BS EN 12446-2011 pdf download.Chimneys – Components Concrete outer wall elements.
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 I 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 Al at a temperature given in Table 1 appropriate to the product designation.
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 mm ± 1 mm, 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 sootflre 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 mm. 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 manufacturers declared structural height before subjecting the element to the thermal performance test(s) and three times the manufacturers 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.BS EN 12446-2011 pdf download.