BS EN 15254-7:2012 pdf download

BS EN 15254-7:2012 pdf download.Extended application of results from fire resistance tests – Non-load bearing ceilings Part 7: Metal sandwich panel construction.
4 Establishing the field of extended application
4.1 General
An extended application analysis is required when the application differs in one or more parameters from the one tested and described in the test report and/or in the classification document, and which is not covered by the field of direct application of the classification document,
The extended application of the sandwid, panels used as a non-loa&earing ceiling shall be based on the reference lire test results performed according to EN 13642 It may be complemented by one or more additional small or full-scale tests or by histoncal data. If histoncal data are used, they shall comply with the rules given In this document
4.2 AssumptIons In the extended apptlcatlon
The following assumptions are considered when evaluating extended applications for sandwich panels:
a) the ceiling is required to possess fire resistance in the end-use condition (relevant classes are given in
EN 13501-2):
b) the ceiling is assumed to be exposed on the entire face of one side (either from above or below) to the standardised heating conditions given in the EN 1363-1 fire resistance test specification:
C) the structure to which the ceiling is fixed does not deflect during the lire exposure period; this simulates the non-deflecting nature of the test frame which forms part of the furnace test apparatus;
NOTE In reality conslructions deflect and this fact should be talen into aixount when designing the building and planning the consiructional details.
d) after delamination of the fire exposed taang, the dead load of the panels is carried by a support structure to which the ends of the sandwich panels are attached; the forces from the dead load will be distributed to the support structure by the panel fixings from which loadbearing capacity shall be evaluated:
e) the support structure has at least the same loadbearlng capacity. R, of the resistance to fire performance as the sandwich panel ceiling regarding inlegrity:
f) the self weight of the facng and core Is calculated from the volume and density of tile materials:
A non-coat Gd metal sheet can have an emlssivity as low as 0,1. A change from a coated to a non-coated sheet is therefore not allowed. The same rule specified above for coatings applies also ii this case. A decrease in emissivity of 10 % is allowed it the emissavities of the different sheets are known.
For changes in en,isslvity >10 %. surface temperatures can be estimated from small-scale tests In accordance with 8.1 where the surface temperatures of the new panel are compared to the one tested in the reference scenario, II appropriate calculation methods are available, the surface temperatures can also be calculated and compared, provided that temperature-dependent thermal resistance values for me core material are available.
The energy content of the coating on the exposed side is small and will not affect the fire resistance properties of the sandwich panel. Test results are valid for all coatings.
H modifications in the coatings on the non-exposed side are made, compared 10 the tested one, the ignitability of the modified coating shall be higher or equal to that tested. This can be checked by conducting small-scale tests according to 6.1. Test results are valid for all colours of the same type of coating.
5.2.2.2 Variations In the metal material
The following rules are valid for extended applications.
1) The test results are valid for al grades of tested normal steel, and If once tested as stainless steel for all grades of stainless steel. (A change Iron, mild steel to stainless steel is not possible without conducting further tests.)
2) For other types of metals, the test result Is valid for tested type only.
3) For panels with perforated facings on one or both sides 01 the panels, a test result achieved with a perforated facing is always valid for non-perforated facings in the same position as in the tested product. Test results for a product tested with non-perforated facings are valid only for a product with perforated facings on the fire exposed side where the perforation area is not greater than 25 % and where the reaction to fire class of the core material is A2-sl, dO or better. Other changes are not allowed
5.2.2.3 Changes in profile geometry of facing
The following rules are valid for extended applications.
1) For Mater small profiling (between 0mm and 5mm): test results are valid for any change.
2) For profiles greater than 5 mm: test results are valid for variations + 50% of profile depth.