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Justification of VFD

The document compares jockey pumps and Variable Frequency Drives (VFDs) in fire pump systems, highlighting that jockey pumps maintain pressure while VFDs adjust the main pump's speed for pressure control. VFDs offer benefits such as energy efficiency and system simplification by potentially eliminating the need for a separate jockey pump. Overall, VFDs can optimize fire pump operation and reduce energy consumption.

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MAP GTCL
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38 views2 pages

Justification of VFD

The document compares jockey pumps and Variable Frequency Drives (VFDs) in fire pump systems, highlighting that jockey pumps maintain pressure while VFDs adjust the main pump's speed for pressure control. VFDs offer benefits such as energy efficiency and system simplification by potentially eliminating the need for a separate jockey pump. Overall, VFDs can optimize fire pump operation and reduce energy consumption.

Uploaded by

MAP GTCL
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Justification VFD over Jockey Pump

In a fire pump system, a "jockey pump" is a small pump that constantly maintains water pressure
within the system by running at a low flow rate, while a "VFD" (Variable Frequency Drive) is a
device that controls the speed of the main fire pump motor, allowing it to adjust its water flow
based on pressure needs, essentially eliminating the need for a separate jockey pump in some
situations; the key difference is that a jockey pump is a dedicated small pump for pressure
maintenance, while a VFD regulates the speed of the larger fire pump to achieve pressure
control.
 Key points about Jockey Pumps:
 Function: Primarily used to maintain system pressure by compensating for small leaks in
the sprinkler system, preventing unnecessary cycling of the main fire pump.
 Size: Smaller and less powerful than a fire pump.
 Operation: Runs continuously at a low flow rate, monitored by pressure switches to
activate when pressure drops below a set point.

 Key points about VFDs:


 Function:
Controls the speed of the fire pump motor by adjusting the electrical frequency,
allowing for variable water flow based on pressure demands.
 Benefit:
Can eliminate the need for a separate jockey pump by dynamically adjusting the
fire pump speed to maintain pressure.
 Application:
Can be used with larger fire pumps to optimize their operation and reduce energy
consumption.

Benefit of using a VFD instead of a jockey pump:


• Energy Efficiency:
VFDs can significantly reduce energy consumption by only running the fire pump at the required
speed, making it a more energy-efficient option.
• System Simplification:
In some cases, a VFD can eliminate the need for a separate jockey pump, reducing system
complexity and potential failure points.

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