This part, together with bs 476 20, 21, 23 and 24, supersedes bs 476 8. Research has clearly shown that the different types of plastics behave in different ways under fire. For the purposes of this part of bs476, the definitions given in bs 476 20 and bs4422 apply. British standard a single copy of this british standard is licensed. This part should be read in conjunction with bs 476 20 which describes the. The sample exposed to high temperature and pressure conditions, the test samples within the specified time bearing weight, integrity and insulation. Complete document fire tests on building materials and structures part 20. Bs 476 20 fire tests on building materials and structures part 20. Method for determination of the fire resistance of elements of construction general principles. Bs 476 22 has been prepared under the direction of the fire standards committee, and describes the procedures for determining the fire resistance of nonloadbearing elements of building construction. Methods for determination of the contribution of components to the fire resistance of a structure licensed copy.
Using a single mineral insulated thermocouple, positioned at mid diameter of the inside of the ducts, at a position approximately 100 mm from the unexposed surface of the wall, coincident with the end of the steel tube. For bench tests, the variations in the burning rate of products are. Part 22 1987 there are the following differences and similarities in both test methods. The dfr2 joint products are ul listed file no r26111, for use in joint system nos. Classification and method of test for external fire exposure to roofs. The basic standard used to investigate these types of joint systems is. The specimen should be tested at full thickness provided that it can be fitted into the specimen holder, if not, the unexposed face should be cut away to reduce the thickness to a minimum of 50 mm. Flameshield fireduct, fire rated ductwork, bs 476 part 24. Fire resistance test utilising the general principles of bs 476. Product standards flameshield fireduct is fully compliant with bs 476 part 24 flameshield products have been fully tested in accordance with bs 476 part 24. The legal validity of this report can only be claimed on presentation of the complete report.
Bs 476 20 fire resistance of load bearing elementsbritish standard preface the objective of determining fire resistance, as described in the part and the associated parts of bs 476, is to assess the behaviour of a specimen of an element of building construction when subjected to defined heating and pressure conditions. The purpose of bs 476 part 24 1987 and iso6944 1985 is to measure and ensure the ability of a ductwork system to resist the spread of fire whilst maintaining its stability and integrity as a ductwork system. Bs 47620 fire tests on building materials and structures. The test was carried out in accordance with bs 476. British standard a single copy of this british standard is licensed to giorgio cavalieri on november 16, 2000 this is an uncontrolled copy. This standard has been superseded by the current bs en 661, bs en 668 and bs en 669, but it has been retained based on a legitimate need for the standards within noneu markets. For the purposes of this part of bs 476, the definitions given in bs 476 20 and bs 4422 apply, together with the following. The thermocouples which are required to measure the furnace gas temperatureare s different wire thermocouples in the bs vs.
Flameshield fireduct fire rated ductwork bs 476 part 24. The test was performed in accordance with the procedure specified in bs 476. The way of constructing andmounting the test specimen is the same. All bsi british standards available online in electronic and print formats. A representative sample of the elements is exposed to a vs regime of heating and the performance of the test sample is monitored on the basis of criteria described in the standard. The general changes bss to the methods described in this part compared with 477621 are described in the foreword to bs methods for determining the fire resistance of loadbearing elements that have 477621 finite fire resistance and of components that make a contribution to the fire resistance of a structure are described in bs and 23 respectively. Bs 476 22 fire tests on building materials and structures part 22.
The specimens were adhered to a 12mm calcium silicate board using. Bs 476 21 pdf bs fire tests on building materials and structures part methods for determination of the fire resistance of loadbearing elements of construction. Details of the test specimen the overall size of the leaf was 1250mm high x 1230mm wide x 54mm thick. Method for determination of the fire resistance of elements of construction general principles bs 476 21. However, the latter will still be made available on request since it is referred to in building regulations and other legislative documents. In the standard fire tests, three criteria are to be examined, including loadbearing capacity, integrity and insulation.
You may experience issues viewing this site in internet explorer 9, 10 or method of test for determination of the fire resistance of. The fileopen plugin works with adobe reader and other viewers. Fire tests on building materials and structures part 20. Method for measuring the rate of heat release of products. In order to read a secure pdf, you will need to install the fileopen plugin on your computer.
This part should be read in conjunction with bs 476 20 which describes the general principles for these methods. The purpose of bs476 part 24 1987 and iso6944 1985 is to. Furnace the furnace was controlled so that its mean temperature complied with the requirements of bs 476. Flameshield fireduct achieves this without the requirement of any external or internal coatings. Fire resistance test utilising the general principles of bs 476 bostik. However, the regulations require that large cavity barriers should be tested to bs 476 as either vertical or horizontal separating elements, whichever is appropriate to their use. This part should be read in conjunction with bs 47620 which. Method for determination of the fire resistance of nonloadbearing elements of construction. Fire resistance testing bs 476 the building test centre. The sample exposed to high temperature and pressure conditions, the test samples within the specified time bearing weight, integrity and.