Data Sheet | TC9814-015

NATCO® Dual Frequency® ElectrostaticsDual Frequency Electrostatics provides process improvements approaching 100% over existing mainstream technology

PROCESS SYSTEMS

BENEFITS OF DUAL FREQUENCY ELECTROSTATICS

1. Increased oil flowrate through an existing

vessel

2. Lower outlet BS&W

3. Reduced deckspace and vessel footprint at an

equivalent outlet BS&W

4. Lower operating costs

• Enables reduction in chemicals consumption

• Allows for lower operating temperature

5. Balanced three-phase transformer

6. Cleaner effluent water, less floc

0.5

0.4

0.3

0.2

0.1

00 20 40 60 80 100 120

Existing M

ainstream Te

chnology

Dual Frequency

Flowrate, KBPDExample:• 65,000 BOPD• 27º API Crude• Inlet - 8% BS&W• Outlet - 0.5% BS&W

Out

let

BS&

W o

f Oil

Phas

e

DUAL FREQUENCY RESULTS

Dual Frequency

10’ x 45’

CurrentState-of-the-Art

Technology

12’ x 60’

Conventional A/C

Technology

14’ x 65’

Typical Size Reduction with NATCO Dual Frequency

The patented NATCO Dual Frequency electrostatic

technology utilizes a proprietary process controller, Load

Responsive Controller (LRC-II®), and three-phase power

unit to produce a customized electrostatic field that can

be readily optimized for any crude oil. The technology

provides process improvements approaching 100% over

existing mainstream electrostatic technology.

Since 1971 the NATCO Dual Polarity® electrostatic process

has been used to dehydrate and desalt the world’s crude

oil. Now, the patented NATCO Dual Frequency process

continues Cameron’s legacy of leadership in electrostatic

technology.

Three primary components are packaged in a single oil-

filled enclosure. First is the power electronics designed to

operate on three-phase, 480 volt (50/60 Hz) to produce a

variable amplitude and variable frequency voltage supply.

For many field installations, this is a key feature of the

technology, as it enables an optimization of the voltage

profile. Second, the medium frequency transformer

provides for the increased secondary voltage known to

promote effective coalescence. Third, the secondary voltage

is rectified so that polarized voltages can be applied to the

electrodes to create the benefits of both AC and DC fields

within the treater. These benefits have been proven in over

30 years of field experience with our NATCO Dual Polarity

technology.

O I L

© 2010 Cameron | NATCO, LRC-II, Dual Frequency and Dual Polarity are registered trademarks of Cameron | Printed in USA, 1M | 07/10 TC9814-015

PROCESS SYSTEMS

As with NATCO Dual Polarity, a DC field

is created between the electrodes in the

NATCO Dual Frequency coalescer, enabling

droplet motion and efficient coalescence.

Simultaneously, an AC field is created between

the electrodes and the ground, enabling

maximum droplet excitation, contact and

droplet growth.

Traditional electrostatic technologies in wet

crude oils typically exhibit rapid voltage decay

or arcing. This decay reduces the effectiveness

of the dehydration process by pulling the

voltage lower than that required for effective

dehydration.

By operating with an increased frequency,

the NATCO Dual Frequency controller reduces

this voltage decay and enables effective

dehydration. Utilizing a medium frequency

power unit overcomes the voltage decay

associated with conventional 50/60 Hz

transformers.

Treatment chemicals, temperature and

the specific oil-water properties of the oil all

combine to create a unique emulsion that

often can be very difficult to resolve. To break

the emulsion, the patented NATCO Dual

Frequency system utilizes a microprocessor-

based system (consisting of a NATCO panel

PC and LRC-II controller) that defines the

pattern and magnitude of the voltages that

are applied to the electrodes. The proprietary

LRC-II controller allows selection of the shape

and magnitude of the voltage waveform to

achieve the coalescing “sweet spot” for that

crude leading to effective and rapid droplet

coalescence.

LOCATIONS

United States of America

11210 Equity Dr., Suite 100

Houston, TX 77041 USA

TEL +713.849.7500

United Kingdom

Cameron House

61-73 Staines Road West

Sunbury-on-Thames

Middlesex, UK TW16 7AH

TEL +44.1932.732000

Singapore

2 Gul Circle (Gate 2)

Jurong, Singapore 629560

TEL +65.6861.3355

OTHER LOCATIONS

Abu Dhabi

Australia

Brazil

Calgary

Colombia

France

Japan

Mexico

Saudi Arabia

Russia

www.c-a-m.com