Couplings
Couplings transmit torque between driver and pump while accommodating small misalignment. Correct coupling selection affects vibration, bearing life, maintainability and reliability.
These couplings use elastomeric or flexible elements to absorb misalignment and damp vibrations. They are common in general industrial pump applications.
Disc or lamella couplings use metallic flexible discs. They are torsionally stiff, suitable for higher speeds and often used in more demanding applications.
Gear couplings can transmit high torque but require lubrication and maintenance. They are less common for many modern pump packages compared with disc couplings.
Typical manufacturers seen in pump and rotating equipment applications include Flender, John Crane, KTR, R+W, Rexnord and others depending on project region and specification.
For process pumps, spacer couplings are often preferred because they allow mechanical seal removal without moving the driver or disturbing alignment.