1、BRITISH STANDARDBS EN 1927-3:2008Qualitative classification of softwood round timber Part 3: Larches and Douglas firICS 79.040g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60
2、g53g44g42g43g55g3g47g36g58BS EN 1927-3:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 May 2008 BSI 2008ISBN 978 0 580 56624 0National forewordThis British Standard is the UK implementation of EN 1927-3:2008. It supersedes DD ENV 1927-
3、3:1999 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee B/543, Round and sawn timber.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisi
4、ons of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 1927-3March 2008ICS 79.040 Supersedes EN
5、V 1927-3:1998 English VersionQualitative classification of softwood round timber - Part 3:Larches and Douglas firClassement qualitatif des bois ronds rsineux - Partie 3 :Mlzes et DouglasQualitts-Sortierung von Nadel-Rundholz - Teil 3: Lrchenund DouglasieThis European Standard was approved by CEN on
6、23 February 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may b
7、e obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Ma
8、nagement Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Nor
9、way, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form an
10、d by any means reservedworldwide for CEN national Members.Ref. No. EN 1927-3:2008: EEN 1927-3:2008 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Qualitative classification for which the intended use is unknown.5 5 Rules for grading .6 6 Additional crit
11、eria 8 Annex A (informative) Qualitative classification for which the intended use is known.9 BS EN 1927-3:2008EN 1927-3:2008 (E) 3 Foreword This document (EN 1927-3:2008) has been prepared by Technical Committee CEN/TC 175 “Round and sawn timber”, the secretariat of which is held by AFNOR. This Eur
12、opean Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2008, and conflicting national standards shall be withdrawn at the latest by September 2008. Attention is drawn to the possibility that some of th
13、e elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document will supersede ENV 1927-3:1998. EN 1927 consists of the following parts with the main title Qualitative classification of sof
14、twood round timber: EN 1927-1, Spruces and firs EN 1927-2, Pines EN 1927-3, Larches and Douglas fir According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Cz
15、ech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 1927-3:2008EN 1927-3:2008 (E) 4 1 Sco
16、pe This Standard specifies the qualitative classification for the roundwood of larches (Larix) and Douglas fir (Pseudotsuga). The classification is made either using Clauses 4 and 5 or using informative Annex A. Clauses 4 and 5 describe the qualitative classification of round timber for which the in
17、tended use is unknown. Annex A gives a list of characteristics which serves as guideline for contracts describing qualities for round timber of larches and Douglas fir where the intended use is known. 2 Normative references The following referenced documents are indispensable for the application of
18、this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 844-1:1995, Round and sawn timber Terminology Part 1: General terms common to round timber and sawn timber EN 844-2:1997,
19、Round and sawn timber Terminology Part 2: General terms relating to round timber EN 844-5:1997, Round and sawn timber Terminology Part 5: Terms relating to dimensions of round timber EN 844-7:1997, Round and sawn timber Terminology Part 7: Terms relating to anatomical structure of timber EN 844-8:19
20、97, Round and sawn timber Terminology Part 8: Terms relating to the features of round timber EN 844-9:1997, Round and sawn timber Terminology Part 9: Terms relating to features of sawn timber EN 844-10:1998, Round and sawn timber Terminology Part 10: Terms relating to stain and fungal attack EN 844-
21、12:2000, Round and sawn timber Terminology Part 12: Additional terms and general index EN 1309-2, Round and sawn timber Method of measurement of dimensions Part 2: Round timber Requirements for measurement and volume calculation rules EN 1310, Round and sawn timber Method of measurement of features
22、EN 1311, Round and sawn timber Method of measurement of biological degrade ISO 2036, Wood for manufacture of wood flooring Symbols for marking according to species 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 844-1:1995, EN 844-2:1997, EN 844-5:199
23、7, EN 844-7:1997, EN 844-8:1997, EN 844-9:1997, EN 844-10:1998 and EN 844-12:2000 apply. BS EN 1927-3:2008EN 1927-3:2008 (E) 5 4 Qualitative classification for which the intended use is unknown The qualitative grading has four classes: A, B, C and D. The grading is based on the following general des
24、cription of quality classes: Quality class A First quality timber. Generally corresponding to a butt log with clear timber, without defects or with only minor defects and with few restrictions to its use. Quality class B Timber of average to first quality, with no specific requirements for clear woo
25、d. Knots are permitted to such an extent as is considered to be average for each species. Quality class C Timber of average to low quality, allowing all quality characteristics which do not seriously reduce the natural characteristics of the wood. Quality class D Timber which can be sawn into usable
26、 wood, which, because of its characteristics, falls into none of the quality classes A, B or C. The classes are defined more precisely in Table 1 and Table 2. All the listed qualitative characteristics in Table 1 and Table 2 shall be taken into account when a class is assigned, and measurements shal
27、l be made according to EN 1309-2, EN 1310 and EN 1311. This classification shall be completed with the Latin name of specified species. The abbreviation of this Latin name can also be used instead of the full name. EXAMPLE 1 Douglas fir: Pseudotsuga class B or PSES-B1. EXAMPLE 2 Larch: Larix class B
28、 or LARX-B1. 1Symbols given in ISO 2036 BS EN 1927-3:2008EN 1927-3:2008 (E) 6 5 Rules for grading Table 1 Grading of Larches Classes Characteristics A B C D knots intergrown, sound not permitteda 5 cm 8 cm permitted dead not permitted a 3 cm 7 cm permitted unsound not permitted not permitted 3 cm pe
29、rmitted resin pocket not permitted a1 per cross-section permitted permitted rate of growth 4 mm 7 mm unlimited unlimited growth spiral grain 3 cm/m 7 cm/m 10 cm/m unlimited eccentric pith 10 % 20 % unlimited unlimited sweep b 35 cm 1 cm/m 1,5 cm/m 2,5 cm/m 4,5 cm/m 35 cm 1,5 cm/m 2 cm/m 3 cm/m 4,5 c
30、m/m taper 35 cm unlimited 1,5 cm/m 2,5 cm/m unlimited 35 cm unlimited 2 cm/m 4 cm/m unlimited shakes 35 cm not permitted not permitted 1/2 permitted heart shakes (except checks) b 35 cm 1/4 1/3 1/2 permitted ring shakes b 35 cm not permitted not permitted not permitted 1/2 35 cm not permitted 1/4 1/
31、3 1/2 insect attack 2 mm (e.g. Trypodendron lineatum) not permitted not permitted not permitted cpermitted 2 mm (e.g. Sirex, Cerambycidae) not permitted not permitted not permitted small-scale attack permitted rot not permitted not permitted not permitted d permitted stain not permitted not permitte
32、d permitted in the sap area epermitted a Refer to the general description of quality classes. b Mid diameter under bark. c Initial stages of Trypodendron lineatum attack permitted. d Small areas of surface rot is permitted in the area of the butt swelling. e Specific contract regulations are recomme
33、nded. BS EN 1927-3:2008EN 1927-3:2008 (E) 7 Table 2 Grading of Douglas fir Classes Characteristics A B C D knots intergrown, sound not permitted a 5 cm 8 cm permitted dead not permitted 4 cm 7 cm permitted unsound not permitted not permitted 4 cm permitted resin pocket not permitted a1 per cross-sec
34、tion permitted permitted rate of growth 8 mm 8 mm unlimited unlimited growth spiral grain 3 cm/m 7 cm/m 10 cm/m unlimited eccentric pith 10 % 20 % unlimited unlimited sweep b 35 cm 1 cm/m 1,5 cm/m 2,5 cm/m 4,5 cm/m 35 cm 1,5 cm/m 2 cm/m 3 cm/m 4,5 cm/m taper b 35 cm unlimited 1,5 cm/m 2,5 cm/m unlim
35、ited 35 cm unlimited 2 cm/m 4 cm/m unlimited shakes 35 cm not permitted not permitted 1/2 permitted heart shakes (except checks) b 35 cm 1/4 1/3 1/2 permitted ring shakes b 35 cm not permitted not permitted not permitted 1/2 35 cm not permitted 1/4 1/3 1/2 insect attack 2 mm (e.g. Trypodendron linea
36、tum) not permitted not permitted not permitted cpermitted 2 mm (e.g. Sirex, Cerambycidae) not permitted not permitted not permitted small-scale attack permitted rot not permitted not permitted not permitted d permittedstain not permitted not permitted permitted in the sap areaepermitted a Refer to t
37、he general description of quality classes. b Mid diameter under bark. c Initial stages of Trypodendron lineatum attack permitted. d Small areas of surface rot are permitted in the area of the butt swelling. e Specific contract regulations are recommended. BS EN 1927-3:2008EN 1927-3:2008 (E) 8 6 Addi
38、tional criteria In case of doubt, any externally visible or possible hidden flaws (e.g. knots under buckles, overgrown shakes, stripping damage) shall be laid bare and the revealed flaws assessed according to the quality specifications. Foreign bodies (e.g. shrapnel) are not dealt with in this stand
39、ard. Where some characteristics of round wood of the classes A and B do not fulfil the quality criteria on agreement, they can be compensated by higher quality in other characteristics. Generally, the following characteristics cannot be compensated: insect attack (especially Trypodendron lineatum),
40、rot and stain. If there is compensation for minor rot of little consequence, an agreement is necessary. Each log can be graded either in a single class or in more than one class by using theoretical crosscut points. The minimum length accepted for a theoretical crosscut point is 3 m. BS EN 1927-3:20
41、08EN 1927-3:2008 (E) 9 Annex A (informative) Qualitative classification for which the intended use is known The following list of characteristics should be considered for contracts where the intended use is known. EN 1309-2, EN 1310 and EN 1311 shall be used as a reference. NOTE The following list i
42、s not exhaustive. Additional characteristics may be considered. butt swelling; eccentric pith; foreign body; insect attack; knots; rate of growth; reaction wood; resin pocket; rot; shakes; spiral grain; stain; sweep; taper; tapping cut; undercut. BS EN 1927-3:2008BS EN 1927-3:2008BSI389 Chiswick Hig
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