is 941 (1985): specification for blower and exhauster for
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है”ह”ह
IS 941 (1985): Specification for Blower and Exhauster forFire Fighting [CED 22: Fire Fighting]
IS : 941-1985(Reaffirmed 1995)
2010REAFFIRMED
o .Indian Standard
SPECIFICATION FOR BLOWERAND EXHAUSTER -FOR FIRE FIGHTING
( Second Revision)Second Reprint MARCH 2001
UDC 614.847.621.61/.63
© Copyright 1986
B U R E A U O F I N D I A N S T A N D A R D SBHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
Gr 3 February 1986
IS • 941 • 1985
Indian Standard
SPEC;::IFICATION FOR BLOWERAND EXHAUSTER FOR FIRE FIGHTING
( Second Revision)
Fire Fighting Sectional Committee, BDC 22
R,pr,smli"g
Gujarat Electricity Board, Vadodara
'fhe Institution of Fire Engineen ( India).New Delhi
Steel Authority of India Ltd (Bokaro SteelPlant ), Bokaro Steel City
Oil and Natural Ga. CommiuioD, Debra Dun
SHBI B. R. MBBTA (Al'"nt",)SHBI S. R. BANSAL
SUBIB.L.CBAUDBRYSHBI B. K. SIPPY ( Alt"ntJl, )
SBBI K. K. DAB GUPTA
Clulirmtlft
SBBI G. B. MENoN
Mnn6,rs
SBRI A. N. AHLUWALIA
Welt BeDgal Fire Services, Government of WeltBengal, Calcutta
DBPUTY IR8PBOTOB GUBRAL Ministry of Railway.(RPSF)
AsSI8T~NT SSOUBITY OJ'JrICBR(PIBB), NORTHD. R.AILWAY( Alt"""t, )
SUBI V. P. DEWAN Ministry of Defence ( DGI )LT-COLV. R. BAN~BATI (Alt,rna', )
SSBI S. K. DBBRI Municipal Corporation of Delhi (Delhi FireService ), Delhi
SHRI R. K. SHABDWAI( AII",,,It, )SURI R. R. DHOBLBY Bbabha Atomic Research Centre, BombayDIRECTOR Home Department (Fire Service ). Government
of Tamil Nadu, MadrasDBPUTY DIRECTOR ( .Al'"na" )
DIRBCTOR GBNBBAL OJ' FIB E Home (Police) Department, Government ofSERVICBS Andhra Pradesh, Hyderabad
DEPUTY DIREOTOR ( FlaBSERVIOES ) (Alt",IIJt, )
( C.,,'inUlti on pog, 2 )
C C.I!iri,M 1986• BUREAU OF INDIAN S'fANDARDS
Thil publicatioa II protected under the India" c./J.1righl Atl (XIV of 1957) andreproduction in whole or in part by any means except with written permiuion of thepublisher Iball be deemed to be an infringement of copyright under the aid Act.
IS I HI. 1985
Pvt
R,,,'s.nl'tI,MiDistry of Home AfrainCeDtral Building Rpseareb I_dtute (CSIR),
RoorkeeSteelale IDdustries Limited (Mbaimu Division),
Bombay
( C.,i,...Jr."."", 1 )
M,nt""FJRK AOVI8BRSRBJ A. K. GUPTA
SHRIJ. S.JA••JIJID~I
SBBJ C. Oil.........J ( AI,.".." )SJlBI P. K....... jay. Sbree TextU.. aDd Industria, R.ubr.SSRI S. N. KU1fDU Fire aDd Sarety Appliaacea Co, CalcuttaM.......ollN DIRlIICTOR Avon Servicel (Production & AleDcies)
Ltcl, BombayTECHNIOAL ESIIOUTlV. ( .41",,,.,,)
BalG S. A. MOBIL. MiDiatry of Defence ( R. .. D )SSRI A. K. SURI ( AI,,,,,.,, )
SRBI M. MUKBJJBJI
SBBJ P. N. PAlCCRAL
Steel Authority of India Ltd (Rourkel. SteelPlant ), Rourkela
SIIRI C. D. SBABK'" ( AI,.,,",,, )SDKI V. B. NIK.... MUDicipal Corporation of Greater Bombay
( Bombay Fire Brigade ), BombayCentral Industrial Security Force (Miniatry of
Home Aft'ain ), New DelhiSDKI P. H. SftBXA Kooverji Dev.hi and Co Pvt Ltd, Bombay
SRAI N. T. PA)lJWANI (AI,,,,..,,)SRBI Il. C. SRARX. Directorate General of Supplies aad DiIpoIall.
New Delhi
Zenith Fire Services, Bombay
Newap Industries. Surendraular { Gujarat )
Synthetics aDd Chemicals Ltd. BareillySurex Production aad Sal. ( P ) Ltd, CalcuttaDirectorate GeDeral or TecbD!cal Development,
New DelhiTarifF AdYiaory Committee, Bombay
SBBI D. S. N ( MIn." )SKRt CBAlmaAK llfT M. SHAH
SRRI M. H. SBA. (All"... )SBRJ J. V. SRAB
Ssa. B.J. SHAH ( .41,.,,,.,, )SaBI D. K. SJRKABSaal T...BIT 817.SOl SU.BIL KUllA.
SOl J. N. V A JElLS••I K. a...VI (M",..,,)
S••IS.V~A.WA.YS.al B. V. W,AGL.
Directorate General of Civil AvlatioD, New DelhiUrbaD Development, Public Health and Houling
DepanmeDt. GoveromeDt of Mabaraabtr.,Bombay
S.BI V. H. M&DKAI&Aa ( AI,.,,,.,, )S••I G. R••••, DIrector Geaeral. lSI ( &-tiJiM M",,1Mr )
Director ( Ctv Baa )
s",'MOS.BI K. M. MATJIt7a
JoiDt Director ( Cly EDa). lSI
( C.",ilUlld lin /Iill' 9 )
2
AMENDMENT- NO.1- MAY·1989TO
IS : 941- 1985 SPECIFICATION FORBLOWER AND EXHAUSTER FOR FIRE
FIGHTING
( Second Revision)
( Page 4, Table 1 ) - Insert the following Note at the end:"Non - Where it is possible to have electric supply, in place of petrol en,lne
liven at 81 No. (v) 3-phase induction motor accordinl to IS : 325 • 1978 'Specification Cor three-phase inductor motors (/ou,'" ,~'i"D")' of capAcity 2-2 kWwith or without flameproof enclosures [,e~ IS : 2148-1981 'Specification Corflameproof enclosures of electrical apparatus ( .~collJ 'e"1/on )' ] shall be used."
(BDe22 )
Pnnted at New lndll Pnntms Press. KhUl]a. India
AMENDMENT NO.2 MARCH 1993TO
IS 941 : 1985 SPECIFICATION FOR BLOWER ANDEXliAUSTER FOR FIRE FIGHTING
(Second Revision)
[ Page 4, Table 1, Sl No. (v) ] - Substitute the following for the existingmatter:
'(I) (2)
v) a) Petrol engine ofcapacity 2.5 kWwith 3 litre petroltank; or
b) uebtweight dieselengine of capacity3.23 kW
(3) (4)
IS ; 7347 - 1974:1:
IS 10001 ; 198111
tPerfonnance requirements for constant speed compression ignition (diesel) engine for general
purposes ( up to 20 kW ).'
(CED22)Printed at New India Printing Press. Khurja. India
IS 19ft • 1915
Indian StandardSPECIFICATION FOR BLOWER
AND EXHAUSTER FOR FIRE FIGHTING
( Second Revision )
o. FOREWORD
0.1 This Indian Standard ( Second Revision) was adopted by the IndianStandards Institution on 29 June 1985, after the draft finalized by the FireFighting Sectional Committee had been approved by the Civil EngineeringDivision Council.
0.2 The purpose of blower and exhauster is to provide the supply of freshclean air to firemen who may be working in unventilated places or to exhaust accumulation of foul air, fumes and smoke from storage tanb, ships'hold., godowns, living rooms and the like.
0;' This standard was first published in 1958 based on the type of equipment being imported from other countries, The fint revision had beenprepared to have the requirements based on the experience gained in themanufacture of this equipment in the country. This rev ision has been prepared so as to keep the design based on performance.
0.'- For the purpose of deciding whether a particular requirement of thisstandard is complied with, the final value, observed or calculated, expreaing the result of a test or analyail, shall be rounded off in accordance withIS :2 • 1960·. The number of significant places retained in the rounded off value should be the same as that of the specified value in thisstandard.
I. SCOPE1.1 This standard laya down the requirements regarding material, construction and performance of blower and exhauster used for fire fighting.
2. DESCRIPTION2.1 The blower and exhauster shall consist of the following parts:
a) Impeller,b) Casing,
• Rul~1 for roundiDg oft'Dumerical value. ( ,"';,111 ).
3
III HI -1985
c) Suction mouth with wire fabric,d) Exhaust pipe,e) Engine, andf) Frame with lifting handles.Aluminium castings shall have a minimum thickness of 4 mm and
aluminium sheet wherever used shall have a minimum thickness of2·Smm.
3. MATERIAL
3.1 The material used for the various parts shall be as given in Table 1.
IS :1239 (Part I) ...1979§
IS : 4948·197411
Aluminiurn
MS pipe
Aluminium
Can"a.Exhaust pipePetrol eugine or capacity2-5 kW with 3 litre petrol
t.DkFraIne with lifting handl"
Suction mouth
eaaiDIii)
vi)
iii)
iv)v)
TABLE I REQUIREMENTS OF THE MA.TERIALS OF COMPONENTS
SL No. NAn o. P.AKTS NAIQ 0., MATIeRIAL COKrOB.ING TO
(1) (2) (3) (4)i) Impeller Aluminium Grade 4429 of
IS : 617-1975-Grade 4423 ofIS : 617-1975.Grade 4423 ofIS :617-1975-IS : 1424-1977t
IS : 7347·1974~
vii) Wire fabric steel Steel
-SpecificatloB for alumiDium aDd aluminium alloy ingot. and castings for generaleqiDeeriD, purpotes ( ",.1Ul ,1fIiIi." )•
. t~peCi&catiOD for cottOIl caDV" ( ,NGntl rl,i"i"" ).~Speci&catioD for performauce of amall .ize spark ignition engines.§Speci&catioD for mild steel tubes, tubulars, and other wrought steel fittings: Part 1
Mild Iteel tulJea <f"'" ,,,;n," ).IISpecificatioD for welded atee! wire fabric for general use (first "vision ).
4. CONSTRUCTION".1 Impeller and engine shall be mounted together and the total weight ofthe unit with fuel shall Dot exceed 60 kg. Runner shall be of the overhungtype to mount correctly and securely on the extension of the engine ahaft.The detail. shall be as given in Fig. 1.
S. PERFORMANCE REQ,UlREMBNT
5.1 The blower shall be tested accordingly to method given in 5.1.1to 5.1.3, after removing the guard. The blower shall be capable ofdischarging safely and continuously 30 m3/minute of free air.
4
IS . 941 • 1985
IMPELLER
750 max
CASING'"
LIFTINGHANDLE -
WIRE FABRICSTEEL MESH--..........
SUCTIONMOUTH - _
&PRING
EXHAUSTsa175 min
llf TlNG HANDLE
- EXHAUST (TO BEfITTED WITHCANVAS PIPE)
All dimensions in mil limetres.
ItJG. 1 DETAILS OF Bl.OWEn. AND EXHAUSTER
5
181 "1.1985
5.1.1 To the inlet side of the blower attach a cylindrical airway of diameter D not less than 1·5d where d is the diameter oforifice in which theimpeller rotates (I" Fig. 2A ). To the inlet aide of the airway shall befitted a conical mouthpiece of length D/4 having an included angle of 60degrees converging towards the blower, and a radial flange at itl inlet endof width D/25. The total length of the test duct including the conical mouth.piece shall not be less than 2D.
'-------20 -----...
d. ORIFICE DIA
AIR
VELOCITYMEASURED HERE
Flo.2A ROUND TasTINo DUCT POR PROPELLER FANS
5.1.2 The average air velocity shall be determined by readings of a vaneanemometer from measurements across a section D from the fan end of thecylindrical airway.
5.1.3 For the air delivery teat, the cylindrical airway shall be consideredto be divided into a number of equal square areas by lines parallel to thediameter D as shown in Fig. 2B. Measurements shall be taken with thecentre of the anemometer vane wheel at the centre of each area, as shownin the Fig. 2B. The number of areasshall be determined by the ratio ofD to the diameter of the ring iurrounding the anemometer vanes, the relationship being shown in the table under Fig. 2B.
6. OPERATIONAL TEST6.1 Blower and exhauster shall be run continuously tor 2 hours It shallremain stable and ahall not move from its place by more than 30 em, Allthe components shall be checked and there ahall not be any looseDell.
7. ftNlSB7.1 All parts shall be of good finish, clear of burrs and sharp edges. Allcasting shall be clean and sound and shall be free from plugging, weldingor repair of any defects.
is I 941 • 1985
.....---------- 0
Diameu of AirwllYD
S"btlivision ofEach Diamet,r
n
Numb" ofRltldings
4- - Diameter of anemometer3 55 97 139 17
MaTRons OP DIVIDING TilE AREA OP AIRWA.Y
4 and above but lell than 5t/15 and above bu t lesl thao 8~8 and above but Ie. than 15~1S; or greater
Flo.2B
8. PAINTING8.1 Blower and exhauster except engine shall have two coats of paint afterone coat of red oxide primer. The shade of paint for stand shall be blackfor body, fire red conforming to Shade No. 536 of IS : 5 • 1978·. Paintused shall be in accordance with IS : 2932.1974t·
• Specification for colours for ready mixed paints and enamels ( third r,,,;sion ).t Sp~cification for enamel, synthetic extr-rior (a) under coating, (h) finishing (first
"Dision ).
1
f$ I 9tl • 1985
9. MARKING
9.1 Each blower and exhauster shall be clearly and permanently markedwith the following information:
a) Manufacturer's name or trade-mark, and
b) Year of manufacture.
9.1.1 The product may also be marked with Standard R18rk.
9.1.2 The use of the Standard Mark is governed by the provisions of theBureau of Indian Standards Act, 1986 and tbe Rules and Regulations madethereunder. The details of conditions under which the licence for the use ofStandard Mark may be granted to manufacturers or producers may be obtainedfrom tbe Bureau of Indian Standards.
10. CRITERIA FOR CONFORMITY
10.1 Each equipment shall be checked for the requirements given in thisstandard.
8
IS I 941 • 1985
( C.nti".,dj,om /Jtll,2 )
Fire Fighting Units Subcommittee, DDe 22 : 3
ConDen,rSDRI P. N. GHOSH
In personal capacity ( ]-1916, Chitttlranjan Ptlrk,Neu: D,lhi )
Mlml"s R,/Wes,nli"g
SUBI MAHB8H C. AORAWAL Brijbas] Udyog, Mathur.SURI P. S. BANEI\JElC ( All,rna', )
SUBI A. CUA'f'rOPAUJlYAY The Institution of Fire Engineer. (India),New Delhi
SRRI K. K. UA80UPTA West Bengal Fire Services, CalcuttaSBBI V. P. DEWAN Ministry of Defence ( DGI )
LT-COI" V. R. BANAHA'rl ( Altlrntlt, )SUBI S. K. DJlEIU Municipal Corporation of Delhi (Delhi Fire
Service) , Delhi
Municipal Corporation of Greater Bombay( Bombay Fire Brigade), Bombay
Reliable ( Fire Protection) Industries, BombayAir Foam Industries Pvt Ltd, New Delhi
SUUI B. V. WAGLE
SSRI H. M. SABADK.\
SRBI K. K. SAWHNEYSHRI R. MEHTA ( Alternate)
SUBI P. H. SETHNA Kooverji Devshi Be Co ( P ) Ltd, BombaySURI N. T. PANJWANI ( Alt,rnat, )
SURl D. K. SIRKAlt Synthetics and Chemicals Ltd, BareillySURI S. VENKASW,\MY Directorate General of Civil Aviation,
New DelhiUrban Development, Public He-alth and Housing
Department, Government of Maharashtra,Bombay
SURI V. H. MADKAIKAU (All"ntll,)
SnBI R. K. BHARDWAJ ( Al'"nat, )FIBB ADVI8ER Ministry of Home AffairsBRIG S. A. MONILE Ministry of Defence ( R&D)
SUBI A. K. SURI ( Alternat« )SSBI V. B. NIKAJI
Panel for Blowers and Exhauster, BDC 22 : 3/P-l
SUBI S. P. BINDBA Industrial Safety Engineers, New Delhi
lJ
BUREAU OF INDIAN STANDARDS
Heed,,.,,.,.:Manak Bhaven, 9 Bahadur Shah zafar Marg, NEW DELHI 110002Telephones 323 013', 323 3375, 323 9402Fax 9111 3234062, 9111 3239399, 9111 3239382
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Gangat,., Complex 5th Floor, Bhadbhada Road, T T Nagar BHOPAL 462003
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Kal8Ikath.r BUildings, 670 AVlnashl Road, COIMBATORE 641037
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Savltr, Complex, 116 G T Road GHAZIABAD 201001
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Seth Bhawan, 2nd Floor, BehInd Lee.a C,nema, Naval K,shore Road,LUCKNOW 226001
Pathputra Industrial Estate, PATNA 800013
T C No 14/1421, UniverSity P 0 Palayam,THIRUVANANTHAPURAM 695034
NIT BUilding, Serond Floor, Gokulpat MarK8t, NAGPUR 440010
Insbtubon of Engineers ( India) Building, 1332 ShlVSjI Nagar, PUNE 411005
550 13 48
83949 65
55 40 21
403627
21 01 41
&-28 88 01
8-71 19 96
54 11 37
20 10 83
372925
21 68 76
23 89 23
26 23 05
6 21 17
52 51 71
32 36 35
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tSales Office IS at Novelty Chambers, Grant Road, MUMBAI 400007
*Sales Office IS at F' Block, Unity BUilding NarashimarBj8 Square,BANGALORE 560002
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Prtnted at New India Printing Press KhurJ8. India
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