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Detonating Cord
The Explosives Division of GULF OIL Corporation Limited
manufactures PETN Detonating Cords of different core loads
for use in opencast metal and coal mines, quarrying, civil
construction, and for stoping in underground metal mines.
Detonating cords are reliable, have a high breaking load and
good abrasion resistance.
Detonating Cord, also known as Detonating Fuse, is a flexible
cord containing an explosive core of Penta Erythritol Tetra
Nitrate (PETN) encapsulated using polymeric tape, natural or
synthetic yarns and over-extruded with PVC to provide
abrasion resistance and water proofness. They can be set-off
using a No.6 strength detonator and upon initiation, reliably
sets off cap-sensitive explosives lying in contact with it.
Detonating Cord is used as downlines (in-hole) and as surface
trunklines. They reliably transmit detonation through
recommended type of knots. However, care should be taken
to ensure that acute angles are avoided when connecting
detonating cord through knots. The main line and branch line
should preferably be at right angles in order to prevent cutoffs
due to high brisance generated upon detonation.
The PVC coating on the detonating cord provides good water
proofing and abrasion resistance. Care, however should be
taken not to cause any damage to the cord during usage.
Detonating Cords are manufactured having different core loads
(quantity of PETN per meter length of cord) for different applications
and the details are as under:
|
D-Cord
I |
D-Cord
II |
D-Cord
III |
D-Cord
IV |
| Core Load (g/m) |
6.5 ± 0.5 |
9.5 ± 0.5 |
20.0 ± 2.0 |
40 ± 2.0 |
| Nominal diameter (mm) |
4.0 ± 0.15 |
4.6 ± 0.15 |
6.0 ± 0.15 |
8.0 ± 0.20 |
Weight of cord / meter
(g/m) |
17.0 ± 1.0 |
21.0 ± 1.0 |
35.0.0 ± 2.0 |
70.0 ± 2.0 |
Velocity of Detonation
(m/sec) |
6750 ± 250 |
6750 ± 250 |
6750 ± 250 |
6750 ± 250 |
| Colour |
Yellow |
Orange/Pink |
Red |
White |
| Application |
As surface trunkline, downline in shallow drillholes, secondary blasting |
As downlines and trunklines |
As downlines under tough conditions and deep boreholes |
For presplitting and seismic prospecting work |
For Export market, D Cord-I with 5 and 6 g/m
and D Cord-II with 10 and 12 g/m core load are
also offered.
|
D-Cord
I |
D-Cord
II |
| Core Load (g/m) |
5.5 ± 0.5 |
12.0 ± 1.5 |
| Nominal diameter (mm) |
3.9 ± 0.15 |
4.8 ± 0.15 |
Weight of cord / meter
(g/m) |
16.0 ± 1.0 |
23.0 ± 1.0 |
Velocity of Detonation
(m/sec) |
6750 ± 250 |
6750 ± 250 |
| Colour |
Yellow |
Pink |
| Application |
As surface trunkline,
downline in
shallow drillholes,
secondary
blasting |
As downlines
and trunklines |
Detonating cords, manufactured for special applications are also
available, details as under:
|
D-Cord
80 |
C-Cord |
L-Cord II |
G-Cord |
| Core Load (g/m) |
80 ± 3.0 |
8.5 ± 0.5 |
3.8 ± 0.30 |
4.5 ± 1.50 |
| Nominal diameter (mm) |
12.0 ± 0.25 |
4.4 ± 0.5 |
3.6 ± 0.15 |
3.8 ± 0.15 |
Weight of cord / meter
(gms/m) |
130.0 ± 4.0 |
19.5 ± 1.0 |
12.0 ± 1.0 |
13.0 ± 1.0 |
Velocity of Detonation
(m/sec) |
6750 ± 250 |
6750 ± 250 |
6750 ± 250 |
6750 ± 250 |
| Colour |
Parrot Green |
Dark Green |
Blue |
Light Green |
| Application |
Pre-splitting & seismic prospecting work |
As downlines and trunklines in Limestone quarries |
Dimension stone industry for primary & secondary splitting |
Underground coalmines for Gallery Blasting |
Packaging
Detonating Cord is wound onto reels and placed inside a polythene cover.
The reels are placed inside a corrugated fiber board case. Markings on the
case indicate product name, grammage of cord, quantity, case number,
date of manufacture, net weight and gross weight.
|
PETN
quantity
per meter
(grams))) |
Quantity
per reel
(meters) |
No. of reels
& Quantity
per case (meters) |
Net
Weight (kg) |
Gross
Weight (kg) |
| L-CORD II |
3.6 |
500 |
4 / 1500 |
24 |
29 |
| D-CORD I |
5
6 |
500
500 |
4 / 1500
4 / 1500 |
31
33 |
36
38 |
| C-CORD |
8.5 |
375 |
4 / 1500 |
30 |
35 |
| D-CORD II |
10
10
10
12 |
250
250
375
250 |
4 / 1000
6 / 1500
4 / 1500 |
22
33
31
23 |
27
38
36
28 |
| D-CORD III |
20 |
150 |
4 / 600 |
21 |
26 |
| D-CORD IV |
40 |
100 |
4 / 600 |
27 |
32 |
| D CORD 80 |
80 |
50 |
4 / 600 |
28 |
33 |
| G-CORD |
4 |
500 |
4 / 2000 |
27 |
32 |
Initiating Detonating Cord
For initiating detonating cord,
firmly tape the detonator onto
it using electrician’s tape as
shown in sketch. The business
end of the detonator should
point towards the direction in
which the detonating cord
should detonate.
Attaching detonator onto
Cord |
Detonating Cord Connections
Recommended methods of extending the cord and
connecting downlines to trunklines:
 |
 |
| Square knot used for
connecting two lengths of
cord |
Clove Hitch |
 |
 |
| Double Wrap Half Hitch |
Using plastic connector |
 CE (Conformité Européenne) Mark is approved
for the following Detonating Cord products:
- D Cord - I (5 & 6 g/m)
- D Cord - II (10 & 12 g/m)
- D Cord - III (20 g/m)
- D Cord - IV (40 g/m)
- D Cord - 80 (80 g/m)
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Statutory Classification and Shipping Information
|
Plastic Coated |
Textile Braided |
Petroleum & Explosives
Safety Organization
(PESO), Government of
India |
Class 6
Division 2 |
Class 6
Division 2 |
| IMDG Classification: |
|
|
| Class |
1 |
1 |
| Division |
1.1 |
1.1 |
| Group |
D |
D |
| U.N Number |
0065 |
0063 |
| Page Number |
1251 |
1251 |
| Stowage Category |
I |
I |
Precautions
- Do NOT allow detonating cord to get contaminated
with oil or chemicals.
- Do NOT subject detonating cord to impact, friction,
heat or fire.
- Always use a sharp knife to cut detonating cord. Never
use scissors or serrated edges to cut detonating cord.
- Do NOT attempt to cut detonating cord by impacting it
between two hard surfaces such as stone, metallic
objects such as hammer, rod, axe etc.
- Use proper knots to make connections and avoid acute
angles during hook-up.
- Do NOT allow loops, kinks, cross-overs to form when
using detonating cord to avoid cut-offs.
- Do NOT carry out charging of explosives during an
approaching storm or when there is lightning activity in
the blast area. Vacate the blast area and resume
operations only after the storm has passed.
- Do NOT attempt to fight explosive fires.
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