1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 1316-2:2012Hardwood round timber Qualitative classificationPart 2: PoplarBS EN 1316-2:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation o
2、f EN 1316-2:2012. Itsupersedes BS EN 1316-2:1997 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/543, Round and sawn timber.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purp
3、ort to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 69387 8ICS 79.040Compliance with a British Standard cannot confer immunity fromlegal obligations.Th
4、is British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2013.Amendments issued since publicationDate Text affectedBS EN 1316-2:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1316-2 October 2012 ICS 79.040 Supersedes EN 1316-2:1997Engl
5、ish Version Hardwood round timber - Qualitative classification - Part 2: Poplar Bois ronds feuillus - Classement qualitatif - Partie 2: Peuplier Laub-Rundholz - Qualitts-Sortierung - Teil 2: Pappel This European Standard was approved by CEN on 18 August 2012. CEN members are bound to comply with the
6、 CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management
7、 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 translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status a
8、s the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Ne
9、therlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of ex
10、ploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1316-2:2012: EBS EN 1316-2:2012EN 1316-2:2012 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Qualitative classification .44.1 Grading principles .44.2 Designat
11、ion of grades .44.3 Features to be taken into account for the classification .55 Table of rules for grading .6BS EN 1316-2:2012EN 1316-2:2012 (E) 3 Foreword This document (EN 1316-2:2012) has been prepared by Technical Committee CEN/TC 175 “Round and sawn timber”, the secretariat of which is held by
12、 AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2013, and conflicting national standards shall be withdrawn at the latest by April 2013. Attention is drawn to the possibility that so
13、me of the 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 supersedes EN 1316-2:1997. This standard is one of a series of standards concerning round timber (softwoods and hardw
14、oods). Other parts of this standard are: EN 1316-1, Hardwood round timber Qualitative classification Part 1: Oak and beech The main changes compared to the previous edition are: a) Clause 4 “qualitative classification” completely revised and classes A to C defined; b) Table 1 “grading rules for popl
15、ar” revised and new features added; c) Editorial revision. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
16、Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 1316-2:2012EN 1316-2:2
17、012 (E) 4 1 Scope This European Standard specifies a qualitative classification and grade designations for felled round timber of poplar in the form of long poles or logs. The classifications describe quality classes of round timbers for which the intended use is not known. This classification is ap
18、plicable to all merchantable clones of poplar. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition
19、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, Round and sawn timber Terminology Part 2: General terms relating to round timber EN 844-5:1997, Round and sawn t
20、imber 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 844-8:1997, Round and sawn timber Terminology Part 8: Terms relating to features of round timber EN 844-10:1998, Round a
21、nd sawn timber Terminology Part 10: Terms relating to stain and fungal attack EN 1309-2, Round and sawn timber Method of measurement of dimensions Part 2: Round timber Re-quirements for measurement and volume calculation rules EN 1310, Round and sawn timber Method of measurement of features EN 1311,
22、 Round and sawn timber Method of measurement of biological degrade 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 844-5:1997, EN 844-7:1997, EN 844-8:1997 and EN 844-10:1998 apply. 4 Qualitative classification 4.1 Gradin
23、g principles Each long pole, log or portion of a round timber individualized by a theoretical crosscut point, is qualified according to its dimensions and to the presence, size, and distribution (e.g. concentration) of specific features. 4.2 Designation of grades Standardized designation of classes
24、includes 3 characters, the last one separated by a dash: BS EN 1316-2:2012EN 1316-2:2012 (E) 5 the first and second characters are the genus initial and first letter in Latin; the third character indicates the quality class. The classification of poplar is divided into three quality classes: Po-A is
25、 an exceptional quality class; Po-B is a normal quality class; Po-C is a quality class, which includes long poles, logs or portions of long poles not permitted in the other quality classes. For class Po-C, more than 40 % of the volume of the wood shall be useable. 4.3 Features to be taken into accou
26、nt for the classification Table 1 gives the features taken into account in this classification and these shall be measured according to EN 1309-2, EN 1310 and EN 1311. A long pole, log or portion of round wood shall be downgraded by its failure to meet the requirements of any single feature. Length
27、and diameter shall be measured using the method stated in EN 1309. A culling may be specified by contract for the following features: bark pocket, burl, buckle, felling shake, shear, dote, rot, canker, carbonized wood, scar, foreign bodies, mistletoe, bird peck, dry side. BS EN 1316-2:2012EN 1316-2:
28、2012 (E) 6 5 Table of rules for grading Table 1 Grading rules for Poplar Features Class Po-A Po-B Po-C (1) dimension minimum length2,5 mb2 mb2 mbminimum mid dia- meter under barka30 cmb25 cmb20 cmb(2) sound knots 1 ( 6 cm) per 2,5 mc1 ( 12 cm) per 1 m; or 1 branch whorl per 2 m (every single knot 8
29、cm) 12 cm permitted (3) unsound knots not permitted not permitted 1 ( 12 cm) per 1 m (4) simple sweep 2 cm/m 5 cm/m unlimited (5) ovality 10 % unlimited unlimited (6) heart shake no traversing cracks length of the crack on the surface shall be smaller than half of the mid diameter permitted (7) ring
30、 shake not permitted permitted in the central 15 % of the radius on the butt end only permitted in the central 15 % of the radius on the butt end only (8) frost crack not permitted not permitted permitted (9) rot not permitted not permitted not permitted (10) insect attack not permitted not permitte
31、d permitted acontractors need to agree on a bark reduction bexcept clauses stipulated by contract cnot permitted for veneer logs This page deliberately left blankBSI is the independent national body responsible for preparing British Standards and other standards-related publications, information and
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