m. 10 m. 30 n= = 3,20 8,33 2,6 A= = 2,77 l/s = V N 8,33 3 CAPACITY IN LITRES/SEC OF PIPES WITH DIFFERENT GRADIENT SETTINGS TABLE 1 Ø PVC PIPES IN mm. CAPACITY in litre/sec. PERCENTAGE GRADIENT 40 50 63 75 80 100 125 140 160 200 250 315 0,5% 1% 1,5% 2% 3% 5% 10% CAPACITY IN LITRES/SECOND OF THE GRILLS TABLE 2 SGN20 SGP20 SGN25 SGN30 SGP30 SGN40 SGP40 SG45 SGP45 SG55 SGP55 SG3050 SGP3050 SG4050 SGP4050 1,6 2,0 2,5 3,2 4,0 4,4 3,5 3,9 0,17 0,35 0,71 1,19 1,43 2,76 5,18 6,89 9,72 16,92 30,05 54,44 0,24 0,50 1,01 1,61 2,03 3,90 7,33 9,75 13,75 24,00 42,50 77,00 0,29 0,61 1,24 2,07 2,49 4,78 8,98 11,94 16,84 29,39 52,05 94,30 0,34 0,71 1,43 2,39 2,87 5,51 10,37 13,79 19,44 33,94 60,10 108,89 0,41 0,87 1,75 2,93 3,52 6,75 12,69 16,89 23,81 41,57 73,61 133,36 0,54 1,12 2,26 3,78 4,54 8,72 16,39 21,80 30,74 53,66 95,03 172,18 0,76 1,58 3,14 5,34 6,41 12,33 23,18 30,83 43,48 75,89 134,40 243,49 DRAINING CALCULATIONS AND TECHNICS 9 EXAMPLE 1: witch the SG30 grill (which has a capacity of 2,6 l/s) you get which must be made round to 4. m. 10 EXAMPLE 2: you can also start knowing the number of grills to be set up and obtain their size by the water to be drained and the capacity of the chosen grill. If, for example, you just want to set up 3 grills instead of 4you can determine their capacity by the following formula: Referring to norm UNI EN 12056-3 the capacities referring to new pipes have been reduced to take into account the partial obstruction of pipes mainly due to low gradient, and the build up of material on the walls as a consequence of transporting turbid water. Also it is not advisable to use pipes with a diameter less than 100mm for horizontal drainage, especially in the presence of turbid waters or waters transporting waste. picture 3 shows that it’s necessary to set SG40 grill (the smallest grill with a capacity of more than 2,77 1/s)
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