Bailey Technical Catalogue - Safety Systems UK Ltd

Estimated Air capacities – multiply chart capacities as follows:(1) Multiply chart capacity by 0.66 to give Air flow in SCFM(2) Multiply chart capacity by 1.2 to give Air flow in Nm 3 /hEstimated Air pressure drops:For guidance multiply the chart pressure drop by 1.23 to give an approximate Air pressure drop.Note (1) Figures in blue italics show pressure drops (Barg) for equivalent lengths equal to360 pipe diameters. When using this table, allowance should be made for the effects of bends andfittings in the pipe line.Note (2) All capacity values are based on acceptable pressure drops, not velocity per unit lengthof pipe. Higher pressure drops will result in higher steam velocities and increased noise levels.ExampleQuestion: What size pipe will pass 800 kg/h of dry saturated steam at 7 Barg?50mm pipe will pass 864 kg/h at 7 Barg (Pressure drop over 18m (360 pipe diameters) will be approximately 0.19 Barg).71