Calculators
Stroke Rate
Calculate pumping unit stroke rates from sheave configuration
The Stroke Rate calculator determines strokes per minute (SPM) based on motor speed, gear ratio, and sheave diameters. It also calculates required belt length.
Inputs
| Field | Description |
|---|---|
| Prime Mover RPM | Motor/engine speed |
| Gear Reducer Ratio | Gearbox reduction ratio |
| Prime Mover Sheave Diameter (in) | Motor sheave size |
| Gear Reducer Sheave Diameter (in) | Gearbox input sheave size |
| Center Distance Of Shafts (in) | Distance between motor and gearbox shafts |
Outputs
Summary
| Output | Description |
|---|---|
| SPM | Calculated strokes per minute |
| Belt Length | Required V-belt length (inches) |
SPM Table
Shows SPM at various prime mover RPM values, from 0 to 2000+ RPM, allowing quick lookup of operating speeds.
Stroke Rate Chart
Visual graph showing SPM vs. Prime Mover RPM relationship.
Use Cases
- Determine SPM for a given sheave combination
- Select sheave sizes for target SPM
- Calculate belt length for ordering
- Evaluate RPM impact on pumping speed