Precision Drilling &
Frequently Asked Questions
Dykon Blasting has received hundreds of emails asking various
questions about the demolition and/or blasting industry. In an effort to make information
easier to obtain, we shall post the most frequent questions that have been asked
with the best answers that we can provide.
We at Dykon wish to thank everyone for the
phone calls and emails we have received. We try to answer each of them personally but as always, time does
not often permit us to do so.
Where do you receive formal training for
you get a job with Dykon?
does an implosion work?
Why do you have to blast rock?
blasting is done near my property, what keeps my home or my well from being
damaged from ground vibration?
determines the safe levels of ground vibrations for blasters to follow?
How do you
measure the ground vibration and airblast?
you know the amount of explosive that can be used without causing any damage
due to ground vibration?
To our knowledge, there is no formal training available for
demolition blasting. Experience can only be obtained by employment
directly with a firm which specializes in demolition blasting.
Demolition blasting companies usually train their employees
The explosive industry has a very large presence in world
economy and has many different facets that influence things to differing
degrees. Explosive demolition accounts for a tiny percentage of the
whole picture. In comparison to drilling blasting contractors who
specialize in rock removal, explosive demolition contractors are few and
far between. It's not feasible for a university to prepare a study
course and train people on a full scale basis to fill such a tiny niche in
the market place.
On the other hand, there is formal training available for
those who wish to gain knowledge of explosives in general. A good
working knowledge of explosives, safety, and the laws regarding their
storage and use is a perfect place to begin a career in their use. A
list of links to some of these schools is published directly
|Training on explosive use and safety can also be obtained
from Bradley Safety Consultants. The president of BSC is Mickey
Bradley and his school handles explosive training and licensing for the
states of Arkansas and Oklahoma.
Mickey Bradley can be reached at 918-465-3405 or you can email
him at firstname.lastname@example.org
Dykon currently has 14 drills in their fleet. We
provide Drilling and/or Blasting services for quarries, mines and
construction projects requiring rock removal. As our business
grows and expands in this area, we will be needing qualified, dependable
people to operate these drills.
We always have our eyes open for qualified project
managers in the explosive demolition field.
Anyone interested in employment with Dykon should
expect hard work, extensive traveling, and time away from home.
Interested individuals can fax your résumés to
(918)-592-5277, or email us at email@example.com
As always, we appreciate your interest. A
world of thanks from us to you.
Not all demolition blast (s) are implosions. The
industry often refers to them as implosions because it is a popular
expression. A true implosion is a case when a structure has been
caused to fall inwards on itself. Smokestacks, towers, bridges and
most buildings are not imploded. They are simply knocked over.
Implosion is used when there is limited area on all
sides of a structure making it impossible to lay them out.
The principles used on an implosion are basically the
same whether it is a true implosion, or if the structure is simply going
to be laid out. The principle tool in an implosion is gravity.
The explosives are used to weaken and cause the supporting members of the
structure to fail, thus allowing gravity to pull the structure down or
If you have a four-legged table and you remove two legs
from one side, the table will fall over. You can control the
direction of fall by choosing which two legs to remove. A large
building generally has many legs, or columns, that support it. In an
implosion, you remove the columns from within the building first, thus
causing the initial collapse to start from that point. The resulting
collapse of the inner columns first, help drag the structure down towards
Blasting is usually the most cost effective way to break rock.
This helps to reduce your costs for coal, building materials, utilities,
or any other product which comes from rocks or minerals.
Lower costs encourage more expansion and more jobs. The tax
dollars that you spend go towards roads, civil improvements, utilities all
of which are usually funded by government money.
Our lives as we know them today would not be possible without the
use of explosives.
Federal, state, and sometimes, local governments impose limits on the
level of vibration and noise produced from blasting.
It takes a lot of energy to break rock. Energy in a blast
which is not used for rock breakage is wasted in the form of ground
vibration and airblast. The use of explosives is the use of
energy. Energy is not cheap in any form. Look at the
price of a gallon of energy on any gas pump. It takes about 2 tons
of natural gas to manufacture 1 ton of ammonium nitrate blasting
Ground vibration is controlled by limiting the amount of energy
released into the rock at a time. The energy is distributed through
the rock to be blasted in the form of holes drilled into the rock.
The holes are detonated in a progressive sequence that resembles slices of
bread being removed from a loaf. One slice is removed to make room
for the next slice, and so on. By controlling the number of holes
detonated at one time, you control the amount of energy released as
well. This energy decays with distance from the shot.
By knowing the distance to the closest structure you wish to
protect, you can calculate the amount of energy that can be released into
the ground at any one delay period without causing any damage due to
It would be an exhaustive process to describe in detail, all the
steps that are taken to protect the property of people surrounding a blast
site. When blasting near people's homes and property, the entire
blast is designed to protect that property from excessive ground vibration
and flyrock. There are volumes of books dealing with this topic and
the legal limits as well. Interested parties can find these
publishings, for sale, at the web site of the International
Society of Explosive Engineers.
There has been an extensive amount of research done to determine the
safe levels of vibrations. The purpose being to establish a level
for blasters to operate under that will eliminate the risk to properties
surrounding a blast site.
The United States Bureau of Mines has contributed a major part of
the technical data on blast design and vibration control. Other
agencies and institutions have provided a great deal of research that has
contributed to the accumulated knowledge in this field. You can
visit the website of the Office
of Surface Mining, (OSM) in the website of the department of the
interior for more information.
Current legal and recommended vibration limits have resulted from
this research. By staying below these limits and following safe
blasting procedures, the risk to property around the blast site can be
minimized or eliminated.
The Office of Surface Mining, (OSM),
publishes their findings on this subject in reports called "Reports
of Information." Abstracts from some of the reports that deal
directly with ground vibration and airblast are as follows:
This information is made available by the International
Society of Explosive Engineers and is publicly available from their
website at www.isee.org.
Point your browsers towards their technical
By using a device called a seismograph. These instruments are
capable of recording the amplitude of ground vibrations produced from a
blast. The readings can be sent to an independent firm who
specialize in analysis of seismograph data.
Before a seismograph is approved for field work, it is tested and
calibrated by the manufacturer/supplier. After that, the
seismograph is re-tested & re-calibrated once a year to assure that is
is operating within specs. Also, the seismograph is capable of a
self diagnostic which the blaster can use each time the seismograph is
deployed. This self test tells the blaster that the unit is
Explosives are energy in a different form than others.
Electricians know how to calculate the amount of energy it would require
to start and run motors and lights and other electrical components.
Car manufacturers can calculate the mileage one should expect, or hope, to
get from a vehicle before it is purchased. After you purchase
a car, you then gain historical knowledge based on how much mileage your
car actually gets. So after a while, you know how much gas you
better have in your gas tank before you set off on a trip. And after
a few months of utility bills, you know how much it will take to run the
electrical appliances around you.
Gasoline, natural gas, propane and electricity are the most common
forms of energy made available to everybody for everyday use. People
who manufacture products that consume this energy also know how to
calculate it's efficiency.
Blasters know how to calculate the efficiency of the energy they
use. By using only the amount of energy it takes to perform the job
at hand, one can be assured that there isn't enough left over to cause any
ground vibration damage to property outside the blast site.
It would be unreasonable to think that a single gallon of gasoline
could propel your car across several counties and back again, without
running out. It would be unreasonable to think that you could run
your home with a single kilowatt of electrical energy for a
Each individual electrical appliance in your home uses a different
quantity of power. This is based on it's size and workload.
Your air conditioner or heater is going to require more electricity than a
light bulb in a lamp would need. A big truck will use more fuel per
mile than compact car if everything is running efficiently.
Different kinds of rock require different amounts of energy in the
fracturing process. Blaster's must take all the properties of the
geology into consideration when designing a blast round.
The United States Bureau of Mines adopted a mathematical formula
that blasters can use when designing a blast, that when followed, will
assure the blaster that there is not enough energy being released at any
one time to cause damage to the closest structure. A blaster who is
not using a seismograph is required to use this mathematical formula in
designing what we call the "Maximum Pounds per Delay" of
explosives used. The mathematical formula used, is known as the
"Scaled Distance Formula." This formula, when used, is
conservative to the point that it assures there will not be enough energy
released into the rock at any one delay period to cause ground vibration
damage to a well or structure.
A blasting operator who does not routinely use seismographs to
record the actual ground vibration must adhere to the "Scaled
Distance Formula" to design the "Maximum Pounds Per Delay"
for his blast.
Do you have a question for us? Email it to firstname.lastname@example.org