Table Of Contentइंटरनेट मानक
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IS 5246 (2000): Coniferous logs - [CED 9: Timber and Timber
Stores]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
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IS 5246:2000
Indian Standard
CONIFEROUS LOGS — SPECIFICATION
( First Revision)
Ics 79.040
0 BIS2000
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
Octgber 2000 Price Group 3
Timber SectionalCommittee, CED9
FOREWORD
This Indian Standard (First Revision) was adopted bythe Bureau of Indian Standards, after the draft finalized by
the Timber Sectional Committee had been approved bythe Civil Engineering Division Council.
Specification forconfireous sawn timber intended forfurther conversion iscovered inIS 1909:1991 ‘Specification
for coniferous sawn timber ( baulks and scant]ings ) (Jiurth revision )’; in order to select suitable logs for such
sawntimber, itisfelt bythe Timber Sectional Committee, that forconiferous logsanIndian Standard should alsobe
prescribed so that for such sawn timber suitable logs could be selected. This standard is formulated to give the
minimun requirements ofthe three grades of coniferous logs, which are intended for further revision.
Intheformulation ofthis standard dueweightage hasbeengiven to international co-ordination among the standards
and practices prevailing indifferent countries inaddition to relating itto the practices inthe field inthis country.
This standard was first published in 1969. Based on the experience gained, two amendments were issued to this
standard. Besides incorporating these amendments, the evaluation ofdefects hasbeen brought inlinewith IS3364
(Part 1): 1976 ‘Methods ofmeasurement andevaluation ofdefects intimber: Part 1Logs (jkst revision ~’inthis
revision.
This standard contains 7.1 which permits the purchaser to use his option for selection to suit his requirements at
thetime ofplacing orders.
The Committee responsible for the preparation ofthis standard isgiven atAnnex A.
For the purpose of deciding whether a particular requirement of this standard iscomplied with, the final value,
observed orcalculated, expressing theresult ofatestofanalysis, shallberounded off inaccordance with 1S2:1960
‘Rules forrounding off numerical values (revised)’. The number ofsignificant places retained inthe rounded off
value should be the same asthat of the specified value inthis standard.
IS5246:2000
Indian Standard
CONIFEROUS LOGS — SPECIFICATION
( First Revision)
1 SCOPE Grade3 — 12minordefectsor3majorand6minor
defects
Thisstandard covers the requirements ofthree grades
of coniferous logs, that is, Grade 1, Grade 2 and 5 SPECIES
—“
Grade 3,forconversion into timber.
The logsshallbeofthe species oftimber listedbelow:
2 REFERENCES Trade Name Botanical Name Abbreviation
The following standards contain provisions which Fir Abies pindrow Royle FIR
through reference in this text, constitute provision
Deodar Cedrus deodara D. Don DEO
ofthisstandard. Atthetimeofpublication, theeditions
indicated were valid. All standards are subject to Cypress Cupressus torulosa D. Don CYP
revision, and parties to agreements based on this
Spruce Picea Smithiana 130iss SPR
standard areencouraged to investigate thepossibility
of applying the most recent editions ofthe standard Kail Pinus excelsa Wall KAL
indicated below:
Khasi Pine Pinus Khasya Royle KPI
ISNo. Title
Chir Pinus Roxburghii Sargent CHR
707:1976 Glossaryoftermsapplicabletotimber
6 GENERALREQUIREMENTS
technology and utilization (second
revision ) The logs shall be free from hollow centre above
15percent of the basal area of the log, spiral grain,
1141:1993 Code of practice for seasoning of
any kind ofdecay (rot ), insect attack and any other
timber (second revision) defects ( except those permitted in 8). The hollow
3364(Part 1): Method of measurement and centre throughout the length of the log shall not be
1976 evaluation of defects in timber : permitted.
Part 1Logs (first revision) 7 DIMENSIONSANDMEASUREMENT
3 TERMINOLOGY 7.1 Dimensions
3.1 For the purpose of this standa rd the definitions The logs shall be of the following dimensions:
given inIS707 and the following sha ll apply.
Minimum length 2.5m
3.2 Crack
Minimum meanmid-girth 100cm
An actual rupture of the wood tissues, that is a
NOTE — Dimensionsoflogslessthantheabovemay
separation ofthe fibres inthe longitudinal direction.
bepermitted,if so, desired bythepurchaser.
3.3 Hollow Centre 7.2 Measurement
Alog issaidto beaffected with hollow centre, when Themeasurementoflengthandgirthandthecalculation
itscentreheart(pith)ispartiallyorcompletelyremoved of volume of logs shall be made as in7.2.1 to 7.2.3.
with orwithout partial removal ofthe heart wood.
7.2.1 Length
4 GRADES
Itshall be taken as the shortest distance in metres
The coniferous logsshallbeclassified inthreegrades, from one extreme end tothe other. The length shall
namely Grade 1,Grade 2andGrade 3,onthebasis of be rounded off to the nearest lower 0.05 m.
permissible defects as shown against each grade of
7.2.2 Mean Girth
logs for every 2.5 m length.
Inalogofregulartaper,themeangirthshallbemeasured
Grade 1— 6minordefectsor2majorand2minor
at the mid-length of a log but not over the bark or
defects
any protuberances. The girth shall be measured in
Grade2 — 9minor defectsor3majorand3minor centimetres and rounded off to the nearest lower
defects centimetre.
1
IS5246:2000
7.2.2.1 Inalogofirregular taper, threemeasurements ofthe log:
shall be taken, that isone near the mid-length and at
a) The total length of the longest No defect
each end but not over the bark or any protuberance,
splits upto 125mm
the mean girth being obtained bytaking the average
ofthese measurements. b) The total length of the longest A minor
splits over 125mm and up to defect
7.2.2.2 Ifgirth measurements aretaken overthebark,
190mm
adeduction of 10percent ofmean girth, shallbemade
from the mid-girth on account ofthe bark. c) The total length of the longest A major
splits over 190mm and up to defect
7.2.3 Volume
250mm
Thevolume of logs shall becalculated bythequarter
8.1.4 Surface Cracks
“ girth formula, as given below, the volume shall be
expressed in cubic metre correct to three decimal Thedepth ofanycrack shall not exceed 50mmatany
places : place on alog.
2
[1
V= : XL 8.1.5 Cup Shakes (Ring Shakes)
where a) A cup/ring shake visible only A minor
on one end and located within defect
V = Volumeinm’,
50 mm from the centre heart
G = Girth inm,and
(pith) of a log
L = Length inm.
b) A cup/ring shake visible on Two minor
8 PERMISSIBLE DEFECTS INLOGS ANDTHEIR
both the ends and located defects
EVALUATION
within 50mm from the centre ( for each
8.1 Defects to the extent, specified below, shall be heart (pith) of a log end )
permissible; plugging of defects shall not be
c) Acup/ring shake visible only A major
permissible. All defects shall be measured as in
on one end and whose length, defect
IS3364( Part 1).
when measured along the arc,
8.1.1 Lack of Straightness exceeds230mm
For every 2.5 m length of the log measured from its 8.1.6 Knots
butt end:
a) Live knots measuring up to No defect
a) Adeviation up to25 mm f r om No defect 75mmindiameter
the straight
b) Live knots measuring over A minor
b) Adeviation over 25 mm and A minor 75mmandupto 100mm india- defect
upto 50mm from the straight defect meter and occurring not more
than 6 innumber ina length of
c) Adeviation over 50mm and A major 2.5m
upto 100mm from the straight defect
c) Live knots measuring over A major
8.1.2 Taper 100mm and up to 125mm in defect
diameter and occurring not more
For every 2.5 m length of the log measured from its
than 6 innumber inalength of
butt end:
2.5m(seeNote )
a) Ataper up to 200 mm No defect
d) Dead knots measuring up to No defect
b) Ataper over 200 mm and upto A minor 75mm indiameter andoccurring
250mrn defect not more than 2 in number in
alength of2.5 m
c) Ataper over 250 mm and upto A major
3oomm defect e) Dead knots measuring over A minor
75 mm and up to 125 mm in defect
8.1.3 End Splits
diameter and occurring not more
The longest endsplit at each end shall be measured than 4 innumber ina length of
andthelengthsaddedtogether. Forevery2.5mlength 2.5m
2
1S5246:2000
Dead knots measuring over A major and upto 150mm indiameter
125mmandupto 150mm india- defect
9 ENDCOATING
meter and occurring not more
than 4 innumber ina length Toprotectandtominimize endcracking, splitting, etc,
of 2.5m the ends of each log shall be adequately coated, up
toadistanceofatlea; 125mm,with‘myofthematerials
NOTE—Liveknotsmeasuringover 150mm andup
mentioned in1S1141. Application ofend coating on
to250 mm indiameter andoccurring not morethan2
innumbershallbeallowed, providedtheyarenotnearer the logs shall be done soon after the inspection of
than2.0 m from the butt end of alog. the log.
8.1.7 Hollow Centre 10 MARKING
—..
a) Not more than 10percent of the A minor 10.1 Each log shall be legibly and indelibly marked
basal area of the log and not defect at suitable place, preferably at the ends, to indicate
extending throughout the length the following:
of the log
a) Abbreviation of the species,
b) More than 10 percent but not A major
b) Supplier’s identification mark and the year of
above 15 percent of the basal defect
supply,
area of the log and not extending
throughout the length of the log c) Length and mean girth of the log, and
8.1.8 Wounds d) Grade.
Wounds shall not be numerous or so grou~ed or
located as to affect unduly the yield on~on~ersion
andusefulness ofthe sawn material. For thepurpose 10.2 BISCertification Marking
ofthis standard, wounds shall beclassified asunder:
10.2.1 Eachlogmayalsobemarked withtheStandard
a) Wounds upto 25 mm indepth No defect Mark.
and upto 50mm indiameter
10.2.2 The useof Standard Mark isgoverned bythe
b) Wounds over 25 mm and upto A minor provision oftheBureau ofIndian Standards Act, 1986
40mmindepth andupto 75mm defect and the Rules and Regulations made thereunder.
indiameter Details of conditions under which a Iicence for the
use of the Standard Mark may be granted to the
c) Wounds over 40 m and upto A major
manufacturers orthe producers maybe obtained from
50mm indepth and over 75mm defect
the Bureau of Indian Standards.
ANNEX A
(Foreword)
COMMI’ITEECOMPOSITION
T nberSectionalCommittee, CED9
Chairman
SHRISHYAMSUNDER
29891D, 2th Main,HAL11Stage,Bangalore560008
Members Representing
SHRIA. K.ANANTHANARAYANA Institute of Wood Science andTechnology, Bangalore
SHRIMATBI. S. KAMALA(Alternate )
SHRIANILAGARWAL Ministry ofDefence, Directorate of Standardization, New Delhi
SHRIH.C. PANT(Alternate )
SHRIS. M.AGARWAL WIMCOLtd,New Delhi
SHR[B. B. GARG(Alternate )
SHRiA. K.BANSAL IndianPlywoodIndustriesResearch&TrainingInstitute,Bangalore
SHRIK. DAMODARA(NAlternate )
SHRIG. P.BADOLA Forest Department, Government of Madhya Pradesh, Bhopal
SHRIATULKHERA(Alternate )
SHRIA. K.CHAI-J-ERJEE Directorate General of Technical Development, New Delhi
SHRIO. P.SHARMA(Alternate )
CHIEFCONSERVATOOFRFORESTS Forest Department, Government of UttarPradesh, Lucknow
ADDITIONACLHIEFCONSERVATOOFRFOREST(SAlternate )
CHIEFCONSERVATOOFRFORESTR HimachalPradeshForestDepartment,Simla
CONSERVATOOFRFOREST(SAhernate )
CHIEFCONSERVATOOFRFOREST(SGENERAL) Forest Department, Government of Karnataka, Bangalore
DIRECTO(RTRACK) MinistryofRailways,NewDelhi
JOINTDIRECTORC,E(TM )(Alternate )
DIRECTOR ForestResearchInstitute,DebraDun
DEPUTYDIRSCTOORFNAVALARCHITEC TURE Naval Headquarters, New Delhi
ASSISTANDTIRECTOORFNAVALARCHITECTU(RAEfternate )
SHRIERAPPA The KarnatakaState Forest Industries Corporation Limited,
Bangalore
SHRtS. K.CHAKRABOR(TAIhernate )
DRR. GNANAHARAN KeralaForestResearch Institute, Peechi
INSPECTOGRENERAOLFFORESTS Ministry of Environment and Forests, New Delhi
ADDITIONAILNSPECTOGRENERALOFFOREST(SAlternate )
.!hmDt. B. JAIN Directorate General of Supplies &Disposal, New Delhi
SHRIDARBARASINGH(Alternate )
SHRID. K. KANUNGO National TestHouse, Calcutta
SHRIB. K.MANDAL(Alternate )
SHRIS. KUMAR Andaman Chamber of Commerce & Industry, Port Blair
SHRIS. C. MALHOTR(AAlternate )
SHRIP.T.S. MENON Indian Plywood Manufacturing Co Ltd, Mumbai
SHRIB.A. MATHEWS Forest Department, Andaman &Nicobar Islands, PortBlair
SHRIA. MUKHERJEE Directorate of Standardization, New Delhi
SHR[A. K.AGARWA(LAlternate )
(Continued onpage 5)
4
IS 5246:2000
(Continuedfiom page 4)
Members Representing
DRA. N. NAYER Inpersonal capacity ( C-59 Inderpuri, New Delhi 110012 )
SHRIR.C.PRASAD Bihar State Forest Development Corporation Ltd, Patna
SHRIB. M. PRASAD(Alternate )
PRESIDENT FederationofIndianPlywood and PanelIndustry,NewDelhi
EXECUTIVDEIRECTO(RAfternate )
SHRIS. S. RAJPUT Convener,TimberTerminology andClassification Subcommittee,
CED9:1; TimberTestingSubcommittee,CED 9:9; and Timber
Conversion andGrading Subcommittee, CED 9:10
SHRIB. B. SHAMBARKAR Engineer-in-Chief’s Branch, New Delhi
SHRiA. K.AGARWA(LAlternate )
SHRIS. N. SHARMA Convener, TimberSeasoning andTreatment Subcommittee, CED
9:3
SHRIK.S. SJNJKLA Forest Research Institute, Forest Products Division, Debra Dun
SHRIN. M.WALSCHA Directorate General of Civil Aviation, New Delhi
SHRIANANDPRAKASH(Alternate )
SHRJS. S. SETHJ, DirectorGeneral,BIS (Ex-officio Member)
Director (Civ Engg )
Member-Secretary
SHRIMATRIACHNASEHGAL
Deputy Director (Civ Engg ), BIS
Timber Conversion and Grading Subcommittee, CED 9:10
Convener
SHRIS. S. RAJPUT ForestProductsDivision,ForestResearchInstitute,DebraDun
Member
SHRIA. K.ANANTHANARAYANA Institute of Wood Science andTechnology, Bangalore
SHRIMATBI. S. KAMALA(Alternate )
SHRIS. P.J3AOONI Forest Research Institute, DebraDun
SHRIJ.L. B~NDOPADHYAY DirectorateofPostsandTelegraph,NewDelhi
CHIEFCONSERVATOOFRFORESTS ForestDepartment,GovernmentofUttarPradesh,Lucknow
ADDITIONACLHIEFCONSERVATOOFRFOREST(SAfternate )
CHIEFCONSERVATOOFRFORESTS HimachalPradeshForestDepartment,Shimla
CONSERVATOOFRFOREST(SAlternate )
CHIEFCONSERVATOOFRFORESTS Forest Department, Government of West Bengal, Calcutta
CONSERVATOOFRFOREST(SAlternate )
SHR[K. DAMODARAN IndianPlywoodIndustriesResearch&TrainingInstitute,Bangalore
SHRIH.GURUVAREODY(Akrnute )
DIRECTO{RTRACK) Ministry of Railways, New Delhi
JOINTDIRECTO(RTM )(Alternate )
SHR[G. L. DUA RuralElectrification Corporation Ltd, New Delhi
SHRIM.A.AZEEZ(Alternate )
DRR. GNANAHARAN KeralaForestResearch Institute, Peechi
(Continued onpage 6)
5
