Calculator App
For nearly 100 years, Hosokawa has provided manufacturers with some of the most efficient and dependable powder processing systems. Our massive team of mechanical, chemical and electrical engineers have extensive process experience and knowledge. The Hosokawa Calculator was developed for our customers so they can quickly and accurately make critical calculations vital to system performance and process optimization.
This application includes:
- SCFM to ACFM Conventor
- Tip Speed Calculator
- Nozzle Flow Calculator
- Belt Drive Sizing
- Rotary Airlock Sizing
- Double Flap Valve Spool Sizing
- Mill Outlet Temperature
- Micron to Mesh Conventor
Inputs
Item
- Standard Air Flow
- Static Pressure
- Temperature
- Elevation
- Duct Inner Diameter
- Expected Rate
- d50 Particle Size
- Material Density
Value
- Standard Air Flow
- Static Pressure
- Temperature
- Elevation
- Duct Inner Diameter
- d50 Particle Size
- Material Density
Units
- %
- SCFM
- %
- Inches of Water
- %
- Deg F
- %
- Ft
- %
- Inches
- %
- %
- Micron
- %
- Lb/Ft3
Results
Items Calculated
- Actual Air Flow
- Rot Speed of Rotor
- Duct Flow Velocity
- Rot Speed of Rotor
- Tip Speed of Rotor
- Terminal Velocity
Value
- Actual Air Flow
- Duct Flow Velocity
- Terminal Velocity
Units
- %
- ACFM
- M3/Hr
- %
- Ft/Min
- M/S
- RPM
- %
- M/S

SCFM refers to “standard cubic feet per minute” or the given flow rate of air at standard room temperature and pressure. Standard air flow is the baseline required flow; depending on your operating conditions (i.e. differing pressure and temperature) this tool allows you to convert the required SCFM, to the actual flow or ACFM that you will read from your instruments.
Inputs
Item
- Rotor Diameter
- Rotor Speed
- Rotor Speed
Value
- Rotor Diameter
- Rotor Speed
Units
- %
- Inches
- %
- RPM

Otherwise known as peripheral velocity, this calculator determines the velocity of the impact surface of a hammer at the outer edge of a rotor disk. Tip speed is important because the hammer velocity directly affects how much force is applied to particles being milled. Faster tip speeds general produce smaller particles and can increase material throughput.
Inputs
Item
- Grind Air Pressure
- Nozzle Diameter
- Grind Air Temperature
- Number of Nozzles
Value
- Grind Air Pressure
- Nozzle Diameter
- Grind Air Temperature
- Number of Nozzles
Units
- %
- BARg
- %
- MM
- %
- Deg F
- %
- -

Used to calculate the amount of air that will pass through the nozzle(s) of a jet mill in SCFM for compressor sizing. Calculating require SCFM for a jet mill is critical to performance. With insufficient air flow, the jet mill cannot achieve optimal results and conversely too much air flow is wasteful and costly to maintain.
Inputs
Item
- Driver Pulley OD
- Driven Pulley OD
- Belt Length
- Feed Rate
- Driver Shaft Speed
- Feed Rate
- Driver Face Width
- Driven Face Width
Value
- Driver Pulley OD
- Driven Pulley OD
- Belt Length
- Driver Shaft Speed
- Driver Face Width
- Driven Face Width
Units
- %
- Inches
- %
- Inches
- %
- Inches
- Feed Rate
- %
- RPM
- Feed Rate
- %
- Inches
- %
- Inches
Results
Items Calculated
- Center Distance
- Rot Speed of Rotor
- Driven Shaft Speed
- RIM Speed
- Rot Speed of Rotor
- Driver Dyn Bal Req´d?
- Driven Dyn Bal Req´d?
Value
- Center Distance
- Driven Shaft Speed
- RIM Speed
- Driver Dyn Bal Req´d?
- Driven Dyn Bal Req´d?
Units
- %
- Inches
- Inches
- %
- RPM
- %
- Ft/Min
- Inches
- %
- Y/N
- %
- Y/N
*Error, center distance is impossible for selected belt length and/or sheave combination
Inputs
Item
- Feed Rate
- Material Density
- Expected Rate
- Rotor Diameter
- Capacity of Rotor
Value
- Feed Rate
- Material Density
- Expected Rate
- Rotor Diameter
- Capacity of Rotor
Units
- %
- Lb/Hr
- %
- Lb/ft3
- %
- %
- %
- Inches
- %
- Ft3/Rev
Results
Items Calculated
- Vol. Feed Rate
- Rot Speed of Rotor
- Tip Speed of Rotor
Value
- Vol. Feed Rate
- Rot Speed of Rotor
- Tip Speed of Rotor
Units
- %
- Ft3/Hr
- %
- RPM
- %
- M/S
Inputs
Item
- Mass Flow
- Material Density
- DFV Spool Diameter
- # of Cycles per Minute
- Fill Factor
Value
- Mass Flow
- Material Density
- DFV Spool Diameter
- # of Cycles per Minute
- Fill Factor
Units
- %
- Lb/Hr
- %
- Lb/ft3
- %
- Inches
- %
- 1/Min
- %
- %
Results
Items Calculated
- Vol Rate
- Min Spool Length
- Mass Flow per Cycle
Value
- Vol Rate
- Min Spool Length
- Mass Flow per Cycle
Units
- %
- Ft3/Hr
- %
- Inches
- %
- Lb

A double flap valve is a simple air-lock, the two valves open and close at alternating intervals allowing material to first fill the spool, seal the process area, and then open the other valve to evacuate material out of the bottom. This calculator helps to determine the spool length required for a double flap valve setup given the flap valve sizes and required mass flow rate.
Inputs
Item
- Feed Rate
- Feed Moisture %
- Expected Rate
- Mill Power Rating
- Specific Heat of Process
- Materials
- Feed Material Inlet Temp
- Mill Inlet Air Flow Rate
- Mill Inlet Air Temp
Value
- Feed Rate
- Feed Moisture %
- Mill Power Rating
- Specific Heat of Process
- Materials
- Feed Material Inlet Temp
- Mill Inlet Air Flow Rate
- Mill Inlet Air Temp
Units
- %
- Lb/Hr
- %
- %
- %
- %
- HP
- %
- %
- BTU/Lb-Deg F
- Lb/Hr
- %
- Deg F
- %
- SCFM
- %
- Deg F
Results
Items Calculated
- Product Moisture Rate
- Mill Inlet Air Density
- Tip Speed of Rotor
- Mill Outlet Air Temp
Value
- Product Moisture Rate
- Mill Inlet Air Density
- Mill Outlet Air Temp
Units
- %
- Lb/Hr
- %
- Lb/ft3
- M/S
- %
- Deg F
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Disclaimer & Warning: The Hosokawa Calculator is provided for information purposes only and should not be used to design, alter or plan any process calculations without consulting a qualified engineer. Hosokawa reserves the right to edit, alter and remove this calculator at any time without cause. Hosokawa provides no guarantees from this application. The applications may have unknown errors and omissions that can greatly impact results. Use this information at your own risk. Contact Hosokawa Micron Powder Systems for additional disclosures and details.