What are the advantages of nonel initiation over electrical blasting?
Also Noise level reduced significantly by nonel initiation system. The overall cost of blasting in NONEL is very less compared to electrical blasting and hence it optimizes the cost of blasting. REFERENCES
What is Nonel?
Non electric initiation system, NONEL, invented by Per Anders Persson (Nitro Nobel, later Dyno Nobel); introduced to market in 1972.NONEL products can be used with all cast boosters, dynamites and capsensitive - explosives.
What is a Nonel detonator?
The design of nonel detonators incorporates patented technology, including the Cushion Disk (CD) and Delay Ignition Buffer (DIB) to provide reliability and accuracy in all blasting applications.
What is electric Super™ blasting?
Our Electric Super™ products are the original electric blasting caps proven by generations of blasters NONEL®, the original patented nonelectric detonator brand is today's most widely used detonator and eliminates most electric detonator hazards Electronic delay timing is much more accurate than pyrotechnic delay timing.
What does Nonel stand for?
Acronym. Definition. NONEL. Non-Electric (firing system for explosives)
What are detonators used for?
Detonators are small devices used for detonating a high explosive. In a nuclear weapon, the nuclear part (called the core or the pit) is surrounded by high explosives. The detonation of those high explosives is what causes the pit to implode (compress) and create nuclear yield.
How do explosive detonators work?
Instead of heating up the explosive, the EBW detonator wire is heated so quickly by the high firing current that the wire actually vaporizes and explodes due to electric resistance heating. That electrically driven explosion then fires the detonator's initiator explosive (usually PETN).
What explosive is in shock tube?
The most common product is 3 mm outer diameter and 1 mm inner diameter, with a tiny dusting of HMX/aluminum explosive powder on the tubing's inner surface, which detonates down the tube at a speed greater than 2,000 m/s (6,500 ft/s) but does not burst the tube.
What are the four types of explosives?
There are three fundamental types: mechanical, nuclear, and chemical. A mechanical explosive is one that depends on a physical reaction, such as overloading a container with compressed air.
What is another word for detonator?
What is another word for detonator?torpedotorpgrenademineincendiarychargeshotpineappleammunitionfireworks23 more rows
What are the 3 types of explosives?
1. Introduction blasting and bulk explosives (explosives used for commercial blasting applications or for their manufacture); ... perforating explosives (intended for use in the oil and gas well industry); ... special-application explosives (high explosives used for other applications, including primary explosives).
Can detonators explode?
In the IME 22 container tests, detonators began exploding in as little as 17 minutes in one test and not for 2-1/2 hours in another test. Detonators in the metal/plywood boxes began to explode in about 15 minutes but with minor alterations, were able to contain the detonators.
What is C4 made of?
C4 was used during the Vietnam War as part of demolition blocks; today, it is commonly used in both military and civilian settings for demolition and flares. C4 is composed of RDX (91%), dioctyl sebacate (5.3%), polyisobutylene (2.1%), and mineral/motor oil (1.6%) [1].
What is Nonel tube?
Nonel is a shock tube detonator designed to initiate explosions, generally for the purpose of demolition of buildings and for use in the blasting of rock in mines and quarries.
What is Nonel shock tube?
NONEL LEAD LINE shock tube is a small diameter, three-layer plastic tube coated on the innermost wall with a reactive explosive compound.
What is shock tube filled with?
A shock tube has two main sections: a driver and a driven section. Before an experiment, a single-use diaphragm is placed between the two sections. The driver section is filled with a low-molecular weight gas (often helium) and the driven section is filled with the desired test gas.
What is a detonator device?
blasting cap, also called Detonator, device that initiates the detonation of a charge of a high explosive by subjecting it to percussion by a shock wave.
What does detonator mean?
Definition of detonator : a device or small quantity of explosive used for detonating a high explosive.
How long do railway detonators last?
The detonators which are effective after their normal shelf life of 7 or 5 years (as the case may be) need not be shifted to Branch lines, after the expiry of their normal shelf life, irrespective of their year of manufacture.
How do electric detonators work?
electric detonator – any device containing an initiating or primary explosive that is used for initiating detonation in another explosives material and uses direct electrical energy from the device's leads (wires, springs, contacts, etc.) to fire an igniter to initiate the device.
What is blasting in mining?
Blasting is an essential component in mining and one of the most economical method of rock excavation applicable to both surface and underground mines. The effect of blasting arising from the mining operation is one of the fundamental problems in the mining industry. Rock fragmentation also plays a pivotal role in large scale mining because of its direct effect on cost of drilling, blasting, secondary blasting, crushing and there-by affecting the overall cost of production. The research investigates the effect of initiation device on environment and the production cost. The objectives of the research were achieved through field measurement and data collection. Various informations pertaining to blasting agents and accessories used for blasting operations were also collected. The results revealed that the flyrock, noise and vibration generated during blasting with NONEL are found to be minimal as compared to the safety fuse and the electrical methods. It is also observed that NONEL initiation increases blasting efficiency and also optimize the cost of blasting.
What is the purpose of blasting?
Blasting is the process of breaking of bulk rock masses into loose forms, using explosive compounds. Here, the primary role is played by the explosives. The explosives are the substances or devices used in blasting. The explosives are used to produce a volume of rapidly expanding gas that exerts sudden pressure on its surroundings and break the mass into pieces. There are three common types of explosives used for blasting as chemical, mechanical, and nuclear explosives. The first chemical explosive was gunpowder. Germans manufactured gunpowder in the early 1300s. A detonator is a device used to trigger this explosive device. Detonators can be chemically, mechanically, or electrically initiated. Different explosives require different amounts of energy to detonate. Detonation is a necessity for the explosive to get triggered for blasting.
What is the most commonly used explosive in Dalmia cement?
The commonly used explosive in Dalmia Cements Bharat Ltd. is Ammonium Nitrate Fuel Oil (ANFO). Ammonium nitrate (AN) based explosives are the cheapest and most frequently used commercial explosives. ANFO explosives are more frequently used for blasting than the other two types of ammonium relatively low price, and safety during blasting operations, simple manufacture and the possibility of mechanical loading of boreholes are the main reasons for its frequent use. A significant number of the individual factors that influence the detonation parameters of ANFO have been tested and determined. For pure ANFO, the main factors are the properties of the ANprills, the fuel/oil ratio, the density and charge diameter. It is possible to influence the detonation parameters of ANFO by adding flammable or non-flammable components. The AN/FO ratio was determined by an ANFO test, after the sample had been mixed, and was 94.5/5.5. The measured ANFO bulk density was 823 kg/m3.
What is a primer in explosives?
If an explosives column is not initiated properly, its optimum energy cannot be generated. The terms “primer” and “booster” are often confused. Primer is a unit of cap-sensitive explosive used to initiate other explosives or blasting agents. A primer contains a detonator or other initiating device such as detonating cord. The primer cartridge should be assembled at the work-site. The transport of cap primers is hazardous and is against the regulation of most countries. Priming should be done correctly by experienced shot-firers. The commonly used booster in Dalmia Cement Bharat Ltd. is KELVEX P. Sometimes, after detonation, a low sensitivity explosive may show signs of losing the VOD progressively along its column. This may arise when an ANFO charge is contaminated with water. The boosters can be placed at appropriate intervals (about 30 times the blast hole diameter) to increase the VOD along the explosives column. Boosters can be placed at appropriate spots where the ground is especially hard and requires extra pressure for satisfactory breakage.
What is blast hole drilling?
Blast hole Drilling is a technique used in mining whereby a hole is drilled into the surface of the rock, packed with explosive material, and detonated. The aim of this technique is to induce cracks in the inner geology of the surrounding rock, in order to facilitate further drilling and associated mining activity. The initial hole into which the explosives are packed is known as the “blast hole”. Blast hole drilling is one of the primary surface drilling techniques employed in mining operations today. Blast hole drilling is traditionally used wherever the mining company wants to explore the mineral composition or potential mineral yield of the area demarcated for
What is a non electric shock tube?
Non electric initiation system, NONEL, invented by Per Anders Persson (Nitro Nobel, later Dyno Nobel); introduced to market in 1972.NONEL products can be used with all cast boosters, dynamites and cap-sensitive explosives. Nonel is a shock tube detonator designed to initiate explosions, generally for the purpose of demolition of buildings and for use in the blasting of rock in mines and quarries. Instead of electric wires, a hollow plastic tube delivers the firing impulse to the detonator, making it immune to most of the hazards associated with stray electric current. To meet the ever increasing demand for many minerals, large opencast mines are being planned with high production capacities. To achieve these high production targets, huge explosive quantities are being initiated in a round. As the initiation system influences the blast results, it is necessary to select proper initiation system. Increasing economic pressures environmental constraints and safety mandates in recent years have called for precise focus on drilling and blasting operations in the mining industry. It is generally claimed by the manufacturers that non-electric shock tube system (NONEL)
Why is it important to conduct blasts with safer systems of initiation?
With urbanization and mines getting closer to human habitation, it is important to conduct blasts with safer systems of initiation in order to control ground vibrations and noise with improved Fragmentation. It is generally claimed by the manufacturers that non-electric shock tube system (NONEL) improves over all blasting results. Down the hole initiators initiate the explosive column at a given (bottom) point .A systematic study was taken up to analyse the influence of NONELs on rock fragmentation, ground vibration and noise.
What is Dyno Nobel blasting?
While people often talk about successful blasting solutions as an art and a science, at Dyno Nobel we understand that careful and strategic planning, a high level of experience and expertise, and the ability to choose the highest quality components for the job are important factors. Our blasting experts can help you select the right products and customize a program to help your organization become more profitable.
What is the most widely used detonator?
NONEL® , the original patented nonelectric detonator brand is today's most widely used detonator and eliminates most electric detonator hazards
What is the main objective of explosives inavalanche blasting?
Slope testing, avalanche release, and snow stabilization are the main objectives for using explosives inavalanche blasting. To achieve these objectives, a standard charge is used that is capable of developing deto-nation pressure equal to 1 kg of TNT.
Why use fireline blasting?
Smaller crews may beused to suppress fires because less cutting and/or digging handline is required, particularly in heavy fuels orground cover. Increased speed of building the line can save wildland resources. Sometimes smaller crewsequipped with explosives can be delivered to a fire faster than larger, conventionally equipped crews.Other advantages include:Brush and other debris (fuel and slash) are scattered rather than piled next to the finished line.Mineral soil in the line is loosened and easy to dig for use in hot-spotting; a fine layer of soil dustsfuels close to the line and acts as a retardant.
What happens when a percussion primer is struck by a firing pin?
When the percussion primer is struck by the firing pin of the weapon, the resulting flash ignites a smallcharge of black powder in the primer. The sparks and flame from the black powder ignite the propelling charge.The gases from the propelling charge drive the projectile through the bore of the weapon, where spin is im-parted to the projectile by the engagement of the rotating band with the rifling bore. This spin stabilizes theprojectile in flight. When the fuze functions on the target, the bursting charge detonates with both blast and
How fast does a PETN cord explode?
PETN cord detonates at about 21,000 feet per second at temperatures well below 0 degrees Fahrenheit.Both versions of the explosive cord come packaged in a fiberboard box measuring 20 3/4 inches by 21 1/2inches by 12 inches. Each box contains approximately 100 feet of the seven-strand cord, which weighs about 71pounds, or 175 feet of the four-strand cord, which weighs about 70 pounds.
How long is a fireline explosive?
Fireline explosives are typically a minimum of 50 to 70 feet long, range from 1 1/4 inch to 1 1/2 inch indiameter, and weigh about 60 to 70 pounds when supplied in a cardboard box. Fireline explosives are madeand sold as follows: PETN explosive cord supplied by Ensign-Bickford.
What is the procedure for cornice blasting?
A simple and safe procedure for cornice blasting is to put surface charges of cast or gelatin prim-ers, or the equivalent (ANFO) or slurries) along the estimated tension line of the cornice roof ad-equately .
Is avalanche blasting a static or non-electric?
Even with non-electric blasting caps, avalanche blasting should not be conducted when there is evidence of a strong staticelectricity field (cumulonimbus clouds, electric buzzing).
