B20 Series Deoiling Hydrocyclone
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Overview
Cyclotech’s B20 Series Deoiling Hydrocyclone liner represents the state of the art in PRIMARY Produced Water Treatment technology, a third generation hydrocyclone geometry optimising the critical balance between oil removal efficiency and capacity. This ensures that optimal separation is achieved in the most cost effective and space efficient manner.
The B20 Series De-oiling Hydrocyclone is used to treat water streams containing up to 5,000 mg/l oil with a requirement to meet a discharge water oil content of 30 mg/l, or more commonly stretch targets of as low as 15 mg/l. For demanding process requirements, the B20 Series has been specifically designed for use with Cyclotech’s novel
PECT-F® performance enhancement pre-coalescer and can be integrated with Cyclotech’s
DeepSweep® Compact Flotation (CFU) systems for ultimate separation performance.
The B20 Series has proved itself to be one of the most efficient Deoiling hydrocyclones available to the Oil & Gas industry, rapidly developing an enviable globally installed base on both onshore and offshore facilities.
Principle of Operation
A hydrocyclone has no moving parts and achieves liquid/liquid separation by virtue of a pressure drop across the unit. Oily water is forced under pressure into the inlet section of the liner via a tangential inlet port. This, together with narrow cyclone diameter, causes the fluid to spin at high velocity, which creates a high g radial acceleration field. Oil, the less dense liquid, is forced to the axial centre of the hydrocyclone to form a thin oil core. Through internal hydrodynamic forces and external differential pressure control, this oil core is removed counter currently via a fine reject port adjacent to the inlet while the clean water flow is discharged from the cyclone tail pipe.
The B20 Deoiling Hydrocyclone liner has an optimal high Length / Diameter Ratio to:
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maximise the acceleration field created by the spinning flow
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minimise the radial distance that a oil droplet must travle to reach the axial oil core
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maximise the residence time that the oil drop has to reach the axial oil core
Hydrocyclone Liner Design
The hydrocyclone geometry is critical to achieve optimal separation performance. Deoiling hydrocyclone designs cannot be scaled up, and so the Cyclotech B20 hydrocyclone liners are manifolded together in a common vessel to achieve the required system flowrate. The ultra slim external dimensions of the B20 Series liner has been designed to provide market leading liner packing efficiency to maximize process throughput within a given vessel diameter without compromising the separation performance.
Cyclotech B20 Deoiling Hydrocyclone liners are most commonly manufactured in Duplex Stainless Steel. For erosive applications, Cyclotech offers liners with all inlet and taper internal surfaces exposed to high fluid velocities, manufactured from a range of wear resistant materials. These materials include Stellite 6, Tungsten Carbide or Reaction Bonded Silicon Carbide, the latter an advanced ceramic that will provide a wear live of up to 10 times that of a standard Duplex liner.
High Turndown Vessel (HTD) Design
For applications requiring very high turndown, Cyclotech offers its HTD compartmentalised vessel design. Internal baffles are used to divide the vessel into either two or more separate subcompartments. Each compartment can be switched in or out of service using external valving to suit process conditions. This operation can be manual or automated. The Cyclotech HTD design has considerable benefits over traditional methods to increase turndown as it removes the need for either blanking liners or multiple vessels. In a typical installation, the Cyclotech HTD design can increase the turndown from 3:1 (a typical value for a conventionally designed vessels) to over 10:1 for a two compartment HTD vessel and over 50:1 for a three compartment HTD vessel.
New Build Systems
Cyclotech’s B20 Series Deoiling hydrocyclone systems form an integral part of our Produced Water Treatment capability. These new build systems can range from fully automated packaged systems to stand alone vessels. Standard pressure vessel designs are available at most design pressures and temperatures and to most common design codes such as PD5500, ASME VIII, AS 1210 or GOST-R. Materials of construction range from standard and low temperature carbon steels through to most stainless steels such as Duplex, 6Mo, Super Duplex, 625, 825 and other alloy steels.
B20 Series Retrofits
The capacity of existing older design hydrocyclone systems can be increased by up to 80% while improving separation performance by up to 50% by implementing a
Cyclotech B20 Series Deoiling Hydrocyclone retrofit. This can be done without the addition of extra hydrocyclone vessels and in most cases, any hot work or any modification to the existing vessels, pipework or valving. The Cyclotech B20 Series liner can be adapted to retrofit existing third party hydrocyclone vessel designs.
Hydrocyclone Spares
Cyclotech specialise in the supply of
spare like-for-like hydrocyclone liners and seal kits for all Deoiling Hydrocyclone systems. The Cyclotech B20 and B50 Series Deoiling Hydrocyclone liners can be adapted to provide a spare which will directly fit into any third party Deoiling Hydrocyclone system without the requirement for any modification to the existing vessel. Operators find the benefits include that they have access to a spare liner which has equivalent or better separation performance, equivalent or better hydraulic capacity, equivalent or better wear resistant material options and certainly better cost effectiveness. Cyclotech now have call off contracts in place with many operators to provide a single point of contact for all their hydrocyclone spares requirements where in many cases Cyclotech did not supply the original system.
Field Testing
Cyclotech has a range of
B20 Series single liner field test units (up to 900#), which can be used to determine the B20 separation performance on live fluids. These field test units are compact, require no utilities and come complete with all required valving, instrumentation and hosing. Cyclotech can also perform a full oil drop size characterisation of the existing Produced Water Treatment as part of these performance trials.
Leased Equipment
Cyclotech own a fleet of flexible, production scale (up to 50,000 bpd) skid mounted Produced Water Treatment packages available on long or short term
lease contracts. The equipment is available globally but supported at a local level which allows Cyclotech to assist the customer in the design, integration, operation and manning of these temporary systems.
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