BS EN 13041:2011 pdf download
BS EN 13041:2011 pdf download.Soil improvers and growing media- Determination of physical properties-Dry bulk density, air volume, water volume, shrinkage value and total pore space.
Construct a flushable drain system from semi-rigid tubing, e.g. as shown In Figure A.2 to fit the floor of the container, allowing a 2 cm margin from the walls. Cement all joints with waterproof adhesive. Cut slIts 1 cm long in the underside of the tubing at 1 cm to 2cm spacing. Wrap the tubes in 3 layers of nylon vode. Fit PVC tubing through the bung to the drain system and cement the bung into the sink outlet. Ensure that the drain system slopes upwards to a point above the outlet. Assemble giassware and external tubing as in Figures A.3 and A.4. Close the tap. Fksh the drain system to remove the air. Fill all tubes with deaeated water and half fill the container. Connect a 5 I aspirator bottle and vacuum pi.wnp at point B. Pour sufficient clean coarse sand into the sink to cover the drain system to about 1 cm. ensuring that the slope towards the outlet Is retained within the sand. Add about 3 cm of saturated fine sand. Open the tap A, ti,wn on the vacuum to draw off water. but continue to maintain the water level well above the sand surface. When no air bubbles are visible in the lube below the sink outlet, dose tap A and add a second Layer of saturated fine sand, Repeatedly add fine sand and draw off included air until the sand surface is about 7 cm from the top of the sink. ensuring that at all times the surface is submerged under water. Dc-airing should continue at intervals for a few days after filling is completed, untd there is no evidence of air in the system. Finally, remove the vacuum system from B, set the desired pressure by adjusting the height of the outflow of the levelling bottle, open the tap A and drain off surplus water. The desired pressure is —(h) cm of water. Place a sheet of nylon voile on the sand surface while it is still wet.
To test that the sand has an air.entry value in excess of the desired pressure, leave the levelling bottle at this height for 2 d; raise the level at 10 mm intervals by 20 cm until the surface is flooded, reconnect the vacuum source and check that no air appears at the outlet tube. During the later stages of filling the container, fine material may accumulate on the surface or in suspension, allow this to settle overnight and scrape off before recommencing filling.
Should air entry occur at any time. reflood the sand table with dc-aired water and allow to drain to the pre-set suction. In case the sand table becomes airlocked. apply a vacuum suction at point B as before, but only lithe surface is water covered, otherwise air will be drawn into the system.
For construction of suction table commercially, available graded and washed industrial sands witti a narrow particle size distribution are most suitable. The particle size distributions of some suitable wades and the approximate suctions they can attain are given in Table A. 1. It is permissible to use other packing materials sucti as fie glass beads or akiminium oxide powder if they can attain the required air entry values.
NOTE The design 01 the suction table is given as an example.
Two interaboratory rials were organized, one in 195 and one in 2004, under the auspices of the European Commtee for Sltandeardizafon,to test theprocedure specified in this European Standard.
ln both trials the rumber o laboratores given in Tables B.1 to B.10 determined the physical characterisSics in thee dfferert types of samples. umeriliedpealperite, Composted coarse bark and composted straw and domestic sewage were analysed in 1995. Ferlized peat vemicuie groning medum,coarse ocxir dust and composted green waste were analysed in 2004 [4].The samples were tesied as received.
