SIST-TS CEN/TS 12169:2008

Criteria for the assessment of conformity of a lot of sawn timber

This document defines the sampling plans and procedures for inspection by attributes (measurable properties) of sawn timber lots exhibiting a homogenous distribution of characteristics. It also gives control regulations and conditions for conformity or non conformity of a lot in view of the agreed specification.
This document applies to any sawn timber products claimed to comply with specifications defined in the sales contract.
It does not cover the spread of different qualities within a grade or between the contracted grades.
In case of a dispute, a sampling carried out only by customer or supplier is not valid as it cannot be guaranteed to be free from manipulation. Furthermore parties    are free to enlarge the sampling or make use of another method provided an agreement is made between the interested parties.

Kriterien zur Konformitätsprüfung eines Loses SchnittholzKriterien

Dieses Dokument legt Stichprobenahmepläne und -verfahren zur Überprüfung durch Merkmale (messbare
Eigenschaften) von Schnittholzlosen fest, die eine gleichmäßige Verteilung der Eigenschaften aufweisen. Sie
enthält außerdem Prüfanweisungen und Bedingungen für die Konformität oder Nicht-Konformität eines Loses
im Hinblick auf die vereinbarte Spezifikation.
Dieses Dokument ist anwendbar auf Schnittholzprodukte, für die davon ausgegangen wird, dass sie die in
einem Kaufvertrag definierten Spezifikationen erfüllen.
Es umfasst nicht die Überprüfung der Verteilung von verschiedenen Qualitäten innerhalb einer Handelsklasse
oder zwischen den vertraglich vereinbarten Güteklassen.
Im Streitfall ist eine Stichprobenahme, die allein vom Abnehmer oder allein vom Lieferanten durchgeführt
wurde, nicht bindend, da eine manipulationsfreie Stichprobenahme nicht immer nachgewiesen werden kann.
Darüber hinaus ist es möglich, den Stichprobenumfang zu vergrößern oder ein anderes Stichprobenahmeverfahren
anzuwenden, sofern eine entsprechende Vereinbarung zwischen den Beteiligten getroffen wurde.

Critere de vérification de la conformité d'un lot de bois scié

Le présent document définit les plans d’échantillonnage et les procédures pour le contrôle par attributs (propriétés mesurables) de lots de bois sciés montrant une distribution homogène des caractéristiques. Il précise aussi les descriptions de contrôle et les conditions de conformité ou non-conformité d’un lot par rapport à une spécification donnée.
Le présent document s’applique à tous bois sciés devant satisfaire à des spécifications définies dans un contrat de vente.
Il ne permet pas de juger la dispersion des différentes qualités dans un choix ou entre les différents choix objet du contrat.
A.1   En cas de litige, un échantillonnage n’est pas valable s’il a été effectué uniquement par le client ou le fournisseur car on ne peut pas toujours vérifier qu’il n’a pas fait l’objet de manipulations. Par ailleurs, les parties sont libres d’élargir l’échantillonnage ou d’utiliser une autre méthode à condition qu’il y ait accord entre les intéressés.

Merila za ugotavljanje skladnosti partije žaganega lesa

General Information

• Status: Published
• Publication Date: 01-Jun-2008
• ICS: 79.040 - Wood, sawlogs and sawn timber
• Technical Committee: LES - Round and sawn timber
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 08-Mar-2008
• Due Date: 13-May-2008
• Completion Date: 02-Jun-2008
• Ref Project: CEN/TS 12169:2008 - Criteria for the assessment of conformity of a lot of sawn timber

Relations

• Replaces: SIST ENV 12169:2003 - Criteria for the assessment of conformity of a lot of sawn timber
• Effective Date: 01-Jun-2008

Overview

CEN/TS 12169:2008 - "Criteria for the assessment of conformity of a lot of sawn timber" - defines statistically based sampling plans and inspection procedures for assessing conformity of sawn timber lots. Intended for lots with a homogenous distribution of characteristics, the Technical Specification establishes how to inspect by attributes (conforming / non‑conforming pieces), how to apply Acceptable Quality Levels (AQL), and how to decide whether a lot meets contractual specification or should be rejected.

Keywords: CEN/TS 12169:2008, sawn timber, sampling plans, conformity assessment, AQL, inspection by attributes, lot inspection, ISO 2859-1.

Key Topics

• Scope and applicability
  • Applies to any sawn timber product claimed to meet sales-contract specifications.
  • Does not cover variability of qualities within or between grades.
• Statistical basis
  • Uses sampling procedures indexed by AQL as defined in ISO 2859-1.
  • If AQL is not specified in contract, AQL 10 applies by default.
• Sampling rules
  • Minimum number of packages to open is specified (Table 1); samples must be randomly selected so neither party can bias selection.
  • The first test piece in each opened package is selected at random in the top layer; subsequent selection follows a defined scanning frequency (layers scanned left-to-right).
  • Optionally, top layer may be excluded by mutual agreement when it’s protective packaging.
• Inspection procedures
  • Single sampling: fixed sample sizes and maximum allowed non‑conforming pieces (see Table 2).
  • Double sampling: initial smaller sample and, if results fall in an “uncertain” zone, a second sample is taken; combined results determine conformity (see Table 3). Double sampling can reduce total inspections for most lots.
• Decision rules
  • Conformity is decided by comparing the number of non‑conforming pieces to table limits (A = acceptance limit; R = rejection limit).
  • Sampling performed solely by one party is not valid in disputes due to possible manipulation.

Applications

• Practical for timber producers, buyers, merchants, quality managers, inspection bodies, and contract administrators who need objective lot acceptance/rejection criteria.
• Useful at shipping, receiving, customs inspection, and dispute resolution where contract compliance must be demonstrated.
• Helps optimize inspection effort (single vs double sampling) while maintaining statistical confidence in lot decisions.

Related standards

• Normative reference: ISO 2859-1 (Sampling procedures for inspection by attributes).
• Supersedes ENV 12169:2000 and was prepared by CEN/TC 175 (Round and sawn timber).

Use CEN/TS 12169:2008 to implement consistent, statistically founded lot inspection processes for sawn timber and to reduce disagreements by relying on agreed sampling and decision rules.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2008
1DGRPHãþD
SIST ENV 12169:2003
Merila za ugotavljanje skladnosti partije žaganega lesa
Criteria for the assessment of conformity of a lot of sawn timber
Kriterien zur Konformitätsprüfung eines Loses SchnittholzKriterien
Critere de vérification de la conformité d'un lot de bois scié
Ta slovenski standard je istoveten z: CEN/TS 12169:2008
ICS:
79.040 Les, hlodovina in žagan les Wood, sawlogs and sawn
timber
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION
CEN/TS 12169
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
January 2008
ICS 79.040 Supersedes ENV 12169:2000
English Version
Criteria for the assessment of conformity of a lot of sawn timber
Critères de vérification de la conformité d'un lot de bois scié Kriterien zur Konformitätsprüfung eines Loses Schnittholz
This Technical Specification (CEN/TS) was approved by CEN on 22 October 2007 for provisional application.
The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their
comments, particularly on the question whether the CEN/TS can be converted into a European Standard.
CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available
promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)
until the final decision about the possible conversion of the CEN/TS into an EN is reached.
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, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 12169:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3
Introduction .4
1 Scope.5
2 Normative references.5
3 Terms and definitions .5
4 Conformity control.6
4.1 Objective.6
4.2 Principle.6
4.3 Applicable AQL.6
4.4 Type of inspection .6
5 Sampling.6
5.1 Sampling rules.6
5.2 Single procedure.7
5.2.1 Single sampling.7
5.2.2 Double sampling.9

Foreword
This document (CEN/TS 12169:2008) has been prepared by Technical Committee CEN/TC 175 “Round and
sawn timber”, the secretariat of which is held by AFNOR.
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 identifying any or all such patent rights.
This document supersedes ENV 12169:2000.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria, Cyprus, Czech
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.
Introduction
The purpose of this document is to define an inspection system for a lot of sawn timber. This document uses
statistical sampling plans found in ISO 2859-1.
1 Scope
This document defines the sampling plans and procedures for inspection by attributes (measurable properties)
of sawn timber lots exhibiting a homogenous distribution of characteristics. It also gives control regulations
and conditions for conformity or non conformity of a lot in view of the agreed specification.
This document applies to any sawn timber products claimed to comply with specifications defined in the sales
contract.
It does not cover the spread of different qualities within a grade or between the contracted grades.
In case of a dispute, a sampling carried out only by customer or supplier is not valid as it cannot be
guaranteed to be free from manipulation. Furthermore parties are free to enlarge the sampling or make use
of another method provided an agreement is made between the interested parties.
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 of the referenced
document (including any amendments) applies.
ISO 2859-1, Sampling procedures for inspection by attributes – Part 1: Sampling plans indexed by acceptable
quality level (AQL) for lot-by-lot inspection.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
lot of sawn timber
a number of sawn timber pieces of the same thickness and width and the same quality grade
NOTE A lot of sawn timber can be, for example:
 package of sawn timber,
 truckload, a wagon load or shipload of sawn timber,
 pile of sawn timber,
 kiln load.
3.2
acceptable Quality Level (AQL)
the maximum percentage of non-conforming pieces of sawn timber that can be considered satisfactory as a
process average
3.3
non-conforming piece
a piece which fails to meet the quality requirements
3.4
package
a part of a homogeneous lot
4 Conformity control
4.1 Objective
The objective of the inspection is to determine with a high probability whether the lot does not conform to the
specifications fixed in the contract and a complaint seems to be justified. Hence the decision is between
"conformity" and "nonconformity".
4.2 Principle
The control of the lot is carried out on the basis of attributes. The pieces making up the sample are defined as
"conforming" or "nonconforming". The decision regarding conformity or nonconformity of the lot is made on the
basis of the number of nonconforming pieces in comparison to the total number of the pieces in the sample.
In the case of simultaneous assessme
...