How Liquid Ring Vacuum Pumps Work

How Liquid Ring Vacuum Pumps Work
Liquid ring vacuum pumps are rotating positive displacement machines providing process vacuum in industrial applications such as chemical, electrical power, environmental, food & beverage processing and packaging, marine, mining, oil & gas, pharmaceutical, pulp & paper, and textiles. Liquid ring vacuum pumps utilize water or other processes compatible liquid as the sealant. The simple operation, with no contacting parts, make liquid ring vacuum pumps a safe and reliable choice for handling dirty and potentially dangerous gas streams. Liquid ring pumps are available in single and dual stage designs and also configured as compressors for even more versatility.

Principle Of Operation
The seal liquid forms the ring inside a pump body as the impeller spins creating small chambers for gas to be trapped. The axis of the rotor is eccentric from the body allowing the liquid to almost fill, and then almost empty each rotor chamber during a single revolution, forming the compression of the gas for the pumping action. Vacuum inlet and atmospheric discharge ports provide flow paths for the gas mixture being handled. The heat of compression of the gas is dissipated into the seal liquid, and some of the liquid flows out to discharge. The exhaust gas and residual water discharge is separated from the gas stream and directed to the house exhaust and returned to the pump respectively. Seal fluid is replaced by a constant flow of cooler seal fluid.

Watch This Video To Learn “How It Works”

Characteristics Of Liquid Ring Vacuum Pumps
Accepts Carryover – Soft solids, moisture, slugs, chemicals and more will not harm the pump. These impurities will simply be washed out through the pump discharge.
Cool & Quiet Operation – The pump runs cool owing to the circulation of the sealing water inside the pump. The operation is relatively quiet – not exceeding 85 dBA.
Constant Operation For Any Vacuum Level – Pump can operate constantly and continuously at any vacuum level – from 29 in. Hg to atmospheric pressure.

Liquid Ring Technology How it Works
Easy Maintenance & Longer Pump Life – Liquid ring vacuum pumps are robust in construction and have only one moving part, the rotor, which is mounted on a shaft supported by a set of bearings designed for a long service life of continuous operation. This benefits the user with less wear and simpler, affordable maintenance.
Environmental – Pumps do not require an oil change, filter, oil-pans, condenser or etc. For that reason, plant rooms run clean, free of oil contamination and oil discharges to sewers.
A Look Inside A Liquid Ring Vacuum Pump
Flat Sided Liquid Ring Vacuum Pump
Conical Liquid Ring Vacuum Pump
The Technology Behind Liquid Ring Vacuum Pumps
The design technology behind liquid ring vacuum pumps is advanced to achieve optimum, reliable performance for the rigorous demands of harsh industrial environments. Liquid ring vacuum pumps are an economical and robust solution engineered to meet specific customer requirements.

Condensation Of Vapors Can Yield A Capacity Bonus
Dry air or a dry gas mixture is compressed from vacuum to atmospheric pressure in a liquid ring pump much the same way as it would be in any other displacement type pump, except that there is less of a temperature rise of the gas stream through the pump.

Humid air or gas mixtures containing condensable vapor behave quite differently. Some of the vapor that enters a liquid ring pump condenses when it is cooled by the lower temperature seal liquid. The condensate mixes with the seal liquid. Now, it occupies a much-reduced space as contrasted with its former volumetric dimension when it was a component of the inlet gas stream. This volumetric reduction becomes a capacity bonus.

The only vapor that can be condensed early enough to escape compression contributes to the inlet capacity bonus. In each rotor chamber, the condensation must occur before that chamber passes its inlet port. Any condensation that occurs after the cutoff will not have an effect on pump inlet capacity.

Liquid ring vacuum pumps can handle large amounts of liquid through its inlet port with a negligible reduction of gas capacity. To maximize the condensation bonus some of the liquid is often sprayed into the inlet piping, upstream of the vacuum pump itself.

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Backed by over 110 years of experience, NASH CERTIFIED experts provide aftermarket support with maintenance, service, parts, and repair. Service centers are globally located to protect your vacuum system investment and provide quality, reliable, and efficient solutions.

Relat

ntroduction to a Liquid Ring Vacuum Pump

Introduction to a Liquid Ring Vacuum Pump

Picture1Usually, a liquid ring vacuum pump is used as a rotating positive displacement vacuum pump but it can also be used as a gas compressor compressing gases to pressures above the atmospheric. As far as function, liquid ring pumps have similarities with a rotary vane pump but differences are crucial for achieving highest reliabilities and trouble-free operation. For instance, a liquid ring vacuum pump is designed with the rotor as being the only moving component. There are no metal-to-metal contact within the pump, no valves, no sliding vanes, no need for lubrication (other than outboard mounted bearings). The water provides the sealing while acting as the compressing media within the pumping chamber. Compression is isothermal with very little temperature rise during compression, low noise without silencers, low vibration, cool and safe operation.

How a Liquid Ring Vacuum Pump Works

Using some form of liquid (usual water), which is also referred to as sealant, compression is achieved as soon as pump is started and vacuum is created. Before the pump is started, there needs to be some liquid sealant inside, some of the sealant is discharged with the gas being pumped, the same amount of liquid must be replenished or sent back to the pump after it has Picture3been cooled. Based on the exact application, sealant can be water, solvent, oil or other liquids. Once the pump has been started, the sealant is slung by the impeller using centrifugal force to the outer walls of the body. With this, a ring of liquid is formed.

As mentioned, the impeller is eccentrically mounted within the pumping cylindrical casing, because of this some blades are almost out of the liquid ring while others are completely submerged. The volume without any liquid sealed between the liquid, Picture2impeller hub and impeller blades is occupied by the gas to be pumped away. As the impeller rotates the liquid begins to recede from the center hub serving as a piston drawing gas in, continuing with the rotation the impeller blades go deeper into the liquid ring thus impeller cells (pistons) compress the gas until discharged through the strategically placed discharge port. This action creates the liquid ring vacuum pump’s suction that draws in gasses and vapors through the inlet port. The outcome is compression. Gasses and a certain amount of liquid are exhausted through the discharge port to atmospheric or even higher pressure. Because some liquid sealant is discharged along with gases the same amount of liquid must be replenished or sent back to the pump after it has been cooled.

Getting Professional Assistance

As with all equipment, there are times when a vacuum pump needs to be serviced.

The professional team at Premier Fluid Systems is highly qualified for handling repairs and it is important to remember the Picture5team can

provide assistance with installation as well as start-ups

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کاربرد اصلی پمپ وکیوم آبی در صنایع

The versatility and ruggedness of the  ASIA VACUUM Liquid Ring Vacuum Pump makes it a wise choice in a variety of applications:

Power generation equipment
Petrochemical
Seawater deaeration
Pharmaceutical
Ground water remediation/vapor extraction
Food production
Power generation equipment
The ASIA VACUUM liquid ring vacuum pump supplied to the power industry for condenser venting is a two-stage (two impeller) design housed in a single pump body. Our unique internal spray feature ensures the maximum amount of condensing before the gas enters the vacuum pump, much like a direct contact condenser. This feature allows the pump to handle more load because condensation ahead of the pump reduces volumetric flow rate. To achieve capacity requirements, some companies utilize a spray tee ahead of the vacuum pump and air ejector to achieve the design pressure, or even attach a second stage impeller housing to a single stage pump.

All ASIA VACUUM condenser venting equipment is designed to perform per HEI (Heat Exchange Institute). At , every condenser exhauster system we sell is designed to meet the venting capacity requirements specified per HEI at 1 inch HgA.

ASIA VACUUMis the only manufacturer that designs and builds Steam Surface Condensers, Liquid Ring Vacuum Pump Venting Systems, and Liquid Ring Vacuum Pump Waterbox Priming Systems. Our unique experience and understanding of how these systems work together allow us to provide the Engineering Answers the power generation industry requires.

Petrochemical
ASIA VACUUM has been producing Liquid Ring Vacuum Pump Packages for the petrochemical industry for many years. The applications where our liquid ring vacuum pumps have been utilized are diverse. Some common processes are cumene, phenol, ethylene glycol/ethylene oxide, ethyl benzene/styrene monomer, amines and alcohols, to name a few. We are experienced at supplying vacuum pumps and systems per the requirements of API specifications such as API-681, 610 and 682. As a regular supplier of ejectors, condensers, and heat exchangers to oil refineries, ASIA VACUUM manufactures ancillary system components to the exacting standards required by the petrochemical industry. Material requirements for sour service, such as NACE MRO-175-95 are not a problem.

Combine our liquid ring vacuum pumps with our ejectors and condensers for a hybrid package designed from the ejector suction to the separator discharge, all designed, manufactured and backed by a single company. With a multitude of experience in all of the system components, combined with petrochemical process knowledge, ASIA VACUUM can design and build the right system for any application.

Seawater deaeration
Looking for the leaders in seawater deaeration vacuum equipment? ASIA VACUUM has produced hundreds of vacuum pumps and ejectors for use on oil platforms throughout the world. You can find our equipment on oil platforms in the Gulf of Mexico, the North Sea, the Persian Gulf and across Asia. At the heart of our systems is our nickel-aluminum-bronze (AB2/BS1400) vacuum pumps, for which ASIA VACUUMis the industry leader in their production.

Nickel-aluminum-bronze offers the best of both corrosion resistance to seawater and economical pricing. It is not uncommon for ASIA VACUUM nickel-aluminum-bronze pumps to be in operation 10 to 15 years or longer than 316 stainless steel pumps in this harsh environment. Often, pumps in this service are supplied with Monel shafts and Xylan coated 316 stainless steel exterior bolting. Mechanical seal selection is determined by the application requirements.

Our deaeration systems don�t stop with the vacuum pump. Systems normally consist of the vacuum pumps, atmospheric air ejectors, baseplates, separator tanks, and other ancillary equipment, such as the motors, couplings, and guards.

Ejectors are normally supplied in 316 stainless steel or Monel. Baseplates are coated in a heavy-duty epoxy consisting of a primer coat, two intermediate coats, and a polyurethane finishing coat. Separator tanks are manufactured from fiberglass-reinforced plastic.

All of our deaeration systems and individual components are designed to work efficiently together, while offering years of trouble-free service.

Pharmaceutical
For drying, laboratory, vapor recovery, house vacuum and everything in between, rely on ASIA VACUUM liquid ring pumps. ASIA VACUUM regularly supplies equipment for use in the pharmaceutical industry. Our liquid ring vacuum pumps are operating in processes the world over, drying product and recovering organic vapors. Liquid ring vacuum pumps are utilized to provide house vacuum on production lines. The choice to utilize liquid ring pumps stems from their unbeatable reliability.

Laboratories often get their vacuum from liquid ring vacuum pumps. A liquid ring vacuum pump’s ability to handle slugs of liquid and low change in temperature across the pump, make it a common choice for laboratory systems where flammable mixtures may enter. Our system has also been used on less common applications, such as sampling and weighing equipment.

Ground water remediation/vapor extraction
Soil vapor extraction systems often utilize a ASIA VACUUM oil-sealed liquid ring vacuum pump for the vacuum source when low soil transmissivity conditions exist in the contaminated area. This condition requires a much greater vacuum to achieve acceptable vapor removal.

Oil sealed liquid ring pumps have many advantages in these applications. Due to the low vapor pressure of oil, a much greater vacuum can be achieved than with positive displacement blowers or even water sealed vacuum pumps. This allows extraction from wells greater than 30 feet deep. The oil sealed vacuum pump is used in a closed loop system and does not require water for sealing or cooling. This eliminates the need for treatment of contaminated water.

The ASIA VACUUM oil sealed liquid ring vacuum pump package consists of a ASIA VACUUM liquid ring pump, a vapor/liquid discharge separator, an oil mist coalescing filter, an air cooled heat exchanger, all associated piping, and necessary accessories for remote operation. Instruments provided can be explosion-proof rated. We can even supply the oil for the system.

ASIA VACUUM Corporation has a complete line of standard oil sealed liquid ring pump packages pre-engineered for soil vapor extraction and groundwater remediation application, or we can engineer a package to meet any particular specifications.

Food production
ASIA VACUUMliquid ring vacuum pumps are commonly used in the production of food. Most of the applications in the food industry are geared toward the removal of water. Concentrating fruit juice, adjusting the boiling point (temperature) of water during cooking, and flash cooling after a food item has been cooked are all common processes where liquid ring vacuum pumps may be found. Materials of construction for these systems are normally cast iron or 316 stainless steel. Many of these systems are supplied with a pre-condenser to remove most of the condensable load upstream of the liquid ring pump. This results in a much smaller vacuum system.

ASIA VACUUM manufactures pre-condensers specifically designed to work in conjunction with our liquid ring vacuum pumps in this service. The

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result is a single source of equipment supply and guarantee that the condenser and pump are designed to properly function together.

Description of the LIQUID RING VACUUM Package Unit

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Description of the LIQUID RING VACUUM Package Unit
Compact, ready-to-connect vacuum systems have proven to be particularly advantageous for research, planning and production. All components, such as vacuum pump / compressor, liquid separator, heat exchanger, gas ejector, valves, fittings, operating and supply lines, etc. housed in a space-saving package unit are easy to operate and maintain. When using sealless vacuum pumps / compressors, these systems are hermetically sealed. The tight ring liquid circuit ensures completely leak-free operation; therefore, no operating liquid can reach either the atmosphere or the disposal facilities. Operating liquid and cooling liquid are in separate circuits to ensure that the cooling liquid is not subject to contamination by process gas components. Aggressive, toxic, foul-smelling gases and vapours can be neutralised using a suitable operating liquid in the ring liquid circuit. Condensable intake mixtures, such as solvent vapours, are condensed through the installation of condensers and immission coolers in the package unit allowing cost-saving recovery of solvent. The hermetically sealed package unit is, therefore, a modern, perfect solution to problems in modern vacuum and process technology characterised by maximum environmental friendliness and cost-effectiveness

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