It may sound like something you’ve never heard before, but in any company that has industrial use of pumps and working machinery, will have one of the types of pumps including the liquid-ring pump. This is a displacement pump that positively rotates via the use of liquids, usually water. Used normally as a vacuum pump, they can also be used as a compressor for gas in various industries because the functionality of one is like a vane pump. In these types, the rotor is usually the only moving part. Find out more by clicking here.
If you’re in the market to purchase a few for your company, look no further than the information provided in this article below. We will take apart three of the popular types so you know which one will fit best in your company and what they are good for. There are three main types of pumps, which we will include in this discussion below
How this work is in two stages, first a multi-blade impeller is placed in a container with liquid, when the shaft container that the liquid is in turns, it creates a centrifugal force, which holds the ring to the inside walls, the blades enter the liquids as the impeller rotates, which creates cell volume, that eventually creates a vacuum.
Two Common Types of Single and Multistage Pumps
1. The Single-stage vacuum pump
The single and multi-stage pumps usually have two compression stages on one common shaft, but sometimes the multi-stage one will have as many as two. In these types, however, the pressure attainable in the reduction is limited by a vapor sent from a ring-liquid. This increasing amount of pressure diminishes once the remaining vacuum hits capacity. Sometimes the efficiency is also compromised.
2. Recirculation of Ring-Liquid
When you have a discharge stream, where some of the ring-liquid is discharged, it helps to separate gas from steam by using other equipment that is external to the pump itself. in this recirculation of ring-liquid, the discharge has circulated the system, and contaminants from the gas, get trapped in the ring-liquid. Read more about the process here: https://www.vooner.com/liquid-ring-vacuum-pumps/. If the systems configurations are set as such.
As the liquid continues to circulate, the contaminants from the gas become concentrated and can cause damage and cut the life-span of the pumps. However, a filtration system can avoid this from happening and will ensure the contaminants are kept to an acceptable level.
When not in circulation, such as the non-recirculating systems, any hot liquids that are discharged, such as water, is treated as waste. Due to the environmental impact of these machines, they have started to become very rare. They do however have a variety of applications in many industries.
Uses for The Liquid Ring Vacuum Pumps
There have been various uses of these types of pumps, from paper manufacturing industries to oil and gas. We take a look at a few of the common ones below.
Used in maintaining various condenser vacuums, they are large steam-turbine generators, which are set by removing the none-condensable gases, typically used where the level is between 30–50 mbar.
Many paper manufacturing factories use these pumps as well. This is because they are reliable and energy-efficient. To remove the water from the pulp slurry and used in extracting water from the press felts. This is also like those manufacturers who form a mold from pulp products such as egg cartons and various packaging.
Due to the suction capabilities being in direct proportion to the power absorbed, it will either increase or decrease, as such, if the rotating speeds are reduced the power absorbed is also reduced, by up to 50%. This is no new concept it has been practiced back in the 90s, where manufacturers took advantage of leverage.
On construction sites, this is a common practice, which includes soil remediation, a highly important task and something that a lot of countries government regulations entail to be done at any site of current construction, or one that has been constructed years ago but has not yet been checked for pollutants or environmentally harmful components.
The method of soil remediation entails the process of getting rid of contaminated and polluted soil, surface and groundwater, and any forms of contamination left on sites, which reduces its impact on the environment as well as the people living around it. The groundwater is sucked up through a vacuum from a well.
Another type of industry that this process is used is within the oil or petroleum refining one, where vacuum distillation makes use of the ring-liquid pumps to assist with the process vacuum and vapor recovery.
Types of Liquids Used in These Pumps
These liquid types of pumps can use any type of liquid but need to have the correct vapor pressure properties. The most common one is water and is used as a sealant liquid. However, oil is also used due to its very low vapor pressure capabilities. The third option of sulfuric-acid is also available in some processes that require dry chlorine gas.
The fact that most any liquids can be used in the ring-liquids, is ideal for industries that deal with solvent or vapor recovery processes. Elements such as distillation for instance, or those that generate toluene vapors, can benefit from these because to use toluene as a sealant, with cool water, keeps the liquids low enough to pull the required vacuum or if ionic liquids are used, they can lower the pressure to below 1mbar.
All in all, these can be some of the most efficient pieces of equipment to use in many bulk productions and can save both, time, and costs, as well as keep things efficient in the production lines. When needing maintenance, the performance of the pumps needs to be checked regularly especially if their warranty period has expired. This is usually done by using an endoscopy and capacity test that collects and measures data to analyze the functionality of them and to optimize where need be.