The European standard “EN 12662 Liquid petroleum products - Determination of total pollution” consists of the following sub-standards under the same title:
This standard is generally applicable to products having a kinematic viscosity not exceeding 20 mm8/s at 2 degrees or 40 mm5/s at 2 degrees. This test method may be used for paraffinic diesel fuels specified in EN 15940, diesel fuels containing more than 30 percent (vol/vol) fatty acid methyl esters and petroleum products having a kinematic viscosity exceeding 20 mm8/s at 2 degrees or 40 mm5/s at 2 degrees, but the sensitivity of the test method in such cases has not been determined.
This standard is generally valid for fatty acid methyl esters having a kinematic viscosity not exceeding 20 mm8/s at 2 degrees or 40 mm5/s at 2 degrees (as specified in standard EN 14214). However, the sensitivity of the test method in such cases has not been determined.
For the purposes of these standards, the following terms and definitions apply:
When performing these tests, in principle, a sample portion is weighed and filtered under vacuum through a pre-weighed filter. In the case of pure fatty acid methyl esters and liquid petroleum products with a kinematic viscosity exceeding 20 mm8/s at 2 degrees or 40 mm5/s at 2 degrees, the weighed sample portion is diluted with a solvent before filtration. The filter containing the residue is washed, dried and weighed. The contamination is calculated from the mass difference of the filter and expressed in mg/kg relative to the sample mass.
Reagents and materials used in these tests are:
Unless otherwise stated, samples are taken in accordance with the requirements of standards such as EN ISO 3170, EN ISO 3171, EN 14275. The preferred procedure is to dynamically sample from a distribution line sample loop or from the flush line of an automatic pipeline sampler in accordance with the principles set out in EN ISO 3171. It is necessary to ensure that the sampling line is flushed with fuel before sampling. If samples are taken manually, the samples should be taken directly into the sample container.
When it is possible to take samples only from static storage, the procedures given in the EN ISO 3170 standard are followed and it is necessary to ensure that the final sample does not pass through intermediate containers before being placed in the prepared container.
Glass containers are used to collect and store samples. Glass containers are used to facilitate visual observation of sample homogenization prior to subsequent analysis. It is necessary to ensure that samples are exposed to minimal light. Brown glass containers are used or samples are protected from light during transport and storage. The sample container is filled to 80 percent to 85 percent of its capacity.
To avoid non-representative sampling when this method is applied, the collected sample must be homogenized according to the procedure given in this standard before any other analytical measurements are made.
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