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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:
20-08-2014
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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
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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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