PURPOSE: To provide a support structure of a rotatable housing of a liquid ring pump, which facilitates maintenance without stopping or substantially disassembling the pump.

CONSTITUTION: A support structure of a rotatable housing of a liquid ring pump includes a stationary support structure 20 disposed circumferentially around the housing 10, and a plurality of rollers 30 rotatably and removably mounted on this stationary support structure 20. The rollers 30 support the housing 10 for rotation, and they are distributed axially along and circumferentially about the housing 10 so that any one of the rollers 30 can be removed (e.g. for repair or replacement) without disturbing operation of the pump.