CC-1000_2018

CC-1000 Companion Guidance (1-2018) CC-1000 Companion Guidance CG Page of 12 Informational 7 CC-1000 Discussion 5.7 Soil gas Inlets and flow capacity Air transfer locations for soil gas into vent piping must be open to a total of twice the size of pore openings between stone granules as compared to the open cross-sectional area of the duct pipe specified for the plenum. This optimizes air transfer. 5.7.1 Individual inlet minimum capacity (gravel) REFERENCE TABLE 1 Gravel — Inlet Air Transfer Capacity for Soil Gas * Air pathways between granules are calculated based on aggregates that contain less than 5% fines to result in an unobstructed void around each grain that is nominally 21.5% of the surface area dimension, which is otherwise obstructed by the grain. Inlet Air Transfer Capacity of Soil Gas from Gravel inch cm sq in cm 2 Inch cm sq in cm 2 Inch cm 3 7.6 7.1 45.6 0.50 1.3 335 2,161 15 37 0.63 1.6 214 1,383 12 30 0.75 1.9 149 960 10 25 1.50 3.8 37 240 5 12 Inch cm sq in cm 2 Inch cm sq in cm 2 Inch cm 4 10.2 12.6 81.0 0.50 1.3 595 3,841 19 49 178% bigger than 3" pipe 0.63 1.6 381 2,458 16 40 0.75 1.9 265 1,707 13 33 1.50 3.8 66 427 6 16 Inch cm sq in cm 2 Inch cm sq in cm 2 Inch cm 6 15.2 28.3 182.3 0.50 1.3 1,340 8,642 29 74 225% bigger than 4" pipe 0.63 1.6 857 5,531 23 59 0.75 1.9 595 3,841 19 49 1.50 3.8 149 960 10 25 Inch cm sq in cm 2 Inch cm sq in cm 2 Inch cm 8 20.3 50.2 324.1 0.50 1.3 2,381 15,364 39 99 178% bigger than 6" pipe 0.63 1.6 1,524 9,833 31 79 0.75 1.9 1,058 6,828 26 66 1.50 3.8 265 1,707 13 33 Inch cm sq in cm 2 Inch cm sq in cm 2 Inch cm 10 25.4 78.5 506.5 0.50 1.3 3,721 24,006 49 124 156% bigger than 8" pipe 0.63 1.6 2,381 15,364 39 99 0.75 1.9 1,654 10,669 32 82 1.50 3.8 413 2,667 16 41 Inch cm sq in cm 2 Inch cm sq in cm 2 Inch cm 12 30.5 113.0 729.3 0.50 1.3 5,358 34,569 58 148 144% bigger than 10" pipe 0.63 1.6 3,429 22,124 47 119 0.75 1.9 2,381 15,364 39 99 1.50 3.8 595 3,841 19 49 Cross-sectional Area Gravel Grain Size * Air pathways between granules ar calculated based on aggregates that contain less than 5% fines to result in an unobstructed void around each grain that is nominally 21.5% of the surface area dimension that is otherwise obstructed by the grain. Pit Diameter in 4" Gravel Specified Gravel Aggregate 2 x Equivalent Inlet Area * (Gravel Face) Duct Pipe Nominal I.D.