- Author
- Persson, H.
- Title
- Commodity Classification: A More Objective and Applicable Methodology.
- Coporate
- Swedish National Testing and Research Inst., Boras, Sweden
- Report
- SP Report 1993:70, 1993, 57 p.
- Keywords
- classifications | methodology | sprinklers | heat release rate | cellular plastics
- Identifiers
- commodity classification; sprinkler protection; required delivered density (RDD); rate of heat release (RHR)
- Abstract
- A correct commodity classification is one of the most important factors in order to design an efficient and reliable sprinkler system. In this project, commodity classification tests have been conducted using a test method developed by Factory Mutual Research Corporation (FMRC). 18 tests with 8 different types of commodities have been tested and the indicated classification achieved has been compared to existing classification. The classification and required level of protection stated in the Swedish sprinkler standards has also been compared to corresponding FMRC and NFPA standards. The classification tests are conducted below the Industry Calorimeter, where 8 pallet loads of the commodity to be tested are placed in a double-row rack storage segment, i.e., in a configuration of 2x2x2 pallets. The array is ignited and the fire is allowed to develop until the heat release rate measurements indicate that a sprinkler system would have operated in a real installation. Water is then applied on top of the array using a specially designed water applicator. Normally, three tests are conducted using three different delivered water densities. The classification is then based on the total and convective heat release rates measured during the three tests. The general conclusion from the tests, is that the FMRC classification test method will have a very great potential to form the basis for an international accepted procedure for commodity classification. The method is able to provide a better and more reliable classification which of course also will lead to a more reliable sprinkler protection. The tests have also shown the importance of using identical test equipment and test procedure and to use test commodities as close to the specifications as possible. This has been the reason to some problems during the project which made a final classification of the tested commodities impossible. However, this information and experience will be very valuable in the work to specify the test procedure in more detail which will be required for such a test method. The comparison of the classification systems used in Sweden and US, respectively, shows in general that the Swedish storage category L1 corresponds to US classification I-III, L2 to Class IV, L3 to Unexpanded Plastic A and L4 to Expanded Plastic A. The comparison of required level of protection shows that the Swedish sprinkler standard requires higher protection on low hazards while the required protection is lower for the plastics.