Company : Transvac Systems Ltd

Category : Oil and Gas

Key Products : Gas Ejectors, Liquid Ejectors, Liquid-Gas Ejectors, Steam Ejectors, Universal Design Ejectors

Transvac is one of the leading suppliers of Ejector solutions across the globe since 1973. As both a designer and a manufacturer of Ejectors, Transvac has full in-house control over process and mechanical design, supply of raw materials, manufacturing, scheduling and testing. All of our products are custom designed to suit the process and mechanical requirements of each application, to ensure maximum operating efficiency. We offer standard and exotic materials of construction including Hastelloy, Graphite, PTFE, Duplex, Titanium and other materials.

Ejectors, also known as Eductors or Jet Pumps, are a simple, robust technology with no moving parts and require no maintenance. They are highly efficient and often use existing available energy to run. Our Ejectors are capable of compressing gas from 0 to 150 bar in a single stage. They are extensively used in the oil and gas industry, where typical applications include boosting LP (low pressure) wells, flow assurance in long tie-backs, flare gas recovery, sand slurry pumping and produced water treatment. Other industries that utilize the simplicity of Ejector technology include water treatment, utilities, nuclear, pharmaceutical, food and steam & vacuum plants. Every Ejector is fully custom designed to a client’s exact requirements, to ensure the best performance.

Gas Ejectors

Gas Ejectors (GJEs) are used for boosting gas well production, either by entraining the low-pressure gas or via gas injection. They are also used for flare/waste gas recovery and TEG/vent gas recovery. We are one of the leading gas Ejector manufacturers in the industry. Our gas Ejectors can offer compressions of up to 7:1 in a single stage. This can be further boosted with the use of a secondary Ejector. Gas Ejectors offer an attractive solution for generating extra production from LP wells and, in the process, extending field life.

For example, gas from a HP (high pressure) well is sometimes choked to a lower pressure to meet downstream process conditions. Wasting ‘usable’ energy in this way offers no added value to production. Instead, the HP gas can be used to ‘drive’ an Ejector, which not only delivers the HP gas at a suitable lower pressure to meet downstream conditions, but also lowers the back-pressure on the nearby LP wells, bringing them back to life.

Liquid Ejectors

Liquid Ejectors use a high pressure liquid motive to entrain, mix or dilute a secondary liquid. In operation, a high velocity jet of pressurised liquid is discharged from the motive nozzle and produces a region of low pressure in the suction chamber that entrains the secondary liquid or fluidised solids. The resulting mixture flows through the diverging cone to regain some pressure in order to overcome system discharge heads, and the two streams then thoroughly mix. Liquid Jet Pumps can also entrain solids that have been fluidised to enable smooth flow.

Typical applications of liquid Ejectors include:

  • Chemical Dosing
  • Ion Exchange Resins
  • Sand Cleaning

Single units or complete skid mounted packaged systems are available; each unit is designed to specific process conditions. Standard materials of construction include rubber-lined, PVCu, PP, PTFE, PVFD, hastelloy, titanium, stainless steel and carbon steel. Connections include flanged, screwed, plain, hosetail, bauer and quick-release.

Liquid-Gas Ejectors

Liquid gas Ejectors use the power of high pressure liquid to entrain a gas. Transvac liquid-gas ejectors, known as Liquid Jet Compressors, can accurately entrain and mix air or gas in-line, and discharge against a back pressure, using liquid as the motive force. Our company’s Liquid-Gas Ejectors have readily been used for entraining ozone and atmospheric air in water treatment applications, but are now being developed by our dedicated Research & Development team for use in Oil & Gas applications.

Liquid gas Ejectors have a compression ratio of up to 150:1 as they use high pressure liquid to entrain flare or waste gas. Typically, injection water or produced water is employed to motivate the Ejector, thus making use of existing facilities, perfect for brownfield developments. The Ejector can entrain and compress gas from a number of sources including a separator, manifold or individual well. The resultant reduction of backpressure on the upstream process delivers a boost to production and promotes steady flow, even where liquid loading is an issue, particularly in long tiebacks.

Steam Ejectors

Steam Ejectors offer various advantages when compared with other vacuum producing systems. They also utilize motive steam that is already available on site and would be otherwise wasted. We design a range of steam Ejectors including Thermocompressors, vacuum Ejectors, Desuperheaters, Hogging Ejectors, combination systems, atmospheric air Ejectors and Condensers.

Indirect or surface contact condensers (shell & tube or plate type) are used when the Ejector fluid and cooling medium must be kept separate, whereas direct contact condensers (ring & disc or spray type) are used when complete mixing is acceptable. We offer a complete range of fully instrumented low level skid mounted systems, versatile in handling both wet and dry loads. Systems are available with one, two or three stages of steam Ejectors, combined with a single or two stage Liquid Ring Vacuum Pump. The Liquid Ring Pump is very effective at rapidly producing a coarse vacuum and the Steam Ejectors are used to create higher vacuum levels.

Universal Design Ejectors

Universal Design Ejectors comprise of an external pressure retaining shell, into which are fitted two replaceable components that give the Ejector its operating characteristics. These two components are called the nozzle and the diffuser and in our Uuniversal Design Ejectors, they can be easily changed-out with different ones to give the Ejector different optimum operating characteristics.

Thus, as well conditions change over time (or flaring conditions for gas recovery applications), the internals can be replaced with new ones which are more suited to the changed conditions. By changing-out the internals at recommended intervals, high performance efficiency can be maintained over the lifetime of the unit, thereby maximizing gas recovery from the LP wells and from the field, or maintaining optimum gas recovery for flare gas recovery applications.

Contact Details

Transvac Systems Ltd
Monsal House,
1 Bramble Way,
Alfreton, Derbyshire,
DE55 4RH,
Tel: +44 (0) 1773 831 100

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