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BSI 23/30444338 DC 2023

BSI 23/30444338 DC 2023

$13.70

BS EN 1366-8. Fire resistance tests for service installations – Part 8. Smoke extraction ducts

Published By Publication Date Number of Pages
BSI 2023 52
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This document specifies a test method for determining the fire resistance of smoke extraction ducts. It is applicable only to smoke extraction ducts that pass through another fire compartment from the fire compartment to be extracted in case of fire. It represents fire exposure of a fully developed fire. This method of test is only applicable to fire resistant ventilation ducts (same construction) with the following classification according to EN 13501-3: – fire from inside and outside i ↔ o; – applicable to a pressure difference up to 500 Pa; NOTE 1 It is assumed that the duct A test(s) in accordance with EN 1366-1 has been performed with an under-pressure of minimum 500 Pa. – with integrity (E) and insulation (I) criteria equal to or higher than the intended classification for the smoke extraction duct. For the purposes of the test described in this document, the duct is referred to as duct C. This test method has been designed to cover both vertical and horizontal smoke extraction ducts. A vertical system need not be evaluated to this method provided that: – both horizontal (ho) and vertical (ve) classification according to EN 13501-3 has been obtained for the ventilation duct, and – it has been tested in a horizontal orientation to this method. If the ventilation duct in practice is only used for vertical applications in smoke extraction systems, only vertical (ve) classification is bound to be used and tested in a vertical orientation to this method according to EN 13501-3. This test method is suitable for ducts constructed from non-combustible materials (Euroclass A1 and A2 according to EN 13501-1). NOTE 2 Reaction with components of the duct can reduce the oxygen concentration and lead to misinterpretation of the calculated leakage rate. This standard applies to four sided ducts only (with fire exposure on all four sides). Ducts that utilize elements of construction for one, two or three sides are not covered. An alternative test method for one, two and three sided ducts will be developed separately.

PDF Catalog

PDF Pages PDF Title
7 1 Scope
2 Normative references
8 3 Terms and definitions
9 4 Test equipment
4.1 General
4.2 Furnace
4.3 Perforated plate
10 4.4 Inlet nozzles
4.5 Ambient temperature leakage measuring device
4.6 Pressure sensors for differential pressure control
4.7 Welded connecting duct
4.8 Extraction fan
11 4.9 Thermocouples
4.10 Surface thermocouples
4.11 Oxygen measuring equipment
4.12 Oxygen measurement probes
4.13 Restraining equipment
4.14 Deflection measurements
5 Test conditions
12 6 Test specimen
6.1 Size
6.1.1 General
6.1.2 Length
6.1.3 Cross-section
6.2 Number
6.3 Design
6.3.1 General
6.3.2 Openings in duct
13 6.3.3 Joints in horizontal ducts
6.3.4 Joints in vertical ducts
6.3.5 Support for vertical ducts
6.3.6 Compensators
6.3.7 Access panels
14 7 Installation of test specimen
7.1 General
7.2 Standard supporting construction
7.3 Restraint of ducts
7.3.1 Inside the furnace
7.3.2 Outside the furnace
15 8 Conditioning
8.1 General
8.2 Water-based sealing materials
9 Application of instrumentation
9.1 Thermocouples
9.1.1 Furnace thermocouples (plate thermometers)
9.1.2 Unexposed surface thermocouples
9.1.3 Measurement of gas temperature adjacent to nozzles
9.2 Pressure
9.2.1 Furnace pressure
9.2.2 Under-pressure in duct
16 9.3 Oxygen measurements
9.4 Deflection measurement for determination of reduction in internal cross-section area
17 10 Test procedure
10.1 General
10.2 Pre-test adjustment of the perforated plate
18 10.3 Test at ambient temperature
10.4 Pre-fire test procedures
19 10.5 Fire test
20 11 Performance criteria
11.1 General requirements
21 11.2 Criteria at ambient temperature
11.2.1 Ambient leakage
11.2.2 Reduction in internal cross-section area under ambient conditions outside the furnace
11.3 Criteria under fire conditions
11.3.1 General
11.3.2 Integrity
11.3.2.1 General
11.3.2.2 Leakage (Integrity)
11.3.2.3 Mechanical stability
22 11.3.2.4 Reduction in internal cross-section area under fire conditions
11.3.3 Insulation
11.3.4 Smoke-Leakage
12 Test report
23 13 Field of direct application of test results
13.1 General
13.2 Vertical and horizontal ducts
13.3 Sizes of ducts
13.4 Supporting construction
13.5 Steel ducts
40 Annex A (normative)Measurement of volume/mass flow
A.1 Hints on measuring volume flow or mass flow with differential pressure devices
A.2 Density
41 A.3 Absolute pressure (barometric pressure)
A.4 Viscosity
42 A.5 Characteristic data of the inlet nozzles according to Figure 7 of this standard
45 Annex B (informative)Measurement of oxygen concentrationDetails on measuring oxygen concentration with paramagnetic cell analysers
B.1 General
B.2 Choice of O2 measuring devices
46 B.3 Effect of O2 measuring device errors
B.4 Zero and end point drift
48 Annex C (informative)The usage of correction factors for the consideration of different parameters
C.1 Details for the development of the correction factors and their error limits
C.2 The complete formula for the leakage mass flow and the parameters
51 C.3 Application of correction factors in the simple mass flow formulae and achievable accuracy

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BSI 23/30444338 DC 2023
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