BS EN 14274-2013 pdf download.Automotive fuels Assessment of petrol anddiesel quality – Fuel quality monitoring system ( FQMS ).
For each model, the number of samples per grade per region or macro region (model A) is obtained by setting the number of samples (diesel fuel and petrol separately) to be proportional to the volume sales within each region. macro region, or sub-region (see 5.2).
5.5.2 Model A — macro regions
The regions within a country are grouped (preserving some geographical identity) into macro regions so that they have similar total sales volumes relative to each other and also about the same number of different supply sources (measured by the variability factor, see 3.9). This approach is recommended for all countries as it is designed to capture fuel variation efficiently and hence requires a smaller total number of samples, as reflected In Table 1.
If geographical, administrative or other circumstances do not allow fulfilment of the requirements for the design of this preferred model, model B shall be considered the next best model.
In defining the macro regions, a country shall first list all the principal supply points of petrol and diesel fuel (i.e. refineries, in-land terminals and coastal terminals) within each proposed macro region.
The variability factor for a macro region takes account of the number of different fuel types, which are distributed within the region, as well as the number of refineries (R) and supply terminals (T) in that region.
EXAMPLE If. In a certain region of this country, there is only one refinery (R) which supplies two terminals (Ti and T2), and if those three are the only supply points in that region, then the variability factor is 1, because the 1ue1 type served in that region comes only froni one production site If, on the other hand, one of the two terminals (T2) is supplied by another refinery (located outside the region), then the vaflability factor is 2.
Therefore, the variability factor Is not simply the sum of all refineries and terminals present in a certain region, but the number of different supply points that are supplying fuel from different sources.
Once these variability factors have been defined for each geographical or political region in the country, the regions shall be grouped into macro regions with approximately the same total variability factor and same total volumes in each macro region, thereby ensuring that the sampling proportional to fuel volumes also captures fuel variabiMty.
An explicit example is given in Annex C. If appropriate, the macro regions may be further split into sub regions by sales channel and the sampling carried out in proportion to the volumes in these sub regions. The minimum overall number of samples per grade and per season is 50 per small-size country and 100 per large-size country.
5.5.3 Model B — Non-macro region
If the construction of macro regions (based on fuel supply patterns) is not possible within a country, then the country shall be divided into regions using only geographic and administrative criteria. To ensure that fuel vanabity is reliably captured, a larger minimum number of samples per grade are required: 100 for small-size countries and 200 for large-size countries. An example is given in Annex C.
5.5.4 Model C — Non region model
If the country is small-sized (see 32.1) and when it can be demonstrated that a division into macro regions (5.5.1) or non-macro-regions (5.5.2) is not possible, having considered the procedures and provisions given in this European Standard, then the country shall be considered as one region for sampling purposes.
5.6 Number of fuel dispensing sites to be sampled
Based on the total volume of fuel dispensed (4.2) or the population size (4.4) and the model chosen (5.5), the minimum number of samples to be taken during the summer and the winter periods shall be calculated for each region, macro region and/or sub region. If. for any region or sub region, and for any one fuel grade, the minimum
number of samples is calculated to be less than one, at least one sample of that fuel grade shall be drawn from within that region or sub region.
In order to make the FQMS as robust and representative as possible, all available information shall be used to calculate the minimum number of samples to be used. The general procedure to be followed is given in Annex 0 in form of a flow chart. Extension of this system is possible, provided that no other provisions in this European Standard are violated.
5.7 Identification of fuel dispensing sites
Each site that is to be monitored shall be given a unique and unmistakable identification number. This number shall
appear on all samples drawn from the site and in the analytical reports.
5.8 AppoIntment of organisatlons
A qualified organisation. organisations or laboratories shall be appointed to draw samples. Laboratories shall be appointed to carry out the tests: see 4.6. An organisation shall be appointed to collect and compile the summary report see 6.6, containing all necessary information and data to allow the construction of a final report. see Clause 7.BS EN 14274-2013 pdf download.