Possible Reasons/Scenarios in Which to Use Pumps in Series:
- When a wide range of flow is required
- When the pumps discharge into a common manifold
- When the system head requirement is greater than can be supplied by one pump
- When system pressure requirements vary
Keys to using pumps in series:
- Same flows, heads are additive
- Not limited to identical pumps
- Continuously rising curves are best
- Check literally everything (seal limits, pump pressure limits, etc.)
Possible Advantages:
- Maintain high pump efficiency with greatly varying heads
- May be able to use some present equipment
- Space pumps throughout system
- Reduces pipe pressures
- Reduces axial load
Possible Disadvantages:
- Multiple pumps may be more expensive
- Larger pumps may offer higher efficiency at design point
- More accessory equipment required
