untitled BRITISH STANDARD BS EN 15238 2006 Incorporating corrigendum April 2009 Soil improvers and growing media — Determination of quantity for materials with particle size greater than 60 mm ICS 65[.]
BRITISH STANDARD BS EN 15238:2006 Incorporating corrigendum April 2009 Soil improvers and growing media — Determination of quantity for materials with particle size greater than 60 mm ICS 65.080 12&23100 to 000 200 100 >1 000 to 000 000 000 >5 000 20 000 10 000 6.5 Straight edge, rigid, of rectangular cross section, of thickness not exceeding mm, preferably with a sharp edge, and at least 700 mm long 6.6 Shovel or scoop, that preserves the characteristics of the product, with dimensions sufficient to take a representative portion NOTE Use of hands is unlikely to ensure a representative sample is transferred to the measure NOTE A snow or grain shovel may be suitable for large, coarse material Calibration of the measure To calibrate the measure, place the measure and sufficient water together in a room so that the temperature of both stabilizes Determine the temperature, t Weigh it empty together with a strike, note its mass in kilograms, me (A strike is a transparent sheet of flat material, normally glass, which is large enough to easily cover the top of the measure.) Weighings shall be made in kilograms on a weighing instrument with no greater than 10 g divisions, which complies with EN 45501 Fill to the brim with water using the strike When the water level is near the top of the measure, start to slide the strike onto the rim of the measure and pick up the meniscus of the water on its underside Filling continues gradually, continuing to slide the strike over the surface of the measure so that no air bubbles are trapped under it The measure is completely filled when the strike covers the top of the measure without any air being trapped under it Weigh the filled measure and strike in kilograms, mass, mf Calculate the mass of water, mw = mf – me Calculate the volume of water by multiplying by the factor given in the table below This gives the volume of the measure, Vt, in litres, at the temperature, t, at which it has been calibrated Weigh the filled measure and strike, mass, mf Calculate the mass of water, mw = mf – me BS EN 15238:2006 EN 15238:2006 (E) Table — Multiplication factor at various temperatures for the calculation of the volume of the measure Temperature °C 10 11 12 13 14 15 16 17 18 19 Factor (L/kg) 1.00135 1.00145 1.00155 1.00167 1.00181 1.00196 1.00211 1.00229 1.00247 1.00266 Temperature °C 20 21 22 23 24 25 26 27 28 29 Factor (L/kg) 1.00286 1.00307 1.00329 1.00352 1.00376 1.00402 1.00429 1.00456 1.00484 1.00514 Calculate the volume of the measure at 20 °C using the formula, V1 = V t [E (20 − t )] (1) where E is the co-efficient of cubical expansion for the material from which the measure is made For steel this is 0.000 011/°C The volume should be rounded to the nearest 10 ml NOTE In some countries it may be a legal requirement to have the measure calibrated by an accredited calibration laboratory Sampling Sampling shall be carried out in accordance with the method specified in EN 12579, with the following exceptions: for bulk material the final sample, of at least 75 l, shall be used for a density determination; for packaged material the content of a package shall be used, and if this is less than 75 l the content of the number of packages needed to give 75 l of material shall be used Method for density determination 9.1 Using the weighing instrument (6.4), determine the gross weight of the material and its container and note the mass in kilograms, m1 Determine the tare weight of the container (e.g package, bags, truck, train) and note the mass in kilograms m2 For packaged material, where the quantity of material in each package is being measured, weigh each package separately for both gross and tare weight The net weight of the material is calculated as (m1 determined directly − m2) Alternatively the net weight of the material can be 9.2 Weigh the empty measure (6.1), note the mass in kilograms m3, and assemble the collar (6.2) on the cylinder Place the equipment on a stable horizontal surface and place the fall controller (6.3) so that the mesh is no more than 50 mm above the collar BS EN 15238:2006 EN 15238:2006 (E) Any material in the final sample that has been compressed or dried shall be loosened or moistened for usage according to the manufacturer's instructions 9.3 Tip a portion of not more than 10 l of the final sample over the fall controller, ensuring that there is sufficient room to move the material (without degrading it) to allow it to pass through the fall controller Any material retained by the fall controller shall then be gently emptied into the assembled equipment before adding the next portion Further portions shall be treated in the same manner until the measure and collar are full 9.4 Remove the collar and level off the material at the top of the measure using the straight edge (6.5) vertically Work the straight edge through the middle of the product down one diameter of the measuring cylinder, towards the top of the measure Move the straight-edge, with a light sawing action, towards the edge of the measure Care should be taken not to drag fibrous or lumpy material from below the top of the measure, nor to compact the material Remove the excess material until the material is level with the top of the measure In the case where hollows have been created, these shall be re-filled using some of the discarded material 9.5 Weigh the measure and its contents and note its mass in kilograms, m4 9.6 Repeat the method with the other final samples taken for the quantity determination See 6.4.4 and Annex A of EN 12579:1999 10 Calculation and expression of results 10.1 Density Calculate the density of the material (D), in kilograms per litre using the following equation, rounding the figure to four significant figures: D= (m4 − m3 ) V1 (2) Where: m3 is the mass in kilograms of the measure (6.1), as specified in 9.2: m4 is the mass in kilograms of the measure (6.1) filled with the material as specified in 9.5: V1 is the actual (calibrated (Clause 7)) volume in litres of the measure (6.1) 10.2 Volume Calculate the volume of the material (V2) in litres, using the following equation, rounding to three significant figures: V2 = m1 − m2 D (3) where: m1 (gross weight) is the mass in kilograms of the sampled portion including its container (e.g package, lorry) (9.1) m2 (tare weight) is the mass in kilograms of the container (9.1) D 10 is the density of the material calculated in accordance with 10.1 BS EN 15238:2006 EN 15238:2006 (E) NOTE 1000 l = m 11 Precision The repeatability and reproducibility of the density determination in separately prepared samples should be in accordance with Table A.1 A summary of the results of interlaboratory trials to determine the precision of the density determination method in accordance with ISO 5725 [2] is given in Annex A NOTE The values derived from the interlaboratory trial are necessarily applicable to materials other than those given 12 Test report for declarations of volume The test report shall include the following: a) a complete identification of the sample; b) a reference to this European Standard; c) the results expressed in accordance with Clause 10; d) any unusual features noticed during the determination; e) the calibration (Clause 7) results of the volume of the measure (6.1); f) the calibration results of the weighing instrument using masses of class M1 or above accuracy level as given in EN 45501; g) the identity of the person carrying out the determination; h) the date, time and postal address of the place of sampling; i) the date, time and postal address of the place of measurement; j) any operation not included in this method, or that is regarded as optional 13 Weight Where the quantity of the material is expressed in terms of weight then: - the net weight shall be determined (9.1) using class III weighing instruments as specified in 6.4, mass mm in kilograms, - the moisture content at the time of weighing shall be determined in accordance with EN 13040, moisture content w in percentage The dry matter content (md) is calculated from: md = mm w 1 + kg 100 (4) 11 BS EN 15238:2006 EN 15238:2006 (E) 14 Test report for declarations of weight The test report shall include the following: a) a complete identification of the sample; b) a reference to this European Standard; c) the results expressed in accordance with Clause 13; d) any unusual features noticed during the determination; e) the calibration results of the weighing instrument using masses of class M1 or above accuracy level as given in EN 45501; f) the identity of the person carrying out the determination; g) the date, time and postal address of the place of sampling; h) the date, time and postal address of the place of measurement; i) 12 any operation not included in this method, or that is regarded as optional BS EN 15238:2006 EN 15238:2006 (E) Annex A (informative) Results of an interlaboratory trial to determine density Interlaboratory trials were organized in 2004 under the auspices of the European Committee for Standardization, to obtain precision data, using ISO 5725-2:1994 [2], for the test method specified in this standard In these trials the number of organizations given in Table A.1 determined the density of the specified samples of material Product Table A.1 - Precision Data obtained from Inter-laboratory Trials Screen large yard waste Amenity bark mulch 5–75 mm Graded pine bark flakes 15–125 mm Number of laboratories retained after eliminating outliers 6 Number of outliers (laboratories) 0 Mean value [kg/l] 0,440 0,309 0,223 Repeatability, standard deviation, sr [kg/l] 0,013 0,009 0,006 Repeatability, relative standard deviation [%] 3,0 3,1 2,7 0,037 0,027 0,017 0,019 0,009 0,009 4,4 3,1 4,0 0,053 0,027 0,025 Repeatability limit, r = 2,8 sr [kg/l] Reproducibility, standard deviation, sR [kg/l] Reproducibility, deviation [%] relative standard Reproducibility limit, R = 2,8 sR [kg/l] The difference between two test results found on identical test material by one operator using the same apparatus within the shortest feasible time interval will exceed the repeatability limit (r ) on average not more than once in 20 cases in the normal and correct operation of the method Two test results on identical test material reported by two laboratories differ by more than the reproducibility limit (R) on average not more than once in 20 cases in the normal and correct operation of the method 13 BS EN 15238:2006 EN 15238:2006 (E) Bibliography [1] EN 12580 Soil improvers and growing media – Determination of a quantity [2] ISO 5725 Accuracy (trueness and precision) of measurement methods and results 14 blank BS EN 15238:2006 BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of 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