When Is a Rigid Coupling Used for Pumps?

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When is a rigid coupling used for pumps?

A rigid coupling, as the name implies, lacks flexibility, allowing no misalignment between shafts; therefore, their installation is based on tight dimensional requirements and fits. The rigid coupling connects the driver and driven shafts, transmits torque, transmits axial and radial loads and provides a breakpoint for maintenance.

The transmission of axial and radial loads is a key differentiating factor between rigid and flexible couplings. The transmission of these loads allows the driver bearings to carry axial loads and the pump to not require a thrust bearing. Additionally, rigid couplings may be used in applications that have higher torque and speed requirements. Rigid couplings can be used for both horizontal and vertical pumps; however, they are primarily used in vertical pumping applications where it is common for the vertical motor bearing to include the thrust bearing.

For more information on couplings, refer to HI’s newest Guidebook Coupling Selection, Installation, and Maintenance for the Pumping Industry.

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Read more HI Pump FAQs here.

Couplings transmit torque in drive systems. But they are able to do more. These are the three essential functions of a coupling.

1. Transmitting torque
   Power and speed result in torque. Only with the transmission of torque a machine can be operated.
2. Compensating misalignment
   “If a coupling is not installed in the ideal physically straight manner, it must be capable of compensating misalignments between the driving and driven element”, states Reinhardt Hackenschmidt, Academic Head for Engineering Design and CAD at the University of Bayreuth. “This may involve parallel, axial as well as angular misalignments.”
3. Providing smooth operations
   “With a coupling I can tune a system in a highly dynamical way, provide for operational smoothness and for shock absorption“, explains Norbert Telaar, Head of Strategic Product Management at RINGFEDER POWER TRANSMISSION. “A coupling should be able to handle all this.”

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