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

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