Presentation BS 476

8/11/2019 Presentation BS 476

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BS 76 Fire Tests

on Building Materials and

Structures

Presented By

Chaturbhuja DalaiASE/VAC

Suhasini Arya

JE/VAC

20-08-2014


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BS 476 OVERVIEW

First, published as a single volume in 1932.

Then revised in 1935 into three parts:

Part- 1, 2 3.

BS 476 Part-1 is related to combustibility of

materials, surface spread of flame for

materials fire resistance of structures.

Revision of Part-1 was republished in 1971

which is divided into 4 parts i.e. Part-5, Part-

6, Part-7 Part-8.


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Part Subsequent Revisions Test related to

BS 476Part 5

1971 1979 Replaced by

BS 476 Part12:1991

Method of test for

ignitability

BS 476Part 6

1971 1981 BS 476 Part

6:1989 +A1:

2009

Method of test for fire

propagation of products

BS 476Part 7

1971 1987 BS 476 Part7:1996

Method of test to

determine the

classification of surface

spread of flame of

products

BS 476Part 8

1972 BS 476 Part 20, Part

21, Part 22 & Part

23:1987

Test methods and criteria

for the fire resistance of

building construction


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Applicability in DMRC

ECS/TVS Equipment Shall comply toInsulation (Acoustic and

Thermal)

BS 476 Part 5, Part 6 & Part

7

Flexible Steel Conduits BS 476 Part 6 & Part 7

Packaged split air-conditioning units /VRV units

BS 476 Part 6 & Part 7

Cable containment System BS 476 Part 6 & Part 7

Air filters BS 476 Part 6

Sound attenuators BS476 Part 6 & Part 7

MSFD/MFD BS 476 Part 20

The related clauses.
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Method of

test

for ignitability

BS 476 Part-5: 1979

IGNITABILITY TEST


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Scope

Specifies a method of test for determination

of ignitability characteristics of exposed

surfaces of essentially flat, rigid or semi rigid

building materials or composites, when tested

in vertical position.


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Testing

Specimen Test Apparatus

Test sample shall

comprise three

specimens for each faceto be tested.

Specimen shall be square

with sides 2251.5mm

long. Before testing,

specimens shall be

conditioned to constant

mass at a temperature of

Test frame : U-frame

with 2 clamps at mid

heightGas burner : Metal

tube end reduced to

orifice.

Timing Device : for

measuring the Time

duration.


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Hold specimen vertically by

clamp at height of 75mm from

the base

Ignite the burner move quickly

back to the test position

And simultaneously start the

timing device

Move the burner away after 10s

Note the extent of flaming of

the product during the

application of test flame for

eriod of 10s immediatel

Testing Procedure:

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Test Results:

The performance of the product shall be designated by

letter P if -

1. None of the specimens flames for more than 10s

after removal of test flame.

2. Burning of any specimen does not extent to an edge

during the application of the test flame or within the

10s period following its removal.

Any product not complying with the requirements

shall be designated by the letter X


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Method of test

for fire

propagation of

products

BS 476 Part-6: 1989

TESTING APPARATUS


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Scope

This part of BS 476 specifies a method of

test, the result being expressed as fire

propagation index, that provides a

comparative measure of the contribution

to the growth of fire made by an essentially

flat surface, composite or assembly.


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Test Conditions

Test sample shall comprise a minimum of 3

and a maximum of 5 specimens for each face

to be tested.

Specimen shall be square and 225mm x 225

mm in size.

Specimen thickness shall be of 50mm or less.

Specimen


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Test Procedure:

Ensure that the test apparatus is at ambient

temperature at the start of the test.

Check that hot junctions of thermocouples are

correctly located.

Adjust the heat flow to give output of 527.5

10W and turn it off.

Record the output from thermocouples.

Test Procedure:


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Conditions for test:

Expression of result:

The test sample shall

comprise a minimum

of three and a

maximum of 5

specimens for each

face to be tested.

Propagation index is expressed

inwithout suffix where

The fire propagation Index shall

be stated with a suffix R

where four or five specimens

have to be tested to obtain three

valid results.

Where less than three valid

results are obtained from five

specimens, no fire propagation

index shall be stated and the

product shall be designed

unsuitablefor assessment by this

method

.


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Calculations of

results:

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Application in DMRC Ph-III

Contract CE-10 CE-11

The following products used in DMRC shall be tested

according to BS 476 Part 7:

1.Thermal acoustic insulation for ECS services shall

comply with BS 476 Part 6 7 Class 1. Here,

according to part 7, Class 1 implies that the

propagation of flame after 1.5 min shall be 165mm.


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Introduction

Specifies a method of test for measuring the lateral

spread of flame along the surface of specimen of

product orientated in vertical position under opposed

flow conditions.

First published in 1971, then revision was made in

1987.

BS 476 Part 7:1997, supersedes the above two

revisions.


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Scope

To determine the performance of a product when it is

subjected to conditions of test specified in this part

of BS 476.

Classifications system based on rate and extent of

spread of flame.

The test result is classified according to performance

as Classes 1 to 4.


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Apparatus

Radiation panel and surround:850mm

2

, Specified value of

irradiance 0.5 kW/m2.

Specimen holder:Water cooled.

Pilot Burner

Gas and air supply:Natural gas or

propane.

Test Environment: Volume at least

400m

3

.

General Arrangement of specimen holder


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Ignite the pilot flame. Insert the

specimen

into the

specimen holder, and swing

the specimen holder into

test position. Start the timing mechanism

i.e. start the test.

Extinguish the pilot flame 1

min after the start of test.

Terminate the test when

flame front reaches the

825mm reference line orafter 10 min has ela sed,

Test

Procedure

20-08-2014


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Results :

Observations : Classification of Results :

For each specimen, record:

1. The time at which flame front crosses

each vertical reference line;

2. The max. extent of spread of flame

during first 1.5 min from start of test;

3. The max extent of spread of flame

during the whole test;

4. The time and distance at which

maximum spread of flame reached;

5. Any spread of flame that extends for

less than 50mm whilst the pilot flame is

till on as less than 50mm

Classification of spread of flame

Classification

Spread of flame at1.5 min

Final spread ofspecimen in sample

Limit

(mm)

Limit for

onespecimen

in sample(mm)

Limit

(mm)

Limit for

onespecimen

in sample(mm)

Class 1 165 165+25 165 165+25

Class 2 215 215+25 455 455+45

Class 3 265 265+25 710 710+75

Class 4 Exceeding the limits for Class 3


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Test methods and

criteria for the

fire resistance of

building

construction

BS 476 Part-8: 1972

VERTICAL FIRE FURNACE


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Application in DMRC Ph-III

Contract CE-10 CE-11

MSFD/MFD shall comply with

BS 476: Part 20

.

MSFD/MFD shall be tested in accordance with the

procedure specified in

BS 476: Part 20

with respect

to the requirements of elevated temperature and air

leakage of the MSFD/MFD

.


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Introduction

First revision of BS 476 Part 1 published in 1947 as

BS 476 Part 8.

Revision of Part 8 republished in 1972.

The four parts, BS 476 Part-20, 21, 22 23, taken

together constitute a complete revision of BS 476 Part

8 published in 1987.

The objective of determine fire resistance as described

in this part of BS 476 is to assess the behaviour of a

specimen of element of building construction when

subjected to defined heating and pressure conditions.


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ScopeThis part specifies heating conditions,

methods of test and criteria for

determination of fire resistance of

elements of building construction. The

tests are appropriate to the following:

20-08-2014

Clauses in Part-8 Revised Parts

Walls and partitions (load bearing and non load bearing)

Part 21

Floors

Flat roofs

Columns

Beams

Suspended ceilings protecting steel beams Part - 23

Door and shutter assemblies

Part - 22Glazing

Ceiling membranes


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TestingTest Procedure:

The specimen shall be heated in a

furnace which can produce a

positive pressure.

Standard Heating Conditions:

The temperature of the furnace

shall be controlled to vary with

time as closely as possible in

accordance with standard

time/temperature curve.

The test specimen shall be heated

in until failure has occurred

under all relevant test criteria.

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Test Procedure:


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Observations & Results:Observations during test: Test Results:

Recording:

Stability: The deformation of

specimen, occurrence of

collapse, or any other factor

which could affect its stability.

Integrity: In elements which

have separating function the

presence of cracks or other

openings shall be noted.

Insulation: In elements

having separating function

Test results stated in

the Time in minutes

from start of the test

until failure has

occurred under one or

all of the criteria.


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Criteria of failure:

General Conditions:

Non-load bearing:

Failure shall be deemed to occur

when collapse of the specimen takes place.

Load bearing : A load bearing specimen shall support

the test load during the prescribed heating period and

also after 24 h after the end of heating period.

Insulation : Failure shall be deemed to occur when the

mean temperature of the unexposed surface of the

specimen increases by more then 140 C above initial

temp.


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Floors and Flat roofs: According to above all criteria of failure.

Columns: Compliance with Stability

Beams:

Compliance with

Stability.

Shall be deemed to have failed when

the max. deflection exceeds L/30, where L=Clear span.

Suspended ceiling protecting steel beams: The limit of effective

protection shall be deemed to have occurred; panels become dislodged,

temp. at any beam

Door and shutter assembly Glazing :

Compliance with all the

three criteria of failure. Failure shall be deemed to have occurred if an

unobstructed gap or fissure exceeding 6mm in width by 150mm in length

exists or develops. If sustained flaming more than 10 s occurs on

unexposed face, it shall constitute failure.

Ceiling Membranes:

Compliance with Criteria of failure.


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With

reference

from :

Snippets and pictorial representations from BSI

(British Standard Institution)

DMRC Contract CE-10 CE-11 Lot 4.

Different study material from:

https://www.google.co.in

Videos: Youtube

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2. http://youtu.be/jy1SMTI8oRY
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Presentation BS 476

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