Tideflex_Model_SST-01-02_Rev1.pdf
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- Solicitation number
- 26-026-ITB
- Issued by
- Hart County, Kentucky
About this file
This is a Diffused Aeration System Modeling Program document prepared for the Cincinnati/Northern Kentucky International Airport (CVG) Wastewater Treatment Plant, specifically addressing the design of a Coarse Bubble Mixing and Oxygen System for Sludge Storage Tanks No. 2 and No. 3. The document, prepared by Tideflex Technologies in collaboration with Hydro Controls (Milford, Ohio), provides detailed engineering design calculations and specifications for the aeration system. The project involves the modeling and design of air diffusion equipment to support wastewater treatment operations at the airport facility. The document was created on June 27, 2025, as Revision 1 (Initial Design) and incorporates input data for biological and chemical process systems design. The Kenton County Airport Board is proceeding with procurement for Two (2) Digester Tanks Aeration Equipment Replacement, with a pre-bid meeting and site visit scheduled for Thursday, April 23, 2026 at 10:00 am at CVG Centre, Admin. Offices, 77 Comair Boulevard, Erlanger, Kentucky 41018. Questions must be submitted by 11:59 pm on Monday, April 27, 2026, with answers posted by Thursday, April 30, 2026 at 11:59 pm. Sealed bids are due by Thursday, May 7, 2026 at 2:00 pm.
The modeling document specifies critical design parameters for the aeration system, including two TFA-3.00 Coarse Bubble Diffusers serving tanks with 113-foot diameters and 14.95-foot depths (approximately 1.12 million gallons each). The design calls for a total airflow requirement of 7,600 cubic feet per minute (cfm) distributed across two operating blowers at 3,800 cfm each, with blower brake horsepower requirements of 209 HP per unit. The system is designed to achieve an Actual Oxygen Requirement (AOR) of 5,664 pounds per day (2,569 kg/day) based on an oxygen uptake rate of 12.62 milligrams per liter per hour. Design specifications include a diffuser depth of 0.25 feet, site elevation of 840 feet above mean sea level with a barometric pressure of 14.26 psia, and process water conditions at 68 degrees Fahrenheit with 4.0 percent solids concentration. The comprehensive piping analysis indicates headloss calculations across drop pipe sections (1.21 inches), distribution piping (3.76 inches for manifold and 1.56 inches for branch lines), and diffuser orifices (5.00 inches), with a total system headloss of 195.87 inches.
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Company/Agency Name:
Facility Name:
Location:
Contact:
Email:
Consulting Firm:
Location:
Contact:
Email:
Tideflex Representative:
@ Engineering / Design Location
Contact:
Email:
Tideflex Representative:
@ Equipment Installation Location
Contact:
Email:
Revision Date:
Revision Description:
Diffused Aeration System Modeling Program
Hydro Controls Milford, OH
Airport WWTF Operations
Cincinnati / Northern Kentucky International Airport Sludge Storage Tank No.2 & No.3 - Coarse Bubble Mixing & O2 System
Wastewater Treatment Plant Cincinnati / Northern Kentucky International Airport
DESIGN FOR MIXING & O2
PHONE (412) 279-0044
750 Holiday Drive, Suite 400, Pittsburgh, PA 15220
Revision 1 - Initial Design
Adam McCarthy
6/27/2025 9:28 amccarthy@hydrocontrols.net
Hydro Controls Milford, OH Adam McCarthy amccarthy@hydrocontrols.net
Model Version:02-01-2025 I:\Engineering\TAD (Air Diffusers)\Projects\USA\Cincinnati (CVG) Airport, KY\2025 Sludge Tanks\Model\Tideflex Aeration Model_Rev1.xlsm
0.0 gpd 0.00 m3/day
0.0 mg/l
0.0 mg/l
0.0 mg/l
0.0 mg/l
0.0 mg/l
0.0 mg/l
1.10 lbs O2/lb BOD 0.499 kg O2/kg BOD
4.30 lbs O2/lb BOD 1.950 kg O2/kg BOD
MLSS Concentration for Activated Sludge Process 0 mg/l 0.20
0.0 lbs/day 0.0 kg/day
12.62 mg/l/hr 12.00 mg/l/hr (Recommended for this Process Fluid) Process Fluid Solids Concentration 4.00 % Solids
Alpha Factor 0.30 % Transfer Adjustment @ Solids Concentration
0.25 ft. 0.1 m Diffuser Depth (Dp) 14.70 ft. 4.5 m
Site Elevation above Mean Sea Level 840.0 ft. 256.0 m Barometric Pressure at Site (Pa) 29.04 in Hg 14.26 psia 98.336 kPa
Barometric Pressure at Mean Sea Level (Pmsl) 29.92 in Hg 14.70 psia 101.320 kPa Process Water Salinity 0.00 ppt
Surface Oxygen Saturation at 20 C (Cs) 9.09 mg/l Surface Oxygen Saturation at Temp (Cst) 9.09 mg/l Residual Dissolved Oxygen Level (DO) 1.00 mg/l
Waste Water Temperature (T) 68 F 20.0 C Fine Bubble Coarse Bubble
Model Number TFX-STYLE-1 TFA-3.00 Alpha Factor 0.45 Beta Factor 0.950 Beta Factor 0.950
Theta Factor 1.024 Theta Factor 1.024 Depth Correction Factor (f) 0.40 0.25
Corrected Saturation at Std. for Depth (Css) 10.67 mg/l 10.08 mg/l Corrected Saturation at Temp. for Depth (Csw) 10.40 mg/l 9.81 mg/l
Inlet Blower Air Temperature at the Site 100 F 37.7 C Saturated Vapor Pressure at Site Temperature 0.9503 psia 6.552 kPa
Relative Humidity at the Site 50% Applied Blower Efficiency 55%
Pressure at Standard Conditions 14.70 psia 101.354 kPa Temperature at Standard Conditions 68 F 20.0 C
Saturated Vapor Pressure at Standard Temperature 0.3391 psia 2.338 kPa Relative Humidity at Standard Conditions 36%
Density of Air at Standard Conditions 0.075 lbs/ft^3 1.201 kg/m3 Density of Air Correction factor 0.8917
Corrected Density of Air at Site Elevation & Temp 0.0669 lbs/ft^3 1.071 kg/m3
Process Design Values
Oxygen Transfer Efficiency Values
Blower Parameters
Food to BioMass ratio F/M
Diffuser Variables
Oxygen Supply Rate provided at design airflow rate
Diffuser distance from base of Tank
Lbs of Oxygen required per lb. Of BOD removed Lbs of Oxygen Required per lb. Of NH3 removed
Pre-Determined AOR Value to be Applied
Design BOD influent concentration
Influent / Effluent Concentrations
Design NH4 influent concentration Design NH4 effluent concentration
Design BOD effluent concentration
Cincinnati / Northern Kentucky International Airport Sludge Storage Tank No.2 & No.3 - Coarse Bubble Mixing & O2 System
Input Data & Design Parameters for Biological / Chemical Process Systems
Design COD effluent concentration
DESIGN FOR MIXING & O2
Design Plant Flowrate Design COD influent concentration
Disclaimer: The calculations, projections and values produced within this model are based upon the applied site specific values as shown on the Input Data page and any other related pages. These site specific values may have been provided by the facility owner, consulting engineer or derived from industry standards. Any variance in these values will effect the projections produced within this model. This model is intended to provide design guidance related to the operation of the Tideflex System and/or Tideflex components. Air Diffuser data applied within the model is derived from certified performance curves for headloss and oxygen transfer capacity under standard conditions for ASCE testing. All conversions applied within the model for determining the effectiveness in specific process fluids, as compared to clean water testing, are intended as a projection of the actual conditions expected. Tideflex Technologies shall not be responsible for the accuracy of these projected conditions.
6/27/2025 Tideflex Engineered Systems
A Division of Red Valve Company, Inc. Page 2 of 10
US UNITS
Vertical Aeration Additional Aeration Aeration Sidewall Conical Surface Conical Dimensional Liquid Percentage
Tank Diameter Depth Depth Area Volume Volume Volume of AOR feet feet feet sq. ft. cubic feet cubic feet gallons Distrib.
SST-02 113.00 14.95 0.00 10,029 0 149,930 1,121,475 50%
SST-03 113.00 14.95 0.00 10,029 0 149,930 1,121,475 50%
20,057 299,860 2,242,950 100% sq.ft. cuft gallons
SI UNITS
Aeration Additional Aeration Aeration
Conical Surface Conical Dimensional Liquid Percentage Tank Diameter Depth Depth Area Volume Volume Volume of AOR meters meters meters sq. meters meter^3 cubic meters liters Distrib.
SST-02 34.44 4.56 0.00 932 0 4,245 4,244,783 50%
SST-03 34.44 4.56 0.00 932 0 4,245 4,244,783 50%
1,863 8,491 8,489,565 100% sq.m. cu.m L
Cincinnati / Northern Kentucky International Airport Sludge Storage Tank No.2 & No.3 - Coarse Bubble Mixing & O2 System
CIRCULAR TANK DIMENSIONS
DESIGN FOR MIXING & O2
6/27/2025
A Division of Red Valve Company, Inc. Page 3 of 10
Applied Values Specific Weight = 62.3156 lb/ft^3
Velocity Dynamic Dynamic Viscosity = 4.25E-05 lbf-s/ft^2 Gradient Viscosity Fluid Temp = 68.00 F G (sec-1) lbf-s/ft^2
Water Level Surge 90-120 15 cfm/1000 cuft for Equalization Tank 2.01E-05 Off Gas Rise Rate = 2.00 ft/sec 90-120 20 cfm/1000 cuft for Aeration Tank to 2500 mg/l MLSS 2.35E-05 Volume of Air in Liquid = 465.50 cuft 90-120 25 cfm/1000 cuft for Aeration Tank to 4500 mg/l MLSS 2.70E-05 Liquid Level Increase = 0.56 inches 90-120 28 cfm/1000 cuft for Aeration Tank to 6500 mg/l MLSS 3.05E-05 90-120 30 cfm/1000 cuft for Aerobic Sludge to 1% solids 3.40E-05 MLSS Concentration = 0 mg/l 90-120 35 cfm/1000 cuft for Aerobic Sludge to 2% solids 3.75E-05 Solids Concentration = 4.0 % Solids 90-120 40 cfm/1000 cuft for Aerobic Sludge to 3% solids 4.00E-05 90-120 45 cfm/1000 cuft for Aerobic Sludge to 4% solids 4.25E-05
Coarse Bubble Volume Volume Diffusers
Tank cu.ft. cu.m. cfm/1000 cuft m3/hr/m3 cfm m3/hr cfm m3/hr
SST-02 149,930 4,245 25.35 1.521 3,800.00 6456.18 15.83 26.901 240.0
SST-03 149,930 4,245 25.35 1.521 3,800.00 6456.18 15.83 26.901 240.0
299,859.60 8491.0 7,600.00 12,912.36 480 cu.ft. cu.m. cfm m3/hr units
Volume Volume Depth Depth Tank cu.ft. cu.m. feet meters ft-lb/sec kW
SST-02 149,930 4,245 15 5 48,979 66.41 88
SST-03 149,930 4,245 15 5 48,979 66.41 88
Cincinnati / Northern Kentucky International Airport Sludge Storage Tank No.2 & No.3 - Coarse Bubble Mixing & O2 System
Airflow Rate Required
Airflow Required for Complete Mixing - Volume Ratio & Gradient Velocity Design Comparison
COARSE BUBBLE DIFFUSER SYSTEM
Design Unit Air Flowrate
Recommended Design Values for Mixing Airflow per Volume Ratio cfm per 1000 cuft liquid
Volume Ratio Mixing Design
Diffuser Model
TFA-3.00
DESIGN FOR MIXING & O2
Velocity Gradient Mixing Design
G, sec-1
Air Flowrate per Diffuser
Equivalent Power
Mean-Squared Velocity Gradient
6/27/2025
A Division of Red Valve Company, Inc. Page 4 of 10
AOR = Actual Oxygen Transferred into wastewater solution SOTR = Oxygen transfer rate based on clean water
AOR / SOTR Ratio 24.8% Airflow per Airflow per Efficiency Total Coarse
Tank AOR AOR SOTR SOTR Airflow Airflow Diffuser Diffuser per foot Diffuser Bubble No. kg/hr lbs/hr kg/hr lbs/hr m3/hr cfm cfm m3/hr depth Efficiency Diffusers
SST-02 53.53 118.01 216.15 476.51 6,456.96 3,800.00 15.8 26.904 0.825% 12.13% 240.0 SST-03 53.53 118.01 216.15 476.51 6,456.96 3,800.00 15.8 26.904 0.825% 12.13% 240.0
107.06 236.02 432.29 953.03 12,913.92 7,600.00 480 kg/hr lbs/hr kg/hr lbs/hr m3/hr cfm units
MLSS Concentration for Activated Sludge Process = 0 mg/l Sludge Process Solids Concentration = 4.00 % Solids
Cincinnati / Northern Kentucky International Airport Sludge Storage Tank No.2 & No.3 - Coarse Bubble Mixing & O2 System
COARSE BUBBLE DIFFUSER SYSTEM
Oxygen Mass Transfer Rates at Applied Airflow
DESIGN FOR MIXING & O2
6/27/2025
A Division of Red Valve Company, Inc. Page 5 of 10
AOR1 AOR as Specified by Owner/Engineer 0 lbs./day 0 kg./day
AOR2 AOR for BOD & NH3 Removal 0 lbs./day 0 kg/day
AOR3 AOR for COD Removal 0 lbs./day 0 kg/day
AOR4 AOR for Post Aeration 0 lbs./day 0 kg/day
AOR5 AOR for Aerobic Digestion 0 lbs./day 0 kg./day
AOR6 AOR per Uptake Rate 5,664 lbs./day 2,569 kg/day
Oxygen Uptake Rate Applied 12.62 mg/l/hr 12.00 mg/l/hr (Recommended for this Process Fluid)
AOR Applied for Design* 5,664 lbs./day 2,569 kg/day AOR Conversion 236.02 lbs/hr (24 hr. day) 107.06 kg/hr (24 hr. day)
* (Maximum Value of AOR1, AOR2, AOR3, AOR4, AOR5 & AOR6)
Selected - Actual Oxygen Required (AOR) Based on an Maximum Value listed below
Sludge Storage Tank No.2 & No.3 - Coarse Bubble Mixing & O2 System Cincinnati / Northern Kentucky International Airport
DESIGN FOR MIXING & O2
6/27/2025
A Division of Red Valve Company, Inc. Page 6 of 10
Specific Weight of Air 0.0669 lb/ft^3 Beginning Flowrate 3700.00 cfm Density of Air 0.00208 slug/ft^3 Ending Flowrate 3800.00 cfm Air Temp in pipe 180.00 deg. F Flowrate Increments 5.00 cfm
20 Total Values Maximum 20.00
Absolute Roughness 1.50E-04 E Linear Length of Discharge 70.00 feet Relative Roughness 1.286E-04 E/D Equivalent Length of Fittings 35.00 feet Discharge Line Nominal Diameter 14.00 inches Equivalent Length of Discharge 105.00 feet Actual Inside Diameter (Disch.) 13.624 inches
Airflow Pipe I.D. Velocity Headloss Headloss Nominal Recommended cfm inches fpm psi inch - H20 Pipe Diameter Max. Velocity
3700.00 13.624 3654.1 0.041 1.15 inches fpm
3705.00 13.624 3659.1 0.042 1.15
3710.00 13.624 3664.0 0.042 1.16 2.00 2790
3715.00 13.624 3668.9 0.042 1.16 3.00 3025
3720.00 13.624 3673.9 0.042 1.16 4.00 3400
3725.00 13.624 3678.8 0.042 1.16 6.00 3495
3730.00 13.624 3683.8 0.042 1.17 8.00 3750
3735.00 13.624 3688.7 0.042 1.17 10.00 3970
3740.00 13.624 3693.6 0.042 1.17 12.00 4200
3745.00 13.624 3698.6 0.042 1.18 14.00 4450
3750.00 13.624 3703.5 0.042 1.18 16.00 4695
3755.00 13.624 3708.4 0.043 1.18 18.00 4950
3760.00 13.624 3713.4 0.043 1.19 20.00 5175
3765.00 13.624 3718.3 0.043 1.19 22.00 5410
3770.00 13.624 3723.3 0.043 1.19 24.00 5970
3775.00 13.624 3728.2 0.043 1.19
3780.00 13.624 3733.1 0.043 1.20
3785.00 13.624 3738.1 0.043 1.20
3790.00 13.624 3743.0 0.043 1.20
3795.00 13.624 3747.9 0.043 1.21
3800.00 13.624 3752.9 0.044 1.21
Cincinnati / Northern Kentucky International Airport Sludge Storage Tank No.2 & No.3 - Coarse Bubble Mixing & O2 System
SYSTEM HEADLOSS THROUGH DROP PIPE SECTION
PIPING DATA
FLOW DATA
EQUIVALENT LENGTHS
AIR DATA
SYSTEM CURVE HEADLOSS OUTPUT
A Division of Red Valve Company, Inc. Page 7 of 10
Specific Weight of Air 0.0669 lb/ft^3 Beginning Flowrate 1150.00 cfm Density of Air 0.00208 slug/ft^3 Ending Flowrate 1250.00 cfm Air Temp in pipe 140.00 deg. F Flowrate Increments 5.00 cfm
20 Total Values Maximum 20.00
Absolute Roughness 1.50E-04 E Linear Length of Discharge 100.00 feet Relative Roughness 2.250E-04 E/D Equivalent Length of Fittings 35.00 feet Discharge Line Nominal Diameter 8.00 inches Equivalent Length of Discharge 135.00 feet Actual Inside Diameter (Disch.) 8.329 inches
Airflow Pipe I.D. Velocity Headloss Headloss Nominal Recommended cfm inches fpm psi inch - H20 Pipe Diameter Max. Velocity
1150.00 8.329 3038.8 0.068 1.88 inches fpm
1155.00 8.329 3052.0 0.068 1.90
1160.00 8.329 3065.2 0.069 1.91 2.00 2790
1165.00 8.329 3078.4 0.069 1.93 3.00 3025
1170.00 8.329 3091.7 0.070 1.94 4.00 3400
1175.00 8.329 3104.9 0.071 1.96 6.00 3495
1180.00 8.329 3118.1 0.071 1.97 8.00 3750
1185.00 8.329 3131.3 0.072 1.99 10.00 3970
1190.00 8.329 3144.5 0.072 2.01 12.00 4200
1195.00 8.329 3157.7 0.073 2.02 14.00 4450
1200.00 8.329 3170.9 0.073 2.04 16.00 4695
1205.00 8.329 3184.1 0.074 2.05 18.00 4950
1210.00 8.329 3197.4 0.075 2.07 20.00 5175
1215.00 8.329 3210.6 0.075 2.09 22.00 5410
1220.00 8.329 3223.8 0.076 2.10 24.00 5970
1225.00 8.329 3237.0 0.076 2.12
1230.00 8.329 3250.2 0.077 2.13
1235.00 8.329 3263.4 0.077 2.15
1240.00 8.329 3276.6 0.078 2.17
1245.00 8.329 3289.8 0.079 2.18 3.30 inches
1250.00 8.329 3303.1 0.079 2.20
AIR DATA
Cincinnati / Northern Kentucky International Airport Sludge Storage Tank No.2 & No.3 - Coarse Bubble Mixing & O2 System
Diffuser Orifice Min. Headloss Required
SYSTEM CURVE HEADLOSS OUTPUT
PIPING DATA
FLOW DATA
EQUIVALENT LENGTHS
SYSTEM HEADLOSS THROUGH DISTRIBUTION PIPE SECTION
A Division of Red Valve Company, Inc. Page 8 of 10
Specific Weight of Air 0.0669 lb/ft^3 Beginning Flowrate 550.00 cfm Density of Air 0.00208 slug/ft^3 Ending Flowrate 650.00 cfm Air Temp in pipe 140.00 deg. F Flowrate Increments 5.00 cfm
20 Total Values Maximum 20.00
Absolute Roughness 1.50E-04 E Linear Length of Discharge 50.00 feet Relative Roughness 3.000E-04 E/D Equivalent Length of Fittings 35.00 feet Discharge Line Nominal Diameter 6.00 inches Equivalent Length of Discharge 85.00 feet Actual Inside Diameter (Disch.) 6.357 inches
Airflow Pipe I.D. Velocity Headloss Headloss Nominal Recommended cfm inches fpm psi inch - H20 Pipe Diameter Max. Velocity
550.00 6.357 2494.9 0.041 1.14 inches fpm
555.00 6.357 2517.6 0.042 1.16
560.00 6.357 2540.2 0.042 1.18 2.00 2790
565.00 6.357 2562.9 0.043 1.20 3.00 3025
570.00 6.357 2585.6 0.044 1.22 4.00 3400
575.00 6.357 2608.3 0.045 1.24 6.00 3495
580.00 6.357 2631.0 0.045 1.26 8.00 3750
585.00 6.357 2653.6 0.046 1.28 10.00 3970
590.00 6.357 2676.3 0.047 1.30 12.00 4200
595.00 6.357 2699.0 0.047 1.32 14.00 4450
600.00 6.357 2721.7 0.048 1.34 16.00 4695
605.00 6.357 2744.4 0.049 1.36 18.00 4950
610.00 6.357 2767.0 0.050 1.38 20.00 5175
615.00 6.357 2789.7 0.051 1.40 22.00 5410
620.00 6.357 2812.4 0.051 1.42 24.00 5970
625.00 6.357 2835.1 0.052 1.45
630.00 6.357 2857.8 0.053 1.47
635.00 6.357 2880.4 0.054 1.49
640.00 6.357 2903.1 0.054 1.51
645.00 6.357 2925.8 0.055 1.53 2.33 inches
650.00 6.357 2948.5 0.056 1.56
Diffuser Orifice Min. Headloss Required
PIPING DATA EQUIVALENT LENGTHS
SYSTEM CURVE HEADLOSS OUTPUT
Cincinnati / Northern Kentucky International Airport Sludge Storage Tank No.2 & No.3 - Coarse Bubble Mixing & O2 System
SYSTEM HEADLOSS THROUGH DISTRIBUTION PIPE SECTION
AIR DATA FLOW DATA
A Division of Red Valve Company, Inc. Page 9 of 10
Total Airflow Required for the Process = 7,600.0 cfm 12,914 m3/hr Number of Operating Blowers = 2.0
Airflow per Blower = 3,800.0 cfm 6,457 m3/hr Mass Rate = 285.83 lbs/min
Barometric Pressure at Site = 14.26 psia 0.984 Bar Inlet Blower Air Temperature at the Site = 100 F 37.74 C
Saturated Vapor Pressure at Site Temperature = 0.9503 psia 6.552 kPa Relative Humidity at the Site = 50%
Applied Blower Efficiency = 55% Pressure at Standard Conditions = 14.70 psia 101.354 kPa
Temperature at Standard Conditions = 68 F 19.98 C Saturated Vapor Pressure at Standard Temperature = 0.3391 psia 2.338 kPa
Relative Humidity at Standard Conditions = 36% Density of Air at Standard Conditions = 0.075 lbs/ft^3 1.201 kg/m3
Headloss - Hydrostatic = 176.40 in. 4.481 m Headloss - Drop Pipe Section = 1.21 in. 0.031 m
Headloss - Longest Manifold Piping Section = 3.76 in. 0.095 m Diffuser Orifice Diam. = 0.5000 in. 12.700 mm
Headloss - Diffuser Orifice = 5.00 in. 0.127 m Headloss - Diffuser Body = 4.00 in. 0.102 m
Total Headloss = 195.87 in. 4.975 m
Absolute Pressure at Top of Drop Leg = 21.31 psia 146.953 kPa 1.470 Bar Gauge Pressure at Top of Drop Leg = 7.05 psig 48.616 kPa 0.486 Bar
R = 1.4797 Discharge Air Temperature = 222.6 F 105.8 C
Blower Airflow at Site Conditions = 4,261.4 acfm 7,241 am3/hr Blower Brake HP = 209.0 HP 155.8 kW
Number of Operating Blowers = 2.0 Airflow per Blower = 4,261 acfm 7,241 Am3/hr
Discharge Pressure* = 7.05 psig 48.616 kPa Blower Brake HP = 209.0 HP 155.8 kW
Applied Blower Efficiency = 55%
ICFM = SCFM on Manufacturer's Blower Curves
CFM = Airflow required for the process
ACFM = Adjusted Airflow for site conditions
ICFM = ACFM +additional losses thru blower and field piping
Cincinnati / Northern Kentucky International Airport Sludge Storage Tank No.2 & No.3 - Coarse Bubble Mixing & O2 System
BLOWER REQUIREMENTS - CONVERSION FOR SITE AIR DENSITY, HUMIDITY & TEMPERATURE
COARSE BUBBLE DIFFUSER SYSTEM
DESIGN FOR MIXING & O2
*Note: Headloss associated to top side, field routed air supply piping, valves and blower fittings must be added to determine total system operating pressure and ICFM rate at blower.
The calculations shown on this page are for the purpose of estimating the diffuser system operating head at the top of the drop pipe and also estimating the airflow requirement after adjusting for site elevation, relative humidity, inlet air temperature, and estimated blower operating efficiency. Actual blower performance may differ after the specific blower efficency is applied along with additional head requirements associated to the blower unit, inter-connecting piping and inline valves.
Blower Performance
Requirements
6/27/2025
A Division of Red Valve Company, Inc. Page 10 of 10
File details come from the government source that posted it. Updated .