Things to Consider for Safe and Proper Set up of the Liquid Ring Vacuum Pumps

Liquid ring pumps are the most commonly used vacuum producing devices employed in industrial applications. These work on liquid ring principle and consist of shaft and impellers as the primary devices responsible for working of it. One of the most important requirements to make a liquid ring work is the service liquid. A clean, non-abrasive and solid-free service liquid ensures the best performance from the liquid ring equipment. The liquid can be either be oil or water and for this reason depending on the type of liquid used in the pump to create a seal, they are usually classified into categories like oil seal and water ring vacuum pumps. As the impeller rotates, the service liquid is also rotated forming a ring. The liquid ring is formed because of the relative eccentricity between the pump casing and the rotating impeller. Every revolution of the rotating impeller will result in filling and partial emptying of each rotor chamber thereby creating a piston action within each set of rotor of impeller blades. The spaces are formed between the impeller blades which will trap the air between the blades. The compressed air in space pockets will be then forced out as the impeller blades reach the discharge point.

Proper installation or setting up of it is necessary for its efficient operation. Initially while installing the vacuum pumps there are a few steps which should be followed to ensure a safe implementation of it.

  • It should be unpacked carefully to avoid damages.
  • It is always a good procedure to lift the pumping unit mounted on a base plate from its base itself.
  • Do not use any hooks or slings for mounting it as this can cause misalignment it and therefore are not recommended to be used.
  • Its components are stored with a liquid preservative. This liquid should be drained off from the unit before its installation.

For installation, pumps should be mounted either on concrete pads or skids initially. All the joints in the piping of the pumping system should be checked for leaks before set up. Pumps that are directly coupled to motors should be test run in the workplace prior to the start-up. Checking the coupling alignment it before installation is necessary because generally during shipment some unforeseen forces or moments get imposed on the equipment. With the guidelines of the coupling manufacturer, proper coupling alignment can be assured for the best set up of the vacuum pump. In the v-belt driven, the v-belts should be placed above the sheaves and in grooves. The v-belts should be placed in such a way that they are inside and not forced over the sides of the grooves. When all the belts are placed in the grooves, the centers are adjusted to take all the slack such that the slack side is slightly bowed during the operation it. The belts should be re-tensioned whenever necessary after a few days of operation of this eqipment in order to ensure maximum performance from the pump.


Hence by following the above steps a safe and proper installation of liquid ring vacuum pumps can be ensured for maximum performance at the industries. PPI Pumps Pvt Ltd is a leading vacuum pump manufacturing company offering high quality and affordable pumping solutions like single cone, two stage, twin lobe roots blower and chemical process pumps.

This article educates reader about liquid ring equipment and steps for their careful installation.

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