IS 15143 (2002): Conveyor Belting of Elastomeric and Steel ...conveyor belting.This standard will be...

41
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. इंटरनेट मानक !ान $ एक न’ भारत का +नम-णSatyanarayan Gangaram Pitroda “Invent a New India Using Knowledge” प0रा1 को छोड न’ 5 तरफJawaharlal Nehru “Step Out From the Old to the New” जान1 का अ+धकार, जी1 का अ+धकारMazdoor Kisan Shakti Sangathan “The Right to Information, The Right to Live” !ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह Bharthari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 15143 (2002): Conveyor Belting of Elastomeric and Steel Cord Construction for Underground Mines and Such Other Hazardous Applications [PGD 31: Bolts, Nuts and Fasteners Accessories]

Transcript of IS 15143 (2002): Conveyor Belting of Elastomeric and Steel ...conveyor belting.This standard will be...

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.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 15143 (2002): Conveyor Belting of Elastomeric and SteelCord Construction for Underground Mines and Such OtherHazardous Applications [PGD 31: Bolts, Nuts and FastenersAccessories]

Is 15143:2002

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IndianStandard

CONVEYOR BELTING OF ELASTOMERIC AND STEELCORD CONSTRUCTION FOR UNDERGROUND

MINES AND SUCH OTHER HAZARDOUSAPPLICATIONS —SPECIFICATION

IICS 53.040.20; 73.100.01

,!

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[“ ;p ;

0 BIS 2002

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

I September 2002i Price Group 12

Pulleys and Belts Sectional Committee, BP 29

FOREWORD

This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Pulleys andBelts Sectional Committee had been approved by the Basic and Production Engineering Division Counci 1.

A standard on specification for conveyor belting of elastomeric and steel cord construction for undergroundmines and such other hazardous application was felt necessary to give satisfactory quality of this special purposeconveyor belting.This standard will be useful for application under hazardous conditions, such as, in undergroundmines application and in places subjected to fire hazards.

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 or analysis, shall be rounded off in accordance with1S2: 1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retained in therounded off value should be the same as that of the specified value in this standard.

.

.

IS 15143:2002

Indian Standard

CONVEYOR BELTING OF ELASTOMERIC AND STEELCORD CONSTRUCTION FOR UNDERGROUND

MINES AND SUCH OTHER HAZARDOUSAPPLICATIONS — SPECIFICATION

1 SCOPE

This standard covers the requirement for fire resistantconveyor belting made from tire resistant elastomericcompounds and steel cord reinforcement for use inunderground mines and such other hazardousapplications where risk of fire is involved.

2 REFERENCES

2.1 The following Indian Standards contain provisionswhich through reference in this text, constituteprovisions of this standard. At the time of publication,the additions indicated were valid. All standards aresubject to revision, and parties to agreement based onthis standard are encouraged to investigate the possi-bility of applying the most recent editions of thestandards indicated below:

and the user, the width of the belting shall at no pointvary from the nominal width by more than the givenin Table 1.

Table 1 Tolerance on Belt WidthAlldimensionsinmillimetres.

(Clause 3.2.1)

Nominal Maximum Nominal MaximumBelt Width Tolerance Belt Width Tolerance

800 +8 1500 ● 12900 *9 1600 * 12

1000 & 10 1800 i 141050 i 10 2000 ● 141200 *11 2200 ● 15

1350 * 12 2400 * 15

1400 & 12 2.500 * 15

IS No.3400

(Part 1): 1987

(Part 2): 1995(Part 3): 1987

TitleMethods of test for vulcanizedrubbers:Tensile stress-strain properties(second revision)Hardness (second revision)Abrasion resistance using a rotatingcylindrical drum device ($irstrevision)

3 DIMENSIONS

3.1 Length

The length of belt and tolerance thereon shall be inaccordance with the following requirements:

,a)

i

b)

The length of belt shall be free from factorymade splices.

NOTE — This requirement may be waived by the

purchaser so that a single splice is permitted.

There shall be no negative tolerance on beltmanufactured to a length specified by thepurchaser.

NOTE — Wheremultiplerollsaresuppliedfor use on a

given conveyor, the ‘no negative’ tolerance applies only

to the overall length.

3.2 Width

3.2.1 Tolerance on Belt Width

Unless otherwise agreed to between the manufacturer

1

3.2.2 Edge Width Free of Cord

At each edge of the belting the distance between theedge and the outer surface of the outer cord shall benot less than 15 mm and not more than 50 mm fromedge of belting.

3.3 Thickness of Belt and Covers

Specified nominal = Nominal top cover thicknessbelt thickness + Nominal bottom cover

thickness + Nominal corddiameter.

3.3.1 The methods of measuring belt thickness andcover thickness shall be in accordance with Annex Aand Annex B, respectively.

3.3.2 Tolerance on Total BeIt Thickness

For belt thickness <20 mm is + 10 percent–1.Omm

For belt thickness 220 mm is + 10 percent–1.5mm

The difference between any two of the measurementstaken shall not exceed 10 percent of the mean beltthickness.

3.3.3 Cover Thickness

3.3.3.1 The cover thickness at any one point is thedistance from the outer surface of the cord to thesurface of the belt. The specified cover thickness shal Iinclude any transverse reinforcement. The mean cover

..

Is 15143:2002

thickness shall be within –1.0 mm and +1.5 mm ofthe specified nominal cover thickness.

3.3.3.2 Where visual examination of vertical cordposition indicates the necessity of measuring coverthickness above or below several individual cords, thisshall be carried out, using a steel ruler graduated in0.5 mm or a depth gauge but ignoring any local surfaceunevenness (for example, brands). The cover thicknessabove or below any cord shall not vary from meancover thickness by more than + 1.5 mm.

4 GENERAL REQUIREMENTS

4.1 Construction

The belting shall primarily consist of one layer oflongitudinal steel cords embedded in fire resistantcompounds. Additional transverse reinforcements maybe included. The whole belt shall be cured orvulcanized together in accordance with the bestmanufacturing practice. The belt edges shall becompletely sealed against ingress of moisture by fireresistant compounds. Suggested parameters ofconveyor belting are given in Table 2.

,4.2 Steel Cord

4.2.1 The cords shall consist of wire ropes, constructedto withstand the effects of flexing during the life ofbelting. The tolerance on the chosen diameter of thecords shall be as given in Table 3.

4.2.2 The method of determining cord diameter shallbe in accordance with Annex C.

4.2.3 The wires of the raw cord shall be protectedagainst corrosion during transport, storage and coated,if necessary, to provide the required adhesion.

4.3 Belt Data

4.3.1 The following data shall be specified by thesupplier when either applying or tendering for aspecific application:

a)

b)

c)

d)

Minimum belt strength in kN/m,

Nominal belt thickness and nominal coverthickness in mm,

Nominal cord diameter in mm and cordconstructions,

Minimum cord strength in kN,

Table 2 Designation and Suggested Parameters of Conveyor Belting ofElastomeric and Steel Cord Construction

(Clause 4.1)

Belting Steel Cord NumberDesigna- Beltingtion Reinforcement Belt Width, mm

Cord Cord 600 650 750 800 850 1000 1050 1200 1400 1500 1600 18002000220025003000 3500Break- Pitch,

ing mm

Force,MinkN

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20)

ST 500 7.3 13.8 42 45 52 56 63 70 74 84 99 106 113 128 142 156 178 215 219

ST 560 8.2 13.8 42 45 52 56 63 70 74 84 99 106 113 128 142 156 178 215 219ST 630 9.3 13.8 42 45 52 56 63 70 74 84 99 106 113 128 142 156 178 215 219ST710 10,3 13.8 42 45 52 56 63 70 74 84 99 106 113 128 142 156 178 215 219ST 800 11.6 13.8 42 45 52 56 63 70 74 84 99 106 113 128 142 156 178 215 219

ST 900 14.7 15.3 37 40 47 50 56 63 66 76 89 96 102 115 128 141 161 193 207ST 1000 16.5 15.3 37 40 47 50 56 63 66 76 89 96 102 115 128 141 161 193 207ST 1120 18.5 15.3 37 40 47 50 56 63 66 76 89 96 102 115 128 141 161 193 207ST 1250 20.6 15.3 37 40 47 50 56 63 66 76 89 96 102 115 128 141 161 193 207ST 1400 23.1 15.3 37 40 47 50 56 63 66 76 89 96 102 115 128 141 161 193 207

ST 1600 29.1 17.3 33 36 42 45 50 56 59 67 79 85 90 102 113 124 142 171 183ST 1800 32.7 17,3 33 36 42 45 50 56 59 67 79 85 90 102 113 124 142 171 183ST 2000 36.4 17.3 33 36 42 45 50 56 59 67 79 85 90 102 113 124 142 171 183ST 2240 41.0 17.3 33 36 42 45 50 56 59 67 79 85 90 102 113 124 142 171 183

ST2400 51.1 19.4 30 32 37 40 45 50 52 60 70 75 81 91 101 111 127 152 163ST 2600 57.1 19.4 30 32 37 40 45 50 52 60 70 75 81 91 101 111 127 152 163ST 3150 64.6 19.4 30 32 37 40 45 50 52 60 70 75 81 91 101 111 127 152 163

ST 3550 72.8 19.4 30 32 37 40 45 50 52 60 70 75 81 91 101 111 127 152 163ST 4000 82.0 19.4 30 32 37 40 45 50 52 60 70 75 81 91 101 111 127 152 163ST 4500 92.3 19.4 30 32 37 40 45 50 52 60 70 75 81 91 101 111 127 152 163ST5000 102,0 19,4 — — — — 45 50 52 60 713 75 81 91 101 111 127 152 163ST 5500 113.5 19.4 — — — — 45 50 52 60 70 75 81 91 101 Ill 127 152 163ST 6000 133.0 20.0 — — — — 43 48 50 58 68 73 78 88 98 108 123 148 158

2

.

e) Nominal cord pitch in mm, and

t) Nominal belt width in mm and number ofcords.

Table 3 Tolerance on Cord Diameter

(Clause 4.2. 1)

Cord Diameter Tolerance

mm Percent

<3.35 +6, –1

23.35 to <6.30 +5, –1

>6.30 +4, –1

4.4 Cord Pitch

4.4.1 Cords should be evenly spaced across the widthof the belting. When belting is tested in accordancewith the method given in Annex D, the tolerance onany individual cord pitch compared to the average cordpitch shall be + 1.5 mm, except that 5 percent of thecords may exceed this tolerance by not more than 10percent of the mean spacing.

4.4.2 In addition, no part of the outer cords shall beless than 15 mm or greater than 50 mm from the edgeof the belting and the variation in the edge rubberthickness shall be not more than 10 mm on any oneedge.

4.5 Joints in Cord

Cord joints shall be avoided as far as possible. In anylength of finished belting, the number of individualspliced cord joints permitted shall be as follows:

a) Not more than one joint in any one cord,

b) Not more than one-cord joint per 10 m ofbelting,

c) Not more than one-cord joint in beltscontaining up to 50 cords,

d) Not more than two-cord joints in beltscontaining 51 to 100 cords, and

e) Not more than three-cord joints in beltscontaining over 100 cords.

4.6 Spliced Joints

4.6.1 Approval

For fire resistant conveyor beking, the strength of thespliced joints, the splicing procedure and the splicingmaterials shall be as per the agreement between theuser and the manufacturer,

4.6.2 Conditions of Supply

Where necessary, two lengths of finished belting maybe joined with a spliced joint to make up an individuallength as specified by the purchaser (see 3.1), subjectto the following conditions:

a)

b)

c)

Is 15143:2002

For lengths less than 50 m, no spliced jointsshall be permitted;

For lengths over 50 m, not more than onespliced joint shall be permitted. Where aspliced joint is permitted it shall be not lessthan 20 m from either end; and

The manufacture shall noti~ the user of theposition in the belt length of any spliced jointmade during manufacturing.

5 WORKMANSHIP AND FINISH

5.1 Freedom from Defects

The surface of finished belting shall be free fromblisters, pitting or other major surface flaws and shallbe completely sealed against ingress of moisture.

6 SAMPLING

6.1 Selection of the Test Samples

If a manufacturer submit a sample to the testinglaboratory (for example, DGMS etc) for type test or tocheck the requirements as per the specification, thesample may, at the option of the testing laboratory beselected by the manufacturer. When tests are beingperformed or witnessed by the testing laboratory as acheck that normal supplies are in compliance withthis specification, the sample shall be selected by thetesting laboratory. A sample shall not be tested lessthan 48 h after completion of manufacture.

6.2 Length of Sample

6.2.1 For Belting of 1600 kN/m Width and Above

For belting with top and bottom covers which areidentical, the overall length of the sample shall be13.0 m. To facilitate handling/transportation, thesample may be supplied, subject to agreement betweenthe manufacturer and the testing laboratory in thefollowing pre-cut lengths:

a) Two pieces, 4.0 m long x 1050 mm wide forhigh energy propane burner tests; and

b) One piece 5.0 m long x full belt width forthe remaining tests.

If required by the testing laboratory, belting shall besupplied as pre-cut test pieces of specified dimensionsand quantity.

For belting with top and bottom cover which are notidentical, the overall length of the sample shal I be17.0 m. As in above, the sample may be supplied inthe following pre-cut lengths.

a) Three pieces 4.0 m long x 1 050 mm widefor the high energy propane burner tests.

b) One piece 5.0 m long x full belt width forthe remaining tests.

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IS 15143:2002

1f requested by the testing laboratory, belting shall besupplied as pre-cut test pieces of specified dimensionsand quantity.

6.2.2 For Belting Below 1600 kN/m Width

For belting with top and bottom covers which areidentical, the overall length of the sample shall be9 m. To facilitate handling/transpot-tation, the samplemay be supplied in the following pre-cut lengths,subject to agreement between the manufacturer andthe testing laboratory:

a) Two pieces 2.0 m long x 900 mm wide forthe low energy propane burner tests; and

b) One piece 5.0 m long x full belt width forthe remaining tests.

If requested by the testing laboratory, belting shall besupplied as pre-cut test pieces of specified dimensionsand quantity.

For beking with top and bottom covers which are notidentical, the overall length of the sample shall be 11.0m. As in above, the sample may be supplied in thefollowing pre-cut lengths.

a) Three pieces 2.0 m long x 900 mm wide forthe low. energy propane burner tests.

b) One piece 5.0 m long x full belt width forthe remaining tests.

If requested by the testing laboratory, beking shall besupplied as pre-cut test pieces of specified dimensionsand quantity.

7 QUALITY CONTROL SYSTEM AND TESTS

Manufacturers shall establish and maintain a qualitycontrol system. The system shall ensure that themanufactured products meet the requirements of thisspecification.

7.1 Tensile Strength of Belt and Cords

7.1.1 The breaking strength of the belt shall becalculated from the breaking strength of the cords.The measured cord strength shall not be less than theminimum cord strength as given in Table 2.

Belt strength = Cord strength (kN) x No. of cords

Belt width (m)

Unit of belt strength is kN/m of belt width.

7.1.2 The testing for cord strength shall be carriedout on either of the following:

a) Embedded cord (in accordance with themethod given in Annex E), and

b) Unprocessed cord (subject to agreementbetween supplier and user).

4

7.2.1 Cord Pull-Out Strength

When tested in accordance with the method given inAnnex F, the minimum allowable cord pull-outstrength shaIl be calculated in kN/m of cord length asfollows :

a) For belts of 1 600 kN/m width and above,(8d + 38) kN/m of cord length,

b) For belts below 1600 kN/m width,(16d) kN/m of cord length,

where d is the nominal cord diameter in mm.

7.2.2 Cover Adhesion

The mean adhesion strength between cover and bonderlayer shall not be less than 10 kN/m width, when testedin accordance with the method given in Annex G.

7.3 Cover Compound Properties

The belt cover shall be tested for the followingproperties in accordance with the method given inAnnex H :

Tensile strength 16 MPa, Min

Elongation at break 350 percent, Min

Hardness’) 70+ 5 IRHD (or equivalent)

Abrasion resistance 200 mm3, Ma

NOTE — With ageing the characteristics ofcover compound can

change.

7.4 Troughability

When tested in accordance with the method given inAnnex J, minimum troughablity value shal I be asspecified in Table 4 for the appropriate trough ingangle.

Table 4 Troughability

Troughability Angle, Degrees Troughability, Mirs

(1) (2)s 20 0.05

>20 s25 0.07>25 <30 0.09>30 <35 0.11>35 <40 0,14>40 <45 0.17>45 <50 0.21

>50 <55 0,23

7.5 Electrical Resistance

Electrical resistance shall be measured in accordancewith the method given in Annex K and the averagevalue on both the upper and lower surface of the belting

1)The equivalent shore A vaiue k 70°.

shall be not greater than 3x 10*C?.This figure shallalso represent a maximum during the working life ofthe belt.

t7.6 Fire Test Requirements

I 7.6.1 Drum Friction Test

a)

b)

The belting shall be tested by the methoddescribed in Annex L and there shall be noflame or glow on any part of any one of thetest pieces during or after each test.

Temperature measurements of the surface of

I

the drum taken during each test shall notexceed 325”C.

7.6.2 Spirit Burner Flame Test

The belting shall be tested by the method described inAnnex M. When the belting is tested in accordancewith Annex M, the average duration of the visibleflame shall not exceed 3 s and the average duration ofthe visible afterglow shall not exceed 10 s, for bothlongitudinal and transverse direction. The durationof the visible flame of any test piece shall not exceed10 s and the duration of the visible afterglow of anytest piece shall not exceed 15 s.

7.6.3 The High Energv Propane Burner Tests

Steel cord belts shall be tested by the high energypropane burner test method given in Annex N for beltsof 1 600 kN/m width and above.

7.6.3.1 Acceptance criteria

When tested in accordance with the method given inAnnex N the belt shall meet one of the followingrequirements in each test run :

a)

b)

c)1

The length of belting remaining undamagedover its full width (N-8) shall be greater than2250 mm.

The maximum average temperature rise(N-9) shall not exceed 90”C, the length ofbelting consumed (N-1O) shall not exceed2000 mm and the length of belting remainingundamaged over its full width (N-8) shallexceed 250 mm.

The maximum average temperature rise(N-9) shall not exceed 80”C, the length ofbelting consumed (N-1 O) shall not exceed2250 mm and the length of belting remainingundamaged over its full width (N-8) shallexceed 250 mm.

If none of the above acceptance criteria have been metthe belt sample be reported as having failed to complywith the requirement of the specification. In the event

I of test run being terminated prematurely (N-7.2) the

Is 15143:2002

results recorded up to the time of termination shal I bereported.

7.6.4 Low Ener~ Propane Burner Test

Steel cord belts shall be tested by low energy propaneburner test method given in Annex P for belts below1600 kN/m width.

7.6.4.1 Acceptance criteria

When tested in accordance with the method given inAnnex P the belting shall be self-extinguishing, afterthe propane flame has been removed, all combustionshall cease and a minimum of 250 mm long full widthportion on each test piece shall remain undamaged atthe completion of the test.

7.7 Tracking

When running on correctly aligned customerconveyor equipment and after due efforts have beenmade to align the belting centrally on the equipment,the belting shall not move sideways at any point onthe equipment by more than the values as given inTable 5.

Table 5 Tracking Values

Size (Width in mm) Values

(1) (2)

UP to 800 Not more than *40 mm

Above 800 up to I 600 Not more than + 5 percent 01’

the belting width

Above 1600 Not more than *80 mm

7.8 Dynamic Cord Pull-Out Fatigue Resistance

When tested in accordance with the method given inAnnex Q, using a cyclic load range between 3.6 and36 percent of the nominal static pull out for a givencord diameter, there shall be no evidence of cord pullout after completion of 10000 cycles.

8 MARKING

8.1 Belting shall be permanently marked usingcharacters 20 to 50 mm high. Each group of markingshall be parallel to the belt edge and shall include thefollowing information:

a)

b)

c)

d)

Designation of the belting (Table 2);

Grade of the belting in accordance with theapproval number of the statutory authority,where applicable;

Thickness of the top cover followed by thethickness of the bottom cover expressed inmm (see 3.3.2);

The approval number of regulatory authority,where applicable to the grade of belting;

5

.-s!.-1s 15143:2002

e) Manufacturer’s serial number;

f) Yearofmanufacture;

g) Manufacturer’s identification or trade-mark;and

h) Progressive station numbers.

Example

The following shows a

Designation

Belt grade forundergroundapplication

Cover thickness

Approval number

Serial number

Year of manufacture

Manufacturer

Progressive station

The marking shall be on one edge only, at intervals of dnot more than 5 m, approximately 100 mm from and ...,,fparallel to the belt edge (see Fig. 1). ,.#

NOTE— Manufacturers making a statement of compliance with

this standard on a product, packaging or promotional material

related to that product are advised to ensure that such compliance 4

,,.,,

is capable of being verified.

marking scheme in the sequence required:

IS 15143ST800 FR-U 96 XYZ 10033 01 MFG. CODE

--l

8.2 BIS Certification Marking

8.2.1 Belting may also be marked with the StandardMark.

8.2.2 The use of the Standard Mark is governed bythe provisions of the Bureau of Indian StandardsAct, 1986 and the Rules and Regulations madethereunder. The details of conditions under which thelicence for the use of the Standard Mark may be

100 1

granted to manufacturers or producers maybe obtainedfrom the Bureau of Indian Standards.

9 STORAGE AND HANDLING

Conveyor beking shall be stored under conditions thatdo not adversely affect the properties of the belting.Conveyor belting shall be handled during transit andin storage in such a manner as to avoid damage to thebelting and not create a hazard.

1

5000+,-

:1s 15f43 ST 600 M96 )W2 10033 94 BELIEX 1 tsJ5f4a ST aoo M96 m 10033 94 BELTEX 1

All dimensions in mill imetres.

FIG. 1 MARKINGOFBELTING

>

.

6

IS 15143:2002

ANNEX A

(Clause 3.3.1)

METHOD FOR DETERMINING THICKNESS OF BELTING ACROSS THE BELT WIDTH

A-1 SCOPE

This Annex sets out a method for determining thethickness of conveyor belting across the belting width.

A-2 PRINCIPLE

The thickness of belting at each of five specified pointsis determined by using a micrometer dial gauge. Themean thickness and the variation in thickness as apercentage of the mean is then determined.

A-3 APPARATUS

A measuring instrument consisting of a micrometerdial gauge firmly held in a rigid stand over a flat base/plate of at least 50 mm diameter, is required. The gaugeshall have a scale graduated in unit divisions of0.02 mm. The plunger shall be fitted with a flat circularcontact of 10.0 mm to 12.0 mm diameter which issquare to the plunger and parallel to the baseplate.The dial gauge shall operate under a deadweight loadequivalent to a pressure on the test piece of 20.0 kPa.

A-4 TEST SPECIMEN

A 150 mm test piece of the belting shall be cut acrossthe fill width of the belting, at right angles to its edgeand square to its surface. The test piece shall be markedas detailed in Fig. 2.

A-5 PROCEDURE

The thickness of the belting at or near each of fivemain points shall be measured when the test piece islaid flat, and the mean thickness shall be determined.

A-6 REPORT

The report shall include the following information:

a)

b)

c)

The thickness of the belting at each of thefive points and the mean thickness, to thenearest 0.1 mm;

The variation in thickness as a percentage ofthe mean thickness; and

Reference to this Annex, that isIS 15143, Annex A.

150BELT WIOTH (W)

1 r -1 ----

All dimensions in millimetres.

FIG. 2 MEASUREMENTOFTHICKNESS

7

1s 15143:2002

ANNEX B

(Clause 3.3. 1)

METHOD FOR DETERMINING COVER THICKNESS

B-1 SCOPE

This Annex sets out a method for determining thecover thickness of conveyor belting.

B-2 PRINCIPLE

The distance from the flat surface of each cover to thenearest edge of the nearest cord adjacent to a numberof points is measured and the thickness of each coveris calculated.

B-3 APPARATUS

B-3.1 Rigid Clamp — For holding the test pieceagainst a smooth flat surface.

B-3.2 Vernier Height Gauge — With graduation of0.02 mm.

B-4 TEST SPECIMEN

A 150 mm test piece of the belting shall be cut acrossthe fuIl width of the belting, at right angles to its edge,and square to its surface.

B-5 PROCEDURE

The procedure shall be as follows:

a) Coat the square end of the test piece with one

b)

c)

where

a

b

h

d

coat of water based paint and allow to dry;

Clamp the test piece with one surface againstthe smooth flat surface; and

Measure the distance a in mm from the flatsurface to the nearest edge of the nearest cordadjacent to the eight points as indicated inFig. 3 and calculate the following details:

In Cover A, a = mean of eight measurementstaken

In Cover B, b=h–a–d

= thickness of Cover A in mm,

= thickness of Cover B in mm,

= mean thickness of the belting [see A-6(a)]in mm, and

= cord diameter in mm.

B-6 REPORT

The report shall include the following information:

a) Cover thickness — Thickness of Cover A andCover B to the nearest 0.1 mm.

b) A reference to this Annex, that is IS 15143,Annex B.

d- max.

a 4

FIG. 3 COVERTHICKNESS

!!

Is 15143:2002

ANNEX C

(Clause 4.2.2)

METHOD FOR DETERMINING CORD DIAMETER

C-1 SCOPE

This Annex sets out the method for determining corddiameter.

C-2 PRINCIPLE

The cord diameter is measured with a calliper.

C-3 APPARATUS

A calliper, fitted with a dial gauge, or vernier scalecapable of measuring to within 0.01 mm, is required.The calliper is fitted with jaws broad enough to covernot less than two adjacent strands along the cord.

C-4 PROCEDURE

The procedure shall be as follows:

a) Measure the diameter of the cord with the

b)

calliper, on a straight portion of the cordunder no tension (see Fig. 4).

Take measurements at two points spaces atleast 1 m apart, and measure the twodiameters at right angles at each point.

NOTE — The average of this four measurements should be

within the tolerance specified by reference to the nominal

diameter. The maximum variation between any of the four

measurements should not exceed 4 percent of the nom intll

cord diameter.

C-5 REPORT

The report shall include the following information:

a) The cord diameter in mm; and

b) A reference to this Annex, that is IS 15143,Annex C.

------

*,!’,,

w

FIG. 4 APPARATUSFORMEASURINGCORDDIAMETER

9

A—

Is 15143:2002

ANNEX D

(Clause 4.4.1)

METHOD FOR DETERMINING CORD PITCH

a,,D-1 SCOPE

This Annex sets out a method for determining theaverage cord pitch and deviations ti-om this value.

D-2 PRINCIPLE

Measurements are made of the distance between thetwo outer cords and adjacent cords. From thecalculated average cord pitch, the location andmagnitude of deviations in the case of individualadjacent cord pitches are determined.

D-3 APPARATUS

D-3.1 Suitably Graduated Steel Measuring Tape —With length greater than the belting width.

D-3.2 Steel Rule — Graduated in 0.5 mm or less.

D-3.3 Pair of Dividers or Vernier Callipers

D-4 TEST PIECE

A test piece not less than 150 mm long shall be cutacross the full width of the belting, at right angles toits edge and square to its surface.

D-5 PROCEDURE

The procedure shall be as follows:

a)

b)

Measure the distance between the left-hand*.$

1,,,.

sides of the two outer cords (see Fig. 5). iUsing the steel rule and dividers or verniercallipers similarly measure individual cordpitches.

D-6 CALCULATION

The average cord pitch shall be calculated using thefollowing equation:

Average cord pitch =Distance between the outer cords

No. of cords – 1

D-7 REPORT

The report shall include the following information:

a) The distance between outer cords;

b) Average cord pitch;

c) Location of any cord pitches which differfrom the average pitch by more than 1.5 mmand the amount by which they differ; and

d) Reference to this Annex, that is

IS 15143, Annex D.

SPACING OF OUTER CORDS

Iboooo oooobl

FIG. 5 DISTANCEBETWEENTHELEFT-HANDSIDESOFTHETwo OUTERCORDS.

10

IS 15143:2002

ANNEX E

(Clause 7.1 .2)

METHOD FOR DETERMINING CORD BREAKING

E-1 SCOPE

This Annex sets out a method for determining thebreaking force of the cord component of cnveyorbelting.

E-2 PRINCIPLE

Test pieces are subjected to a steady controlled rate ofstrain in a tensile testing machine until the point ofbreak, and the force at this point is measured.

E-3 APPARATUS

A suitable tensile testing machine, which is capableof exerting a steady rate of strain without interruptionand of measuring the test force with an error of notmore than 2 percent is required. The rate of separationof the jaws of the tensile testing machine shall be25 + 2.5 mm/min.

E-4 TEST PIECE

Three test pieces shall

FORCE

be taken from the belt sampleand prepared as shown in Fig. 6. Each test piece shallcontain five cords. The length of the test piece (L, )shall be a minimum of 1500 mm. (A longer test piecemay be found necessary on high strength beltsdepending on the jaw and grip design of the tensi Ietesting machine.) The four outer cords shall beremoved over a distance of 100 mm together with thesurrounding rubber material, leaving one cord intactin the centre of the test piece.

To ensure satisfactory gripping on the jaws of a tensi Ietesting machine the thickness of the top and bottomcover at both ends of the test piece may be reduced(see Fig. 6). The length of cover reduced shall dependon the grips used. Sufficient thickness of rubber shallbe retained to prevent the jaws making contact withthe steel cords.

S’rAt4DARD @ ~cr)mw GRIPIF REQUIRED

-----

= 100 =-

L1.

All dimensions.in millimetres.

FIG. 6 TESTPIECEFORTENSILESTRENGTHOF STEELCORD

11

Is 15143:2002

E-5 PROCEDURE

The test piece shall be held in the test machine gripsso that the five cords are secured and the inner endsof the grips are approximately 200 mm apart at thestart of the test. Three test pieces shall be tensile testedto destruction and the maximum breaking force foreach test piece recorded. The mode of failure and thestrand breakage pattern shall also be recorded.

If the jaws fail to hold the cord under test, one or moreof the following may be required:

a) a longer test piece,

b) additional jaws (see Fig, 6),

c) heavier jaws, and

d) special jaws.

E-6 REPORT

The report shall include the following information:

a) The maximum breaking force for each of thethree tests shall be recorded in kN. Theaverage of the three recorded breaking forcevalues shall be calculated and recorded, thisshall be termed as the cord strength.

b) Reference to this Annex, that is IS 15143Annex E.

ANNEX F

(Clause 7.2.1)

METHOD FOR DETERMINING CORD PULL-OUT STRENGTH

F-1 SCOPE

This Annex sets out a method for determining thestrength required to pull cords from the carcass ofconveyor belting.

F-2 PRINCIPLE

The force required to extract cords from a unit lengthof belting is determined by the application of a steady,controlled rate of strain using a tensile testing machine.

F-3 APPARATUS

Suitable tensile testing machine capable of exertingsteady rates of strain without interruption and ofmeasuring the test force with an error of not morethan + 2 percent. The rate of separation of the jaws ofthe tensile testing machine shall be 100 + 10 mm/min.

F-4 TEST PIECE

Three test pieces shall be cut from a full thicknesssection of the belting containing five cords. Test piecesshall be cut to the arrangement shown in Fig. 7. The

12

test length (Ll) shall be 50 + 2 mm for belting below1600 kN/m width and above.

F-5 PROCEDURE

Mount each test piece centrally in the jaws of thetensile testing machine and operate the machine unt iIfailure occurs.

F-6 CALCULATION

The unit pull out strength for each test piece shal I becalculated from the following equation:

Unit pull-out Pull-out force (kN) x 1000—strength (kN/m) – Measured test length L, (mm)

F-7 REPORT

The report shall include the following information:

a) Average pull-out strength of the three testpieces, kN/m; and

b) Reference of this Annex, that isIS 15143, Annex F.

.

Is 15143:2002

TEST LENGTH (L1 )

1= #———-——————““’’’’’’’’’W=Q

= 20 50 20 =1%, 1

I 500 I

VIEW OF CENTRE CORD UNDER TEST

OUTER CORDS CUT THROUGH LEAVING ONLYCENTRE CORD INTACT

7

alf—————-——.—__———_——

~II—————-—-————————A_ —

———- —-—— —___

———— ————— ____ ——— ——

———_ __ ———____ __ — _ _ _ —— _——— ——_ —— — — — - ___ _ _ _ _

5 CORDS——— —— _

—— ——— ! — - — — —____ - _ _ _—— ——---— --——______ _ _ _ —— ——— ——

——— -—— —— — — —— — — — ——- _ _—. ———— —-—.—————— ———_ __ ———-— ——

—— ——— ——— - — — -——— —— — -—- ——

FIG.

&NTRE CORD cm

Alldimensionsin millimetres.

7 TESTPIECEFORCORDPULL-OUTSTRENGTH

,.-----

.B

ANNEX G

(Clause 7.2.2)

METHOD FOR DETERMINING ADHESION BETWEEN COVER AND BONDER LAYER}4

G-1 SCOPE autographic recorder is required. The machine shal I

This Annex sets out a method for determining the be capable of exerting a steady rate of strain without!! adhesion between the cord bonder and the cover rubber

interruption and of measuring the test force with an

(laminate).error of not more than + 2 percent. The rate ofseparation of the jaws of the tensile testing machine

G-2 PRINCIPLE shall’be 100 + 10 mm/min.

The stripping force required to separate laminations G-4 TEST PIECEis measured by means of a suitable tensile testingmachine having an autographic recorder.

Three test pieces 150 mm long and at least 25 mmwide and containing not less than two cords, shal I be

G-3 APPARATUS cut fkom the belt. The laminate to be tested shall be

A suitable tensile testing machine having ancut from the plane of the adhering surface to enable itto be stripped from the belt in the testing machine.

13

1s 15143:2002

G-5 PROCEDURE

The procedure for each test piece shall be as follows:

a) Cut back the laminate at an angle ofapproximately 30° to the surface so that itcan be gripped in one jaw and the remainderof the belt can be gripped in the other jaw.

b) Mount the test piece in the tensile testingmachine and strip the laminate from the beltwith the force being continuously recorded.From the recording, determine the average

stripping force of the test piece and divide bythe width of the test piece.

G-6 REPORT

The report shall include the following information :

a) The average stripping force in kN/m for eachof the test pieces and the location of theseparation.

b) Reference of this Annex, that is IS 15143,Annex G.

ANNEX H

(C/ause 7.3)

METHOD FOR DETERMINATION OF TENSILE STRENGTH, ELONGATIONAT BREAK, HARDNESS AND ABRASION RESISTANCE OF COVER RUBBER

H-1 SCOPE

This Annex sets out a method for determining thetensile strength, elongation, hardness and abrasionresistance of covers of conveyor belting.

H-2 PRINCIPLE

The method of test shall be adopted as given for dumb-bell test pieces type 1 in IS 3400 (Part 1), for hardnesstest pieces in IS 3400 (Part 2) and for abrasionresistance test pieces in IS 3400 (Part 3).

H-3 PROCEDURE

The test pieces shall be prepared and conditioned asdescribed in IS 3400 (Part 1), 1S 3400 (Part 2) andIS 3400 (Part 3). The ‘testtemperature of27 + 2°C.

H-4 REPORT

The following informationcover:

a) The total number

. .shall be carried out at a

shall be reported for each

of test pieces, tested and

b)

c)

d)

e)

f)

14

the reason for rejecting any test pieces or testresult obtained.

The mean value of the tensile strength of threepieces successfully tested and the value ofthe individual tests.

The mean value of the elongation of the threetest pieces successfully tested and the valueof the individual tests.

Report hardness as the nearest whole numberAnd as the median of three or fivemeasurements in International RubberHardness degrees.

The report of abrasion resistance shall includethe following particulars :

.,----

1) The relative volume loss.

2) Any deviation from this standard,specially use of only half of the abrasiondistance.

Reference to this Annex, that is IS 15143,Annex H.

@_

IS 15143:2002

ANNEX J

(Clause 7.4)

METHOD FOR DETERMINING TROUGHABILITY

J-1 SCOPE

This Annex sets out a method for determining thetroughability of conveyor belting.

J-2 APPLICATION

This method is applicable only to belting having aminimum width of 500 mm.

J-3 PRINCIPLE

A test piece is supported at the edges in such a way asto minimize all friction and end forces. Thetroughability is determined by measuring thedeflection of the belting at the centre of the test pieceand is expressed as the ratio of the deflection to theflat width of the belting.

J-4 APPARATUS

The test apparatus shall consist of the followingequipment (see Fig. 8):

a)

b)

Two rigid horizontal bars convenientlysupported over a base. The unsupportedlength of the bars shall be greater than thewidth of the belting being tested.

Two clamps 150 mm long for attaching to

500 mml

the ends of the test piece, provided withsuspension logs for attachment to thesuspending wires. The clamps shall besufficiently rigid to maintain the width of thetest piece free from curvature and shall exertno bending moment which might influencethe deflection of the test piece.

,J.A----

LINE

TEST Pl~

FIG. 8 APPARATUSFORMEASURINGTROUGHABILITY

15

1s 15143:2002

c) Fourrelatively inextensible suspension wires,fitted with adjustables stirrups on each endfor attaching to horizontal bars and clamps.

NOTE — It is important that the suspension length of each

wire is the same although the actual length is not so important.

Also his essential that the attachments to the horizontal bars

and clamps reduce friction forces to a minimum when

maintaining the suspension wires vertical during the test.

d) Means of measuring the deflection of the testpiece.

J-5 TEST PIECE

A test piece 150 mm wide shall be cut out from thefull thickness of the belting including covers at rightangles to the length of the belting. The length of the

,test piece shall be the till width of the belting.

J-6 CONDITIONING OF TEST PIECE

The belting shall be tested not less than 3 days aftermanufacture, during which period the test piece maybe prepared and conditioned. Before testing it shallbe conditioned at a standard temperature of 27 + 2°Cfor 16 h, during which period it shall be maintainedin a flat condition so as to remove residual curvature.

J-7 PROCEDURE

After conditioning, test pieces shall be tested asfollows :

a)

b)

c)

where

F

L

Fit and suspend the test piece carrying sideup from the horizontal bars ensuring that thesuspension wires are vertical.

After 5 min measure the deflection of thebelting from the level of the uppermostcomers to the lowest point on the carrying-side of the belting.

Calculate the value for the troughability ofthe belting as the ratio F/L

= the deflection of the test piece, and

= the flat width of the belting (length of testpiece).

J-8 REPORT

The following information shall be reported:

a) The width of the belting;

b) The troughability value; and

c) Reference to this Annex, that is IS 15143,Annex J.

ANNEX K

(Clause 7.5)

METHOD OF TEST FOR ELECTRICAL RESISTANCE

K-1 SCOPE

This Annex sets out a method for determining theelectrical resistance of conveyor belting.

K-2 PRINCIPLE

The electrical resistance is determined betweenelectrodes placed on the surface of the belt.

K-3 APPARATUS

K-3. 1 Measuring Instrument

The resistance measuring instrument shall cover therange 10Gohms (1 megaohm) to 1010ohms (10 000megaohms) and be accurate to within + 5 percent ofthe true value over this range, The potential applied tothe electrode under test is between 40 and 1000 V dcand is chosen so that not more than 1 Watt is dissi-pated in the first piece.

K-3.2 Brass Contact Pieces

The brass contact piece shall consist of a cylinder andring of dimensions as given in Fig. 9. The lowersurface of each contact piece is machined flat, polishedand clean, each contact piece is provided with a flexibleinsulated load.

K-3.3 Polythene Base Sheet

A clean sheet of polythene or other materials withresistivity not less than that of polythene and ofminimum dimensions of 300 mm x 300 mm x 2 mmthick.

K-3.4 Electrode System

Each electrode system shall comprise of two electrodesof soft thin metal foil consisting of circular metal disc25 mm in diameter with a concentric annulus havinginternal and external diameters of 125 mm and

16

IS 15143:2002

BELT SAMPLE

BRASS RING BRASS CYLINDER

32

I

h!%to

I~!! II 22

L !6?<1 I \INSULATIOMIN. THICK

15m

PIECESFIG.

All dimensions in millimetres.

9 TESTLAY-OUT SHOWINGSUITABLEWORKINGDIMENSIONSOFBruss CONTACT

150 mm respectively as shown in Fig. 10. Care is takento ensure accuracy of the dimensions of the electrodes,but the symmetry of the annulus about the centre discis not critical. Electrode system shall be applied toeach of the test areas centrally.

NOrES

I Suitable foils areas follows :

a) For general use: Tin on lead, 1.5 percent tin,

98.5 percent lead, 0.025 mm thick,

3.5 m2/kg.b) For indented surface: Soft tin foil, 98.25 percent tin, 1.25

percent antimony, 0.5 percent

copper.

i) 0.0056 mm thick, 25 m2/kg.

ii) 0.0076 mm thick, 18 m2/kg.

2 The foil electrodes may be omitted if the belt surface is

sufficiently smooth and flat to enable the liquid contact agent to

maintain continuous contact between the belt and brass contact

pieces, but with other surfaces the omission may result in the

indicated resistance being higher than the true resistance.

K-4 PREPARATION OF TEST PIECE

K-4.1 General

Prepare two test areas on the upper surface of thesample of belting and two on the lower surface, eachtest area measuring not less than 300 mm x 300 mm.

K-4.2 Surface Cleaning

Clean the surfaces of the test areas by dusting and

rubbing with fuller’s earth (B.P. grade) using a cleanpad of cloth or cotton wool. After all traces of powderbeen cleaned away, wipe over the surfaces with a cleanpad moistened with distilled water and then rub drywith a clean cloth.

AHdimensions in millimetres.

FIG. 10 ELECTRODESYSTEM

K-4.3 Application of Electrodes

Apply the electrode system centrally on the test area.Attach the electrodes to the test areas by a conductingliquid contact agent consisting of

a)

b)

c)

Anhydrous polyethylene 4 part by mass glycolof relative molecular mass 600;

Soft soap, 1/200 parts by mass; and

Water 1 part by mass.

,

,.

17

=.$

Is 15143:2002

Ensure that liquid coatings of the same dimensions asthe foil electrodes formed on the surface.

NOTE — This may conveniently accomplished with 2 felt pads

of the same dimensions as the electrodes, moistened with the

contact agent. Rub the electrodes on the test surface with a finger

or small sotl pad. Ifthesurthceisindentedensure that tier rubbing

the foil electrodes clearly follow the indentations. Do not smear

the contact agent on the surface between the central disc and the

annulus. Wipe away any small excess with a clean cotton wool

pad.

K-5 PROCEDURE

Prepare and clean the sample of belting and apply theelectrodes without delay as described in K-4.3. Placethe belting immediately in the following condition fortwo hours:

a) Temperature 27°C + 2°C, and

b) Relative humidity 65 + 5 percent.

Test the samples without delay in the ambientconditions. Place the polyethylene sheet underneaththe belting immediately below the test areas and mountthe brass contact pieces in position on the electrodes.Run the leads from these contact pieces direct to themeasuring instrument so that the outer ring electrodeis always connected to the earthed or low potentialterminal and the inner cylinder to the higher potentialterminal.

Ensure that these leads do not touch each other, thebelting or any part of the apparatus except theterminals to which each is connected. Connect all earthterminals to the same point.

Apply the test potential from the measuring instrumentto the test area and measure the resistance when asteady indication is obtained. Apply the test potent iaIfor a maximum of 5 min.

Avoid breathing on the test areas as any condensationof moisture on to these surfaces may lead to grossinaccuracies in the resistance measured. Repeat thetest in turn on the remaining three test areas.

K-6 TEST REPORT

The following results shall be reported :

a)

b)

c)

d)

The electrical resistance measured in eachelectrode system,

The average value of two resistancemeasurements on the upper surface,

The average value of two resistancemeasurements on the lower surface, and

Reference to this Annex, that is IS 15143,Annex K.

,----

ANNEX L

(Clause 7.6.1)

METHOD OF TEST FOR FIRE RESISTANCE PROPERTY(DRUM FRICTION TEST)

L-1 SCOPE

This Annex sets out a method for determining theignitability and the maximum surface temperature ofconveyor belting subjected to friction.

L-2 PRINCIPLE

A length of belting held stationary under an appliedload is passed around a drum pulley rotating atconstant speed and the surface temperature of the drumis recorded until :

a) The surface temperature exceeds the specifiedlimit,

b) The belting is observed to exhibit flaming orglowing, or

c) The specified time elapses.

L-3 APPARATUS

The general arrangement of the drum frictionapparatus is shown in Fig. 11.

L-3.1 Steel Drum

The steel drum of external diameter 210 + 1 mmmounted on a horizontal axis and capable of beingrotated under all load conditions at 200 + 5 rev/m in.To achieve this a power supply of at least 7.5 kW isrequired. Detailed dimensions of the drum, shown inFig. 12 are given in order to standardize its thermalcharacteristics. The variation in diameter along thelength of any one drum is a maximum of 1 mm.

4

18

Is 15143:2002

,&

fr7Ll

._ a--i ‘“c’

[+ ‘ ‘-A+@

— . ..L—_ .— -. —.-.

r+ -k ]. .

GUIDEPULLEY ., ....

,., . .. ..t. r. ,

—. . .

E4LANCE

270 APPSOX

J. 10 u . .

ILw-’! r f.,4i(

14?1! 1OALANCE WEIGHTSHOWN N COUNTER8ALANCE POSITIO)4 5

J - L-L I

I lLWJ

ION

All dimensions in millimetres.

FIG. 11 GENERAL ARRANGEMENT OF DRUM FRICTION TESTING APPARATUS

Notwithstanding the dimensions and tolerances ondrum diameter and shell thickness shown in Fig. 12,the effect of wear down to a minimum shell thicknessof 6 mm is permissible.

L-3.2 Drum Temperature Measuring Device

A temperature measuring device is to indicate thetemperature of the surface of the drum, comprising ofa thermocouple set with its tip not greater than 0.5 mmbelow the surface, midway along the drum. Themethod of mounting the thermocouple is shown inFig. 13. Care is taken to see that the effective ‘coldjunction’ temperature is compensated for oralternatively is measured and the appropriatecorrection made.

NOTES1The functioning of the slip ring contacts should be checked

periodically by observing that there is no change in the recorded

temperature when the apparatus is run without a test sample.

2 The modification of the drum friction test equipment to give a

more accurate measurement of the temperature of the drum surface

has been included in Fig. 13. However, till such time, equipments

are updated to measure the temperature of the drum surface from

inside as explained in L-3.2 measurement of the temperature of

the outside surface oftbe drum shall be permitted. Temperature

of the surface of the drum during the test when measured from

outside surface shall at no time exceed 325”C.

L-3.3 Tensioning System

A tensioning system for applying tension to the testpiece as shown in Fig. 14 shall be used. Principaldimensions of the tensioning system are given in orderto standardize its moment of inertia.

L-3.4 Air Current

Suitable means shall be available for providing an aircurrent having a velocity of 2.0 + 0.1 m/s whenmeasured with the test piece in position at a distanceof 200 mm from the surface of the drum. The actualair velocity should be measured by an anemometerand be checked at regular intervals.

NOTE— The air current can be produced by a blower fan or

from a perforated pipe supplied with compressed air. In the latter

case a pipe with 10 mm to 13 mm internal diameter, perforated

along one side with a row of hole of 0.8 mm to 1.5 mm in diameter

19

Is 15143:2002

r11T!-4

IIIIIIIIII

;IiI

I

IJ

III

I

I

IIIII

1I i

II i’;

‘-= ==L J=4=:,-

I

I

%=+4

+0.5- 6.25 0

SHELLTHICKNESS

q

k

. ---’

All dimensions in millimetres.

FIG. 12 DETAILEDDIMENSIONSOFS~EL DRUM

should be fixed horizontally at the back of the drum (that is,of fumes from the vicinity of the apparatus, the veloc itybetween top and bottom of belt) 600 mm from drum the centre

and the same horizontal plane, with the row of holes facing the of the air current through the system shall not exceeddrum Approximately 20 kPa air pressure is required at the pipe. 0.5 mls.

L-3.5 Anemometer L-4 NUMBER OF TESTS

An anemometer shall be available to measure the On belting which has the same thickness and materialvelocity of air current to an accuracy of* 5 percent. of cover on both sides, four tests shall be carried out.Where an extractor system is provided for the removal Two of these tests shall be made in still air and the

20 I

I

IS 15143:2002

+-t--

---w-DETAIL OF GLAND

.- ---

,

Alldimensions in millimetres.

FIG. 13 ARRANGEMENTOFDRUMTEMPERATUREDEVICE

other two in moving air as described in L-6.2and L-6.3, respectively. With belting in which thethickness and/or the material of one cover varies fromthat on the other side, eight tests shall be carried out.One test in still air and one test in moving air shall becarried out when each of the two covers are in contactwith the drum. Two further tests in still air and twofurther tests in moving air shall be carried out withthe cover which when, it was next to the drum gavethe worst results in the preliminary test.

L-5 PREPARATION OF TEST PIECE

Cut the test pieces parallel to the belt edge, each piececonsisting of a rectangular strip of belting 150 mmwide and not less than 1.0 m long.

L-6 PROCEDURE

L-6.1 General

Prior to each test, clean surface of the horizontal steeldrum with emery cloth so as to remove all traces ofany rust or debris of conveyor belting produced bycarrying out previous tests. In the clean condition, thedrum is bright as judged by eye and smooth to thetouch. Ensure that the temperature of the drum doesnot exceed 30”C.

L-6.2 Test in Still Air

Pass the test piece through an arc of 180°C aroundthe still drum. Ensure that the horizontal end is rigidlysecured and the free vertical end attached to the

21

Is 15143:2002

tensioning system asshown in Fig. 14. After app1yingtension of 343N rotate the drum at 200* 5rev/minaway from the rigidly secured horizontal end of thetest piece (that is, similar to the forward direction of aconveyor drive) for a period of 60 min. During thisperiod the tension shall be maintained at 343 N.

Examine the test piece for any visible signs of flameor glow during the test. After the 60 min period, leavethe two pieces within the itifluence of the specifiedair current until either flame or glow occurs or it isclear that neither is possible. Record the surfacetemperature of the drum during the test.

NOTE — It may be necessary in the initial stages of a test, toreduce the tension in the sample by reducing the force applied to

the free end in order to prevent tbe motor driving the drum from

stal Iing. Such reductions should be kept to the minimum possible

and the full initial tension of 343 N should be applied as evenly

and as quickly as possible.

L-6.3 Test in an Air Current

Carry out the test in accordance with L-6.2 using anair current as described in L-3.4. The air supplied tothe apparatus is at normal ambient temperature, butdo not make tests in air at a temperature of less than5“C.

L-7 TEST REPORT

The following results shall be reported:

a)

b)

c)

The presence or absence of flame or glow ineach test.

The maximum temperature of the surface ofthe drum in each test.

Reference to this Annex, that is 1S 15143,Annex L,.

I 159 I 305{

!I

I1

+- + ~ + I + 1 i75

I III I 1 I 1 , I I 1

bk)‘-1-’X/l \

‘+%&

I H M-l-H I ~’157 157 157 157* .

I ‘1 II--I-T

? 11+ 129

e!i-!i-BALANCE WEIGHTIN COUNTERBALANCE POSITION

Alldimensions in millimetres.

FIG. 14 BALANCEWEIGHTLEVERFORDRUMFRICTIONTESTINGAPPARATUS

22

,’ ..-

IS 15143:2002

ANNEX M

(Clause 7.6.2)

METHOD FOR DETERMINING FIRE RESISTANCE PROPERTY(SPIRIT BURNER FLAME TEST)

M-1 SCOPE

This Annex sets out a method for determining theignitability and flame propagation characteristics ofa horizontally oriented specimen of conveyor belting.

M-2 PRINCIPLE

The end of a horizontally oriented specimen of beltingis subjected to a flame from specified spirit burner for

a given period and the duration of flame after removalof the burner is measured.

M-3 APPARATUS

M-3.1 Burner

A spirit burner (see Fig. 15) fitted with a suitabledevice so that h can be moved away from the test piecewithout opening the door of the cabinet. The supplyof fuel is from a reservoir having a graduated sidearm as shown in Fig. 16.

9.

●3.2 iO.1 X 7.~0.1 DEEP

@25 II DETAIL OF JET

19

70 —

I %!8

=Xj &E!?Ass WIRES

I @l.6 x 150 LONG

.’

,.,.- ---’

[Jnless otherwise specified length tolerances +0.5, diameter tolerances +0. 1

Alldimensions in miliimetres.

FIG. 15 SPIRITBURNER

23

Is 15143:2002

VENTED PIJJG

K

OPEN GRADUATEDSIDE ARM 10 mm

CAPACITY

FIG. 16 RESERVOIR

-

II

I

WITHGRADUATEDSIDE ARNI

.. ---”

1

24

c%—

M-3.2 Fuel

The burner is supplied with industrialspirit. This spirit is an approximate

methylatedmixture of

5-percent by volume wood naptha (mainly methanol)and 93 percent of an ethanol/water mixture such thatthe relative density of the spirit is 0.814 at 20”C.

M-3.3 Cabinet

The test shall be carried out in a cabinet to the designand dimensions shown in Fig. 17. The inside of thecabinet is black. The cabinet is provided with anadjustable device to hold the test piece in position(see Fig.18).

NOTES

1 Additional close fitting hole maybe made in the cabinet for the

entry of the remote handling device of the burner and the fuel

pipe.

2 A fume hood with an extraction fan maybe positioned above

the cabinet, the fan may be run during the test provided that it

does not induce air movement through the cabinet additional to

that required fortheoperationof thebumer.Wherethkconditionis not satisfied, the fan is switched off during the test.

M-3.4 Stop Watch

A stop watch with graduations of at least 0.2s or less.A stop watch with a 30 s full sweep is suitable.

IS 15143:2002

M-3.5 Band Facer

A mechanically driven band facer with a 60 gritaluminium oxide or a silicon carbide band, not lessthan 100 mm in width.

M-4 PREPARATION OF TEST PIECES

Cut eight test pieces each 25 mm wide by 150 mmlong clearly from the sample parallel to the length ofthe belt. Cut the test pieces from places at a distancefrom each other, so as to be representative of the wholearea of the sample of the belting. Four of the test arcfor tests with covers intact. For other four test piecesremove the covers from the end to be tested by buffingof the band facer in the direction of the length of thetest piece. Remove at least 50 mm length of the covers.

M-5 OPERATION OF THE BURNER

The burner is operated as follows:

a)

b)

With the control valve closed, check that thefuel consumption is zero and then heat theburner by burning fuel in the primaty heatingcup.

Adjust the reservoir so that the fuel is760 * 20 mm above the base of the burner.

VENTILATION HOLE 0150/

“m/. VERTICALLY PREFERABLY

WINDOW APERTURE COVERED BY

AN AIRTIGHT TRANSPARENT PANEL

/+7 J= ●.g. 4.5 - 5 TOUGHENED-.

DOOR SNALL BE FLUSH FllllNG.SHALL COMPLETELY COVER CABINETAPERTURE AND SHALL

SOOA GLASS

AA

30 x 30 *5 ANGLE I

IRON FRAME WORK, IIF REQUIRED

I

\ II ‘7 VJrl’”’i’’’’r%=+I

APERTURE 600 X 600 :

TOP, SIDES AND BASEHARO ASBESTOS SHEET OR1.&t 0.1 METAL SHEET SIOE OF CABINET

\ll k )’

r

--i

v VIEW /4

All dimensionsinmillimetrcs.FIG. 17 CABINETFORFLAMETEST

25

1s 15143:2002

Fully open the control valve at least one turnand ignite the burner. Allow the flame tostabilize for 10 min.

c) Check the fuel consumption for at least 1 minwhile feeding the burner from the graduatedside arm with the main reservoir tap closed.During the measurement check that the meanfuel level in the side arm is 760 mm above theburner base. Ensure that the fuel consumptionas measured is 2.55 * 0.15 ml/min.

d) During the testing, maintain the fuel level inthe reservoir within the range 760 + 20 mmabove the base of the burner.

M-6 PROCEDURE

Perform the tests in the cabinet in subdued light. Lightthe burner and operate as described in M-5. Insert thetest piece into the holder, ensuring that the test pieceprojects a minimum of 50 mm beyond the edge of theholder. Adjust the holder so that with the burner intest position that is placed centrally on the base plateof the cabinet, the following conditions are satisfied:

a) The faces of the test piece are vertical, thelong edges horizontal and the lower edge50 mm above the top of the burner flame tube.

b) The test piece is located centrally in the flamewith its front edge coincident with the outer

edge of the flame as given in Fig. 19.

c) The test piece is normal to the door of thetest cabinet so that both faces can be observed.

Bring the burner to the test position, andsimultaneously start the stop watch and close thecabinet door. After 30 s, move the burner quickly butsmoothly away from the sample to the side of thecabinet using the remote handling device. Record thetime taken for all visible flame or glow to disappearfrom any part of the test piece after the withdrawal ofthe burner.

M-7 TEST REPORT

The following results shall be reported:

a)

b)

c)

The time for all visible flame or glow todisappear on each of the four individual testpieces with covers intact. The average timefor all visible flame or glow to disappear onthe four test pieces with covers intact.

The time for all visible flame or glow todisappear on each of the four individual testpieces with covers removed. The average timefor all visible flame or glow to disappear onthe four test pieces with cover removed.

A reference to this Annex, that is 1S 15143,Annex M.

AHdimensions in millimetres.

FIG, 18 TESTPIECESUPPORT

26

IS 15143:2002

I)

I

I

))

1

;1[

FLAME OUTLINE( DIAGRAMMATIC ONLY)

TEST PIECE

150 mm 50tmm

~+

I0

+-w

FIG. 19 LAY-OUTOFSPIRITBURNERFLAMETEST

ANNEX N

(Clauses 7.6.3 and 7.6.3.1)

METHOD FOR DETERMINING COMBUSTION PROPAGATION CHARACTERISTICSOF CONVEYOR BELTING — THE HIGH ENERGY PROPANE BURNER TESTS

N-1 SCOPE conveyor belting for use in underground coal mines.

This Annex sets out a method for determining the N-3 PRINCIPLEflame propagation characteristics of a horizontallyoriented specimen of conveyor belting of 1600 kN/m Large test pieces (approximately 4 m x 1 m) of belting

width and above. are in turn located horizontally on the trestle of a testgallery in a controlled air stream and subjected (from

N-2 APPLICATION underneath) to controlled flame from a propane burner,

This method is primarily used for type approval offor a specified period, then left on the trestle until allflame and glow have been disappeared. Measurements

“.. --’

27

1s 15143:2002

of the undamaged length of each test piece are thentaken.

N-4 APPARATUS

N-4.1 Gallery

The test shall be carried out in an experimental galleryof square section 2 m x 2 m, through which air isdrawn by a fan.

N-4.2 Trestle

A trestle as shown in Fig. 20 shall be a framework of2.2 m long and 1.25 m wide constructed from steeltubing. The upper sides of the trestle frame shall befitted with rod retainers in order to position and retainfifteen steel bars, made of 18/8 austenitic chrome/nickel steel, resistant to rust, acid and heat. The barsshall be 10 mm diameter x 1.4 m long and form theframe on which the belt rests. The upper surface ofthe bars shall be 350 mm from the floor. Two trestlesshall be used positioned end on to each other so thattotal trestle length is 4.4 m.

N-4.3 Burner

The burner as shown in Fig. 21 shall consist of a450 mm square frame having an overall height of220 mm constructed from steel tubing. The tube shal Ihave 52 holes of 1.5 + 0.1 mm in diameter drilled at50 mm intervals.

N-4.4 Fuel

The burner shall be fed with bottled propane gas of atleast 95 percent and preferably 99 percent puritythrough a pressure reducing valve, high pressure hosehaving minimum internal diameter of 6.0 mm. Beforeand during the test, the gas cylinder shall be immersedto approximately two-thirds of its height in a bath ofwater at a temperature of 25°C + 3°C. The gas cylindershall not be emptied at the end of a test by more than90 percent of its gas weight capacity.

The weight of gas consumed during a 50 min test shal Ibe 7.50+ 0.25 kg. This maybe achieved by controllingthe gas pressure at the high pressure side of an orifice

DIRECTION OF AIR FLOW tao *5Ssoo *5

1100

LowIS 6603:1 S72

l!zze25 SSOM 5

Iii+ ~ ‘+

I-. ——-- ------ ------------ ------ ---.—-—- ——--——--

5 T

) {

lL

75 7s f 4 SLOTS C/C 1501

.. --”

DETAIL OF RETAINING RING

All dimensions in millimetres.

FIG. 20 PROPANEBURNERTRESTLE

28

Is 15143:2002

0&22.5 *2.5

tn“–-——-—-—.—.— .—-—-—-—-—-—-—-—-—t i ~ I

[ ! 220.5

20 310 450* 104 mI 3 *1

! ~

35.5, , S2 HOLES 01.5* 0.1 !,,

r

1/ I I

,

- 1- I50 I

ORIFICE PIATE T150

T

HOLE 025, 1.7 THICK - I-4.4- ; ; ; : -L-4- ~ ‘f

ii I I I ri 50

ID 50,:0 450 ●

I I

r l!~!l 5i”L&R

FJOTE---Gtmeral manufacturing tolerances unless otherwise stated =+ 4 percent,

All dimensions in millimetres.

FIG. 21 PROPANEBURNER

plate (1.7 mm thick with a 2.5 mm diameter hole) toapproximately 0.20 MPa. The pressure reducing valve,the non-return valve and the orifice plate should bepositioned as close to each other as possible. Asensitive precision pressure gauge should be used tomonitor the pressure at the high pressure side of theorifice plate.

Alternatively, the orifice plate and sensitive pressuregauge may be replaced by a flow-meter inserted intothe gas supply line after the non-return valve. Theflow-meter shall be calibrated to ensure that the correctweight of the gas is consumed.

N-5 SAMPLING OF MATERIAL

The length of the sample of belting with top and bottomcovers of equal specified thickness shall not be lessthan 8 m for conveyor belting with top and bottomcovers of unequal specified thickness, the length ofthe sample be not less than 12 m. The width of thesamples shall be 1050 mm.

10

N-5.1 Test Pieces

Full width rectangular test pieces each 4 m long shallbe cut from the sample. Two test pieces in the case ofbelting with covers of equal specified thickness andthree test pieces in the case of belting with covers ofunequal specified thickness. The test pieces shal I belaid out flat for 24 h in dry conditions at any ambienttemperature above O°C immediately prior to testingto remove residual curvature.

N-6 TEST PROCEDURE

N-6.1 Two trestles shall be installed centrally on thelongitudinal axis of the gallery with the burner endfacing the direction of the ventilation flow.

N-6.2 Each test piece in turn shall be placed centrallyon the trestle with its transverse edge flush with theburner end of the trestle. The test piece shall be lightlyrestrained, using approximately 1 mm steel or ironwire laid transversely on the belt at 4 to 5 positionsequally spaced during the test to prevent rol Iing up

29

I

Is 15143:2002

and arching but allowing longitudinal movement. Inthe case of belting with covers of unequal specifiedthickness, one test piece shall be tested with the thickercover facing downwards one with thicker cover facingdownwards and a third to provide are-test of the worstcondition found in the previous two tests. Theprocedure is necessary to ensure that the minimumtwo samples are tested in identical conditions.

N-6.3 The air current in the gallery shall be adjustedto give an average velocity of 1.5+ 0.1 m/s, at a heightof 350 mm. The measurement shall be taken on thecentral line of the trestle and at a distance of 750 mmupward of it.

N-6.4 The burner shall be placed centrally with thefour parallel burner tubes in line with the longitudinalaxis of the test piece and positioned so that the distancefrom the top of the burner to the top of the bars onwhich the belt rests is 130 * 5 mm with the transverseend row of burner holes 50 mm inside the verticallyprojected transverse edge of the test piece.

N-6.5 The burner shall be lit and the rate of gasconsumption immediately adjusted as definedin N-4.4. At the end of 50 rein, the gas shall beswitched off and the burner withdrawn from underthe trestle. This prevents molten and charred materialfrom falling on to the burner and blocking the holes.

N-6.6 The test piece shall be left on the trestle untilall flame and glow have disappeared.

N-7 TEST DURATION

N-7.1 The test shall be terminated and shall be deemedto be terminated normally when both the followingconditions are satisfied:

a) A period of at least 70 min has elapsed after

b) A period of at least 10 min has elapsed afterall flaming on the test piece and debris hasceased.

N-7.2 Safety Requirements

The test shall be conducted with reasonable cautionhaving due regard to health and safety considerationsarising from the generation of smoke and heat andshall be terminated immediately if at any time it isconsidered advisable to do so. Any test terminated asa result of these safety considerations shall be deemedto have been terminated prematurely.

N-8 MEASUREMENT OF DAMAGE TO TESTPIECE

N-8.1 The length of the test piece which remainsundamaged over its full width shall be measured fromthe trailing edge as shown in Fig. 22 on both the upperand lower surfaces. The lower of the two measurementsshall define the length of belting remainingundamaged.

N-8.2 Measurement in each case shall be made in adirection parallel to the longitudinal axis of the belt.If the edges of the test piece are not parallel becauseof uneven shrinkage, the direction of the longitudinalaxis shall be judged by eye.

Measurement shall be made along the surface of thetest piece even if the test piece has become curved.

N-8.3 Damage Assessment

Blisters or other surface defects not originally present,having no dimensions greater than 5.0 mm, shall bedefined as small blemishes. For the purpose of damage

the beginning of the test; and -

w“

OF UNDAMAGED BELT

TRAILINGEDGE

~/ DAMAGEAS DEFINED IN SUB-C~USE N-8.3

FIG. 22 MEASUREMENTOFDAMAGETESTPIECE

30

IS 15143:2002

assessment to determine the length of test piece whichremains undamaged the following shall apply:

a)

b)

c)

d)

e)

Embrittlement or hardening of the test pieces/

cracking, blistering of other blemishes notoriginally present shall be regarded asdamage;

Up to five small blemishes nearest to thetrailing edge of the test piece shall bedisregarded;

Small blemishes more than 50 mm apart andmore than 50 mm from any other damage,shall be disregarded;

Any further small blemishes shall be assessedin groups, enclosed within circles of up to50 mm diameter. The size and distributionof these groups shall be chosen in such a wayas to produce the most favorable test result.If there is only one such group, it shall bedisregarded. Any two groups which areseparated from each other or from any otherdamage by less than 300 mm of undamagedbelt shall be regarded as damage; and

Sooty deposits or development of a fine matsurface shall not be regarded as damage.

N-9 TEMPERATURE MEASUREMENT

N-9. 1 Temperature measurement shall be by meansof mineral insulated, stainless steel sheathedthermocouples having a nominal outside diameterof2.O mm.

N-9.2 Thermocouples shall be located at each of the25 points indicated in Fig. 23 in a vetiical plane normalto the longitudinal axis of the gallery and 6.0 m behindthe leading edge of the test piece.

N-9.3 The average temperature indicated by thethermocouples shall be recorded either continuouslyor at regular intervals not exceeding 6s. The recordingshall continue throughout the whole period of the test.

N-9.4 The temperature of the incoming air stream shallbe measured with a further thermocouple placed300 mm from the entrance to the gallery in the positionshown in Fig. 23. Care shall be taken to ensure thatthis thermocouple is shielded from any local sourceof heat. The temperature shall be recorded throughoutthe test either continuously or at regular intervals notexceeding 6 s.

N-9.5 The temperature also shall be the differencebetween the average temperature of the 25 thermo-

couples and the temperature of the incoming air

stream. The average value of this temperature rise overperiods of 1 rein, shall be examined and the highestvalue obtained over any 1 min period shall be termedas the maximum average temperature-rise.

N-10 MEASUREMENT OF LENGTH OFBELTING CONSUMED

N-1 0.1 The length of conveyor belting consumed inthe test shall be determined from measurements ofmass before and after testing.

N-10.2 The test piece shall be weighed before the test.After the test, all conveyor belting remaining on thetrestle shall be removed and after it has cooled toambient temperature, any friable material shal I bedetached. The remaining conveyor belting shall beweighed.

N-10.3 The length of conveyor belting consumedduring the test shall be calculated as follows:

Length consumed = (Ml - ~z) ~ Q metre

M,

where

Ml = (mass of test piece before test) – (mass ofsteel cord), and

M, = (mass of test piece remaining after test) -(mass of steel cord)

N-1 1 REPORT

The following information shall be reported:

a)

b)

c)

d)

e)

o

g)

h)

Time taken for all flame or visible flame todisappear.

Length of belting which remain undamagedover its full width.

Length of belting consumed.

Ambient air temperature at start of test.

Belt sample specification and cover thickness.

Cover thickness exposed to flame.

An explanatory statement as follows:

These test result on their own do not indicatethe fire hazard of the belting under actualfire condition and consequently should notbe applied to the assessment of fire hazardwithout taking into account additionalsupportive information.

A reference to this Annex, that is, IS 15143.Amex N.

.----

31

--+--+--+- 4- +---

+ -4’+ -4- +--400

-+400

-+-

-+-

-+- +’- +- -+--i

+-4- +-4-+

!00

20 Locations of 5 x 5 Thermocouple Array

.

19s0- 4

b2000

All dimensions in millimetres.

400

-----

FIG. 23 LOCATIONOFTHERMOCOUPLEFORINCOMINGAXR(VIEWEDFROMENTRANCETOGALLERY)

29

Is 15143:2002

ANNEX P

(Clauses 7.6.4 and 7.6.4.1)

METHOD FOR DETERMINING COMBUSTION PROPAGATION CHARACTERISTICSOF CONVEYOR BELTING — LOW ENERGY PROPANE BURNER TESTS

P-1 SCOPE

This Annex sets out a method for determining theflame propagation characteristics of a horizontallyoriented specimen of conveyor belting of below1600 kN/m width.

P-2 APPLICATION

This method is primarily used for type approval ofconveyor belting for use in underground coal mines.

P-3 PRINCIPLE

Large test pieces, approximately 2 m x 1 m of beltingare, in turn located horizontally on the trestle of a testgallery in a controlled air stream and from underneath,subjected to controlled flame from a propane burnerfor a specified period and then left on the trestle untilall flame and glow have disappeared. Measurementsof the undamaged length of such test piece are thentaken.

P-4 APPARATUS

P-4.1 Gallery

The test shall be carried out in an experimental galleryof square section 2 m x 2 m, through which air isdrawn by a fan.

P-4.2 Trestle

A trestle as shown in Fig. 20 shall be a framework of2.2 m long and 1.25 m wide constructed from steeltubing. The upper sides of the trestle frame shall befitted with rod retainers in order to position and retainfifteen steel bars, made of 18/8 austenitic chrome/nickel steel resistant to rust, acid and heat. The barsshall be 10 mm diameter x 1.4 m long and form theframe on which the belt rests. The upper surface ofthe bars shall be 350 mm from the floor. Two trestlesshall be used positioned end on to each other so thattotal trestle length is 4.4 m.

One trestle shall be used during the tests.

P-4.3 Burner

The burner as shown in Fig. 21 shall consist of a 450mm square frame having an overall height of 220 mmconstructed from steel tubing. The tube shall have 52holes of 1.5 + 0.1 mm in diameter drilled at 50 mmintervals.

P-4.4 Fuel (see N-4.4)

The weight of gas consumed during a 10 min testperiod shall be 1.30+ 0.50 kg. This maybe achievedby controlling the gas pressure at a standard orifice.A regulator is used to control the gas pressure atapproximately 0.158 MPa when the orifice plate is1.7 mm thick with a hole 2.5 mm in diameter whichis fitted into the ‘handle’ of the burner, as shown inFig. 21, with a sensitive precision pressure gaugewhich has been calibrated to ensure that the correctweight of gas is consumed and used for monitor thepressure in front of the orifice plate.

Alternatively the orifice plate and sensitive pressuregauge may be replaced by a flowmeter calibrated toensure that the correct weight of gas is consumed,inserted into the gas pipe line after the reducing valve.

P-5 SAMPLING OF MATERIAL

The length of the sample of belting with top and bottomcovers of equal specified thickness shall be not lessthan 4 m. For conveyor belting with top and bottomcovers of unequal specified thickness, the length ofthe sample shall be not less than 6 m. The width ofthe samples shall be 900 mm.

P-5.1 Test Pieces

Full width rectangular test pieces each 2 m long shallbe cut from the sample (that is, two test pieces forbelting with covers of equal specified thickness andthree test pieces for belting with covers of unequalspecified thickness). The test pieces shall be laid outhorizontally for at least 24 h in dry conditions at atemperature between O°C and 40”C in shadeimmediately prior to testing to remove residualcurvature.

P-6 TEST PROCEDURE

P-6.1 One trestle shall be installed centrally on thelongitudinal axis of the gallery with the burner end

facing the direction of the ventilation flow. The testpiece shall be placed centrally on the trestle with itstransverse edge flash with the burner end of the trest le.The air current in the gallery shall be adjusted to givean average velocity of 1.5 + 0.1 m/s at a height of 350mm. The measurement shall be taken on the centreline of the trestle and at a distance of 750 mm upwardof it.

33

Is 15143:2002

The burner shall be placed centrally with the fourparallel burner tubes in line with the longitudinal axisof the piece, and positioned so that the distance fromthe top of the burner to the top of the bars on whichthe belt rests is 130 * 5 mm with the transverse endrow of burner below 50 mm inside the verticallyprojected transverse edge of the test piece.

P-6.2 The burner shall be lit and the rate of gasconsumption immediately adjusted as definedin P-4.4. At the end of 10 min the gas shall be switchedoff and the burner withdrawn from under the trestle.This prevents molten and charred material from fallingon to the burner and blocking the holes. The test pieceshall be left on the trestle until all flame and glowhave disappeared.

P-7 TEST DURATION

P-7. 1 The test shall be terminated and shall be deemedto be terminated normally when both the followingconditions are satisfied:

a) A period of at least 20 min has elapsed afterthe beginning of the test; and

b) A period of at least 5 min has elapsed afterall flaming on the test piece and debris hasceased.

P-7.2 Safety Requirements

The test shall be conducted with reasonable cautionhaving due regard to health and safety considerationarising from the generation of smoke and heat andshall be terminated immediately if at any time it isconsidered advisable to do so. Any test terminated asa result of these safety considerations shall be deemedto have been terminated prematurely.

P-8 MEASUREMENT OF DAMAGE

P-8.1 The length of the test piece which remainsundamaged over its full width shall be measured fromthe trailing edge as shown in Fig. 22 on both the upperand lower surfaces. The lower of the two measurementsshall be defined as the length of belting remainingundamaged. Measurement in each case shall be madein a direction parallel to the longitudinal axis of thebelt, if the edge of the test piece are not parallel becauseof uneven shrinkage, the direction of the longitudinalaxis shall be judged by eye. Measurement shall bemade along the surface of the test piece even if thetest piece has become curved.

P-8.2 Damage Assessment

Blisters or other surface defects not originally present(having no dimensions greater than 50 mm) shall bedefined as small blemishes. For the purpose of damageassessment to determine the length of test piece whichremains undamaged the following shall apply:

a)

b)

c)

d)

e)

Embrittlement or hardening of the test piece,cracking, blistering and other blemishes notoriginally present shall be regarded asdamage;

Up to five small blemishes nearest the trailingedge of the test piece disregarded;

Small blemishes more than 50 mm apart andmore than 50 mm from any other damage,shall be disregarded;

Any further small blemishes shall be assessedin groups, enclosed within c~cles of up to50 mm diameter. The size and distributionof those groups shall be chosen in such a“wayas to produce the most favorable test results.If there is only one such group, it shall bedisregarded. Any two groups which areseparated from each other or from any otherdamage by less than 300 mm of undamagedbelt shall be regarded as damage; and

Sooty deposits or the development of a finemat surface shall not be regarded as damage.

P-9 REPORT

The following information shall be reported:

a)

b)

c)

d)

e)

9

g)

Time taken for all flame or visible glow todisappear.

The measurements for each test piece, on bothupper and lower surface of lengths whichremain free from damage.

Ambient air temperature at start of test.

Belt sample specification and cover thickness.

Cover thickness exposed to flame.

An explanatory statement as follows:

These results on their own do not indicatethe fire hazard of the belting under actualtire conditions and consequently should notbe applied to the assessment of fire hazardwithout taking into account additionalsupportive information.

A reference to this Annex, that is 1S 15143,Annex P.

34

Is 15143:2002

ANNEX Q

(Clause 7.8)

METHOD FOR DETERMINING DYNAMIC CORD PULL-OUT FATIGUE RESISTANCE

Q-1 SCOPE

This Annex sets out a method for determining thedynamic strength of the cord-to-rubber bond in a steelcord reinforced belt.

Q-2 PRINCIPLE

The dynamic strength of the cord-to-rubber bond isdetermined by applying a cyclic load to a test piecefor a minimum number of cycles, or till failure of thebond occurs.

Q-3 APPARATUS

A suitable testing machine which can accommodatethe test piece and which is capable of applying a steadycyclic tensile loading, is required. The cyclic loadranges from 3.6 to 36 percent of the nominal pull-outstrength for a given cord diameter (see Fig. 24).

Q-4 TEST PIECE

A test piece shall be cut from a full thickness sectionof the belting containing five cords. The test pieceshall be cut to the arrangement shown in Fig, 7. Thetest length shall be 100 + 2 mm. The covers may beremoved 100 mm from the end of the test piece to

facilitate the use of conventional grips.

Q-5 PROCEDURE

The procedure shall be as follows :

a)

b).

c)

Mount the test piece centrally in the jaws ofthe machine.

Steadily apply the cyclic load and release itwith a pause at the high and low levels(see Fig. 24). The time for one completedcycle shall be between.5 and 10 s.

Continue the test until the sample fai Is or10 000 cycles are completed, whichevercomes first.

Q-6 REPORT

The following information shall be reported :

a) Whether the sample failed, that is, there wasevidence of cord pull-out, before 10 000cycles were completed.

b) The nominal static pull-out strength of thecord being tested.

c) The maximum and minimum load levels.

d) A reference to this Annex, that is IS 15143,Annex Q.

n

bL=-=1“ME

FIG. 24 TYPICALCYCLE LOADINGPATTERN

35

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goodsand attending to connected matters in the country,

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BIS has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BIS. This does not preclude the free use, in the course ofimplementing the standard, of necessary details, such as symbols and sizes, type or grade designations.Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of‘BIS Catalogue’ and ‘Standards: Monthly Additions’.

This lndian Standard has been developed from Doc : No. BP 29 (0080),

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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