1、STDWBSI BS EN L2249-ENGL 1999 = Lb24bb9 0799447 358 = BRITISH STANDARD Sawn timber used in pallets - Permitted deviations and guidelines for dimensions The European Standard EN 122491999 has the status of a British Standard ICs 55.180.20 BS EN 12249: 1999 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS
2、PERMITTED BY COPYRIGHT LAW STD=BSI BS EN L2249-ENGL 1977 lb24bb9 0779448 294 BS EN 12249:1999 been prepared under the direction of the Sector Amd.No. Committee for Building and C,ivil Engineering, was published under the authority of the Standards Committee and comes into effect on 15 October 1999 O
3、 BSI 10-1999 ISBN O 680 32670 5 National foreword Date Comments This British Standard is the English language version of EN 12249: 1999. The UK participation in its preparation was entrusted by Technical Committee B/W, Round and sawn timber, to Subcommittee B/543/3, Thber in pallets and packaging, w
4、hich has the responsibility to: - aid enquirers to understand the text; - present to the responsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed them in th
5、e UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitle
6、d “htedonal Standards Correspondence Index”, or by using the Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standars are responsible for their correct application. Compliance with a
7、 British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 7 and a back cover. The BSI copyright notice displayed in thic document indicates when the document was last issue
8、d. EUROPEAN STANDARD EN 12249 NORME EUROPENNE EUROPISCHE NORM June 1999 ICs 5.180.20; 79.040 English version Sawn timber used in pallets - Permitted deviations and guidelines for dimensions Bois scis utiliss dans les palettes - Ecarts admissibles et guide pour les dimensions Schnittholz in Paletten
9、- Zulssige Abweichungen und Leitfader fur Mae This European Standard was approved by CEN on 2 May 1999. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
10、Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat 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 u
11、nder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, L
12、uxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fur Normung Central Secretariat: rue de Stassart. 36 B-1050 Bmssels C 1999 CEN All rights of exploitation in any form
13、 and by any means reserved worldwide for CEN national Members. Ref. No. EN 12249: 1999 E STD-BSI BS EN 122Li9-ENGL 1999 H ib2libb7 0777450 992 m Page 2 EN 12249:1999 Con tents Page Foreword Introduction I Scope 2 Nonnative references 3 Definitions 4 Measurement 5 Changes in size due to changes in mo
14、isture content 6 Permitted deviations of cross-sections 7 Permitted deviations of lengths Annex A (informative) Recommended standard dimensions and other traditional dimensions of sawn timber used in pallets AMeX B (informative) Bibliography 6 7 Foreword This European Standard has been prepared by T
15、echnical Committee CENITC 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 endorsement, at the latest by December 1999, and conflicting national standards s
16、hall be withdrawn at the latest by December 1999. According to the CENCENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ire
17、land, Italy, Luxembourg, Netherlands, Norway, Portugal. Spain, Sweden, Switzerland and the United Kingdom. O BSI 10-1999 STD*BSI BS EN L22Li9-ENGL 1999 Lb2LibbS 0799Li53 889 Page 3 EN 12249:1999 Introduction This standard specifies permitted deviations and recommends dimensions for sawn timber used
18、in pallets. A range of cross-sections and lengths, likely to be readily available, is given to assist both producers and users. The recommended standard dimensions in Table A. 1 are the basis for this standard. Further traditional dimensions are given in Table A.2. All dimensions are given at a mois
19、ture content of 20 %. A method of calculating sizes at other moisture content levels is provided. The standard also stipulates the use of electric moisture meters for the measurement of moisture content. This reference moisture content of 20 % does not prevent manufacturers from manufacturing pallet
20、s with dry or green timber. 1 Scope This standard specifies two classes of permitted deviations (due to variability in sawing and processing) from target thicknesses, widths and lengths for timber used in pallets when measured at a defined reference moisture content”. It also recommends dimensions o
21、f sawn timber used in pallets. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, sub
22、sequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 336. Structural timber - Coniferous and poplar - Sizes, permissi
23、ble deviations. EN 844-4: 1997, Round and sawn timber - Terminology - Purt 4: Terms relating to moisture content. EN 844-6: 1997, Round and sawn timber - Terminology - Part 6: Terms relating to dimensions of sawn timber. EN i3 13-1, Round and sawn timber - Permitted deviations and preferred sizes -P
24、art i: Sofhvood sawn timber. prEN 13 183- 1, Round and sawn timber - Method of measurement of moisture content -Part I: J f, -hod for determining moisture content of a piece of suun timber (Oven-dry method). prEN i3 183-2, Round and sawn timber - Method of measurement of moisture content -Part 2: hi
25、, .:J for estimating moisture content of u piece of sawn timber (Electrical method). 3 Definitions For the purposes of this standard, the following definitions apply. 3.1 actual size size of a piece of sawn timber at the time of measurement EN 844-6: 19971 ”As for the firne being there is no standar
26、d foreceen for the supplying product, come elements are given in annex A (C BSI I O- 1999 Page 4 EN 12249:1999 3.2 moisture content mass of moisture in wood expressed as a percentage of its oven-dry mass EN 844-4: 19971 3.3 moisture content size deviation difference between an actual size and the co
27、rresponding basic size, making allowance for the difference in size due to difference in moisture content according to this standard 3.4 permitted dimensional deviations the permissible variation of the actual size (length, width andior thickness) from the referenced basic size resulting from sawing
28、 or processing 3.5 target size, basic size for the purposes of this standard, basic size and target size are the same 3.5.1 target size size desired after a particular production process (at a specified moisture content) to which the permitted deviations are related EN 844-6: I9971 3.5.2 basic size
29、size by which sawn timber is known or specified at a stated moisture content EN 844-6:1997 4 Measurement The measurement of the moisure content of individual elements shall be carried out according to prEN 13 183- 1 or prEN 13 183-2. The reference moisture content for measurements is 20 % according
30、to EN 336. 5 Changes in size due to changes in moisture content Unless there is evidence to the contrary, it shall be assumed that the thickness and width of a piece of timber increase by 0,25 % for every 1 % of moisture content from 20 YO up to 30 %, and decrease by 0,25 % for every 1 YO of moistur
31、e content below 20 YO. The above values are typical, regardless of the species. 6 Permitted deviations of cross-sections In any cross-section of each piece, the actual thickness and actual width of square-edged pieces may deviate from the target sizes (corrected to the reference moisture content of
32、20 % for changes due to changes in moisture content) by no more than as indicated in Table 1. Cl BSI 1 O- I999 STD*BSI BS EN 12247-ENGL 1999 lb24bb7 0779g53 b51 Crdon Class A +I -I +1,5 -1.5 Thickness andior width 5 100 Thickness andor width lo0 Page 5 EN 12249:1999 Class B +3 -1 +4 -2 Component len
33、gth Particular case: Blocks (all dimensions) Bearers (cross-section) +o +I -2 -3 +1.5 -1.5 +3 -2 NOTE More restrictive permitted deviations can be specified in contracts if necessary. 7 Permitted deviations of lengths Permitted deviations of lengths are given in Table 2. Deviation standardized by fi
34、nished product standards2. NOTE More restrictive permitted deviations can be specified in contracts if necessary. )See IS0 6780. 0 BSI 10-1999 Page 6 EN 12249:1999 Annex A (informative) Recommended standard dimensions and other traditional dimensions of sawn timber used in pallets Recommended standa
35、rd dimensions are given in Table A. 1. Table A.1 -Recommended standard dimensions Thicknesses I l9 1 22 Dimensions in millimetrt Widths X X X X where X the large “X denotes recommended standard dimensions. NOTE Other dimensions can also be used in national rules. Other traditional dimensions of sawn
36、 timber used in pallets are given in Table A.2. BSI 10-1999 - Page 7 EN 12249:1999 Thkknesses 15 18 22 25 32 Widths 80 1 O0 120 145 175 200 X X X X X X X X where X the large “X” indicates the most preferred cross-sectional dimensions; x the small “x” indicates other frequently used cross-sectional d
37、imensions. Preferred lengths: 600, 800, 1000, 1 200 etc. according to the modular size system3 or to other usual pallet dimensions. NOTE 1 145 mm is also used for blocks and boards. NOTE 2 Other dimensions can also be used in national rules. Annex B (informative) Bibliography IS0 6780, General-purpo
38、se flat pallets for through transit of goods -Principal dimensions and tolerances. ”See IS0 6780. 8 BSI 10-1999 12249:1999 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK
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