Download - Calculation of Blower Air Pipe Pressure Loss(Ave)

Sheet1SummaryPressure Loss in Air PipeBlower outletDN 75046.18PaBlower MainDN 1800241.19PaBlower MainDN 1200112.78PaBranchDN 600411.00PaBranchDN 500286.60PaBranchDN 350180.66PaBranchDN 200570.19PaDiffuser loss5,000.00Pa(esimate)(based on min flowrate)Total6848.61Pa(6,200 m3/hr)6.85Kpa

DN 750Air Pressure Loss in Straight Pipe/DuctAir Velocityv=Q/Av=Air velocity(m/s)input dataQ=Air Flow Rate(m3/s)A=Cross Secttional Area(m2)calculated datad=Outer Diameter of Pipe(m)Q=5.49m3/s19,750Nm/hrfixed datad=0.750mA=0.44m2Recommended Air Velocities in Ductsv=12.41m/sDucts and recommended air velocitiesSponsored LinksRe=dvAir flow velocity in ducts should be kept within certain limits to avoid noise and unacceptable friction loss and energy consumption.Low and Medium Pressure DuctsRe=Reynold numbersd=Diameter of pipe(m)Maximum friction rate 0.1 - 0.2 inches W.G./100 ftv=Velocity(m/s)Velocity 1,500 - 2,000 ft/min (8 - 10 m/s)=Air Density(kg/m)=Dynamic or absoulute viscosity(Ns/m)Air Flow RateMaximum Velocity(m3/h)(CFM)(m/s)(ft/min)d=0.750m< 300< 1752.5490v=12.41m/s< 1,000< 5903590=1.23kg/m< 2,000< 1,2004785=1.79X10-5Ns/m< 4,000< 2,3505980< 10,000< 5,90061,180Re=6.40E-05> 10,000> 5,90071,380High Pressure DuctsR=k/dR=Relative Roughness RatioMaximum friction rate less than 0.4 inches W.G./100 ftd=Diameter of pipe(mm)Velocity 2,000 - 3,500 ft/min (10 - 18 m/s)k=Surface Roughness(mm)Shaftsk=0.015mm(From Graph below)Air Flow RateMaximum Velocityd=750mm(m3/h)(CFM)(m/s)(ft/min)R=0.000020< 5,000< 2,950122,350< 10,000< 5,900152,950< 17,000< 10,000173,350< 25,000< 14,700203,940Surface Roughness< 40,000< 23,500224,300SurfaceRoughness - k< 70,000< 41,000254,900millimetersfeet< 100,000< 59,000305,800Copper, Lead, Brass, Aluminum (new)0.001 - 0.0023.33 - 6.7 10-6PVC and Plastic Pipes0.0015 - 0.0070.5 - 2.33 10-5It is common to keep main duct velocity above 20 m/s (3940 ft/min).Epoxy, Vinyl Ester and Isophthalic pipe0.0051.7 10-5Stainless steel0.0155 10-5CorridorsSteel commercial pipe0.045 - 0.091.5 - 3 10-4Air Flow RateMaximum VelocityStretched steel0.0155 10-5(m3/h)(CFM)(m/s)(ft/min)Weld steel0.0451.5 10-4< 5,000< 2,950102,000Galvanized steel0.155 10-4< 10,000< 5,900122,350Rusted steel (corrosion)0.15 - 45 - 133 10-4< 17,000< 10,000152,950New cast iron0.25 - 0.88 - 27 10-4< 25,000< 14,700173,350Worn cast iron0.8 - 1.52.7 - 5 10-3< 40,000< 23,500203,940Rusty cast iron1.5 - 2.55 - 8.3 10-3User AreasSheet or asphalted cast iron0.01 - 0.0153.33 - 5 10-5Smoothed cement0.31 10-3Offices, receptions, lounges and similarOrdinary concrete0.3 - 11 - 3.33 10-3Coarse concrete0.3 - 51 - 16.7 10-3Air Flow RateMaximum VelocityWell planed wood0.18 - 0.96 - 30 10-4(m3/h)(CFM)(m/s)(ft/min)Ordinary wood516.7 10-3< 5,000< 2,950102,000Therefore,< 10,000< 5,900122,350R=0.000020< 17,000< 10,000142,750Re=6.40E-05< 25,000< 14,700163,150The Moody Frictor Factor DiagramFrom the Noody Diagram below=0.014So, total head loss Calculation is stated as below.P-loss=( l/d) ( v2/2)P-loss=Pressure Loss(Pa)(N/m2)=Moody Friction Factorl=Total Length of Pipe(m)=Density(kg/m3)v=Air Velocity(m/s)d=Diameter of Pipe(m)=0.014l=2m=1.23kg/m3v=12.41m/sd=0.75mP-loss=3.54PaTotal Pressure loss for strainght pipe =3.54PaAir Pressure Loss in Pipe Fittings and ComponentsNo.Type of Component or FittingCoefficient of Minor lossNumbers of fittingsTotal- -1Flanged/welded Tees, Line Flow0.200.002Threaded Tees, Line Flow0.900.003Flanged/welded Tees, Branched Flow1.000.004Threaded Tees, Branch Flow2.000.005Threaded Union0.0800.006Flanged/welded Regular 90o Elbows0.310.307Threaded Regular 90o Elbows1.500.008Threaded Regular 45o Elbows0.400.009Flanged/welded Long Radius 90o Elbows0.200.0010Threaded Long Radius 90o Elbows0.700.0011Flanged/welded Long Radius 45o Elbows0.200.0012Threaded Long Radius 45o Elbows0.700.0013Flanged/welded 180o Return Bends0.200.0014Threaded 180o Return Bends1.500.0015Flanged/welded expansion0.400.0016Flanged/welded reducer1.2500.0017Fully Open Globe Valve1000.0018Fully Open Angle Valve200.0019Fully Open Gate/butterfly Valve0.1510.15201/4 Closed Gate/butterfly Valve0.2600.00211/2 Closed Gate/butterfly Valve2.100.00223/4 Closed Gate/butterfly Valve1700.0023Forward Flow Swing Check Valve200.0024Fully Open Ball Valve0.0500.00251/3 Closed Ball Valve5.500.00262/3 Closed Ball Valve20000.00Total loss of coefficient0.45P-loss= v2P-loss=Pressure Loss(Pa)(N/m2)=Minor loss coefficient=Air Density(kg/m3)v=Air velocity(m/s)=0.45=1.23kg/m3v=12.41m/sP-loss=42.64PaTotal Pressure loss for pipe fiitings =42.64PaTherefore,Total Pressure loss for air blower piping system =46.18Pa
Recommended Air Velocities in Ducts

DN 1800Air Pressure Loss in Straight Pipe/DuctAir Velocityv=Q/Av=Air velocity(m/s)input dataQ=Air Flow Rate(m3/s)A=Cross Secttional Area(m2)calculated datad=Outer Diameter of Pipe(m)Q=21.94m3/s79,000Nm/hrfixed datad=1.800mA=2.55m2v=8.62m/sRe=dvRe=Reynold numbersd=Diameter of pipe(m)v=Velocity(m/s)=Air Density(kg/m)=Dynamic or absoulute viscosity(Ns/m)d=1.800mv=8.62m/s=1.23kg/m=1.79X10-5Ns/mRe=1.07E-04R=k/dR=Relative Roughness Ratiod=Diameter of pipe(mm)k=Surface Roughness(mm)k=0.015mm(From Graph below)d=1800mmR=0.000008Surface RoughnessSurfaceRoughness - kmillimetersfeetCopper, Lead, Brass, Aluminum (new)0.001 - 0.0023.33 - 6.7 10-6PVC and Plastic Pipes0.0015 - 0.0070.5 - 2.33 10-5Epoxy, Vinyl Ester and Isophthalic pipe0.0051.7 10-5Stainless steel0.0155 10-5Steel commercial pipe0.045 - 0.091.5 - 3 10-4Stretched steel0.0155 10-5Weld steel0.0451.5 10-4Galvanized steel0.155 10-4Rusted steel (corrosion)0.15 - 45 - 133 10-4New cast iron0.25 - 0.88 - 27 10-4Worn cast iron0.8 - 1.52.7 - 5 10-3Rusty cast iron1.5 - 2.55 - 8.3 10-3Sheet or asphalted cast iron0.01 - 0.0153.33 - 5 10-5Smoothed cement0.31 10-3Ordinary concrete0.3 - 11 - 3.33 10-3Coarse concrete0.3 - 51 - 16.7 10-3Well planed wood0.18 - 0.96 - 30 10-4Ordinary wood516.7 10-3Therefore,R=0.000008Re=1.07E-04The Moody Frictor Factor DiagramFrom the Noody Diagram below=0.02So, total head loss Calculation is stated as below.P-loss=( l/d) ( v2/2)P-loss=Pressure Loss(Pa)(N/m2)=Moody Friction Factorl=Total Length of Pipe(m)=Density(kg/m3)v=Air Velocity(m/s)d=Diameter of Pipe(m)=0.02l=70m=1.23kg/m3v=8.62m/sd=1.80mP-loss=35.54PaTotal Pressure loss for strainght pipe =35.54PaAir Pressure Loss in Pipe Fittings and ComponentsNo.Type of Component or FittingCoefficient of Minor lossNumbers of fittingsTotal- -1Flanged/welded Tees, Line Flow0.271.402Threaded Tees, Line Flow0.900.003Flanged/welded Tees, Branched Flow1.000.004Threaded Tees, Branch Flow2.000.005Threaded Union0.0800.006Flanged/welded Regular 90o Elbows0.320.607Threaded Regular 90o Elbows1.500.008Threaded Regular 45o Elbows0.400.009Flanged/welded Long Radius 90o Elbows0.200.0010Threaded Long Radius 90o Elbows0.700.0011Flanged/welded Long Radius 45o Elbows0.200.0012Threaded Long Radius 45o Elbows0.700.0013Flanged/welded 180o Return Bends0.200.0014Threaded 180o Return Bends1.500.0015Flanged/welded expansion0.400.0016Flanged/welded reducer1.2522.5017Fully Open Globe Valve1000.0018Fully Open Angle Valve200.0019Fully Open Gate/butterfly Valve0.1500.00201/4 Closed Gate/butterfly Valve0.2600.00211/2 Closed Gate/butterfly Valve2.100.00223/4 Closed Gate/butterfly Valve1700.0023Forward Flow Swing Check Valve200.0024Fully Open Ball Valve0.0500.00251/3 Closed Ball Valve5.500.00262/3 Closed Ball Valve20000.00Total loss of coefficient4.50P-loss= v2P-loss=Pressure Loss(Pa)(N/m2)=Minor loss coefficient=Air Density(kg/m3)v=Air velocity(m/s)=4.50=1.23kg/m3v=8.62m/sP-loss=205.64PaTotal Pressure loss for pipe fiitings =205.64PaTherefore,Total Pressure loss for air blower piping system =241.19Pa

DN 1200Air Pressure Loss in Straight Pipe/DuctAir Velocityv=Q/Av=Air velocity(m/s)input dataQ=Air Flow Rate(m3/s)A=Cross Secttional Area(m2)calculated datad=Outer Diameter of Pipe(m)Q=10.97m3/s39,500Nm/hrfixed datad=1.200mA=1.13m2v=9.70m/sRe=dvRe=Reynold numbersd=Diameter of pipe(m)v=Velocity(m/s)=Air Density(kg/m)=Dynamic or absoulute viscosity(Ns/m)d=1.200mv=9.70m/s=1.23kg/m=1.79X10-5Ns/mRe=8.00E-05R=k/dR=Relative Roughness Ratiod=Diameter of pipe(mm)k=Surface Roughness(mm)k=0.015mm(From Graph below)d=1200mmR=0.000013Surface RoughnessSurfaceRoughness - kmillimetersfeetCopper, Lead, Brass, Aluminum (new)0.001 - 0.0023.33 - 6.7 10-6PVC and Plastic Pipes0.0015 - 0.0070.5 - 2.33 10-5Epoxy, Vinyl Ester and Isophthalic pipe0.0051.7 10-5Stainless steel0.0155 10-5Steel commercial pipe0.045 - 0.091.5 - 3 10-4Stretched steel0.0155 10-5Weld steel0.0451.5 10-4Galvanized steel0.155 10-4Rusted steel (corrosion)0.15 - 45 - 133 10-4New cast iron0.25 - 0.88 - 27 10-4Worn cast iron0.8 - 1.52.7 - 5 10-3Rusty cast iron1.5 - 2.55 - 8.3 10-3Sheet or asphalted cast iron0.01 - 0.0153.33 - 5 10-5Smoothed cement0.31 10-3Ordinary concrete0.3 - 11 - 3.33 10-3Coarse concrete0.3 - 51 - 16.7 10-3Well planed wood0.18 - 0.96 - 30 10-4Ordinary wood516.7 10-3Therefore,R=0.000013Re=8.00E-05The Moody Frictor Factor DiagramFrom the Noody Diagram below=0.018So, total head loss Calculation is stated as below.P-loss=( l/d) ( v2/2)P-loss=Pressure Loss(Pa)(N/m2)=Moody Friction Factorl=Total Length of Pipe(m)=Density(kg/m3)v=Air Velocity(m/s)d=Diameter of Pipe(m)=0.018l=20m=1.23kg/m3v=9.70m/sd=1.20mP-loss=17.35PaTotal Pressure loss for strainght pipe =17.35PaAir Pressure Loss in Pipe Fittings and ComponentsNo.Type of Component or FittingCoefficient of Minor lossNumbers of fittingsTotal- -1Flanged/welded Tees, Line Flow0.220.402Threaded Tees, Line Flow0.900.003Flanged/welded Tees, Branched Flow1.000.004Threaded Tees, Branch Flow2.000.005Threaded Union0.0800.006Flanged/welded Regular 90o Elbows0.300.007Threaded Regular 90o Elbows1.500.008Threaded Regular 45o Elbows0.400.009Flanged/welded Long Radius 90o Elbows0.200.0010Threaded Long Radius 90o Elbows0.700.0011Flanged/welded Long Radius 45o Elbows0.200.0012Threaded Long Radius 45o Elbows0.700.0013Flanged/welded 180o Return Bends0.200.0014Threaded 180o Return Bends1.500.0015Flanged/welded expansion0.400.0016Flanged/welded reducer1.2511.2517Fully Open Globe Valve1000.0018Fully Open Angle Valve200.0019Fully Open Gate/butterfly Valve0.1500.00201/4 Closed Gate/butterfly Valve0.2600.00211/2 Closed Gate/butterfly Valve2.100.00223/4 Closed Gate/butterfly Valve1700.0023Forward Flow Swing Check Valve200.0024Fully Open Ball Valve0.0500.00251/3 Closed Ball Valve5.500.00262/3 Closed Ball Valve20000.00Total loss of coefficient1.65P-loss= v2P-loss=Pressure Loss(Pa)(N/m2)=Minor loss coefficient=Air Density(kg/m3)v=Air velocity(m/s)=1.65=1.23kg/m3v=9.70m/sP-loss=95.43PaTotal Pressure loss for pipe fiitings =95.43PaTherefore,Total Pressure loss for air blower piping system =112.78Pa

DN 600Air Pressure Loss in Straight Pipe/DuctAir Velocityv=Q/Av=Air velocity(m/s)input dataQ=Air Flow Rate(m3/s)A=Cross Secttional Area(m2)calculated datad=Outer Diameter of Pipe(m)Q=3.66m3/s13,162Nm/hrfixed datad=0.600mA=0.28m2v=12.93m/sRe=dvRe=Reynold numbersd=Diameter of pipe(m)v=Velocity(m/s)=Air Density(kg/m)=Dynamic or absoulute viscosity(Ns/m)d=0.600mv=12.93m/s=1.23kg/m=1.79X10-5Ns/mRe=5.33E-05R=k/dR=Relative Roughness Ratiod=Diameter of pipe(mm)k=Surface Roughness(mm)k=0.015mm(From Graph below)d=600mmR=0.000025Surface RoughnessSurfaceRoughness - kmillimetersfeetCopper, Lead, Brass, Aluminum (new)0.001 - 0.0023.33 - 6.7 10-6PVC and Plastic Pipes0.0015 - 0.0070.5 - 2.33 10-5Epoxy, Vinyl Ester and Isophthalic pipe0.0051.7 10-5Stainless steel0.0155 10-5Steel commercial pipe0.045 - 0.091.5 - 3 10-4Stretched steel0.0155 10-5Weld steel0.0451.5 10-4Galvanized steel0.155 10-4Rusted steel (corrosion)0.15 - 45 - 133 10-4New cast iron0.25 - 0.88 - 27 10-4Worn cast iron0.8 - 1.52.7 - 5 10-3Rusty cast iron1.5 - 2.55 - 8.3 10-3Sheet or asphalted cast iron0.01 - 0.0153.33 - 5 10-5Smoothed cement0.31 10-3Ordinary concrete0.3 - 11 - 3.33 10-3Coarse concrete0.3 - 51 - 16.7 10-3Well planed wood0.18 - 0.96 - 30 10-4Ordinary wood516.7 10-3Therefore,R=0.000025Re=5.33E-05The Moody Frictor Factor DiagramFrom the Noody Diagram below=0.015So, total head loss Calculation is stated as below.P-loss=( l/d) ( v2/2)P-loss=Pressure Loss(Pa)(N/m2)=Moody Friction Factorl=Total Length of Pipe(m)=Density(kg/m3)v=Air Velocity(m/s)d=Diameter of Pipe(m)=0.015l=114m=1.23kg/m3v=12.93m/sd=0.60mP-loss=292.84PaTotal Pressure loss for strainght pipe =292.84PaAir Pressure Loss in Pipe Fittings and ComponentsNo.Type of Component or FittingCoefficient of Minor lossNumbers of fittingsTotal- -1Flanged/welded Tees, Line Flow0.210.202Threaded Tees, Line Flow0.900.003Flanged/welded Tees, Branched Flow1.000.004Threaded Tees, Branch Flow2.000.005Threaded Union0.0800.006Flanged/welded Regular 90o Elbows0.300.007Threaded Regular 90o Elbows1.500.008Threaded Regular 45o Elbows0.400.009Flanged/welded Long Radius 90o Elbows0.200.0010Threaded Long Radius 90o Elbows0.700.0011Flanged/welded Long Radius 45o Elbows0.200.0012Threaded Long Radius 45o Elbows0.700.0013Flanged/welded 180o Return Bends0.200.0014Threaded 180o Return Bends1.500.0015Flanged/welded expansion0.400.0016Flanged/welded reducer1.2500.0017Fully Open Globe Valve1000.0018Fully Open Angle Valve200.0019Fully Open Gate/butterfly Valve0.1510.15201/4 Closed Gate/butterfly Valve0.2600.00211/2 Closed Gate/butterfly Valve2.100.00223/4 Closed Gate/butterfly Valve1700.0023Forward Flow Swing Check Valve200.0024Fully Open Ball Valve0.0500.00251/3 Closed Ball Valve5.500.00262/3 Closed Ball Valve20000.0027Flowmeter0.810.80Total loss of coefficient1.15P-loss= v2P-loss=Pressure Loss(Pa)(N/m2)=Minor loss coefficient=Air Density(kg/m3)v=Air velocity(m/s)=1.15=1.23kg/m3v=12.93m/sP-loss=118.16PaTotal Pressure loss for pipe fiitings =118.16PaTherefore,Total Pressure loss for air blower piping system =411.00Pa




Download - Calculation of Blower Air Pipe Pressure Loss(Ave)

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