1、June 2008DEUTSCHE NORM English price group 8No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 79.040!$ONN“1444343www.din
2、.deDDIN EN 1927-3Qualitative classification of softwood round timber Part 3: Larches and Douglas firEnglish version of DIN EN 1927-3:2008-06Qualitts-Sortierung von Nadel-Rundholz Teil 3: Lrchen und DouglasieEnglische Fassung DIN EN 1927-3:2008-06SupersedesDIN V ENV 1927-3:1999-03www.beuth.deDocument
3、 comprises 11 pagesDIN EN 1927-3:2008-06 2 National foreword This standard has been prepared by Technical Committee CEN/TC 175 “Round and sawn timber” (Secretariat: AFNOR, France). The responsible German body involved in its preparation was the Normenausschuss Holzwirtschaft und Mbel (Timber and Fur
4、niture Standards Committee), Technical Committee NA 042-01-14 AA Spiegelaus-schuss zu CEN/TC 175 und ISO/TC 218 Rund- und Schnittholz. Amendments This standard differs from DIN V ENV 1927-3:1999-03 as follows: a) Prestandard DIN V ENV 1927-3 has been revised in substance. b) The content of clause 6
5、is now included in Annex A (informative) “Qualitative classification for which the intended use is known”. c) Normative references have been updated. d) In clause 3 “Terms and definitions” reference is made to standards associated with terminology. e) Some of the rules for grading specified in Table
6、s 1 and 2 have been supplemented or amended. Previous editions DIN V ENV 1927-3: 1999-03 EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 1927-3March 2008ICS 79.040 Supersedes ENV 1927-3:1998 English VersionQualitative classification of softwood round timber - Part 3:Larches and Douglas firMlzes et
7、 DouglasQualitts-Sortierung von Nadel-Rundholz - Teil 3: Lrchenund DouglasieThis European Standard was approved by CEN on 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 nationa
8、l standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be 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 o
9、ther language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia,
10、 Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES K
11、OMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1927-3:2008: EClassement qualitatif des bois ronds rsineux - Partie 3:EN 1927-3:2008 (E) 2 Contents Page For
12、eword3 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 DIN EN 1927-3:2008-06 Additional criteria 8 Annex A (informative) Qualitative classification for which the intended use is known9 EN 1927
13、-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 European Standard shall be given the status of a national standard, either by publication of an identical text or by endo
14、rsement, 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 the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for
15、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 softwood round timber: EN 1927-1, Spruces and firs EN 1927-2, Pines EN 1927-3, Larches and Douglas fir According to the C
16、EN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
17、 Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 1927-3:2008-06 EN 1927-3:2008 (E) 4 1 Scope This Standard specifies the qualitative classification for the roundwood of larches (Larix) and Douglas fir (P
18、seudotsuga). 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 intended use is unknown. Annex A gives a list of characteristics which serves as guideline for contracts describing
19、 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 this document. For dated references, only the edition cited applies. For undated references, the latest edition o
20、f 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 ti
21、mber 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 the features of round timber EN 844-9:1997, Round
22、 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 844-12:2000, Round and sawn timber Terminology Part 12: Additional terms and general index EN 1309-2, Round and sawn
23、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 EN 1311, Round and sawn timber Method of measurement of biological degrade ISO 2036, Wood for manufacture of wood
24、 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 844-5:1997, EN 844-7:1997, EN 844-8:1997, EN 844-9:1997, EN 844-10:1998 and EN 844-12:2000 apply. DIN EN 1927-3:2008-06 EN
25、 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 description of quality classes: Quality class A First quality timber. Generally corresponding to a butt log wit
26、h 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 wood. Knots are permitted to such an extent as is considered to be average for each species. Quality class C Ti
27、mber 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 wood, which, because of its characteristics, falls into none of the quality classes A, B or C. The classes
28、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 shall be made according to EN 1309-2, EN 1310 and EN 1311. This classification shall be completed with the Latin
29、 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 or LARX-B1. 1Symbols given in ISO 2036 DIN EN 1927-3:2008-06 EN 1927-3:2008 (E) 6 5 Rules for grading Table
30、 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 permitted resin pocket not permitted a1 per cross-section permitted permitted rate of growth 4 mm 7 mm un
31、limited 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 35 cm unlimited 1,5 cm/m 2,5 cm/m unlimited 35 cm unlimited 2 cm/m 4 cm/m unlimited shakes 35
32、 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 lineatum) not permitted not permitted not permitted cpermit
33、ted 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 permitted permitted in the sap area epermitted a Refer to the general description of quality classes. b Mid dia
34、meter 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 recommended. DIN EN 1927-3:2008-06 EN 1927-3:2008 (E) 7 Table 2 Grading of Douglas fir Classes Characteristics
35、 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-section permitted permitted rate of growth 8 mm 8 mm unlimited unlimited growth spiral grain 3 cm/m 7
36、 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 unlimited 35 cm unlimited 2 cm/m 4 cm/m unlimited shakes 35 cm not permitted not permitted 1/2 permitte
37、d 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 lineatum) not permitted not permitted not permitted cpermitted 2 mm (e.g. Sirex, Cerambycidae) not perm
38、itted 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 the general description of quality classes. b Mid diameter under bark. c Initial stages of Trypoden
39、dron lineatum attack permitted. d Small areas of surface rot are permitted in the area of the butt swelling. e Specific contract regulations are recommended. DIN EN 1927-3:2008-06 EN 1927-3:2008 (E) 8 6 Additional criteria In case of doubt, any externally visible or possible hidden flaws (e.g. knots
40、 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 standard. Where some characteristics of round wood of the classes A and B do not fulfil the qualit
41、y 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), rot and stain. If there is compensation for minor rot of little consequence, an agreement is
42、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. DIN EN 1927-3:2008-06 EN 1927-3:2008 (E) 9 Annex A (informative) Qualitative classification for which the in
43、tended 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 is 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. DIN EN 1927-3:2008-06
