but mostly because it is safer.
Det cord tends to open up a channel down to the charge, letting out some
energy and producing the "rifle effect" danger of launching
projectiles. Because shock tube has such a low energy it does not
create a channel down to the charge, no energy leaks, and nothing is
launched.