Explosive Engineering labs

2011-GE-56

CONTENTS

Study the various inert explosives manufactured by Wah Nobel industries, write a short

note on them indicating specifications, their uses etc.

Study the various accessories (inert) manufactured by Wah Nobel and write

.brief note stating their specifications, uses etc.

Study the various inert explosives manufactured by Biafo industries, write a short note

on them indicating specifications, their uses etc.

Study the various accessories (inert) manufactured by Biafo and write a brief note

stating their specifications, uses etc.

Draw the diagram of a blasting cap used in conjunction with safety fuse showing the

explosive train. Also practice the assemblage of blasting cap (inert) and safety fuse

making the proper setting of safety fuse in the cap and cramp it with the help of crimper

at the proper place.

Study a Nonel detonator (inert) and various associated accessories and delays (inert) and

practice its connection in lab.

Practice the recommended knots for detonating cord on inert detonating cord or nylon

strings.

To study the construction and working of Nonel shock tube initiator (actual).

To study the working of different types of electric blasting machines in the lab.

Practice with the help of detonators (inert) and primer (inert) the various proper

techniques in making primers.

How to check the blasting machine energy

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LAB 1

TO STUDY THE VARIOUS INERT EXPLOSIVES MANUFACTURED BY

WAH NOBEL INDUSTRIES, WRITE A SHORT NOTE ON THEM

INDICATING SPECIFICATIONS, THEIR USES

WAH NOBLE EXPLOSIVES:

Emulsion Explosives

Seismic Emulite (E-3):

Seismic emulsion explosives (E-3) meet the highest standard of safety required in rough and

tough conditions of seismic prospecting. E-3 has excellent storage properties especially of high

temperature and humid climate.

Emulite E-3

Technical Data( E-3):

Density 1.25 g/cc

Gas Volume 796 lit. / Kg

V.O.D (unconfined) 5000 - 5400 m/sec

Sensitivity Detonator No. 8

Consistency Emulsion

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Emulite – 150 / Emulite – 150 (G):

This cap sensitive explosive has plastic consistency and is very suitable for achieving high

loading density. It has excellent blasting properties. It can be used as bottom charge for any kind

of blasting. Due to its consistency and high water resistance it can be confidently employed for

deep under water blasting.

Technical Data (E-150):

Density 1.25 g/cc





Technical Data Emulite – 150 (G):

Density 1.25 g/cc





Emulite -100/100 G:

Suitable for pre- spilling, smooth and controlled blasting. In dry and wet bore holes it is also used as a

column charge and ideally suited in the tunnel blasting.

Technical Data Emulite– 100 / 100 (G):

Density 1.20 g/cc




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Technical Data Emulite – 100 (G):

Density 1.20 g/cc





Permissible Emulite E-408:

Emulite-408 is of special composition for use in gassy coal mines. It produces short lived

detonation flames and prevents firedamp or coal dust explosion in underground coal mines

This explosive can be employed in underground mining of other ores as well.

Technical Data Emulite (E-408)

Density 1.12-1.15 g/cc


V.O.D (unconfined) 4400 m/sec



Nitroglycerine Based Dynamite:

Explosives S – 3 (Seismic Explosive):

The severe conditions encountered in oil prospecting demand explosives of a special type. S-

3 the seismic explosive manufactured by Wah Nobel is the best answer to such demands. S-3

has excellent water resistance and capable of withstanding extremely high Hydrostatic

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pressure. It is cartridge in specially designed high density rigid plastic tubes which can be

coupled in to another to make the desired length of column of charge.

Explosive S-3

Technical Data:

Wabox:

Wabox is suitable for all types of rock blasting operations. It is manufactured in a different

grade, namely 80, 60 and 40 percent. These explosives have excellent blasting properties,

highest level of safety in handling and transportation as well as in storage. They are meant

for hard and medium hard rocks and are suitable in dry and wet conditions in quarrying,

striping and underground mining. These explosives give excellent results in under water

blasting as well. All grades of wabox are manufactured according to the requirements of

customers.

Technical Data:






Sensitivity Detonator No.8

Consistency Gelatinous

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V.O.D (unconfined) +5000 m/sec


Consistency Gelatinous

Wabofite:

Wabofite is oxygen - balanced semi gelatinous dynamite. It is employed for pre splitting,

smooth and controlled blasting. It can also be used as a base charge in medium hard and

soft rocks. In dry and wet bore holes it is also used as a column charge in quarrying and it

is ideal for tunneling blasting.

Technical data:



V.O.D (unconfined) +3000 - 3500 m/sec


Consistency Semi Gelatinous

Powder Explosives:

Wabofite

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Wabonite:

Wabonite is a low density explosive of relative high weight strength well suited mainly as

a column charge in all types of rocks where conditions are moderately dry. It is not cap

sensitive explosive and required premier for initiation. Wabonite has excellent storage

properties and offer maximum safety in handling

and transportation.

Technical data:

Wapril (ANFO):

Wapril is a mixture of Ammonium Nitrate and fuel oil having a special sensitizer designed to

give optimum blasting performance. Wapril is a low cost explosive which extensively employed

as column charge in all types of rock blasting operations and is particularly used as a main

charge (with primer) in a large diameter hole blasting.

Density 0.90 g/cc



Sensitivity Primer Required

Consistency Prills

Wabonite

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Wapril

Technical Data:

Density 0.80 g/cc



Sensitivity Primer Required

Consistency Prills

Comments:

In this lab it is clear about the type and the use of an explosive. So if we have the situation then

choosing the proper explosive is not so difficult. Also the best explosive is the emulsion

explosives.

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LAB 2

STUDY THE VARIOUS ACCESSORIES (INERT) MANUFACTURED BY

WAHNOBEL AND WRITE A BRIEF NOTE STATING THEIR

SPECIFICATIONS, USES ETC.

ACCESSORIES BY WAH NOBLE:

Wabocord detonating cord:

Wabocord consist of a core of high explosive contained in polythene and wrapped in various

layers of cottons /jute yarn. The detonating cord is then coated with PVC, giving it a high tensile

strength and making it water proof. The structure of Wabocord assures its efficient field

performance as it is unaffected by both heat and cold within a wide range from - 60 °C to 30 °C

Technical Data:

Safety Fuse:

Safety fuse consist of a central core of specially formulated black power with jute and cotton

countering. Water proofing is done by bitumen, wax as well as PVC. It is designed to propagate

flame to the plain detonators within time limit.

Velocity of detonation 6000-7000 m/sec

Water resistance

Water proof, can

Withstand pressure of 25 meters

water head for 48 hours.

Explosive grammage 10 + 1 g/m

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Safety Fuse

Technical Data:

Burning Time

100-120 m/sec

Suitable for damp and dry

conditions

Coating PVC / Bitumen

Detonator:

Plain detonator No.8:

Standard type Plain Detonator No.8 consists of base charge of high explosive and a primary

charge of an initiating explosive pressed in to an aluminum tube. It is used with safety fuse.

Plain Detonator No.8

Technical Data:

Length of 41mm(Nominal)

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Aluminum casing

Outer Dia. 7mm

Use In combination with

safety fuse

Packing:

100 Detonators packed in a smaller card box. 50 small boxes packed in a master card board box

containing total of 5000 detonators.

Electric Detonator No. 8:

Electrical energy is required to initiate electric detonators. The advantage of electric firing over

firing with safety fuse and plain detonator is that several shot can be connected up and fired

simultaneously with much greater control over the blast.

Electric detonator No.8

Technical Data:

Length of Aluminum

casing

47 mm

Standard wire 3 mtr

Resistance 1.5 - 2.0 ohms

Packing: 10 Detonators packed in a smaller card box. 50 small boxes packed in a master card

box containing of 500 detonators.

P Seismic Detonator:

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Seismic Detonators are specially formulated, high density, high energy detonators for sensitive

seismic explosives. Offering moderate velocity and extraordinarily low gas production, they

improved seismic energy across usable bandwidth for superior final data as well as improved

signal-to-noise ratio.

P Seismic detonator

Technical Data:

Material Aluminum

Length 45 - 45.7 mm

External Dia 7.0 - 7.2 mm

Wire length 4.5, 12,24 and 30 meter

MS/HS Electric Delay Detonators:

Millisecond and half second electric delay detonators are meant to effect delayed blasting action

in multi row bench blasting and tunneling. This action greatly improves blasting results as better

fragmentation and this action greatly improves blasting fragmentation and ground vibration

control is achieved. For surface blasting only, MS delays are used while in underground blasting,

a combination of both MS and HS detonators is employed.

MS/HS Electric delay detonator

LEHER initiation system:

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LEHER is the trade name of the latest “Non-Electric Initiation System (Nonel) developed by

Research and development Laboratories of Wah Nobel.

Advantages:

No stray current or radio transmission hazards.

No side initiation.

No noise problem

Simple and rational connections.

No limits on the size of blast round.

Comments:

Wah Nobel produces a lot of accessories the above are the examples.

LAB 3

TO STUDY THE VARIOUS ACCESSORIES (INERT) MANUFACTURED BY

BIAFO AND WRITE A BRIEF NOTE STATING THEIR SPECIFICATIONS

AND USES ETC.

Biafo Industries Limited is a Pakistani manufacturer and distributor of commercial explosives

and blasting accessories.

PRODUCTS AND THEIR DESCRIPTION:

Tovex Water Gel Explosives:

Tovex, a complete replacement for dynamite, is being accepted by blasting experts throughout

the country and the world because tovex performs equal to or better than dynamite, and it’s much

safer. Tovex super blaster is a cap sensitive cartridge water gel designed for underground and

surface applications. This water gel provides improved performance where a medium to high

strength product is required to do the job.

Tovex Water Gel Exp

Tovex offers improved flexibility in loading

Tovex reduces propagation between holes.

Tovex has reliable water resistance.

Tovex cuts smoke and noxious fumes.

Tovex eliminated nitroglycerin headaches.

Biafo offers complete explosives systems for above and below ground application, where rock

must be broken are:

1. Super Blaster:

Super blaster is a cap sensitive cartridged water gel designed for underground and surface

applications. This water gel provides improved performance where a medium to high strength

product is required to do the job. Tovex super blaster is available in standard diameters from 25

mm to 90 mm.

Super Blaster

Technical Data:

Density 1.25g / cc

V.O.D 16,400 ft./sec (5000 m /sec)

Shelf Life One year from date of manufacture stored at

ambient temperature

Sensitivity Blasting cap# 8

Water

Resistance

Excellent

2. Blaster

Blaster is a cap sensitive cartridge water gel designed for underground and surface applications.

This water gel provides improved performance where a medium to high strength product is

required to do the job. TOVEX® BLASTER is available in standard diameters from 25 mm to

90 mm. BLASTER 200-S is available in 25 mm dia and 200 mm length in hard plastic tubes.

Blaster

Density 1.15g / cc

V.O.D 14,750 ft./sec (4500 m /sec )


ambient temperatures

Water

Resistance

Excellent

Sensitivity Blasting cap#8 strength detonator

3. Super Breaker:

Super breaker is a cap sensitive cartridge water gel designed for underground and surface

applications. This water gel provides improved performance where a medium to high strength

product is required to do the job. Tovex super breaker is available in standard diameters from 25

mm to 90 mm.

Super Breaker

Density 1.1g / cc

V.O.D 12,465 ft./sec (3800 m /sec)

Shelf Life One year from date of manufacture stored

at ambient temperatures

Water Resistance Excellent


4. Breaker:

Breaker is a cap sensitive cartridge water gel designed for underground and surface applications.

This water gel provides improved performance where a medium to high strength product is

required to do the job. TOVEX BREAKER is available in standard diameters from 25 mm to 90

mm.

Breaker

Density 0.90g / cc

V.O.D 10,825 ft/sec (3300 m /sec)





5. Seismic

Seismic explosive has proven a consistently performance, high safety in shot hole explosive that

provides performance equivalent to dynamite with increased safety for seismic prospecting.

Tovex is particularly well suited for sleeper charges because of its resistance to water and to

desensitization under high hydrostatic pressure. Tovex® seismic water gel offers increased

safety to impact, shock and fire and gives high energy level when compared to dynamite.

Seismic Exp

Density 1.28-1.30 gm / cc

V.O.D Greater than 18,045 ft/sec

Shelf Life One year from date of manufacturing stored at


Water

Resistance

Excellent


6. Coal Miner:

Coalminer permissible water gel is multipurpose small diameter cartridge explosive, specially

designed for though loading and shooting conditions in underground coal and rock applications.

Tovex coalminer offers excellent fumes ad smoke control compared to dynamites. Energies

developed are comparable to permissible dynamites, without using nitroglycerine or other

headache-causing ingredients. It is available in standards diameters from 25mm to 32mm.

Coal Miner

7. Powder Explosives

Powder explosives or low density explosives are unique because of their explosives properties as

well as their premier requirement. Ammonium Nitrate is an essential ingredient.

Density 1.13g / cc

V.O.D 14,500 ft/sec (4420 m /sec )

Shelf Life One year from date of manufacture stored at ambient

temperatures


Priming

Requirements

Blasting cap#8 strength detonator

Powder Explosive

Bio Prill

Bio prill is a non- cap sensitive blasting agent blend of granulated ammonium nitrate prills and

fuel oil. It is uniformly mixed and free running. Bio prill is intended for use as column charge for

open cut blasting work.

Bi Bulk

Bi-bulk is a non-cap sensitive blasting agent blend of ammonium nitrate prills, fuel oil,

aluminium and other ingredients. It is uniformly mixed and free running. Presence of Aluminum

in this product produces more heave action resulting in greater rock breakage and movement. Bi-

bulk is used for column charge for open cut blasting work..

Comments:

The Biafo is one the most famous industry in Pakistan that produces many types of explosives

and accessories. The different explosives are given only to the registered industries and persons.

LAB 4

STUDY THE VARIOUS ACCESSORIES (INERT) MANUFACTURED BY

BIAFO AND WRITE A BRIEF NOTE STATING THEIR SPECIFICATIONS,

USES

THEORY:

Accessories:

Accessories are the initiating devices for any blasting operation. Better results can only be

achieved when the initiating devices used to detonate the explosive charge are carefully chosen

and properly utilized.

Biafo offers the following Accessories or initiating devices:

Detonators

Bi Nel

Biafo cord

Safety fuse

1- Detonators:

Plain Detonators:

Plain detonator No.8 is made of Aluminum sheet, lead aside, lead styphnate and Penta erythritol

tetra nitrate (PETN.) Ultrasonic cleaning makes it free from sharp edges, surface defects, grease

and oil, its length is 45 mm and diameter is 6.8 mm and shall perforate completely a 4 mm thick

lead plate. Detonator can be employed to initiate Tovex, dynamite, detonating cord and other cap

sensitive explosives.

Plain Detonator

Electronic Detonators:

Electric detonator No 8 is identical to Plain detonator except that fuse head assembly along with

two copper wires insulated with PVC are attached, its diameter at crimped places is 502mm and

is provided with 3 meter leg wire. It shall not be initiated by a direct current of 0.25 Amps for 30

seconds and shall be initiated by a direct current of 1.0 Amps for 0.01 seconds. All electric

detonators have shunts on the free ends of the leg wires to help protect against unwanted current

flowing through the bridge circuit.

Electric Detonator

Seismic Detonators

Biafo also produced Seismic Detonators for Oil Exploration Companies in different lengths.

2. Bi Nel:

Biafo also produced Non Electric Delay Detonator with different lengths of Shock Tube. In

addition to this we also supply the following

Seismic Detonator

Bi Nel

3. Biafo Cord:

Biafo Cord is a flexible cord containing a centre of high explosive Pentaerythritoltetranitrate

(PETN), which is covered with combination of various yarn and finally with LDPE/PVC

coating. This process protects Biafo cord from extreme temperatures, water, oil or other elements

and provides essential feature as tensile strength, flexibility and other handling characteristics. It

can be initiated by use of a plain or an electric detonator.

Biafo Cord

4. Safety Fuse:

Safety Fuse is a flexible cord containing a centre of Explosive Black Powder which is covered

with combination of various yarns and finally with PVC / LDPE coating. This process protects

Safety fuse from extreme temperature, water, oil or other elements and provides essential feature

of tensile strength, flexibility and other handling characteristics. It can be initiated with hot

object or open flame.

Safety Fuse

omments:C

The accessories above produced by only Biafo and hence they are producing it in high quality for

the use in different fields like in mining purposes etc.

LAB 5

TO DRAW THE DIAGRAM OF BLASTING CAP USED IN CONJUCTION

WITH SAFETY FUSE SHOWING THE EXPLOSIVE TRAIN:

APPARATUS:

Blasting cap

Safety fuse

Crimper

THEORY:

Blasting cap:

The oldest and simplest type of blasting cap, fuse caps are a metal cylinder, closed at one end.

From the open end inwards, there is first an empty space into which a pyrotechnic fuse is

inserted and crimped, then a pyrotechnic ignition mix, a primary explosive and then the main

detonating explosive charge.

Blasting Cap

Safety fuse:

Safety fuse contains a black powder core (potassium nitrate, sulfur and charcoal, 74:16:10)

sheathed by a waxed fiber covering. It does not require air to burn and burns at a rate of 40 ft/sec.

It was invented by William Bickford in 1831.

Safety Fuse

Crimper:

A mechanical device for crimping the metallic shell of a fuse detonator or igniter cord connector

securely to a section of inserted safety fuse. Crimper is also used to safely cut detonating cord,

Nonel and safety fuse.

Crimper

PROCEDURE:

Inspect the blasting cap to insure it is clear of foreign matter.

Cap Inspection

Gently slip the blasting cap over the fuse so that the flash charge in the cap is in contact with

the end of the time fuse. DO NOT FORCE IT IN THE CAP.

After seating the cap, crimp it 3/8 inch from the open end of the cap with the help of a cap

crimper.

Connection of different wellbores

Crimping of cap

Cap and safety fuse connection

PRECAUTIONS:

Point the cap out and away from you when crimping.

Safety fuse should be freshly cut so that there are no chances of misfire.

Safety fuse should besquarely cut while inserted into the cap, otherwise there will be gap

between fuse and ignition mixture causing misfire.

Slanty Cut

Comments:

Precautions should be followed to avoid cut off and to ensure the safety.

Ignition mixture Base Charge

Open End

LAB 6

PRACTICE THE RECOMMENDED KNOTS FOR DETONATING CORD ON

INERT DETONATING CORD OR NYLON STRINGS.

THEORY:

Detonating cord:

Detonating cord (also called detonation cord, detacord, det. cord, detcord, primer cord or sun

cord) is a thin, flexible plastic tube filled with PETN (Pentaerythritoltetranitrate). With the PETN

exploding at a rate of approximately 4 miles per second, any common length of det. cord appears

to explode instantaneously. It is a high-speed fuse which explodes, rather than burns, and is

suitable for detonating high explosives. The velocity of detonation is sufficient to use it for

synchronizing multiple charges to detonate almost simultaneously even if the charges are placed

at different distances from the point of initiation. It is used to reliably and inexpensively chains

together multiple explosive charges. Typical uses include mining, drilling & demolition.

Types of detonating cords:

They are of different types depending upon amount of PETN present in it. They may be of

400 grains/foot

4 grains/foot

Connecting safety fuses

Types of Knotting:

There are three basic types of knotting the detonating cord and nonel or detonating cord with a

detonating cord;

Half Hitch Knotting

Double Wrap Half Hitch Knotting

Square Knotting

Half Hitch Knotting:

This is done between trunk line and down line of blasting pattern. The junction should make the

two lines tight and perpendicular to each other.

Half hitch Knot

Double wrap half hitch knotting

This is again done between trunk line and down line but it gives more grips to junction of two

lines.

DOUBLE Wrap Half Hitch

Square knotting:

Usually this is done between open end of trunk and down line to complete the circuit (spread).

Square knotting

PROCEDURE:

Half Hitch Knotting:

Keep the trunk line tight and make a half hitch knot of down line. The knot should be tight and

two lines should be perpendicular to each other after knotting.

Double wrap half hitch knotting:

It is similar to half hitch knot the only difference is that before knotting the down line is wrapped

twice on trunk line. It provides extra strength.

Square knotting:

A square knot is formed by tying a left-handed overhand knot and then a right-handed overhand

knot, or vice versa. A common mnemonic for this procedure is "right over left, left over right".

The working ends of the square knot must emerge both at the top or both at the bottom.

PRECAUTIONS:

In delay pattern, knotting should be done in such a way that it avoids cut-off as shown in

figure.

Knotting procedure

Comments:

Angle between down line and trunk line should 90oafter knot is .

Knot should be tight that no misfire occurs.

Reference:

Montana Department of state Lands Blaster Certification Training Manual

LAB 7

TO STUDY THE CONSTRUCTION AND WORKING OF NONEL SHOCK

TUBE INITIATOR

APPARATUS:

Nonel shock tube initiator, shock tube and shot shell primer.

Nonel Shock Tube Initiator

THEORY:

Nonel:

Nonel (Shock tube) is a thin hollow plastic tube with a light dusting of HMX-AL mixture

(powder) on the inner wall. The powder is held to the inside of the tube by electrostatic charges

when it is blown into the tube during manufacture. One pound of explosive mixture coats 70,000

ft of tube. It has a V.O.D of 6500 ft/sec. due to light loading of explosive there is no rupturing of

the tube. This property of the tube makes it safe to handle and also reduces air blast when used as

trunk line.

Nonel

Shock tube initiator:

In this shot shell primer is used to initiate the Nonel. The Explosive in shoot shell primer is a

primary explosive (i.e. Lead Azide or mercury fulminate) which are initiated by giving a sharp

below to it, which initiate the powder mixture of shock tube.

Electric initiation:

Nonel can be initiated by using electric initiation system. Electric nonel initiators use plasma or

spark technology to ignite the Nonel tubing.

PROCEDURE:

Unscrew the coupling.

Insert shot shell primer into the threaded end of the coupling.

Screw the coupling back into the housing.

Insert shock tube into the angled hole in the coupling from the top

Pull the shock tube through the angle hole and then insert the shock tube into the center hole

in the coupling

To fire hit the black cushion sharply with the palm of the hand.

Comments:

Electric blasting is a good technique used and gives more safety than other type.

Precautions:

Keep hands and fingers away from the firing opening to avoid burns or whiplash from the

shock tube.

Electric Initiation

LAB 8

TO STUDY THE WORKING OF DIFFERENT TYPES OF ELECTRIC

BLASTING MACHINES IN THE LAB

THEORY:

There are two basic types of blasting machines

Generator blasting machine

CD machine

Sequential Blasting machine

Generator blasting machine:

This machine is operated manually; when handle is pushed down a series of gears spins a rotor

inside the generator assembly producing voltage. When handle reaches the end of its travel, it

closes a switch which delivers the current produced to the output terminals of machine. This

current initiates the circuit.

Generator Blasting Machine

CD machine:

CD machine is basically a capacitor discharge system. It is an electronic circuit in which a series

of capacitor are fully charged using battery; a firing switch discharges the energy through the

blasting circuit connected to it.

CD Blasting Machine

Sequential Blasting machine:

A special class of CD blasting is sequential timing blasing machine which consist of a no. of

separate capacitor circuits and output terminals each capable of firing a series of electronic

detonators. These separate firing circuits discharge their energy at predetermined time interval.

Sequential Blasting Machine

Comments:

Voltage from manual machine is depended upon the condition of machine and strength of

operator.

Capacitance of capacitor decreases with time

LAB 9

STUDY A NONEL DETONATOR (INERT) AND VARIOUS ASSOCIATED

ACCESSORIES AND DELAYS (INERT) AND PRACTICE ITS CONNECTION

IN LAB

APPARATUS:

Nonel (shock tube)

Nonel detonator

lead-in line

Bunch Connector

J-hook

Block connector

THEORY:

Nonel (Shock tube):

Shock tube is a thin hollow plastic tube with a HMX-AL (powder) on the inner wall. The powder

is held to the inside of the tube by electrostatic charges when it is blown into the tube during

manufacture. It has a V.O.D of 6500 ft/sec. Nonel was invented by Dyno Nobel's Swedish

organization in the 1960s and 1970s

Nonel Detonator:

In Nonel a column of hot gases is traveled which removes the explosive from the walls and

propagates towards detonator. This flash has enough energy to initiate the pyro-technique charge

which further detonates the detonator.

Nonel Detonator

Down-hole detonator:

It employs both a primary charge and a base charge to provide the strength necessary to detonate

modern explosives. Lead Azide is the primary charge; its shape allows it to be fully encapsulated

by the base charge, which generally consists of PETN or polycoated PETN.

Surface detonator:

It does not require as much strength;utilize a simple Lead Azide explosive charge.

Lead-in line:

Nonel tube which is used to move away from site to the safe place during blast is called lead-in

line. Lead Line consists of a 2500 ft. spool of shock tube.

Lead in line

Bunch Connector:

The simplest way to hook up a NONEL is by using bunch connectors. The bunch connector is a

connector unit that is used to initiate a number of NONEL-tubes that have been gathered into a

bunch. The technique is used primarily in tunnel blasting.

Bunch Connector

Downhole Detonator

J-Hook:

It is usually used to connect the Nonel in down line and detonating cord as trunk line.

MS Delay Connectors:

These are used to provide the surface delays for detonating cord trunkline. In this a piece of

Nonel in between the two bunch block provides delay for detonating cord.

Bunch Block J- Hook

Precautions:

Keep hands and fingers away from the firing opening to avoid burns or whiplash from the

shock tube.

Comments:

J-hook provides only one way of detonation

MS Delay connector provides two way detonations

LAB10

INTRODUCTION TO LIGHTNING STORM DETECTOR

LIGHTNING STORM DETECTOR:

INTRODUCTION:

The SD-250 is a unique, state of the art electronic storm warning system which satisfies the

requirements of The Bureau of Mines, O.S.H.A., and the U.S. Army Corps of Engineers. It

reduces exposure to and potential hazard for people who are outside such as blasters,

construction and mining crews, window cleaners, airport and marina personnel, golfers and

swimmers, or anyone who needs advanced warning of approaching electrical storms. The SD-

250 provides this advanced warning by detecting the electric discharges of lightning with a

custom amplified receiver and is sensitive enough to detect strikes as far as 100 miles away. A

speaker function is built in to allow the user to monitor background noise when setting up the

unit to minimize interference from external devices. Proximity of electrical discharges can be

monitored as the distance of lightning strikes are indicated by the range lamps and an alarm can

be set to go off should the storm come closer than the distance set by the operator. When tripped

a built in "squawking" alarm sounds and twin lamps alternately flash until reset by the operator.

The system can also be configured to activate a variety of external warning devices such as

sirens, strobe lamps, transmitters, computer interfaces, etc. The system comes complete in a

watertight case with a smart battery charger and a system testing generator.

Lightning Storm Detector

TECHNICAL SPECIFICATIONS:

Dual Indicators Built in flashing lights and alarm speaker.

Range Indicators 10, 25, 50, and 100 miles ( switch selectable )

Sensitivity: one microvolt

Size 8”x 8”x 6.5”

Weight 14 lbs

Battery Rechargeable 6 volt GC-660 ( smart charger

supplied with unit )

Date post:	09-Feb-2017
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