INDIAN STANDARD FOR EXPLODERS

7/24/2019 INDIAN STANDARD FOR EXPLODERS

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Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to

information for citizens to secure access to information under the control of public authorities,in order to promote transparency and accountability in the working of every public authority,

and whereas the attached publication of the Bureau of Indian Standards is of particular interest

to the public, particularly disadvantaged communities and those engaged in the pursuit of

education and knowledge, the attached public safety standard is made available to promote the

timely dissemination of this information in an accurate manner to the public.

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( Reaffirmed 2001 )


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IS : 9836 1981

I ndi an St andard

SPECIFICATION FOR EXPLODERS

Electrical Apparatus for Explosive Atmospheres Sectional Committee,

ETDC 22

Chairman

DR G. N. BADAMI

Members

Representing

Central Building Research Institute, Roorkee

SHRI MAHEW CHANDRA Alternate to

Dr G. N. Badami )

SHRI AMLENDU RAY

Food Corporation of India, New Delhi

SHRI V. THIAGARAJAN Alternate )

SHRI . H. BHOJWANI

Bharat Heavy Electricals Ltd, Hyderabad

SHRI S. B. C AGARWAL( Al ternate I )

SHRI G. H. SAHA ( Alternate II )

SHRI S. K. BISWAS GUPTA )

Directorate General of Mines Safety, Dhanbad

SHRI N. K. SEN ( Alternate )

SHRIP. K. CHAKRABOR~Y

Indian Oil Corporation Ltd ( Refineries Division),

New Delhi

SHRI S. KANUN~~ ( Alternate )

Sum S. CHANDRA Macneill Magor Ltd Industries Division,

Calcutta

SHRI A. K. HAZRA ( Alternate )

SHRI B. A. CHEESY

Electronics Commission, New Delhi

SHRI S. G. DEWMUKH

Bharat Bijlee Ltd, Bombay

SHRI P. N. JASUTKAR Alternate )

DIREC-WR ( COMMERCIAL

Central Electricity Authority, Ministry of Energy,

( Department of Power )

DEPUTY DIRECIDR Alternate)

SHRI S. N. GHOSH

The Association of Mining, Electrical and

Mechanical Engineers, U. K., Indian Sub

SHRI S. N. GHOSH

SHRI D. P. GUPTA

SHRI H. N. GUPTA

Branch,. Calcutta

Siemens lndla Ltd. Bombay

Directorate General of Technical Development,

New Delhi

Directorate General Factory Advice Service and

Labour Institutes, Bombay

SHRI G. VAIDYANATHANAlternate )

DR HARIHARSINGH

Directorate of Standardization, Ministry of Defence

(DGI)

( Continued on page 2 )

@ Copyright 1981

INDIAN STANDARDS INSTITUTION

This publication is protected under the Indian Copyright Act ( XIV of 1957 ) and

reproduction in whole or in part by any means except with written permission of the

publisher shall be deemed to be an infringement of copyright under the said Act.


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IS : 9836 1981

Continuedfrom page 1 )

Members

SHRI T. R. A. KRWINAN

Representing

SHRII. M. KHUSHU ( Alternate )

Tariff Advisory Committee, Bombay

SHRI S. LAL

Indian Drugs and Pharmaceuticals Ltd, New Delhi

SHRI G. L. CHAWLA ( Alternate )

SHRIM. M. MEHTA

Tata Consulting Engineers, Bombay

SHRIR. C. BAJPAI ( Alternate )

SHRI 1. N. MURTY

Chief Controllerate of Explosives, Government of

India, Nagpur

SHRI

CHARANJITLAL (

Alternate )

SHRI T. NITYANANDAS.

Loss Prevention Association of India Ltd, Bombay

SHRI S. V. OZARDE

Crompton Greaves Ltd, Bombay

DR

M. S. PADBIDRI

Hindustan Brown Boveri Ltd, Bombay

SHRI N, SUNDARARAXAN

Alternate )

SHRI M. A. J. PARTHASARATHY

Directorate of Standardization, Department of

Defence Production, Ministry of Defence.

( Eng-in-Chief Branch )

MAJ T. R. GULATI ( Alternate )

SHRI S. G. RAMACHANURA Kirloskar Electric Co Ltd, Bangalore

SHRI

T. V. VIUYARATHNARAJ (

Alternate )

SHRI B. RAMACHANDRAN

Larsen Toubro Ltd, Bombay

SHRI I. C. JOSEPH

Alternate )

SHRI K. P. SINGH

National

Hydro-electric Power Corpn Ltd,

New Delhi

SHRI A. N. SRIVATHSA

NGEF Ltd, Bangalore

SHRI S. L. SRIDHARAMURTKV Alternate )

SHRI SURESHKUMAR

The Fertilizer ( Planning Development ) India

Ltd. Sindri

, -~ ~~

SHRI G. S. SINGH (

Alternate >

SHRI R. N. TARAFDAR

Central Mining Research Station ( CSIR ).

Dhanbad

SHRI S. K. RAY ( Alternate )

SHRI M. B. TAWADEY

Coal India Ltd, Ranchi

SHRI A. S. R. MURTHY ( Alternate )

SHRI G. N. THADANI

Engineers India Ltd, New Delhi

SHRI S. KASTHURIRANGAN Alternate )

DR K. S. UPPAL

Explosives Safety Group, Directorate of Arma-

ments. Ministry of Defence I R D )

SHRI R. SRINIVASAN

Alternate )

SHRI S. P. SACHDEV.

Director General, ISI ( Ex-officio

Member )

Director ( Elec tech )

Secretary

SHRI

R. K. MONGA

Deputy Director ( Elec tech ). IS1

( Continued on page 10 )


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IS : 836 - 1981

ndian Standard

SPECIFICATION FOR EXPLODERS

0. FOREWORD

0.1 This Indian Standard was adopted by the Indian Standards Institution on

27 April 1981, after the draft finalized by the Electrical Apparatus for Explo-

sive Atmospheres Sectional Committee had been approved by the Electro-

technical Division Council.

0.2 The exploders or blasting machines are used for blasting operations

in mining and civil works ( non-mining ) areas.

0.3 There are two types of exploders, namely, permitted type and general (or

non-permitted ) type used in the blasting operations.

0.4 The permitted type exploders [see also 3.1 (a) ] are used in under-

ground locations where flammable gas hazard may be present. Such locations

are coal mines, non-coal mines or underground civil works. Such exploders

shall be approved by statutory authority before use. The general type

exploders are used in the open areas where gas hazard may not be present.

0.5 It is essential that the exploder must fire the specified number of deto-

nators in series and/or in parallel in a manner recommended by the manufac-

turer of the exploder and in accordance with stipulations of the statutory

authorities.

0.6 Attention is invited to the fact that the manufacture and use of exploders

in underground coal mines is controlled by the Directorate General of Mines

Safety, Dhanbad.

The testing facility, at present is available in the Central Mining Research

Station, Dhanbad.

0.7 For the purpose of deciding whether a particular requirement of this

standard is complied with, the final value, observed or calculated, expressing

the result of a test, shall be rounded off in accordance with IS : 2-1960*.

The number of significant places retained in the rounded off value should be

the same as that of the specified value in this standard.

1. SCOPE

1.1 This standard covers the requirements of exploders and portable blasting

machines used for electric shot firing operations for activating electro-

*Rules for rounding off numerical values

revised ).

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IS:9836-1981

explosive/pyrotechnic device during mining and non-mining blasting opera-

tions.

2. DEFINITIONS

2.0 For the purpose of this standard, the following definitions shall apply.

2.1 Electra-Explosive/Pyrotechnic Device - A device which uses electrical

energy for activating an explosive/pyrotechnic.

3. CLASSIFICATIONS

3.1 The exploders covered by this standard shall be either of the following

two types:

Permi t t ed Type -

A type which is approved by the statutory

authority namely, Directorate General of Mines Safety, for use in

underground coal, gassy non-coal mines and other hazardous

locations.

General or Non-permi t t ed Ty pe - A type which is used for mining

operations in open places or civil work where the danger from

flammable gases is not present.

4.

CONSTRUCTION AND GENERAL REQUIREMENTS

4.1 The exploder shall be so constructed that all parts are of satisfactory

strength for the service intended. The enclosure case shall be robust such that

meets the requirements of 8.4 and 8.5, splash proof and dust tight ( degree of

protection IP 54) in accordance with IS

:

2147-1962*.

The enclosure of the permitted type exploders shall be so constructed as

not to give rise to ignition hazard of gas and coal dust due to frictional

spark, static charges and leakage current.

4.2 Carrying Strap -

A carrying strap shall be fastened securely to the body

of the exploder.

The carrying strap shall be of adequate strength so as to

withstand an additional 50 percent weight of exploder for 15 minutes with-

out failure or break.

4.3 The operating spindle shall extend through the top or side of the

enclosure and shall be operated by a suitable detachable handle or key.

The protruding portion of the operating spindle

shall be enclosed within-a

*Specification for degrees of protection provided

switchgear and controlgear.

4

by enclosures for low-voltage


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IS : 9836 1981

shouder or a collar so designed that the operatings pindle cannot be opera-

ted without the handle or key. The operating handle shall be proportioned

and dimensioned so as to permit the operator a firm grasp without striking

the knuckles during the twisting or turning movement.

4.4 The output terminals shall be provided with suitable connecting devices

for firm connections. It shall not be possible to remove the connecting device

from its position.

It shall be possible for easy and firm connection of shot

firing cable with the terminals.

4.5 The firing circuit of the exploder shall be adequately insulated from

its enclosure and shall meet the requirements given in 8.1.

4.6 It shall not be possible to remove the handle or key of exploder until this

is brought to oh? position or the completion of firing sequence. The operat-

ing handle or key shall be of special design to avoid the operations by

unauthorised persons.

4.7 The exploder can be so constructed that:

4

b)

It shall be operated by a removeable handle or key,

The firing circuit is made or broken either automatically or by the

operation of handle or key or a push button switch, and

No residual energy is left at the terminals after the completion of

operation sequence.

4.8 The

permitted type exploders shall have suitable devices so as to termi-

nate the output energy pulse within four milliseconds of the operation of

the firing switch/key.

4.9 If the exploder incorporates a circuit testing device for testing the

electrical continuity or resistance of the firing circuit, this device shall comply

with the requirements given in Appendix A.

4.10 Each exploder shall be capable of firing prescribed number of electro-

explosive/pyrotechnic detonators in the manner reco.mmended by the manu-

facturer of the exploder with a total resistance appropriate to that number

of shots.

The performance requirements of the exploder shall be in

accordance with 6.

4.11 In the case of a battery operated exploders, it shall be possible to

replace the battery without disturbing or damaging components or circuit

connections:

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lS:9836- 1981

4.12

The permitted type exploder shall also meet the following require-

ments:

a) The exploder of the capacitor discharge/electronic type, suitable

means shall be provided to ensure automatically that current is put

to line only when the full output potential of the machine has been

attained and also to give a clearly visible indication when the

machine has attained its full output energy.

b) The exploder whose output is directly obtained from a hand

operated generator, suitable means shall be provided to ensure

automatically that current is not put to the line until the speed of

rotation attained by the generator is at least that capable of

producing the output required by 6.2 or otherwise ensuring that the

output is not available until the moment of firing.

c) The exploder whose output is directly obtained from a spring driven

generator, shall be provided with such measure as to ensure auto-

matically that current is not put to line until full energy of the

machine is attained.

4.13 Electrical Connections - All internal electrical connections shall be

mechanically secured or soldered or brazed such that the exploder meets the

requirements of drop test and impact test ( see 8.4 and 8.5 ).

4.14 Open-Circuit Voltage ( Peak ) ( Applicable to Multi-Shot Exploder ) -

The value of maximum or peak open circuit voltage across output terminals

of the exploder is under consideration.

5. MATERIALS

5.1 Materials

- Materials not specifically designated shall be of a good

commercial quality.

6. PERFORMANCE REQUIREMENTS

6.1 The performance of electrical exploders for successful firing of any

particular number of shots connected in series and/or in parallel would

depend on the characteristics of detonators used and the conditions under

which the shots are fired.

6.2 The exploder shall be capable of firing the prescribed number of shots of

detonators in a manner recommended by the manufacturer of the exploder.

6.2.1 The exploder manufacturer shall indicate in the instruction manual,

the total circuit resistance and the rated ac and equivalent dc output

voltage

at that resistance.

6.2.2 In the case of capacitor type exploders, the value of capacitance, the

maximum charged voltage and the external resistance shall be specified in the

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IS : 9836 1981

instruction manual. In addition, the total available energy/ohm/ms from the

exploder may also be specified therein.

6.3 The compliance of the exploder with the requirements of this standard

shall be checked by firing the specified number of detonators in a manner

indicated in the instruction manual. The performance may also be checked

by incorporating suitable external resistance across the output terminals.

7. MARKING

7.1 Each exploder shall be marked with the following information on

its rating plate:

a) Name of the manufacturer;

b) Type of exploder;

c) Rated load resistance;

d) Current in amperes;

e) The rated number of detonators, the exploder would fire in series

and/or in parallel; and

f) Any other marking indicating the approval from the statutory

authority.

7.2 Each exploder shall be provided with an instruction manual giving

necessary operating instructions, illustrations, testing instructions, and safety

precautions to ensure proper operation and maintenance of the exploder.

7.3 The exploder may also be marked with the IS1 Certification Mark.

NOTE

The use of the IS1 Certification Mark is governed bv the provisions of the

Indian Standards Institution (Certification Marks) Act and the Rules and Regulations

made thereunder. The IS1 mark on products covered by an Indian Standard conveys

the assurance that they have been produced to comply with the requirements of that

standard under a well-defined system of inspection, testing and quality control which

is devised and supervised by ISI and operated by the producer. ISI marked products

are also continuously checked by IS1 for conformity to that standard as a further

safeguard Details of conditions, under which a licence for the use of the IS1 Certi-

fication Mark may be granted to manufacturers or processors, may be obtained from

the Indian Standards Institution.

8. TESTS

8.0 AcceptanceTests and the Sampling Plan - The acceptance tests and the

sampling plan for exploders shall be as agreed to between the manu-

facturer and the user.

8.1 Insulation Resistance

Test -

The exploder shall be kept for 24 hours in

the humidity cabinet maintained at 27 f 2C and relative humidity not less

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IS:9836-1981

than 95 percent. The insulation resistance of the exploder after humidity treat-

ment shall be measured by insulation tester with a dc voltage of approximately

500 volts, applied between the line parts and the metal enclosure. The

measurement being made one minute after the application of voltage. The

insulation resistance so measured shall be not less than 50 megohm.

8.2 Dielectric Strength Test - The exploder shall be capable of withstand-

ing the application of high voltage applied for one minute between mutually

insulated circuits and between insulated circuits and external metal parts. The

test voltage is given in the Table 1.

TABLE 1 TEST VOLTAGE

CAPACITYOF EXPLODER TESTVOLTAGE

No. OFSHOTS V rms)

1)

2)

up to 12 200

Over 12 and up to 15 1

Over 15 and to 25

p

J 6

Over 25 nd up to 5 1

Over 5 nd to 100p > 2 500

Over 100 and up to 200 J

After the high voltage test, the exploder shall meet the requirements given

in 6.

8.3

Mechanical Endurance Test

- All exploders shall be capable of with-

standing a minimum of 5 000 actuations at the rate not less than 6 operations

per minute. The exploders after the mechanical endurance test shall comply

with the requirements given in 6.

8.4 Drop Test -

position and

completely assembled exploder shall be held in any

then dropped once from a height of

1

m on to a concrete floor.

This test may be repeated for severe1 positions with separate exploders as

desired by testing authorities before the grant of approval.

8.4.1 After the drop test, the exploder shall be checked for the require-

ments given in 8.5.2.

8.5 Impact Test - The mechanical strength of the enclosure of the exploder

shall be tested by the impact of falling body having a hardened steel hemi-

sphere of 25 mm diameter on the impinging end. The mass of this falling body

shall be 1 kg which shall be dropped vertically from a height of 2 m. The

falling body shall be aimed at the weakest points of enclosure. The exploder

enclosure shall be subjected to this test when placed on a rigid base. After

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IS:9836-1981

the test it shall satisfy the requirements given in 8.5.2 and also the dust

tightness requirements of IP 54 in accordance with IS : 2147-1962*.

8.5.1 The strength of the transparent parts of the exploder shall be tested

by the impact of a falling body having on the impinging end a hemisphere of

25 mm diameter in polyamide ( nylon 6.6 ) rockwell hardness R 100. The mass

of the falling body shall be 1 kg which shall be dropped vertically from a

height of 1 m. The transparent parts are tested when the exploder is placed

on a rigid base.

8.5.2 The impact test and drop test ( 8.4) shall not produce a condition

which invalidates the type of protection of the enclosure of electrical

apparatus. Any deformation caused by these tests shall not prevent the

proper operation of the electrical apparatus nor reduce the creepage and

clearance distances nor the degree of protection of the enclosure.

It is

accepted that the superficial damage, chipping to paint work, breakage of

cooling fans or similar parts of the electrical apparatus and small items shall

be ignored.

APPENDIX A

Cl ause 4.9

REQUIREMENTS FOR CIRCUIT CONTINUITY TESTER

A-O. Before firing the detonators with exploder, it is required to check the

continuity of the firing circuit with a resistance measuring device. It is better

to measure the circuit resistance to be of the order for the particular number

of shots. If the resistance is high and the firing is continued there may be

misfire. To avoid this, there should be a check over the measurement of

continuity and circuit resistance.

A-l. While doing so the testing current in the circuit should be as low as

possible not exceeding 50 mA so that the detonators may not be fired while

checking the continuity of shots. The circuit of the continuity tester shall be

intrinsically safe conforming to IS : 5780-1980t.

A-2. The instrument shall be so designed and constructed as to be incapable

of firing even a single detonator in the circuit.

A-3. The construction and the enclosure of the continuity tester shall meet

the similar requirements as applicable to exploders. ( see 4, 8.4 and 8.5 ).

*Specification

for degrees of protection provided by enclosures for low-voltage

switchgear and controlgear.

tSpecification for intrinsically safe electrical apparatus and circuits (first revision .

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IS:9836-1981

( Continued f rom page 2 )

Panel for Exploders, ETDC 22/P15

onvener

il l1 v. c.

VARMA

Members

Representing

Directorate General of Mines Safety, Dhanbad

SHRI

B. K.

SHARAN Alternate

to

Shri V. C. Varma j

SHRI

J.

ACHARI

SHRI SARAL DAS Alternate)

SHRI S. SESHAN

Central Mining Research Station, Dhanbad

Indian Explosives Ltd. Calcutta

SHRI K. R. KRISHNASWAMY

Alternate )

SHRI R VEDAM

IDL Chemicals Ltd, Hyderabad

SHRI P. V. SATYAVRATANAlternate )

1

INDIAN STANDARD FOR EXPLODERS

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