BS EN 15414-3-2011 pdf download.Solid recovered fuels Determination of moisture content using the oven dry method Part 3: Moisture in general analysis sample.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 15357:2011 Solid recovered fuels — Terminology, definitions and descriptions
EN 15443, Solid recovered fuels — Methods for the preparation of the laboratory sample
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 15357:2011 apply.
4 Principle
The analysis sample of recovered fuel is dried at a temperature of 105 °C under air atmosphere. nitrogen atmosphere or vacuum conditions. The percentage of moisture is calculated from the loss in mass of the test sample. If the sample material is susceptible to oxidation (at 105 °C). drying in nitrogen atmosphere or vacuum conditions is performed.
5 Apparatus
5.1 DryIng oven, capable of being controlled at (105 ± 2) °C (see declaration of the manufacturer) and in which the air atmosphere changes between three and five times per hour. The air velocity shall be such that the sample particles are not dislodged from their weighing dish (52).
NOTE For the use of vacuum dryrng oven, see EN 14774-3.
5.2 Weighing dish, of glass or corrosion resistant and temperature resistant material, with a well-fitting lid and of such a size that the sample layer does not exceed 0,2 glcm2.
5.3 Balance, with a sufficient accuracy to weigh the sample to the nearest 0,1 mg.
5.4 Dessicator, to avoid absorption of moisture from the atmosphere to the sample.
The sample used for the determination shall be the general analysis test sample with a particle size ≤ 1 mm prepared in accordance with EN 15443.
Before commencing the determination, mix the analysis sample preferably by mechanical means.
7 Procedure
A minimum of two determinations shall be carried out on the test sample.
Dry an empty weighing dish (5.2) with its lid at (105 ± 2) C until constant mass is reached and allow it to cool to room temperature in the dessicator (5.4).
NOTE I Several weighing dishes can be handled at the same time.
Weigh the weighing dish (5.2) with its lid to the nearest 0,1 mg.
Add minimum 1 g of the analysis sample into the weighing dish (5.2) in an even layer and weigh the weighing dish with its lid plus sample to the nearest 0.1 mg.
Heat the uncovered weighing dish (5.2) and its lid together with the sample at (105 ± 2) °C until constant mass is reached. Constancy in mass is defined as a change not exceeding 1 mg in mass during a further period of heating at (105 ± 2) °C over a period of 60 mm. If the sample material is susceptible to oxidation at the given temperature. dry in nitrogen atmosphere or under vacuum conditions (see EN 14774-3 for vacuum conditions). Report the drying atmosphere.
NOTE 2 The drying time required Is usually between 2 h to 3 h.
WARNING — For some materials present In solid recovered fuels there can be a risk of self-ignition when drying at 105 °C.
Replace the lid while the weighing dish (5.2) is still in the drying oven (5.1). Transfer the weighing dish and its contents to the dessicator (5.4). Allow it to cool to room temperature.
Weigh the weighing dish (5.2) and its lid with the sample to the nearest 0,1 mg. Since small particle size recovered fuels are very hygroscopic, weigh rapidly once the sample is cooled.
NOTE 3 SInce recovered fuels In small particle size are very hygroscopic. their moisture content will vary with change ol humidity of the atmosphere and therefore, the moisture of the analyses sample should always be determined simultaneously when portions are weighed out for other analytical determinations, for example, calorific value, carbon. nitrogen.
Automatic equipments may be used if the method is validated by parallel measurements. These automatic equipments shall fulfil all the requirements regarding sample size, heating procedure, temperature. atmosphere and weighing accuracy. Deviations from this paragraph shall be reported and justified.BS EN 15414-3-2011 pdf download.
BS EN 15414-3-2011 pdf download
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