EN 1366-1 EN 1366-1 Fire resistance test for service installations -Part 1 : Ducts General principles The objective of the test method described in EN 1366-1 is to assess the ability abili ty of a duct system to resist a re from spreading from one re compartment to another.. Not only does the test cover the re another re resistance of the ducts, but also the suspension system and the penetration through the wall/oor wall/oor..
Preparation for a horizontal test at DBI
The test is divided into two re scenario s, re from outside of the duct and re from inside of the duct. One duct is needed for each scenario and both scenarios have to be tested in horizontal and vertical direction. A total of four ducts are therefore necessary for a full test. A full test covers one type of duct shape (circular or rectangular) and one type of supporting construction (rigid or exible). As an example, a full test could cover circular ducts penetrating a rigid wall/oor wall/oor.. Each duct are tested with a part of the duct inside the furnace (exposed surface) and a part outside the furnace (unex-posed surface) as shown in the photo. The standard heating curve described in EN 1363-1 is used for both scenarios.
Fire from outside Fire from outside
The duct is subjected to an under pressure of 300 Pa. The end of the duct outoutside the furnace is unrestrained making it possible for the duct to defect. During the test, the leakage due to under pressure, the deection of the duct and the temperature rise on the unexposed surface are measured (see gure A).
Fire from inside Inside the furnace the duct is partly opened. A fan is connected to the duct in order to extract hot furnace gas at a velocity of 3 m/s. For ve minutes, prior to every 30 minutes of testing, the fan is switched off (see gure B). The duct is restrained at both ends. Forces from the elongation of the duct and the temperature rise on the unex-posed side are measured during the test.
Performance criteria Fire from inside
The ducts are monitored throughout the test for performance against three criteria: Integrity (E), Insulation (I) and Smoke leakage (S). The integrity is the ability of the duct system to prevent the passage of ames and hot gases through the system and to prevent the occurrence of ames on the unexposed side. The duct can no longer satisfy the integrity criteria if: • • •
sustained aming on the unexposed side occurs it fails the cotton pad test or the gap gauge test the leakage exceeds 15 m3/h per m2 exposed duct surface. This criterion applies only to duct A.
The duct does no longer satisfy the Insulation criteri a if the temperature rise on the unexposed side exceeds 180 oC on any of the thermocouples or 140 oC in average. (The average temperature criterion only applies for some of the thermocouples.)
The smoke leakage criterion is equal to the thi rd integrity criterion with a limi t of 10 m3/h per m2 exposed duct surface.
Testing at DBI The capacity of the combi furnace at DBI makes it possible to test both re from inside and re from outside simultaneously. It is possible to mount the vertical ducts in a frame away from the furnace, while at the same time, the horizontal ducts are built in into the combi furnace.
Further information
For further information regarding testing re dampers according to this method, please contact Anders Drustrup Phone: +45 36 34 90 38 E-mail:
[email protected]
This testing facility makes it possible to m ount the vertical and the horizontal duct at the same time if the sponsor wishes. The exible system of double mounting i ncreases the efciency and reduces the time for preparation and testing. At DBI the time needed to make a complete horizontal and a vertical test is 1½ weeks. The dimension of the ducts needed for the test is listed in the table below. Classifcation
The three performance criteria are used for classifying the duct system according to prEN 13051-3 (The prEN 13051-3 is not yet nished, but is expected to be published in 2005). Ducts tested with the prescribed dimensions cover ducts with rectangular dimensions up to 1000 mm x 1000 mm and circular ducts with a diameter up to 1000 mm.
Test sp ecim ens Cross-section Circu lar
Rectangular
Scenario Fire outside duct (A) Fire inside duct (B)
Diameter 800 ±10 mm 630 ±10 mm
Scenario Fire outside duct (A) Fire inside duct (B)
Width 1000 ±10 mm 1000 ±10 mm
Height 500 ±10 mm 250±10 mm
Danish Institute of Fire and Security Technology Jernholmen 12, DK-2650 Hvidovre Tlf.: +45 36 34 90 00, Fax: +45 36 34 90 01 E-mail:
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