detonating cord union
A shockwave driven reaction at a velocity great than the speed of sound in the medium.
A detonator is a device used to trigger an explosive device. Detonators can be chemically, mechanically, or electrically initiated, the latter two being the most common.
Detonator (or cap) Sensitive
A term applied to any explosive which can be reliably initiated in the unconfined state by a number 8 detonator.
A blast hole which has had water removed using an in-hole pump or other mechanical means.
Typical dewatering truck fitted with submersible pump.
Direct supervision is a term that is used to refer to situations in which a supervisor is present at all times. The supervisor oversees activities as they occur and provides constant direction, feedback, and assistance. For some types of workplaces, direct supervision is required for safety and health reasons.
A test for direct supervision is that the supervisor is constantly aware of what the supervised person is doing and is able to immediately communicate direction (such as Stop That Now!!)
Direction of Movement
The preferred direction in which the blasted rock mass moves under influence of the blast – at right angles to the ‘angle of initiation’.
A form of misfire in which some explosive is left undetonated as a result of an adjacent explosion, eg. separation of charge by ground movement or severance of the initiating line.
One of the six divisions into which explosives are subdivided as follows:
Division 1.1 Explosives - Substances and articles which have a mass explosion hazard (a mass explosion is one which affects almost the entire load virtually instantaneously).
Division 1.2 Substances and articles which have a projection hazard but not a mass explosion hazard.
Division 1.3 Substances and articles which have a fire hazard and either a minor blast hazard or a minor projection hazard, or both, but not a mass explosion hazard.
Division 1.4 Substances and articles which present no significant hazard.
Division 1.5 Explosives - Very insensitive substances which have a mass explosion hazard. This division comprises substances which have a mass explosion hazard but are so insensitive that there is very little probability of initiation or transition from burning to detonation under normal conditions of transport.
Division 1.6 Articles containing extremely insensitive explosives.
NOTE: For a complete evaluation of these divisions see AS 1216.
Division 5.1 Oxidisers - Substances which, while not combustible, may by readily liberating oxygen, cause or contribute to the combustion of other material, and have been classified as Class 5.1 by the appropriate regulatory authority. These substances would be expected to fail the UN test for determining whether a material is a Class 1 explosive.
Hazard Division and Compatibility Group are the key descriptors used for storage and transport classification.
The following are typical for commercial explosives
In terms of explosives and blasting:
The 'donor' is the first part of the Donor-Receptor relationship that delivers energy to the receptor.
The key factor of the donor is the amount of energy provided. This may be measured in terms of equivalent mass of TNT.
The 'receptor' is the second part of the Donor-Receptor' relationship that accepts energy from the donor and, if sensitive enough, will then detonate.
On detonation the receptor becomes the donor to the next part of the explosives chain.
The Donor-Receptor relationship may be summarised as:
For reliable propagation the output of the donor must exceed the sensitivity of the receptor.
The Donor-Receptor relationship is key to understanding propagation and failures.
These units of competency are recommended for current Drill and Blast Engineers, Superintendents, Supervisors and Senior Shotfirers wishing to increase both their design and management skills.
Course assessment is by completion of classroom and online components and by assignment submission.
Class size is limited to eight persons on a first come basis.
Course leader is Peter Duniam BE. MPM. Director of Blast Management International with over thirty years industry experience.
5 DAY COURSE
MAY 11-15, 2020
$2,900 per person includes lunch each day, 500 page colour manual and statement of attainment for the completed competencies.
ENQUIRIES & BOOKINGS
Phone (07) 3348 5144
0409 001 186
Note this class is not suitable for persons without comprehensive drill and blast experience in either an engineering or operational role.