IS 11770-2: Recommendations for control of emission of asbestos dust in premises manufacturing products containing asbestos, Part 2: Friction materials

2006·1.1 MB·English

by  Bureau of Indian Standards

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IS 11770-2 (2006): Recommendations for control of emission
of asbestos dust in premises manufacturing products
containing asbestos, Part 2: Friction materials [CED 53:
Cement Matrix Products]
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IS 11770 (Pati 2) :2006

Indian Standard
RECOMMENDATIONS FOR CONTROL OF EMISSION
OF ASBESTOS DUST W PREMISES MANUFACTU~G
PRODUCTS CONTA~~G ASBESTOS
PART 2 FRICTION MATERIALS
(First Revision)
,....
Ics 13.040.40

@BIS 2006
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
Janua~ 2006 Price Group 2
Cement Matrix Products Sectional Committee, CED 53
FOREWORD
This Indian Standard (Part 2) (First Revision) was adopted by the Bureau of Indian Standards, afier the draft
finalized by the Cement Matrix Products Sectional Committee had been approved by the Civil Engineering
Division Council
This standard was first published in 1986 considering that exposure to asbestos dust can have harmfil effects on
the health of workers. In order to give guidelines on how the risk of exposure to asbestos dust can be prevented,
controlled or minimized, itwas felt necessa~ to laydown some standards regarding safe useof different -products
containing asbestos, improving conditions in work places, preventing measures, protection of health of workers,
packaging and transport of asbestos, disposal of asbestos waste, etc.
This standard layingdown the recommendation for control ofemission ofasbestos dust inpremises manufacturing
products containing asbestos wasprepared inthree parts. This Part 2ofthe standard laysdowntherecommendations
for control ofemission ofasbestos dust inpremises manufacturing friction materials, soasto ensure asafeworking
environment. Recommendations for control of emission of asbestos dust in premises manufacturing asbestos
cement products and non-cement asbestos products other than friction materials are covered in Parts 1 and 3
respectively of this standard. In this revision, engineering control measures for dust control have been elaborated.
Storage, transportation, mixing practice have also been enhanced to further minimize the hazard.
In the formulation of this standard, due weightage has been given to international co-ordination among the
standards and practices prevailing in different countries inaddition to relating itto the practices inthe field inthis
country. This has been met by deriving assistance from ‘IL.OCode ofpractice: Safety inthe use ofasbestos’, 1984
published by Intematiorial Labour Organization, Geneva.
IS 11770(Part 2) :2006
Indian Standard
RECOMMENDATIONS FOR CONTROL OF EMISSION
OF ASBESTOS DUST ~ PREMISES MANUFACTU~G
PRODUCTS CONTA~ING ASBESTOS
PART 2 FRICTION MATERIALS
(First Revision )
L
-1 SCOPE control shall be adopted to eliminate ortominiml~e the
This standard (Part 2) lays down the recommendations asbestos dust concentration inthe working environment
for control of emission of asbestos dust in premises to the lowest possible level.
usedformanufacturing friction materials using asbestos.
4.2 Control Measures
2 REFERENCES Inany process of use of asbestos fibres or inthe use of
Thefollowingstandardscontainprovisions whichthrough any materials containing asbestos where dust may be
referenceinthistext,constituteprovisions ofthisstandard. givenoff,engineering control measuresshouldbedevised
At the time of publication, the editions indicated were to prevent the emission of asbestos dust into the work
valid. All standards are subject to revision and parties place.
to agreements based onthis standard are encouraged to
investigate the possibility of applying the most recent 4.2.1 Control at the Source
editions of the standards indicated below : Control of dust shall be achieved as near the source as
possible. This increases the efficiency of the control
IS No. Title process, minimizes costs and prevents the spread of
dust into adjacent areas. This will prevent the
11767:1986 Recommendations for cleaning of
environmental hazard and hazard is.Iimited only to the
premises and plants using asbestos
work place. Therefore, if enclosure of the s-ource is
fibres
possible, this shall be the froststep to be taken.
11768: 1986 Recommendations for disposal of

asbestos waste material
4.2.2 Local Exhaust Ventilation System

12078: 1987 Recommendations for personal
protection of workers engaged in 4.2.2.1 Local exhaust ventilation system shall include
handling asbestos the following (see Fig.1):
12079: 1987 Recommendations for packing, a) HoodEnclosure — Optimum enclosure and
transport and storage of asbestos collection of airborne dust.
12080:1987 Recommendations for local exhaust b) Duct work— Connects the hoods andenclosures
ventilation systems in premises to a common duct. The duct in turn connects to
manufacturing products containing a dust collector.
asbestos
c) Dust collector — This effects separation of dust
particles from the air.
3 OBJECT
d) Fan — Moves the dust laden air to the dust
The object ofthis standard istorecommend procedures
collector.
thatshallbeadopted inpremises used formanufacturing
ofasbestoscontaining friction materials soastominimize 4.2.2.2 To control the dust effectively, the exhaust
andcontrol the emission ofasbestos dust inthe working ventilation shall belocated asclosetothe source ofdust
environment for the safety of workers. emission by the use of hoods, booths or enclosures.
4 GENERAL REQUIREMENTS 4.2.2.2.1 Hoods
Capture-type of hood is commonly used to collect the
4.1 All appropriate and practicable measures of dustfromalocalized-dust source intothesystemthrough

engineering control, work practice and administrative which it is finally collected.
1
IS11770(Part 2) :2006 n
Fan
*-of motive
p, Wdy on
t clmed air sideofdust
deer. Falterairto
A
Source of dust generated
If Dispersed = Nuisance
% &Hzard
->>
Jt
0,
“b
Collected dust
discharge
( /
/
FIG. 1 TYPICALELEMENTSOFA LOCALVENTILATINGSYSTEM
,.,,
4.2.2.2.2 Enclosure of booth @pe d) Proper use of personal protective equipment,
wherever required (see IS 12078).
Inside which the dust produced is contained as it is
generated and so designed to prevent the dust escaping
4.3.2 Use of WetMethods
into work place.
a) Application of fine spray directed at the source
4.2.2.3 The local exhaust syste m s shall be designed of dust, such as a cutting tool, saw, drilling,
through proper duct work to remov e all dust laden air material deposited on the floor, etc.
(see IS 12080). b) The spray shall not create any dust.
c) Careshallbetaken tocollect andproperly dispose
4.2.2.4 Openings inthe enclosures shall be assmall as
the wet material (see IS 11768).
possible while still allowing access to necessary work
d) Wettinginthepresence oflocalexhaustventilating
operations.
systems is not recommended.
4.3 Work Practices
5 RECOMMENDED CONTROL FORDIFFERENT
Appropriate work practices shall be identified,
OPERATIONS
standardized andfollowed forallworkplaces,operations,
processes where asbestos dust is likely to escape into
5.1 Storage,Transportation andHandling ofAsbestos
the atmosphere.
5.1.1 Fibre
4.3.1 Work practices include:
For packaging, transport and storage of asbestos
a) Requirements tousemd maintain proper process
recommendations asgiven in IS 12079shallbeadopted.
machinery, installations, equipment, tools, local
exhausts and ventilation systems. 5.1.2 ~pe of Bag
b) Wetting where such process is applicable. Asbestos fibres shall be always packed in impermeable
c) Regular clean up of any waste generated during woven and coated or lined polythene or polypropylene

manufacturing by appropriate method. bags.
2
IS 11770(Part 2) :2006
5.1.3 Packing leaving only an adequate opening in the front. This
Plastic material used for bags shall incorporate anultra- front shall also have aremovable cover. The cover shall
violet inhibitor to protect the bags from sunlight and remain closed during fibrization.
radiation.
677 Mixing
“----
5.1.4 Storage a) All the powder material shall be weighed under
effective ventilation.
a) Allunitsshallbecarefully inspectedforcleanliness
and for damage. ‘b) Mixing operation shall be carried outwithproper
dust control-systems toprevent anydust escaping
b) All damaged bags shall be repaired immediately.
into atmosphere.
c) Allunits having loose asbestos or other debris on c) Mix shall be kept inclosed containers. Mix shall
them shall be cleaned as soon as possible by bemoved to other processes inclosed containers.
vacuum or by some other means which causes no
d) Dry mixing operations shall be undertaken only
secondary dust generation.
in enclosed systems under negative pressure.
e) mere wet mix or plasticized materials are used
5.2 Fibre Preparation and Mixing
in open systems, waste and dried out residues
shall be clear~d by vacuum cleaning equipment
5.2.1 Automatic debagging machine should beused for
or by other dustless methods.
effective dust control, where practicable.
5.3 Transfer of Mixed Compound to Moulding and
Debagging mayalsobe carried outbyhand withproperly
Forming
designed hood. This consists of atable and covered by
a hood (see Fig.2). The hood shall cover all sides, 5.3.1 ~erever practicable totally enclosed systems
TO EXHAUST
t
LIGHT INSIDE
HOOD
7 fi
‘“2mRuB’ER*
TO EXHAUST

111
SHREDDER WI,<
‘1</111
CHAM8ER TO
—
TAKE Ft8RE BAGS
4– HOPPER CONNECTED
SCREW FEED, CHUTE
OPEN GRILL WORK
sff ELF (UNDER HOOD) <
u ‘>
7.?.Jq
~~v.%”
FIG.2 TYPICM DEBAGGINGHOOD

3
..
IS 11770@art 2) :2006 a.
shall be provided for transferring compounds from the thickness and drilled with holes for fastening to brake
mixing area to the processing machine~. shoes.
5.3.2 All mix and preform containers shall always be 5.6.2 In all the above operations, properly designed
kept closed while moving within the processing area. hoods with required capture velocity to be maintained,
so that all the dust generated during the operations is
-5.3.3 All transfer operation shaIl be carried out with captured.
proper enclosure and sufficient face velocity to be
maintained (10 tisec/m2) to prevent any dust escaping 5.6.3 Inspection of finished components for quality
in to the atmosphere. control purposes shall be carried out ontables equipped
with a dust extraction system.
5.4 Preforming
5.6.4 Finished products shall be suitably packed before
5.4.1 Weighing and transferring operations shall be despatch without any dust.
carried out under controlled conditions with negative
pressure. 5.7 Reclamation of Materials
5.4.2 Vacuum provision shall be made to clean the 5.7.1 Disintegrators, milling machinery or grinding
spillage immediately. plant used to reclaim waste material shall operate inan
enclosed booth under proper ventilation system.
5.4.3 Pressing operations shall be carried out with
negative pressure. Properly designed hoods shall be in 5.7.2 Reclaimed material shall be transferred back in
place to prevent dust escaping into atmosphere. The to the process either automatically with in an enclosed
hood shall be directly connected to the press. system.
5.4.4 The space of the press that houses the piston and 5.7.3 Left out reclaimed material shall be disposed
the base for mould shall be completely enclosed and of in accordance with the provisions laid down in
connected to the hood. IS 11768.
..
5.4.5 When mix with potential to release airborne 6 GENERAL VENTILATION
asbestos dust are intransit from one machine section to
another during processing they shall be conveyed in 6.1 Adequate fresh air shall be provided in addtiion
closed systems or containers. to the exhaust ventilation requirements.
5.5 Hot Pressing and Curing 6.2 Necessary air pollution control equipments shall
be installed to meet the regulatory requirements.
5.5.1 Allprefoms shallbemoved inaclosed container.
7 CLEANING OF PLANT AND PREMISES
5.5.2 Preforms shall be handled carefilly into the hot
7.1 The work premises shall be kept free from
press.
asbestos waste and dust. All plant, machinery, exhaust
ventilation equipment and all internal surfaces of the
5.5.3 Afierhotpressoperation, thematerial istransferred
to curing section. building shall be kept free from dust. Vacuum cleaning
equipment or other dustless methods, such as wetting,
5.5.4 Asbestos fibre is locked into the cured resin. before and during sweeping, should be used for thi-s
-Fibrewill not be released during handling. purpose. Cleaning shall be done inaccordance with the
provisions laid down in IS 11767. t
5.6 Finishing Operations
8 DISPOSAL OF WASTE
5.6.1 During finishing operations, themould pieces are All waste material shall be disposed of in accordance
cuttoproper dimensions, shaped andground torequired with the provisions laid down in IS 11768.

4
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This Indian Standard has been developed from Doc :No. CED 53 (7199).
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
,.,,.
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