From Vacuum Products
Graham liquid ring vacuum pumps are efficient and easy to maintain because there is only one rotating part. Our pumps are robust and can be started and stopped repeatedly, being fit to handle unexpected process upsets, including liquid in the suction, without damage. The exhaust gas stream is oil-free and low temperature. Graham Liquid Ring Pumps can be fabricated in any material to meet the requirements of the process gas. In addition to operating to very deep vacuum levels, our Liquid Ring Pumps can also operate above atmospheric pressure to provide a very wide range of operation. While liquid ring pumps typically operate with water as the service liquid, Graham Pumps can operate with any liquid that is available.
The Graham Liquid Ring Pump is a proven design, with installations throughout the world. Graham has an extensive database of actual performance test data and can provide a Liquid Ring Pump suitable for nearly any application.
Graham has been providing Engineering Answers since 1936 and can easily combine Graham Liquid Ring Pumps with other Graham equipment, including Steam Jet Ejectors and Process Condensers, to provide a highly efficient vacuum system that optimizes capital and operating costs.
Choose from a wide variety of materials to match almost any process. Standard pumps are available in cast iron, steel or stainless steel; while our COR-RESIST series is available in nickel aluminum bronze, Hastelloy, alloy 20, ni-resist, titanium, duplex stainless steel, as well as other alloys.
Graham Liquid Ring Vacuum Pumps are efficient and easy to maintain because there is only one rotating part, a multi-bladed impeller keyed to the pump shaft. The impeller is mounted eccentrically in a round pump housing. As the impeller rotates, centrifugal force throws the seal liquid against the outside wall forming a liquid ring.
Because this pump operates at low noise and vibration levels, it can be easily installed in most locations — inside or out.
Although water is the most common and readily available service liquid, the Graham Liquid Ring Pump can efficiently operate with many different fluids, such as ethylene glycol, ethylbenzene, caustic solution (NaOH), mineral oil or hydrocarbon solvents, just to name a few.
The Graham Liquid Ring Pump provides exceptional performance under all types of adverse operating conditions. It’s designed to endure varying process loads and upset conditions without damage. This includes functioning trouble free with liquid in the suction, high inlet gas temperatures or condensable loads.
Advantages of Graham Liquid Ring Vacuum Pumps
- Reliable operation
- Ease of maintenance
- Wide range of materials
- Engineered packaged systems
- Stocked vacuum pumps
- Readily available spare parts
- Single source of supply
The versatility and ruggedness of the Graham Liquid Ring Vacuum Pump makes it a wise choice in a variety of applications:
- Power generation equipment
- Seawater deaeration
- Ground water remediation/vapor extraction
- Food production
Power generation equipment
The Graham 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 Graham condenser venting equipment is designed to perform per HEI (Heat Exchange Institute). At Graham, every condenser exhauster system we sell is designed to meet the venting capacity requirements specified per HEI at 1 inch HgA.
Graham is 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.
Graham 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, Graham 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, Graham can design and build the right system for any application.
Looking for the leaders in seawater deaeration vacuum equipment? Graham 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 Graham is 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 Graham 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.
For drying, laboratory, vapor recovery, house vacuum and everything in between, rely on Graham liquid ring pumps. Graham 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 Graham 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 Graham oil sealed liquid ring vacuum pump package consists of a Graham 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.
Graham 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.
Graham liquid 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.
Graham manufactures pre-condensers specifically designed to work in conjunction with our liquid ring vacuum pumps in this service. The result is a single source of equipment supply and guarantee that the condenser and pump are designed to properly function together.