Chimneys - Components - Concrete outer wall elements

This European Standard specifies the material, dimensional and performance requirements for factory made precast concrete outer wall elements for chimneys including outer wall fittings.
This European Standard covers elements having up to four passages designated to accommodate a combination of flue liners and/or ventilation passages.
This European Standard also relates to storey-height and reinforced outer wall elements.
This European Standard does not apply to structurally independent (freestanding or self-supporting) chimneys constructed using these outer wall elements.
NOTE   Any reference to the term "outer wall element" implies both the outer wall elements and their fittings, except where otherwise indicated.

Abgasanlagen - Bauteile - Außenschalen aus Beton

Diese Europäische Norm legt die Werkstoffe, Maße und Leistungsanforderungen für werkseitig hergestellte Außenschalen aus Fertigbeton für Abgasanlagen, einschließlich Außenschalenformstücken fest.
Diese Europäische Norm beschreibt Außenschalen mit bis zu vier Durchgängen, die eine Kombination aus Innenrohren und/oder Lüftungsdurchgängen aufnehmen können.
Diese Europäische Norm gilt auch für geschosshohe und bewehrte Außenschalen.
Diese Europäische Norm gilt nicht für strukturell unabhängige (freistehende oder freitragende) Abgasanlagen, die unter Verwendung dieser Außenschalen errichtet wurden.
ANMERKUNG   Der Begriff „Außenschalen“ bedeutet in dieser Norm immer „Außenschalen und deren Formstücke“, es sei denn, er ist ausdrücklich anders bezeichnet.

Conduits de fumée - Composants - Enveloppes externes en béton

La présente Norme européenne spécifie les exigences relatives aux matériaux, aux dimensions et aux
performances, pour les enveloppes externes de conduits en béton préfabriquées en usine, y compris les
accessoires des enveloppes externes.
Cette Norme européenne s’applique aux éléments ayant jusqu’à quatre canaux conçus pour s’adapter aux
combinaisons de conduits intérieurs et/ou de passages de ventilation.
Cette Norme européenne s’applique également aux enveloppes externes hauteur d'étage et aux enveloppes
externes armées.
La présente norme ne s'applique pas aux conduits de fumée structurellement indépendants (autostables ou
auto-portants) construits à l'aide de ces enveloppes externes.
NOTE Toute référence au terme « enveloppe externe » implique l’ensemble des enveloppes externes et leurs
accessoires, sauf indication contraire.

Dimniki - Sestavni deli - Betonski elementi plašča dimnika

Ta evropski standard določa zahteve glede materiala, mer in zmogljivosti za tovarniško narejene montažne betonske elemente plašča dimnika za dimnike, vključno z vodili na zunanji steni. Ta evropski standard zajema elemente, ki imajo do štiri prehode za namestitev kombinacije oblog za dimne cevi in/ali prehodov za prezračevanje. Ta evropski standard je prav tako povezan z višino nadstropja in ojačanih zunanjih zidnih elementov.

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Status
Published
Publication Date
21-Jun-2011
Current Stage
9093 - Decision to confirm - Review Enquiry

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Abgasanlagen - Bauteile - Außenschalen aus BetonConduits de fumée - Composants - Enveloppes externes en bétonChimneys - Components - Concrete outer wall elements91.100.30Beton in betonski izdelkiConcrete and concrete products91.060.40Dimniki, jaški, kanaliChimneys, shafts, ductsICS:Ta slovenski standard je istoveten z:EN 12446:2011SIST EN 12446:2011en,fr,de01-oktober-2011SIST EN 12446:2011SLOVENSKI

STANDARD
SIST EN 12446:2011
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12446
June 2011 ICS 91.060.40 Supersedes EN 12446:2003English Version
Chimneys - Components - Concrete outer wall elements
Conduits de fumée - Composants - Enveloppes externes en béton

Abgasanlagen - Bauteile - Außenschalen aus Beton This European Standard was approved by CEN on 25 May 2011.

CEN members are bound to comply with the 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 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 as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, 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:
Avenue Marnix 17,

B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12446:2011: ESIST EN 12446:2011

EN 12446:2011 (E) 2 Contents Page Foreword ..............................................................................................................................................................41 Scope ......................................................................................................................................................52 Normative references ............................................................................................................................53 Terms and definitions ...........................................................................................................................54 Materials .................................................................................................................................................74.1 General ....................................................................................................................................................74.2 Reaction to fire .......................................................................................................................................75 Reinforcement for handling ..................................................................................................................76 Surface treatment ..................................................................................................................................77 Form, dimensions and tolerances .......................................................................................................87.1 Form ........................................................................................................................................................87.2 Dimensions .............................................................................................................................................87.3 Tolerances ..............................................................................................................................................87.4 Squareness of ends ...............................................................................................................................88 Performance ...........................................................................................................................................98.1 Heat stress resistance ...........................................................................................................................98.2 Heat shock resistance ........................................................................................................................ 108.3 Thermal resistance ............................................................................................................................. 108.4 Compressive strength ........................................................................................................................ 108.5 Bulk density ......................................................................................................................................... 108.6 Freeze-thaw resistance ...................................................................................................................... 108.7 Flexural strength under wind loading .............................................................................................. 118.8 Gas tightness of passages used for combustion air ...................................................................... 118.9 Resistance to fire external to external .............................................................................................. 118.10 Dangerous substances ...................................................................................................................... 119 Designation ......................................................................................................................................... 129.1 Designations and classes .................................................................................................................. 129.2 Temperature classes .......................................................................................................................... 129.3 Pressure class application ................................................................................................................ 129.4 Soot fire resistance class .................................................................................................................. 129.5 Distance to combustible materials ................................................................................................... 129.6 Manufacturer’s information class ..................................................................................................... 1310 Marking ................................................................................................................................................ 1311 Product information............................................................................................................................ 1312 Evaluation of conformity .................................................................................................................... 1412.1 General ................................................................................................................................................. 1412.2 Initial type testing ............................................................................................................................... 1412.3 Further type tests................................................................................................................................ 1412.4 Factory production control ................................................................................................................ 14Annex A (normative)

Test methods ................................................................................................................ 16 Heat stress resistance and heat shock test ..................................................................................... 16A.1 16 Apparatus ............................................................................................................................................ 16A.1.1 16A.1.2 Test assembly ..................................................................................................................................... 16SIST EN 12446:2011

EN 12446:2011 (E) 3 A.1.3 Test environment and conditioning .................................................................................................. 19A.1.4 Procedure ............................................................................................................................................. 20A.1.5 Test results .......................................................................................................................................... 21A.2 Flexural strength under wind load ..................................................................................................... 21A.2.1 Principle................................................................................................................................................ 21A.2.2 Preparation of test specimen ............................................................................................................. 21A.2.3 Test procedure ..................................................................................................................................... 21A.3 Gas tightness test ............................................................................................................................... 22A.3.1 Apparatus ............................................................................................................................................. 22A.3.2 Test environment and conditioning .................................................................................................. 22A.3.3 Procedure ............................................................................................................................................. 22A.3.4 Result .................................................................................................................................................... 23Annex B (normative)

Requirements of sampling plan according to ISO 2859-1 at an Acceptable Quality Level (AQL) and inspection level S2 Inspection Procedure .............................................. 24B.1 Acceptability determination ............................................................................................................... 24B.1.1 General ................................................................................................................................................. 24B.1.2 Single sampling ................................................................................................................................... 24B.1.3 Double sampling .................................................................................................................................. 24B.2 Normal inspection ............................................................................................................................... 24B.3 Reduced Inspection ............................................................................................................................ 26B.4 Reduced to normal inspection ........................................................................................................... 26B.5 Tightened inspection .......................................................................................................................... 26B.6 Tightened to normal inspection ......................................................................................................... 27B.7 Discontinuation of inspection ............................................................................................................ 27Annex ZA (informative)

Clauses of this European Standard addressing the provisions of the EU Construction Products Directive ....................................................................................................... 28ZA.1 Scope and relevant characteristics ................................................................................................... 28ZA.2 Procedure of attestation of conformity of concrete outer wall elements ...................................... 29ZA.2.1 System of attestation of conformity .................................................................................................. 29ZA.2.2 EC Certificate and Declaration of conformity ................................................................................... 31ZA.3 CE Marking and labelling .................................................................................................................... 31Bibliography ...................................................................................................................................................... 34 SIST EN 12446:2011

EN 12446:2011 (E) 4 Foreword This document (EN 12446:2011) has been prepared by Technical Committee CEN/TC 166 “Chimneys”, the secretariat of which is held by ASI. 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 2011, and conflicting national standards shall be withdrawn at the latest by March 2013. 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 EN 12446:2003. The main modifications to EN 12446:2003 are: a) a revised table of heat flow values for thermal performance testing which now includes values for high pressure applications, e.g. diesel generators, b) a test method for the evaluation of Flexural strength under wind loading (clause 8.7 and Test methods clause A.2), c) a requirement to evaluate the gas tightness of passages used for combustion air (clause 8.8 and Test methods clause A.3), d) a requirement relating to the Resistance to fire from an external source (clause 8.9), e) a requirement relating to the Release of dangerous substances (clause 8.10). This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s) 89/106/EEC, see informative Annex ZA, which is an integral part of this document. This standard is one of a series of co-ordinated standards dealing with specification, design, testing and installation of chimneys, both single and multi wall. The co-ordinated package of standards is further divided by material of construction and this European Standard is one of a series of specifications and execution documents dealing with design and installation of concrete chimney products and systems. The standards in this series for concrete chimney products and systems are: EN 1857, Chimneys — Components — Concrete flue liners EN 1858, Chimneys — Components — Concrete flue blocks EN 12446, Chimneys — Components — Concrete outer wall elements 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, Croatia, 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. SIST EN 12446:2011

EN 12446:2011 (E) 5 1 Scope This European Standard specifies the material, dimensional and performance requirements for factory made precast concrete outer wall elements for chimneys including outer wall fittings. This European Standard covers elements having up to four passages designated to accommodate a combination of flue liners and/or ventilation passages. This European Standard also relates to storey-height and reinforced outer wall elements. This European Standard does not apply to structurally independent (freestanding or self-supporting) chimneys constructed using these outer wall elements. NOTE Any reference to the term "outer wall element" implies both the outer wall elements and their fittings, except where otherwise indicated. 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. EN 1443:2003, Chimneys — General requirements EN 1857:2010, Chimneys — Components — Concrete flue liners EN 1858:2008, Chimneys — Components — Concrete flue blocks EN 10088-2:2005, Stainless steels — Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes EN 10218-2, Steel wire and wire products — General — Part 2: Wire dimensions and tolerances EN 14297:2004, Chimneys — Freeze-thaw resistance test method for chimney products ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1443:2003 and the following apply. 3.1 outer wall fitting outer wall element such as access openings, offsets 3.2 concrete material formed by mixing cement, coarse and fine aggregate and water and with or without the incorporation of admixtures, additions, glass fibres or steel fibres, which develops its properties by hydration of the cement [EN 206-1:2000] SIST EN 12446:2011

EN 12446:2011 (E) 6 3.3 outer wall element chimney component that surrounds a flue liner to form the outer wall of a chimney 3.4 hollow wall outer wall element outer wall element having vertical cavities NOTE Cavities can pass through both ends of the hollow wall outer wall element. 3.5 manufacturer's declared internal transverse dimensions internal dimensions of the outer wall element measured perpendicular to the longitudinal axis 3.6 manufacturer's declared height internal height of the outer wall element NOTE Examples of measurement are shown in Figure 1.

Key H Internal height Figure 1 — Internal height 3.7 manufacturer's declared structural height maximum safe constructional height of the outer wall elements as declared by the manufacturer 3.8 manufacturer's declared overall wall thickness dimensions at its thinnest point, between the inside face and the outside face of the outer wall element, not measured at any joint feature, e.g. spigot/socket end 3.9 outer wall element with handling reinforcement outer wall element having steel reinforcement to assist handling and transportation 3.10 solid wall outer wall element outer wall element without cavities in the thickness of its walls SIST EN 12446:2011

EN 12446:2011 (E) 7 3.11 straight outer wall element outer wall element having the ends perpendicular to the axis of the flue 3.12 storey-height outer wall element factory made outer wall element having an overall height relating to the floor to floor height of a building 3.13 precast concrete

concrete that is cast in a place other than its final location of use [EN 1858:2008] 4 Materials

4.1 General Outer wall elements shall be made of pre-cast concrete. Materials shall be identified for factory production control purposes. NOTE Additions can include glass or steel fibres. 4.2 Reaction to fire Attention is drawn to the Commission Decision 96/603/EC, as amended, in which non-combustible masonry units containing not more than 1 % by mass or volume (whichever is the more onerous) of homogeneously distributed organic materials are classified as reaction to fire class A1 without testing. 5 Reinforcement for handling Where an outer wall element is reinforced for handling, the reinforcement shall have a maximum diameter of 8 mm and a minimum concrete cover of 15 mm on all sides for temperature classes up to and including T 250 and 20 mm on all sides for all other temperature classes. In outer wall elements having a bulk density of less than 2 000 kg/m3, when measured according to A.10 of EN 1857:2010, any reinforcement shall be protected against corrosion by one of the following means: a) use of stainless steel conforming to the requirements of EN 10088-2; b) by completely covering any mild steel reinforcement conforming to the requirements of EN 10218-2 with a coating (e.g. Portland cement CEM I or CEM II mixed with water to form a slurry, or epoxy resin). 6 Surface treatment Any surface treatment of the outer wall element, e.g. render, coating, shall be applied as described by the product manufacturer, prior to testing. SIST EN 12446:2011

EN 12446:2011 (E) 8 7 Form, dimensions and tolerances 7.1 Form Outer wall elements covered by this standard shall be manufactured in one of the following forms: a) with a single passage to accommodate a flue liner; b) with up to four passages to accommodate a combination of up to four flue liners and/or duct/s used for ventilation/combustion air. 7.2 Dimensions Outer wall elements shall have a wall thickness not less than 20 mm. 7.3 Tolerances Tolerances on manufacturer’s declared dimensions, including taper, shall be:

a) Declared internal transverse dimensions below 300 mm: ± 3 mm 300 mm and above:

± 1,5 % b) Declared height below 300 mm ± 5 mm 300 mm to 700 mm: ± 7 mm above 700 mm: ± 10 mm c) Declared overall wall thickness below 10 mm: 21+− mm 10 mm to 40 mm : 51,5+− mm above 40 mm: 125+− % 7.4 Squareness of ends When tested in accordance with either procedure described in A.3 of EN 1857:2010, the permissible deviation from squareness of ends of concrete outer wall elements shall not be greater than 10 mm at 'G' for the first procedure. With the second procedure the deviation shall not be more than 5 mm at 'G' for elements up to 400 mm and 8 mm at 'G' for elements greater than 400 mm in height. SIST EN 12446:2011

EN 12446:2011 (E) 9 8 Performance 8.1 Heat stress resistance 8.1.1 When an outer wall element, including those designated soot fire resistant, is tested as described in A.1 at the test temperature given in Table 1 appropriate to the designation, it shall also meet the requirements of 8.4. When an outer wall element has multiple passages with an equal wall thickness, the heat stress test shall be carried out on the passage with the highest temperature designation. 8.1.2 Bends or fittings, made of the same material mix and by the same method of manufacture as the tested straight outer wall element, shall be deemed to conform to 8.1.1. 8.1.3 Outer wall elements, made of a different material mix or using a different method of manufacture from those in 8.1.2, shall be checked for heat stress resistance by testing a special straight test sample in accordance with 8.1.1. This straight test sample shall be made using the same material mix and manufacturing method as the outer wall elements. 8.1.4 If a bend or fitting is available in the range of products, the test assembly shall include a combination of the fitting equivalent to the size being tested. The outer wall element shall be installed according to the manufacturer’s instructions. 8.1.5 The maximum temperature measured on the surface of adjacent combustible materials shall not exceed 85 °C when related to an ambient temperature of 20 °C. The manufacturer shall declare the distance to the combustible partition and whether the gap between the outer wall element and the adjacent combustible partition is opened or closed. The above mentioned distance shall be determined by testing to the heat stress of A.1 at a temperature given in Table 1 appropriate to the product designation. Table 1 — Heat stress test temperature Temperature class Temperature of flue gas °C T 600 700 500+ T 450 550 500+ T 400 500 500+ T 300 350 350+ T 250 300 300+ T 200 250 250+ T 160 190 190+ T 140 170 170+ T 120 150 150+ T 100 120 120+ T 080 100 100+

SIST EN 12446:2011

EN 12446:2011 (E) 10 8.2 Heat shock resistance 8.2.1 Following the heat stress resistance test required in 8.1, when an outer wall element designated as soot fire resistant is tested as described in A.1.4 to a flue gas temperature of 1 000 °C for a period of

30 min ± 1 min, the element shall subsequently meet the requirements of 8.4. When an outer wall element has multiple passages with an equal wall thickness, the heat shock test shall be carried out on the passage with the highest temperature designation. NOTE The test described in A.1.4 is the method used to assess the sootfire resistance. 8.2.2 Bends or fittings, made of the same material mix and by the same method of manufacture as the tested straight outer wall element, shall be deemed to conform to 8.2.1. 8.2.3 Outer wall elements, made of a different material mix or using a different method of manufacture from those described in 8.2.2, shall be checked for heat shock resistance by testing a special straight test sample in accordance with 8.2.1. This straight test sample shall be made using the same material mix and manufacturing method as the outer wall elements. 8.2.4 The maximum temperature measured on the surface of adjacent combustible materials shall not exceed 100 °C when related to an ambient temperature of 20 °C, when test assembly is tested at the test temperature of 1 000 °C over a period of 30 min. The manufacturer shall declare the distance to the combustible partition and whether the gap between the outer wall element and the adjacent combustible partition is opened or closed. This distance shall not exceed the distance determined as described in 8.1.5. 8.3 Thermal resistance Thermal resistance shall be measured according to the method given in A.4 of EN 1858:2008 (reference method) or calculated according to the method given in Annex C of EN 1858:2008 and the value obtained declared. 8.4 Compressive strength 8.4.1 When tested as described in A.8 of EN 1857:2010, straight outer wall elements shall withstand an intensity of loading equivalent to 4 times the manufacturer's declared structural height before subjecting the element to the thermal performance test(s) and three times the manufacturer's declared structural height after subjecting the element to the thermal performance test(s). 8.4.2 Outer wall element bends and fittings made of the same material mix and by the same method of manufacture as the tested straight elements shall be deemed to conform to 8.4.1. 8.4.3 Outer wall elements made from a different material mix, or using a different method of manufacture from those described in 8.4.2, shall be checked for compressive strength by testing a special straight test sample in accordance with 8.4.1. This special straight test sample shall be made using the same material mix and manufacturing method as the bend or fitting. 8.5 Bulk density When outer wall elements are tested as described in A.10 of EN 1857:2010, the lowest and highest bulk density value shall be within a tolerance of ± 10 % of the manufacturers declared bulk density for the outer wall element. 8.6 Freeze-thaw resistance Where national regulations require freeze/thaw resistance of wall elements, they shall be tested in accordance with EN 14297. The product shall not present any damage of type 7, 8, 9 and 10 in accordance with EN 14297:2004, Table 1. SIST EN 12446:2011

EN 12446:2011 (E) 11 8.7 Flexural strength under wind loading The manufacturer shall declare the maximum free standing height of outer wall elements. Without testing, this shall be no greater than 4,5 times the least lateral overall external dimension of the outer wall element from the last point of lateral support, see Figure 2.

Key 1 top of chimney excluding any terminal or chimney pot 2 last point of support Figure 2 — Explanation of last point of support Alternatively, the free standing part of the outer wall element above the last lateral support shall withstand a wind load of 1,5 kN/m2 (or a value according to national regulations) when tested in accordance with A.2. 8.8 Gas tightness of passages used for combustion air The gas tightness of the passage of an outer wall element, which is to be used for the air supply duct of a room sealed chimney application, shall be at least N2 (as defined in EN 1857) when measured after thermal testing. The gas tightness test shall be carried out in accordance with A.3. 8.9 Resistance to fire external to external Where national regulations require resistance to fire external to external (see EN 1443) of outer wall elements, they shall be evaluated and declared in accordance with those regulations. 8.10 Dangerous substances Materials used in products shall not release any dangerous substances in excess of the maximum permitted levels specified in a relevant European Standard for the material, or permitted in the national regulations of the member state of destination. SIST EN 12446:2011

EN 12446:2011 (E) 12 NOTE See NOTE 2 in ZA.1. 9 Designation 9.1 Designations and classes Outer wall elements shall be designated according to their intended nominal working temperature and their resistance to sootfire, as given in 9.2 to 9.6.

NOTE An example of a designation system is given in Figure 3.
EN 12446
- T 120 (P)
- O(20)
Mi The number of this standard Flue gas temperature class
...

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