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Engineering Calculations

Torque and horsepower relations:

T = HP x 5252 ÷ RPM
HP = T x RPM ÷ 5252
RPM = HP x 5252 ÷ T
Torque values are in foot pounds.

Horsepower for driving a pump:

For every 1 HP of drive, the equivalent of 1 GPM @ 1500 PSI can be produced.

Hydraulic (fluid power) horsepower:

HP = PSI x GPM ÷ 1714
PSI is gauge pressure in pounds per square inch,
GPM is oil flow in gallons per minute.

Horsepower for idling a pump:

To idle a pump when it is unloaded will require about 5% of its full rated horsepower.

Velocity of oil flow in pipe:

V = GPM x 0.3208 ÷ A
V is oil velocity in feet per
second. GPM is flow in gallons
per minute, A is inside area of
pipe in square inches.

Compressibility of hydraulic oil:

Volume reduction is approximately 1/2% for every 1000 PSI of fluid pressure.

Charles' Law for behavior of gases:
T1 V2 = T2 V1, or T1 P2 = T2 P1
T1, P1. and V1 are initial temperature, pressure, and volume, and T2, P2, and V2 are final

 

Compressibility of water:

Volume reduction is about 1/3% for every 1000 PSI pressure.

Boyle's Law for behavior of gases:
P1 V1 = P2 V2
P1 and V1 are initial pressure and volume; P2 and V2 are final conditions.

 

Wattage for heating hydraulic oil:

Each watt will raise the temperature of 1 gallon of oil by 10F per hour.

Hydraulic cyl. piston travel speed:
S = CIM ÷ A
S is piston travel speed, inches per minute, CIM is oil flow into cylinder, cubic inches per minute, A is piston area in square inches.

Flow velocity in hydraulic lines:

Pump suction lines 2 to 4 feet per second; pressure lines up to sure to 500 PSI, 10 to 15 feet/sec.; Pressure lines 500 to 3000 PSI, 15 to 20 feet/sec.; pressure lines over 3000 PSI, 25 ft/sec; all oil lines in air-over-oil system, 4 ft/sec.

Heat equivalent of fluid power:
BTU per hour = PSI x GPM ÷ 2

Thrust or force of any cylinder:

T = A x PSI
T is thrust or force, in pounds, A is piston net area in square inches, PSI is gauge pressure.


 

Industry References

Industry References

Download Prochure: Explosion Proof Motor Classifications ATEX IEC

Download Prochure: Explosion Proof Motor Classifications NEMA

Download Prochure: NEMA and IP Ratings 1

Download Prochure: NEMA and IP Ratings 2

Powerfully Smart Solutions

Flow Products, Inc. has over 60 years as a leading hydraulics, pneumatics and electro-mechanical systems expert. We have become a key component in the success of our customers. This valued position is enhanced by the major industry manufacturers we partner with.
Focusing on our customer’s business needs.

 


Fluid Conveyance

Fluid Conveyance

• Bulk Hose & Fittings
• Adapters & Protective Sleeves
• Pipe Clamping Systems
• Flow Meters
• Sight & Level Gauges
• Rotary Manifolds
• Quick Disconnects
• Custom Hose Assemblies

Hydraulics Pneumatics

Hydraulics & Pneumatics

• Servo Systems
• Pumps: Gear, Vane, Piston, Hydrostatic
• Valves: Directional, Flow, Pressure Control
• Solenoid, Manual & Piloted
• Cylinders: Rodless, Mobile, Industrial, ISO, NFPA
• Materials: Aluminum, Steel, Stainless Steel
• Motors: Hydraulic, Pneumatic
• Filtration & Vacuum Systems
• Rotary Actuators

Power Transmission

Power Transmission

• Brakes, Clutches
• Right Angle Gear Drives & Motors
• Parallel Gear Drives
• Planetary Gearboxes
• Swing Drives
• Slew Bearings
• Wheel Drive
Electrical Controls

Electrical & Controls

• Electro-mechanical Actuators
• Control Panels
• Temperature, Pressure & Flow Transmitters
• Temperature & Pressure Sensors
• Motors: AC, DC, Stepper, Servo
• Automation Cabling, Power Supplies
• Variable Frequency Drives
Custom Engineered Solutions

Custom Engineered Solutions

• Power Units: Mobile & Industrial
• Tube Bend Fabrication – max. 2.5” OD tube
• Integrated Circuit Manifold Assemblies
• Hose Assemblies (Hydraulic, Industrial, Metal Flexible)
• TEFLON Hose with Stainless Steel Braid
• Pneumatic Valve Manifolds & Panels