Full Answer
What is a detonating cord?
In fuse Detonating cord, also called Cordeau and Primacord, is a hollow cord filled with an explosive material. It is fired by a detonator and is capable of initiating the detonation of certain other explosives at any number of points and in any desired pattern. Read More.
What is a 50 grain detonating cord?
Rating. For example, "50 grain det. cord" refers to detonating cord which has 50 grains of explosive per foot of length—or approximately 10 g/m. This is a typical "default" rating for connecting charges for blasting; lighter detonating cords may be used for "low noise blasting" and movie special effects, while heavier cords,...
What can you do with high yield detonating cord?
Higher-yield detonating cord can be used to cut down small trees, although the process is very uneconomical compared to using bulk explosive, or even a chainsaw. High-yield detonating cord placed by divers has been used to remove old dock pilings and other underwater obstructions.
What is detcord made of?
Detonating cord (also called detonation cord, detacord, det. cord, detcord, primer cord or sun cord) is a thin, flexible plastic tube usually filled with pentaerythritol tetranitrate (PETN, pentrite). With the PETN exploding at a rate of approximately 6400 m/s, any common length of detonation cord appears to explode instantaneously.
Effects
As a transmission medium, it can act as a downline between the initiator (usually a trigger) and the blast area, and as a trunkline connecting several different explosive charges.
Rating
Detonating cord is rated in explosive mass per unit length. This is expressed in grains per foot in the United States, or in grams per metre elsewhere. A "grams per metre" rating will be roughly one fifth the "grains per foot" rating. For example, "50 grain det.
Direct employment
Low-yield detonating cord can be used as a precision cutting charge to remove cables, pipes, wiring, fiber optics, and other utility bundles by placing one or more complete wraps around the target. Detcord/Primacord is used in commercial boilers to break up clinkers (solidified coal ash slag) adhering to tube structures.
Colloquialisms
The Finnish army colloquialism for detonation cord is anopin pyykkinaru (mother-in-law's clothesline), as it resembles ordinary clothesline.
06 April 2012
1.The Explosive Train is a chain of explosions used to detonate a large, stable charge though what’s known as “Sympathetic Detonation” (one explosion causing another).
Explosives 103: Non-Electric Blasting Caps & Fuse
1.The Explosive Train is a chain of explosions used to detonate a large, stable charge though what’s known as “Sympathetic Detonation” (one explosion causing another).
blasting
Detonating cord (detonating fuse) resembles safety fuse but contains a high explosive instead of black powder. The first successful one, patented in France in 1908, consisted of a lead tube, about the same diameter as safety fuse, filled with a core of TNT.…
description
Detonating cord, also called Cordeau and Primacord, is a hollow cord filled with an explosive material. It is fired by a detonator and is capable of initiating the detonation of certain other explosives at any number of points and in any desired pattern.
What is the detonation velocity of explosives?
Detonation velocity is the speed with which the detonation shock wave travels through the explosive. It is a key, directly measurable indicator of explosive performance, but depends on density which must always be specified, and may be too low if the test charge diameter is not large enough. Especially for little studied explosives there may be divergent published values due to charge diameter issues. In liquid explosives, like nitroglycerin, there may be two detonation velocities, one much higher than the other. The detonation velocity values presented here are typically for the highest practical density which maximizes achievable detonation velocity.
How many detonation velocities are there in liquid explosives?
In liquid explosives, like nitroglycerin, there may be two detonation velocities, one much higher than the other. The detonation velocity values presented here are typically for the highest practical density which maximizes achievable detonation velocity.
Step 1: TESTING BURN RATE
To test the burn rate of time fuse, you must first cut off six inches from the roll and discard it. this ensures that any moisture the time fuse may have been exposed to will not effect the test of the burn rate. Next you will cut off three feet. it is very important that your measurements are precise so that you can get an accurate burn rate.
Step 2: CUTTING TIME FUSE
After you have tested the burn rate of the time fuse, measure and cut it at a length that will burn in the desired amount of time. To do this you have to take the desired time delay and convert it into seconds.
Step 3: DO THE MATH
Next you need to take that number and divide it by the BR for that roll of time fuse.
Step 4: CONTINUE THE MATH
The number to the left of the decimal is your desired feet of time fuse. Now you will find the amount of inches you will need, so you will take the number to the right of the decimal and multiply it by .12, this will give you the remainder in inches.
Step 5: FINAL ANSWER
The number to the left of the decimal is inches. Since, in the example, there is no number to the left of the decimal, then the correct would be 0 inches. No we have 7 feet and 0 inches. We want to get the number down to the lowest possible form, So now we need to find 1/16 of an inch.
5 Comments
Oh thanks! Thats Awesome! So, when were you USMC? -PKT (Formerly RoAr)
Overview
Detonating cord (also called detonation cord, detacord, det. cord, detcord, primer cord or sun cord) is a thin, flexible plastic tube usually filled with pentaerythritol tetranitrate (PETN, pentrite). With the PETN exploding at a rate of approximately 6,400 m/s (21,000 ft/s), any common length of detonation cord appears to explode instantaneously. It is a high-speed fuse which explodes, rath…
Effects
As a transmission medium, it can act as a downline between the initiator (usually a trigger) and the blast area, and as a trunkline connecting several different explosive charges. As a timing mechanism, detonation cord detonates at a very reliable rate (about 7,000–8,000 m/s or 23,000–26,000 ft/s), enabling engineers to control the pattern in which charges are detonated. This is particularly useful for demolitions, when structural elements need to be destroyed in a sp…
Rating
Detonating cord is rated in explosive mass per unit length. This is expressed in grains per foot in the United States, or in grams per metre elsewhere. A "grams per metre" rating will be roughly one fifth the "grains per foot" rating. For example, "50 grain det. cord" refers to detonating cord which has 50 grains of explosive per foot of length—or approximately 10 g/m. This is a typical "default" rating for connecting charges for blasting; lighter detonating cords may be used for "low noise bl…
Direct employment
Low-yield detonating cord can be used as a precision cutting charge to remove cables, pipes, wiring, fiber optics, and other utility bundles by placing one or more complete wraps around the target. Detonation cord is used in commercial boilers to break up clinkers (solidified coal ash slag) adhering to tube structures. Also a vertical centered cord being lowered into the water of a drilled well can remove any clogging that obstructs water flow. Higher-yield detonating cord can …
Colloquialisms
In Filipino, the corresponding word mitsa has come to be used in the phrase mitsa ng buhay, which translates to "detonating cord of [one's] life", a metaphor for something that is very likely to cause one's death via direct jeopardization (e.g. extreme sports, versus smoking).
In media
Detonation cord was referenced in the 2009 film A Perfect Getaway by Timothy Olyphant's character as "a handy tool".
A length of detonation cord was used to clear a path through a minefield in the 2009 film Terminator Salvation.
Detonation cord was shown to be used by US cavalry troops to clear trees from a landing zone i…
See also
• Shock tube detonator - another type of tubular explosive detonation system with a very light loading of explosive and no direct blasting effect
External links
• "Primacord Technical Information" (PDF). Dyno Nobel.
• "Cordtex Technical Information" (PDF). Orica.