How to build a successful liquid ring vacuum truck

Step 1

Understanding the working principles

Getting an understanding of the working principle of the liquid ring pump points out the benefits and advantages. No mechanical contact, no polluting exhaust, no vibrations, no noise – just vacuum.

The working principle of the liquid ring pump is based on the rotary motion of the rotor, which creates a liquid ring. This liquid ring provides sealing between the suction and the discharge side of the pump, thus allowing the pump to function without any mechanical contact.

Additionally, the liquid ring also acts as a cushion which absorbs the energy from the rotary motion, resulting in no vibrations, no noise, and no polluting exhaust.

Step 2

Rightsizing

Dimensioning the vacuum system for a vehicle is essential for its performance in operation and as an investment.

At Samson Pumps we guide our customers with a full Solution Finder report based on your requirements and our recommendations for air speed, water volume and cooling.

Explore how we can help you rightsize your vacuum system.

Step 3

Placing the pump

There are not many requirements for placing a liquid ring pump, but one rule-of-thumb, is to place the pump as low as possible.

A low placed pump opens more options for placing the water tank and enables the water to flow to the pump by gravity.

Step 4

Power requirements

Check the power requirements in your Solution Finder report and make sure that the vehicle provides the required kW, HP and torque.

Decide whether the pump should be run by belt or hydraulics.

If you are planning to run the pump by hydraulics, you can order a ready to run package from Samson Pumps.

Step 5

Direction of rotation

The correct direction of rotation is important, especially for belt driven installations.

Please use this illustration to identify whether the pump should be run counterclockwise or clockwise.

CCW = Counterclockwise
CW = Clockwise

Step 6

Placing the non-return valve

It’s important to install a non-return valve on the pressure side of the pump.

In a situation where the slurry tank is evacuated and the liquid ring pump stops rotation, the non-return valve will prevent the vacuum from the slurry tank to empty the water tank.

Step 7

Separating the water

Separating the water from the exhaust air can be done inside the water tank or in an isolated separator.

In this illustration you can find the basic dimensions to follow.

At Samson Pumps it’s our goal to develop separators that separate water and air 100% and leave no drop behind.

Step 8

Placing the water tank

For a liquid ring pump installation, its very important to place the water tank above the pump, so the water can flow to the pump by gravity.

Step 9

4way valve

A 4-way valve is used to change from suction to pressure enabling the operator to empty the vacuum tank.

The 4-way valve can be delivered as manual operated by a handle, or automatically by an actuator and limit switch.

The automatic version will be operated by air pressure and controlled by the signals from the main operating system.

Step 10

Connecting the fan cooler

If a fan cooler is required, make sure to install it safely and protected.

The fan cooler will remove heat output from the construction and stablize the operationg temparature at a lower level.