BS/EN 12662-2014 pdf download.Liquid petroleum products Determination of total contamination in middle distillates, diesel fuels and fatty acid methyl esters.
8 Sampling
8.1 Unless otherwise specified, obtain samples in accordance with the requirements of EN ISO 3170. EN ISO 3171. EN 14275, oran equivalent national standard.
8.2 The preferred procedure is to take samples dynamically from a sampling loop in a distribution line or from the flushing line of an automatic pipeline sampling device in accordance with the principles specified in EN ISO 3171. Ensure that the line to sampler is flushed with fuel before taking the sample.
8.3 If samples are taken manually the samples shall be taken directly into the sample container (6.15).
8.4 Where it is only possible to obtain samples from static storage follow the procedures given in EN ISO 3170, ensuring that the final sample has not passed through intermediate containers prior to placement In the prepared container.
8.5 Glass containers shall be used to take and store the samples. These containers should be cleaned according to Clause 7. Glass is used in order to facilitate the visual surveillance of the sample homogenisation before subsequent analysis. Ensure that the samples receive the minimum exposure to light. Use either brown glass containers or shield the samples from light during transportation and storage. To facilitate sampling from refuelling nozzles, wide necked bottles should be used.
8.6 Fill the sample container to between 80 % and 85 % of its capacity.
8.7 The collected sample shall be homogenised according to the procedure given in 9.2.4 before any other
analytical measurements are carried out, to avoid non-representative sampling when this method is performed.
9 Preparation of the test portion
9.1 General
Make sure that the sample container (6.15) is free of adhering particles which can distort the analysis. In case of doubt, rinse the outside of the container and its closure with water and propan-2-ol (5.3), as described in 7.2 to 7.5, to remove any adhering particles and avold introducing undesirable contamination in the test sample.
9.2 Middle distillates and diesel fuels
9.2.1 Loosen me sample container closure and place the container and its content in a water bath or oven (6.11) at 40 C for 30 mm to 60 mm to ensure that any components that have separated out have dissolved again.
9.2.2 Remove the sample container from the water bath or oven and tighten the container closure. Let it cool down to room temperature. Wash the outside of the container with propan-2-ol.
9.3.2 Remove the sample container from the water bath or oven and tighten the container closure. Let it cool down to room temperature. Wash the outside of the container with propan-2-ol.
9.3.3 Place the I I bottle (6.5) onto the balance (6.13) and tare.
9.3.4 Shake the sample container for at least 10 s, one-to-two strokes per second, using 10 cm to 25 cm strokes.
Invert the container and continue to shake for at least a further 10 s. then re-invert and shake for at least a further
10 s. If there are any visible signs of contaminant adhering to the container walls, repeat shaking procedure.
The use of a mixer is not allowed.
9.3.5 Weigh Into the bottle a test portion equivalent to approximately 300 ml. The sample shall be poured very quickly into the bottle, without trying to get a volume as dose as possible to 300 ml. Record the mass of the test portion mE to the nearest 0,1 g.
9.3.6 Add 300 ml of the solvent (5.4) by means of a 500 ml graduated cylinder (6.4). Mix thoroughly and leave at ambient temperature for 2 h before filtration.
9.4 Liquid petroleum products with a kinematic viscosity exceeding 8 mm2ls at 20 °C, or
5 mm2ls at 40 °C
9.4.1 Loosen the sample container closure and place the container and its content in a water bath or oven (6.11) at 40 C for 30 mm to 60 mm to ensure that any components that have separated out have dissolved again.
9,4.2 Remove the sample container from the water bath or oven and tighten the container dosure. Let it cool down to room temperature. Wash the outside of the container with popan-2-ol.
9.4.3 Place the 11 bottle (6.5) onto the balance (6.13) and tare.
9.4.4 Shake the sample container for at least 10 s, one-to-two strokes per second, using 10 cm to 25 cm strokes.
Invert the container and continue to shake for at least a further 10 s, then re-invert and shake for at least a further
10 s. If there are any visible signs of contaminant adhering to the container walls, repeat shaking procedure.
The use of a mixer is not allowed.
9.4.5 Weigh into the bottle a test portion equivalent to approximately 300 ml. The sample shall be poured very quickly into the bottle, without trying to get a volume as close as possible to 300 ml. Record the mass of the test portion mE to the nearest 0.1 g.
9.4.6 Dilute the weighed sample portion (mE) with heptane (5.1) to a kinematic viscosity not exceeding 8 mm2/s at 20 C, or 5 mm2ls at 40 ‘C. Mix thoroughly.BS/EN 12662-2014 pdf download.
BS/EN 12662-2014 pdf download
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